Risk Assessment for Drainage Pipes Installation

Construction and HSE team must ensure that hazard identification is complete before start of the drainage piping work.

The construction and HSE team must prioritize the hazard issues, which are of significant in nature. (It means that risks have well established legal requirements, potentially high risks).

Construction and HSE team to prepare the risk assessment plan for the priorities identified hazards for these potential high risks.

Risk is the probability of an event occurring in a given set of circumstances. The ‘event’ is an exposure to hazard. The hazard is the potential to cause harm. The risk assessment is the technique of evaluating not just the likelihood of an event occurring, but also the outcome will be in terms of injury, loss, damage or harm.

Risk Assessment Process

The process of carrying out a risk assessment should be as follows.

Identify the hazards.

Identify who might be harmed and how.

Evaluate the risk and implement the control measures.

Record the significant findings.

Review the assessment and update if necessary.

Examination of the Hazards and Associated Risks

Competent staff must be used in examining the risk associated with the identified hazard.

The competent staff should examine following aspect to determine the risk involved:

Examine the existing control measures in place.

Identify employees at risk.

Likelihood of risk.

Severity of damage or loss

Risk level and their tolerability.

Evaluating the Risk

Once the necessary information has been obtained on the hazards encountered by work activities, next stage is to access the risks.

Risk Rating Score

Risk rating score is a combination of two factors.

The severity of the risk that could injure persons or cause damage to plant.

Likelihood of the risk that it could happen (Probability).


NOTE: Each activity has to be assessed for the risk value for determining the level of Severity and likelihood, as mentioned in the table below.

risk assessment matrix for evaluating the risk

Detailed Risk Assessment for Drainage Works


Residual Risk Ranking

(With Controls)

Responsible Person
L S Risk Score Risk Rating L S Risk Score Risk Rating
Delivering, unloading and storing of PVC Pipe and fittings using pickup and unloading by manual handling Plant and Traffic movement

Run over by vehicles/plants

Hit by reversing equipment

Overhead obstructions

Vehicle break down

Property damage

Collision with other vehicles

Personal injury

Fatality Accident due to poor lighting and visibility (operation at night

Operatives Staff/visitors 3 4 12 Medium Delivery/ collection drivers shall be subject to induction/Training with regards to traffic  management.

Ensure exclusion zone is set up around the preparation work area and all plant movement and checked by supervisor

Always use the pedestrian access provided

Traffic light batons shall be provided for banks man at night

All plant to have a fully trained banks man present all times.

No plant to reverse without banks man.

Ensure access route are sufficient and safe to use.

Do not take rest in or under vehicles

Proper barricade and safety signboard provided on open excavation

All vehicles must be fitted with reverse alarm / Flashing light.

The work place and all access to be well illuminated.

Enforce Speed limit

Ensure all vehicles entering the site is properly maintained and reported if found any defect

Ensure materials are secured/tied in pallet trolley to avoid fall from trolley.

1 4 4 Low Site Engr. Supervisor, Foreman,
Manual Handling Musculoskeletal disorders

Hand injuries

Cut & bruises

Operatives involved in work 3 4 12 Medium Eliminate the need for manual handling by using mechanical aid.

Reduce the weight of a load to limit force exertion

If unsure of the load weight, check with supervisor.

Ensure proper manual handling procedure

Ensure adherence with sufficient and appropriate PPE.

Limit load carrying to 20kg per person

Supervisor must make sure while manual handling load individual task and environment to be considered to reduce the risk of manual handling.

1 4 4 Low Supervisor, Foreman, Site Engr.
Material storing Slips, Trips and fall

Poor house keeping

Operatives Staff / storekeeper 3 4 12 Medium Ensure accesses are kept clear at all times.

Housekeeping to be carried out regularly throughout the day when required

Supervisor to ensure operatives are stacking material neatly and stacks are stable and in a safe condition

Provide adequate lighting especially during night hours

Appropriate space is allowed around storage areas for employees to move around safely without the risk being trapped between stacked materials.

Maintain good housekeeping.

1 4 4 Low Supervisor


Site Engr.

Installation of drainage Pipe (PVC) with accessories fittings using mobile Tower  


Work at height

Fall form height

Falling objects

Over loading

Protruding objects

Access & egress

Operatives/ Staff/ Visitors Others 3 4 12 Medium STARRT card briefing must before start the activity

Ensure the PTW in place.

