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166

This document applies to the inward site inspection, installation and inspection methods to be adopted for the underground drainage piping system. The work methods are summarized as follows:

Mandatory Equipment Required

  • Measuring tape and setting out markers
  • Electric drill hammer
  • Hack saw cutter
  • Pipe Fitters tool box
  • Certified mobile scaffolds/step ladder
  • uPVC pipes, fittings & accessories

Preparatory Installation Requirements

Prior to installation of drainage and vent piping  works, the supervisor and foreman will verify and ensure that all the safety requirements have been complied with and are in place. The supervisor will verify that all relevant approved latest revisions of shop drawings, technical submittals, inspection  and test plans are in the work place for installation reference. This also includes installation procedures.

The supervisor and foreman will inspect all the materials delivered to the work place and ensure that these are the required materials and also for damage or defect. Materials  found not to be as per requirement  or with  damage or defect  will be set aside. These will be properly  labeled and returned to the warehouse. These will also be reported in a Non-Conformance Report to the QA/QC Engineer.

Storage of pipes should be kept on a flat surface or on level ground free from stones and sharp objects. The maximum stack should be 7 layers high as per normal condition and 6 layers high in hot condition. Ideally a stack should contain pipes of the same diameter. If this is not  possible nesting of the smaller pipes may be done. The large diameter pipes should always be kept at the bottom of the stack. All pipes stored in the  stockyard  to  be covered  with  canvass to  avoid direct  exposure  of  pipes to sunlight/UV rays.

The supervisor and foreman will orient and familiarize all the plumbers and labors involved in the installations  regarding the relevant approved shop drawings, technical submittals, installation procedures and details, acceptance criteria and safety requirements.

The supervisor and foreman will examine surfaces to receive drainage and vent pipe works for compliance with installation tolerances and other required conditions, as described in the installation requirement. Installation will not proceed until unsatisfactory conditions have been corrected.

All installation I Construction I Testing works shall be carried out in compliance with the contract specification and project safety manual.

Installation of Underground Drainage Piping

Determine the position of the pipe as per approved shop drawing. Drainage pipe invert level, less pipe  thickness of 3mm  to be marked out along the route  of the pipe at intervals not exceeding 6 meters and at every branches, changes in direction together with positions of floor drains and drain points.underground-drainage-piping-installation-method-of-statement

Positions of the floor drains, clean-outs, vents, and drain points to be clearly marked and identified by way of marker posts from main contractor’s surveyor reference provided on site.

Each drain run prior to installation will be marked out with string between points of changes in direction and held tight to prevent sagging. This line will be on the crown of the pipe or if not possible to one side and will allow the pipe to be installed in a straight line to the correct slope. For pipes extending from CB to CB, forms should be constructed and secured with provision of openings for pipes with the elevations indicated on the drawings. The installation may proceed when the pipe routes have been set out.

Measure length of drainage pipe required and cut to suit ensuring a square cut. De-burr pipe and chamfer ends. An allowance of 12mm for expansion to be made for each joint of pipe run. Lay pipes in aligned with the marker strings.

Jointing of all fittings and straight Coupling

Measure depth of the socket and mark with pencil on spigot end of pipe. Lubricate spigot end of pipe with the approved manufacturer’s lubricant. Push spigot end of pipe into uPVC ring socket to full depth,ensuring that the ring seal is in place correctly  and then  pull back by a distance of 12mm to allow for expansion. Repeat procedure along length of pipe and all branch drains.

At the head of each drain branch, ensure that the floor drain or drain point is level with the marker port reference and that the fitting is square. On completion  of each drain  section, check and adjust if necessary to ensure that the pipe is in line with the marker string and all inverts are correct.

Pipe Casted in the Concrete

For pipe  work  that  will  be cast  within  the  concrete  slab, the  pipe is  to be restrained and supported by bent rebar rods with tie wires fixed around the pipe to prevent movement during testing and pouring concrete.

During concrete pour, minimum one supervisor from Main Contractor & MEP Contractor to be present to supervise the work. Proper care should be taken to avoid contact from  the mechanical vibrator to the pipe to avoid pipe breakage. In event of pipe damage during casting that particular section of pipe will be removed immediately and replaced and water will be filled to check for any leaks. Casting will proceed to other areas till the pipe has been rectified.

Pipes shall be laid to uniform slope as per approved shop drawing  &  Standards. All  of  manhole  entry  and  exits pipes to be provided with wall protection sleeves. All pipe open ends to be covered with temporary fabricated end caps.

Inspection & Testing Requirements

All  works  shall  be  inspected  for  quality  workmanship  and  conformance  to specification prior to offering for inspection. Notice of inspection shall be advised to the consultant for their discretionary attendance and witnessing. Notice shall be advised at least 24 hours prior to date of inspection. Water test is conducted to ensure and prove the tightness of the joints and ensure there are no leaks in the piping system.

The Water pressure test can be applied to the system in it’s entirety or in sections. All openings in the piping will be tightly closed by end caps/plugs or by suitable means and the system filled with water to the point of overflow from the highest point. At both the end of the pipe section to be tested the pipe will be upright vent. The plugs will be opened temporarily to make sure that all air has been vented and that water has reached all parts of the system.

No section of the system shall be tested to less than 1.5 meter Head of water. In testing successive section of the piping,at least the upper 3 meter of the next proceeding section will be tested. Except the uppermost 3 meter,the whole system shall have been subjected to a height of not less than 1.5 meter Head of water. The water shall be kept in the system or in the portion  under test for at least 4 hours during inspection. The water level will be marked on the pipe at the start and before the end of the test.

While the system is under test, a careful inspection shall be made on all the pipes and joints. If any leaks in joints or evidence of defective fittings or pipe is revealed the defective fittings/ pipe shall be replaced with new. After rectification the test will be carried out for minimum of 4 hrs.

Testing will be witnessed by consultant to their satisfaction and documentation will be maintained. Only after approval of testing,the pipe would be allowed to cast within the raft slab. Do not  drain the pipes until  the  concrete is poured. The weight of water counter-weights the floating of the pipes. Temporarily seal the pipe opening using plastic or wooden disc with  packing tapes to avoid ingress of debris.

Checking the Slope of Drainage Pipe

Select the spirit level that will rest against the drainage pipe you are measuring without contacting fittings or other obstacles. The level must rest only on the pipe. Invert level to be as per approved shop drawing.

Set the spirit level on the top of the pipe or hold it against the bottom. Note the position of the spirit level’s bubble, it should not be centered. Lift the end of the spirit level until the bubble is centered.

Measured the distance between the end of the spirit level and the pipe. The distance is the slope of the  pipe  along the length of the spirit level. The standard slope for most soil and waste pipe is 1 percent downward in direction of flow. Verify  the slope is in  the correct  direction.  The pipe  must  slope  downward from the source of the water or waste toward the main sewer or catch basin.

181

In order to do the honeycomb concrete repair work for structural element all necessary machines and tools shall be arranged like mixer machine, wheelbarrows, wire brush, angle grinder, measuring tapes, and other handy tools.

Below is the repairing material for reference purpose, it can be any suitable equivalent local materials as per the locality of the project / building. All material shall be properly stored as per manufacturer instructions.

  • Sika MonoTop – 610MY
  • Sika MonoTop – R
  • Sika Grout 215

All health and safety procedures and regulations shall be complied. Also it is important to provide proper and safe access for inspection and working activities. Site personnel must be in proper safety working attire e.g. Safety boots and helmets must be worn at all times. Proper and adequate lighting to be provided when working at night. In order to ensure the quality of honeycomb concrete repair works meet the requirement, inspection and test shall be carried out as per the Project Quality Plan (PQP).

Concrete Repair Method No. 1 – Re-cast Concrete Structure

1.1 Identify and demarcate the member which need to be demolished.

1.2 Erect adequate temporary props to support the affected slab and beam.

1.3 Demolish the severe concrete structure by means hacking with pneumatic tools. Ensure the edge of the concrete is clean, sound and free from dirt or dust.

1.4 Care should be taken not to damage the existing reinforcement of the beam and slab.

1.5 Bonding Preparation – Apply one coat of bonding agent Sika Monotop – 610MY at the edge of existing concrete to receive new concrete.

1.6 Formwork – Erect formworks at the demolished area and secure the formwork with suitable ties.

1.7 Request for inspection as per inspection checklist for concreting

1.8 Pour ready-mixed concrete Grade 40 with waterproofing admixture to the prepared formwork. Ensure the concrete have sufficient vibration during concreting.

1.9 On completion carryout joint inspection to sign on inspection checklist for post concrete.

Method 2 for Concrete Repair- Formwork Grouting

2.1 Based on structural repair layout, mark on existing structure such as concrete honeycomb.

2.2 Surface Preparation – Cut and hack around at demarcated honeycomb area with suitable tool and equipment.  Ensure all loose concrete must be removed down to sound concrete. (Note: Do not use an impact hammer greater than 15 pound)

2.3 Clean existing reinforcement and clean/remove debris or loose concrete fragment from the rectification area.

2.4 Request for inspection as per inspection checklist for concrete repair.honeycomb concrete repair method

2.5 Formwork –Install form works that cover the size of the repair area including place a layer of sponge at the perimeter with suitable tied.

2.6 Install Inlet And Outlet – Drill two rows (upper and lower part) of 25mmØ holes on the formwork to insert 25mmØ UPVC pipe with spacing of 600mm c/c.

2.7 Mix the pre-bagged polymer modified shrinkage compensated high strength grout – Sika Grout with adequate water in a mixing drum. 6mm to 10mm aggregate shall be added and mixed with the grout at a ratio of 1:1 by weight to minimize heat generation.

2.8 The Sika Grout 215 concrete grout is then poured into the pump. Pump the grout into the form work with the lowers injection port until the grout is going out from the upper port.

2.9 Curing – Leave the formwork in place for at least 24 hour. Upon removal of the formwork, cure the exposed surfaces immediately with water.

2.10 On completion carryout joint inspection to sign on inspection checklist for concrete repair.

Method 3 for Concrete Repair- Formwork Grouting for honeycomb depth > 20mm

3.1 Based on structural repair layout, mark on existing structure such as concrete honeycomb.

3.2 Surface Preparation – Cut and hack around at demarcated honeycomb area with suitable tool and equipment.  Ensure all loose concrete must be removed down to sound concrete. (Note: Do not use an impact hammer greater than 15 pound)

3.3 Clean existing reinforcement  and clean/remove debris or loose concrete fragment from the rectification area.

3.4 Request for inspection as per inspection checklist for concrete repair.

3.5 Formwork –Install formworks that cover the size of the repair area including place a layer of sponge at the perimeter with suitable tied.

3.6 Install Inlet And Outlet – Drill two rows (upper and lower part) of 25mmØ holes on the formwork to insert 25mmØ UPVC pipe with spacing of 600mm c/c.

3.7 Flowable Sika Grout 215 – Place about 4.0 to 4.4 litres clean water into clean container; add the whole bag of Sika Grout 215 (25kg) while continuously mixing. After mixing, stir lightly with a spatula for few seconds to release any entrapped air.

3.8 The Sika Grout 215 concrete grout is then poured into the pump. Pump the grout into the form work with the lowers injection port until the grout is going out from the upper port.

3.9 Curing – Leave the formwork in place for at least 24 hour. Upon removal of the formwork, cure the exposed surfaces immediately with water.

3.10 On completion carryout joint inspection to sign on inspection checklist for concrete repair.

Method 4 for Concrete Hand Patch Repair (for area < 0.5m2 at depth < 20mm)

4.1 Based on structural layout, mark on existing structure such as concrete honeycomb.

4.2 Cut around demarcated honeycomb area to eliminate feather edge.

4.3 Surface Preparation – Repair area shall be clean, sound and free from all loosely adhering particles.

4.4 Bonding Preparation – Apply one coat of bonding agent Sika Monotop – 610MY “wet on wet” to the rectify area.

4.5 Request for inspection as per inspection checklist for concrete repair.

4.6 Concrete Mixing – The cement mortar Sika Monotop – R should be mixed in a clean drum. Place 3.4-3.5 liters of water in to the drum and add Sika Monotop – R slowly while mixing.

4.7 Application – Work wet on wet the mixed mortar well into the rectify substrate, using a placing suitable tools, compact well. Steel trowel the final coat if required.

4.8 On completion carryout joint inspection to sign on inspection checklist for concrete repair.

120

Safe Work Method Statements – SWMS

What is a SWMS?

SWMS is document detailing how a particular task or activity will be carried out, including required resources, responsibilities, quality and HSE requirements etc.

What is the purpose of SWMS?

  • To outline a correct, systematic and safe method of work for the particular task or activity
  • To provide an induction document that workers must read/understand before starting a task to meet legal
    compliance, hazard identification and control
  • To help plan for the task ahead of time
  • To provide the Supervisor with a procedure for completing the work

Where does SWMS Sits in the hierarchy of the construction site?

  • SWMS is part of a company or project Quality Plan, that will include a list of required method statements for the Project. The SWMS will be produced as site specific to cover the required task.
  • SWMS requires the approval of Consultant.
  • SWMS is part of the Application For Work (AFW) for consultants and contractors.
  • It is the document that must be submitted to detail how the work will be carried out, and attached to the Safety Document when issued to ensure it is at site.
  • The Competent Person under must understand the SWMS and ensure this is communicated through toolbox talks (TBT) and implemented for their task and working party

Why do Client asks for SWMS to be completed?

  • To ensure the Contractor can demonstrate experience and knowledge of what they will be doing during the project.
  • To ensure the Contractor has considered the work, the environment and the people for the task.
  • To ensure a safe system of work is employed to protect workers/assets/environment from the known
    hazards
  • To ensure emergency procedures are in place in the event of something going wrong.

When do You need a Work Method Statement?

As a standard practice you need safe work method statement during construction works,. While there is no absolute guidance as when a SWMS must be prepared, it would be in the interest of the Main Contractors to always err on the side of caution and produce a SWMS for all activities. There must be documented SWMS for the critical activity like working at height, excavation etc.

Clearly, due to the nature of construction many activities will be intertwined such as working at height and painting
for example. Main Contractors will be required to combine SWMS for specific works.

SWMS Roof Steel Truss Installation

When should a Work Method Statement be reviewed or changed?

SWMS should be constantly under review by the Supervisor/Engineer in charge. As sites change, as workers change, the Supervisor should be observing and reviewing the changes with regards to the SWMS. Formal review must take place when major changes or new hazards are introduced to the environment, working practice, and or resources. As an example a formal change would be required when changing working at height from scaffolding to working from a mobile elevated work platform. Normal approval procedures would apply for making changes in the documents.

Can I use a generic Work Method Statement?

Generic SWMS are always a good place to start when completing a specific SWMS, however, SWMS must be site specific because the surrounding environment and resources are always different from site to site. This is applicable to 99% of the work activities. Generic SWMS would only be acceptable where the working environment was constant, but this is very rare. Generic SWMS should be reviewed every 6 months just to make sure it is still current.

Top Ten Tips (TTT) to complete a good SWMS

The TTT listed below is a quick reference and can be used as the starting point or at the end, as a checklist to review the SWMS against.

  1. Keep the SWMS simple. Don’t make it complicated.
  2. Use plain English, consider the reader, your message will be clearer.
  3. Make it site specific, know the location, visit the site, gather information.
  4. Consult with experts in the work/activity
  5. Don’t write the SWMS in isolation. Involve all the parties, seek feedback, add check points, pause points for verification/validation through the work process.
  6. Don’t just copy and paste, and especially from any standards and specifications.
  7. Check to see if any similar SWMS has been done before.
  8. Check for lessons that have been learnt from previous work and include them, where appropriate.
  9. Identify obstacles/issues early and plan, elimination or mitigation actions.
  10. Use pictures or diagrams as much as you can.

The benefits of a good SWMS that has been implemented to an adequate level on site.

  • The risk of harm to employees/environment/assets/customers is reduced, also protecting reputations.
  • Time and costs are saved through not having to stop work because of incidents/errors.
  • By planning ahead, obstacles can be planned out or mitigation action taken reducing delays and costs.
  • It delivers a proactive culture to planning ahead.
  • Employees will be trained and communicated with, making them feel more involved and motivated.

What should you consider when writing SWMS?

When sitting down to write a SWMS there are many items to consider that will impact the work and therefore the
SWMS. Persons responsible for SWMS construction need to ensure that they have considered the items that are
appropriate to the current site and proposed work activity sequence. When they are updating an existing generic
SWMS to make it site specific, they should also consider the following subjects:-

  • Scope of Work, the particular hazards and required control measures
  • Working systems to be used, how complex is the task
  • Arrangements for access and egress
  • Methods for safeguarding existing structures and systems
  • Structural stability precautions
  • Protecting workers, members of the public, assets and the environment.
  • Plant & equipment to be used.
  • Health protection arrangements
  • Potential emergency situations, including pollution prevention
  • Segregation of specific areas
  • Control of noise, etc

SWMS may also include

  • Client requirements
  • Enforcement authorities
  • The Police
  • Civil Defence
  • Environment Agency

Persons responsible for completing WMS, the more they complete, the greater their competence in SWMS construction. It is up to the Main Contractor or Subcontractor to ensure that the persons responsible for SWMS completion have the adequate training/experience to deliver competent and adequate SWMS.

176

Following tools shall be arranged before start of the Chasing Work on Block Wall for PVC Conduits. Necessary measures will be taken for the safety of the equipment and any other works affected by the works subject of this document.

  • Mason Trowel
  • Wheel Barrow
  • Plumb
  • Joint Filler
  • Mortar mixer
  • Mechanical Cutter
  • Chisel
  • Hammer
  • Plaster mesh
  • Dust Mask / Respirator

Relevant entities which might require protection include any such works in the vicinity of the area of work or on the service access or discharge path. The construction team will ensure that any such requirements are documented. Protection of adjacent equipment’s or assets should be done to protect them from any dust or debris. Workers must wear necessary safety gear in order to prevent any injury from use of tools and from the dust generated during cutting/chasing process.

General Requirements for Chasing the Walls

  • Chase cut-outs should always be vertical or horizontal between start and finish on the wall – never cut a chase at an angle between these two, nor step the channel.
  • Vertical chases should be no deeper  than one third of the wall thickness
  • Horizontal chases should be no deeper than one sixth of the wall thickness
  • Chases on opposite sides of a wall should not be in line, i.e. ‘back to back’.

Procedure of Chasing The Wall

  • Location of conduits to be marked as per the approved drawings and MEP requirements.
  • Block wall shall be cut by grinder a per the marking  and required depth to be attained by chisel with hammer.
  • After finishing the cutting on block wall , more chipped hollow blocks area shall be refilled by mortar prior to fix the conduits.
  • After the installation of conduits , the remained area shall be filled by cement mortar.
  • Plaster mesh shall be fixed in vertical direction for avoiding the cracks.
  • Plaster mesh to be overlapped minimum 5cm from the edge of cutting.
  • Plaster mesh shall be covered by cement mortar prior to start Rush coat/plastering.
  • The work area shall be maintained neat and tidy as reasonable practical at all times.

156

Below is the method for the installation of GRP Fins. Before starting the installation work for GRP fins following equipment/tools shall be arranged:

  • Tower crane
  • chain block
  • spanners
  • hammers
  • Hilti Machine
  • Spirit level
  • Water level

Steps for GRP Fins Installation

  1. Scaffolding should be provided in the area where fins are to be erected.
  2. Starting point reference shall be in co-ordination with the main contractor
  3. For fixing the bracket drilling to be done on the wall.
  4. For Drilling , Hilti machine shall be used .
  5. Hole dia and depth of the hole shall be as per the details given in Hilti procedure list M 24 bolts.
  6. The drilled hole shall be cleaned by the blower and brush, then adhesive capsule shall be inserted followed by the hilti bolt using proper tool and machine.
  7. Now the bracket shall be fixed on one bolts which are already cured. Checking and alignment can be done to achieve required dimension. Once the dimensions are achieved. All the remaining holes marking can be done as per the bracket holes.
  8. Once the marking is completed, remove the bracket and drill the remaining holes.
  9. Once the hilti bolts are cured insert the bracket and fastened it with nuts.
  10. Apply same procedure for other brackets.
  11. Now once the two brackets are fixed it is the time to fix the fins, to lift the fin tower crane shall be used.
  12. The fins are properly anchored with the webbing sling and lifted with webbing sling.
  13. Care must be taken so that there is no damage to the fins.
  14. Once the fins are lifted and aligned with the bracket, fasten the fins with  nuts and bolts.
  15. Re check the position of the fins as per the approved drawing.
  16. Minor adjustment and alignment can be done using shims.
  17. Check for any damages during the erection. It can be rectified using same GRP material at the site.

290

This document describes the methodology for the application of epoxy paint for the project, and to ensure that all concerned persons are familiar with the sequence of activities, utilization of resources, and execution of the works in compliance with applicable safety and quality procedures, and project documents and specification.

Necessary measures will be taken for the safety of the equipment and any other works affected by the works subject of this document.

Relevant entities which might require protection include any such works in the vicinity of the area of work or on the service access or discharge path. The construction team will ensure that any such requirements are documented.

Surface PreparationEpoxy Paint Application

The concrete substrate must be dry, sound, clean, dry and free from dust, oil, grease and laitance and other contaminants.

Molding compounds and release agents must be removed from the surface.

Substrate to be cleaned using encapsulated abrasive blasting method, diamond grinding, high pressure water jetting or acid etching.

Touch Up Floor Putty (for repair)

Using floor putty fill in blow holes which is apparent in the substrate. All cracks should by ground out back to the sound substrate using a suitable tool and after thorough cleaning to remove all dust and other impurities followed by filling using floor putty.

The excessive floor putty should remove ensuring that it falls level with the substrate. Leave to cure/dry for 24hrs prior to applying the epoxy paint.

Application of Primer Coat

After the surface preparation is complete all dust should be removed by vacuum ensuring that all dust is removed from the substrate.

Thoroughly mix the base and curing agent of Chemiguard Epoxy Sealer in accordance with the product technical data sheet using a mechanical stirrer for 2 to 3 minutes.

Chemiguard epoxy sealer can be thinned up to a maximum of 50% using Epoxy Thinner. Leave to stand (induction time) for 10 minutes before applying to the substrate. Apply Chemiguard Epoxy Sealer uniformly by using spray, roller or brush to achieve the required dry film thickness. Leave to cure/dry for 8hrs prior to applying next coat.

The primer must be tack free before top coating. If pin holes or porosities are evident after initial cure of primer, re-priming may be necessary especially on very porous concrete.

Application of First Coat of Epoxy Flooring

Thoroughly mix the base and catalyst separately, then mixed together thoroughly in accordance with the product technical data sheet using a mechanical stirrer for at least 6 minutes.

Chemiguard Epoxy Flooring can be thinned up to maximum of 15% using Epoxy Thinner. Apply first coat of Chemiguard Epoxy Flooring uniformly by using spray, roller or brush to give a uniform film thickness as required. Leave to cure/dry 12hrs prior to applying final coat. Apply final coat of Chemical Epoxy Flooring as mentioned above. Allow to dry fully.

 

103

This method statement is intended to outline the activities and the methods used for floating floor system for equipment’s like chillers etc. All activities will be carried out in accordance with the contract details and in full compliance to the Contract Specifications and Documents.

All work within the rights-of-way of the local municipal governments will be done in compliance with requirements issued by those agencies. Following tools shall be arranged before starting the floating floor slab work.

  • Measuring Tape
  • Cutting Blades
  • Heavy Duty Scissors
  • Hand Gloves
  • Perimeter Isolation Board ( PIB)
  • Low Density Fiber Glass
  • Kinetics Pad
  • Marine Plywood 18mm thick
  • Junction plate
  • Polyethylene sheet
  • First Aid Kit

Preparatory Activities

Ensure water proofing is provided. It has to be carried out as per the approved shop drawing and terminated in the up-stand. MEP clearance shall be obtained prior to start the work. Make sure that mock up is accepted by consultant.

Floating Floor System method of installation

Floating Foundation Installation

Fix the 20mm thick perimeter isolation board on concrete up-stand all around the proposed floating foundation. PIB tear must be on top with tear slot facing towards floor to be poured.

Roll out the rim, cutting the low density fiber glass to the required length and to match foundation dimensions.

Lay 18mm marine plywood on top of rim materials, staggering the joints and securing together using junction plates spaced at 600mm as shown in the approved details.

Cover the plywood with two layers of polyethylene 1000ga. Overlap seams minimum of 150mm, extend polyethylene sheet up and staple to the up-stand.

Place the required reinforcement as per the approved method statement and pour the floating slab as per approved procedure and project specifications.

After concrete has cured, removed PIB tear strip and excess polyethylene sheet at slab perimeter. Fill slab perimeter using the bitumastic sealant as per manufacturer’s instruction.

 

231

Tower Crane Erection Sequence

In the process of starting assembling lifting technician has to make sure that all lifting points are respected according to the manufacturer’s guideline, assembly sequence is clearly communicated by the lifting engineer to his crew.

The site satisfies all requirements that are routed by the relevant safety standard and have passed examination of the relevant inspection organizations and obtain permission from them. Power supply ,lighting, hoisting device and other necessary tools are available at site before commencing the assembling.

Ensure the tower crane foundation for correctness and check the measurements as per specifications. Competent surveyor to carry out the correct coordinate and verticality before pouring concrete.

Assemble the base mast section. Climbing cage and other mast section. Assemble the Pivot Head assembly. Assemble the cabin mast. Assemble the Strut Tower assembly.

Assemble the counter jib and make tie bar connections and place the 1 no. counter weight. Assemble the front Boon and lift the boom with Mobile Crane and connect to the Tower and connect all tie bars. Load the remaining 3 nos.counter weights. Fix the complete Hoisting mechanism. Set the limit switch of rotation to ensure safe operation  of the jibs as per site requirement.

All lifting gears and accessories shall have valid approved third arty certificates. Anemometers shall be fixed at least one tower crane at site to monitor the wind speed .All lifting activities shall be ceased once wind reaches 12m/s. Third party competency inspection and certification shall be carried out before handing over to site for further utilization.

Tower Crane Dismantling Sequence

Hook block will be removed and hoist rope will be reeved back on Hoist Drum. Required mobile crane will be used to dismantling the rear counter weights from the tower crane. Except last one which will be dismantled after removing of front Jib.

Mobile crane will be used to dismantling the front Boom. Hoisting Mechanism shall be removed with the help of mobile crane after removing of last counter weight left. Counter Jib shall be removed by same mobile crane.

Mobile to dismantle the Tower Head and Cabin. Use the mobile crane to dismantle the pivot head. Mast sections will be removed one by one and then climbing cage . The foundation section to be cut by oxy acetylene gas.

 

This document describes the methodology for the Installation of Irrigation pump for the project building to ensure that all concerned persons are familiar with the sequence of activities, utilization of resources, and execution of the works in compliance with applicable Safety and Quality Procedures, and Project Documents and Specification.

This method statement is intended to outline the activities and the methods used for the Installation of Irrigation pump.

All activities will be carried out in accordance with the contract details and in full compliance to the Contract Specifications and Documents.

All work within the rights-of-way of the local municipal governments will be done in compliance with requirements issued by those agencies.

Mechanical Installation

The pump shall be installed onto the concrete foundation or equivalent metal structure. If the transmission of vibrations can be disturbing, provide vibration-damping supports between the pump and foundation.

Remove the plugs covering the ports. Align the pump and piping flanges on both side of the pump. Fasten the piping with bolts to the pump; do not force the piping into place. Anchor the pump securely with bolts to the concrete foundation or metal structure.

Irrigation Pump installation method

Electrical Installation

To facilitate the connection, the motor can be rotated to obtain the most convenient position for the connection. Remove the four bolts that attach the motor to the pump. Rotate the motor to the desired position. Do not remove the coupling between the motor shaft and pump shaft. Replace the four bolts and tighten them.Remove the screw of the terminal box cover.

Connect and fasten the power cable according to the applicable wiring diagram. The diagram is available on the back of the terminal box. Connect the earth (ground) lead. Make sure that the earth (ground) lead is longer than the phase leads. Connect the phase leads. Replace the terminal box cover.

Safe Work Requirements

Necessary measures will be taken for the safety of the equipment and any other works affected by the works subject of this document. Relevant entities which might require protection include any such works in the vicinity of the area of work or on the service access or discharge path. The construction team will ensure that any such requirements are documented. The hazards identified will be controlled under the overall Project Safety Plan which is a separate document communicated to all parties on the project.

Before commencing any works, all employees will attend a site safety induction training to ensure all safety measures are understood and implemented and to cover specific procedures in case of emergency. If necessary, practical training exercises will be conducted on escape routes, signage, evacuation and rescue.

Prior to the commencement of work, arrangements will be made for medical facilities and medical personnel to be available from prompt attention to the injured person. The contractor’s vehicle assigned to the job site will be used for transporting the injured person to the first aid station and to the nearest hospital when required.

Prior to acceptance and initial operation, all piping installations shall be inspected and pressure tested to determine that the materials, design, fabrication, and installation practices comply with the requirements of this code.

Inspection shall consist of visual examination, during or after manufacture, fabrication, assembly, or pressure tests as appropriate. Supplementary types of nondestructive inspection techniques, such as magnetic-particle, radio graphic, and ultrasonic, shall not be required unless specifically listed herein or in the engineering design.

In the event repairs or additions are made following the pressure test, the affected piping shall be tested.

A piping system shall be tested as a complete unit or in sections. Under no circumstances shall a valve in a line be used as a bulkhead between gas in one section of the piping system and test medium in an adjacent section, unless two valves are installed in series with a valved “tell tale” located between these valves. A valve shall not be subjected to the test pressure unless it can be determined that the valve, including the valve closing mechanism, is designed to safely withstand the pressure.

Regulator and valve assemblies fabricated independently of the piping system in which they are to be installed shall be permitted to be tested with inert gas or air at the time of fabrication.

Test Medium: The test medium shall be air or an inert gas (Nitrogen). OXYGEN SHALL NEVER BE   USED.

System Testing Preparation

  1. Pipe joints, including welds, shall be left exposed for examination during the test.
  2. Expansion joints shall be provided with temporary restraints, if required, for the additional thrust load under test.
  3. Appliances and equipment that are not to be included in the test shall be either disconnected from the piping or isolated by blanks, blind flanges, or caps. Flanged joints at which blinds are inserted to blank off other equipment during the test shall not be required to be tested.
  4. Where the piping system is connected to appliances, equipment, or equipment components designed for operating pressures of less than the test pressure, such appliances, equipment, or equipment components shall be isolated from the piping system by disconnecting them and capping the outlet(s).
  5. Where the SNG piping system is connected to appliances, equipment, or equipment components designed for operating pressures equal to or greater than the test pressure, such appliances and equipment shall be isolated from the piping system by closing the individual equipment shutoff valve(s).
  6. All testing of piping systems shall be done with due regard for the safety of employees and the public during the test. Bulkheads, anchorage, and bracing suitably designed to resist test pressures shall be installed if necessary. Prior to testing, the interior of the pipe shall be cleared of all foreign material.

Pressure Testing Requirements

Test pressure shall be measured with a manometer or with a pressure measuring device designed and calibrated to read, record, or indicate a pressure loss due to leakage during the pressure test period. The source of pressure shall be isolated before the pressure tests are made.SNG Gas System Testing Method Of Statement

The test pressure to be used shall be no less than 11/2 times the proposed maximum working pressure, but not less than 3 psi (20 kPa), irrespective of design pressure. Where the test pressure exceeds 125 psi (862 kPa), the test pressure shall not exceed a value that produces a hoop stress in the piping greater than 50 percent of the specified minimum yield strength of the pipe.

Test duration shall be not less than 1/2 hour for each 500 ft3 (14 m3) of pipe volume or fraction thereof. When testing a system having a volume less than 10 ft3 (0.28 m3) or a system in a single-family dwelling, the test duration shall be permitted to be reduced to 10 minutes. For piping systems having a volume of more than 24,000 ft3 (680 m3), the duration of the test shall not be required to exceed 24 hours.

The range of the pressure gauge shall not be greater than 5 times the test pressure.

Detection of Leaks and Defects

The SNG/LPG piping system shall withstand the test pressure specified without showing any evidence of leakage or other defects. Any reduction of test pressures as indicated by pressure gauges shall be deemed to indicate the presence of a leak unless such reduction can be readily attributed to some other cause.

The leakage shall be located by means of an approved gas detector, a non-corrosive leak detection fluid, or other approved leak detection methods. Matches, candles, open flames, or other methods that provide a source of ignition shall not be used.

Where leakage or other defects are located, the affected portion of the piping system shall be repaired or replaced and retested.

Test Gases: Fuel gas shall be permitted to be used for leak checks in piping systems that have been tested in accordance with Pressure Testing and Inspection.

Before Turning Gas On: Before gas is introduced into a system of new gas piping, the entire system shall be inspected to determine that there are no open fittings or ends and that all manual valves at outlets on equipment are closed and all unused valves at outlets are closed and plugged or capped.

Purging: Wherever practicable, directly vent purged gases to a safe location outdoors, away from people and ignition sources. Never purge flammable gas inside the building. Use a suitable length and flexible hose to safety purge the gas outside the building. All ignition sources should be controlled or eliminated; ventilation should be adequate to maintain the gas concentration well below the lower explosive limit at all times. Always use combustible gas detectors to monitor the gas concentration during purging operations.

Tests for Leakage: Immediately after the gas is turned on into a new system or into a system that has been initially restored after an interruption of service, the piping system shall be tested for leakage. If leakage is indicated, the gas supply shall be shut off until the necessary repairs have been made.

Placing Equipment in Operation: Gas utilization equipment shall not be placed in operation until after the piping system has been tested for leakage and purged before placing in operation.