Ensure proper working platform with complete fall protection

Ensure Full body harness and 100% Tie off

Ensure the scaffold platform is properly erected with “Safe to use” tag.

Ensure castor wheels are locked

Hand tools must be secured/tethered

Work materials strictly not allowed to be stored on platform except for working tools

Ensure avoid over reaching and climb on handrail.

Ensure unauthorized person not allowed to modify the scaffolding and if needed to any changes then must be modified by trained and certified scaffolder.

Ensure safe access to the working platform

Scaffold access must be free from obstruction

Ensure sufficient illumination in work area

Ensure while fittings the GI clamp and brackets operatives must safely use drill machine to avoid finger injury.

Ensure that working near fragile surface special care of body and eye protection with necessary PPE.

Must clean the debris after completion the job and maintain good housekeeping.

1 4 4 Low Supervisors


Site Engineer

Use of Ladder Falling from height

Working on Uneven ground

Falling objects

Operatives/ Staff/ 3 4 12 Medium Only light work, off short duration and work in which the operative can maintain secure hand and foot hold can be undertaken form a ladder

Never try to overreach with any ladders

Check the ladder is of suitable quality for industrial use and is in good condition

Maintain a minimum of 3 points of contact with stepladders at all times (feet/thighs/hands)

If possible avoid the use of stepladders at a working height of 2 meters and more.

Check the ladder legs (and stays) are fully deployed or locked (depending on type) to maintain maximum base dimensions and the step ladder is orientated to provide maximum stability.

Stepladders/ladders has to be used on leveled ground/firm base

Ensure that during using ladder from the top 2 step is blocked to avoid climb on that.

The ladder securely fixed to prevent slipping outwards or sideways or securely footed at all times.

Person must hold the ladder while another operative working on it

Materials should not be placed above the thread of ladders/step ladders

1 4 4 Low Supervisor

Site Engineer


Do not carry any materials in one hand while climbing or getting down from ladder

Ensure the area under the ladder is barricaded especially if it is being used in a public area.

Ensure the ladder is electrical insulated podium type if working in live services

Use of Glue Solvent, (Hazardous Substance) Spillage/ soil contamination


Contact with skin

Acute/Chronic adverse heath effect.


Operatives using solvent 3 4 12 Medium Ensure that all chemical substances have a COSHH assessment

Refer SDS prior to any handling of hazardous substances and ensure SDS is easily accessible at site while working with chemicals.

Ensure chemicals are properly stacked.

Ensure all chemical containers are properly labeled.

Spill kits to be available at site.

Ensure operatives use the correct PPE

Competent person to oversee the storage, use and disposal of hazardous materials.

Ensure that correct welfare/first aid facilities are available in the area i.e. washing facility/eye wash.

Proper and adequate PPE to be used always

Ensure all chemical containers are properly labeled.

Adjust work schedules so that workers are not overexposed to a hazardous chemical.

Wear respiratory protection

Ensure proper and adequate PPE to be used always.

Ensure smoking only in designated area

Ensure appropriate Firefighting equipment’s are in place and easily accessible

1 4 4 Low Supervisors


Site Engineer

Use of power tools such as Grinder/Cutter & Drill machine, Damaged Sockets & cable insulation.


Electric shock

Short circuit & Burns



Hearing loss



Operatives and staff 3 4 12 Medium All portable electrical equipment must be PAT tested and color coded. Make sure the test dates are visible on the equipment.

Ensure all disk shall be appropriate and expiry date is over.

Ensure all power tools are in good condition and appropriately maintained

PTW to be obtained, prior to commencing the task

Damaged industrial sockets and power cables must be removed.

Ensure the electrical cable is not damaged and has not been repaired with insulating tape or unsuitable connectors.

Ensure cables from power tools shall be organized so as not to present a tripping hazard

Only trained competent operatives to operate the power tools.

Ensure proper and regular maintenance of equipment that takes account of noise

Ensure proper hearing protection always.

Make sure people use the right tool for the job and are trained to use it correctly

Ensure defective tools that require maintenance is reported for repair or replacement.

Instruct workers to keep their hands warm and dry, and to not grip a vibrating tool too tightly.

Ensuring proper job rotation and limiting time operatives working with power tools and hand tools.

Use dust mask

Ensure proper earth leakage protection is provided.

All power tools must be 110V to be ensured.

1 4 4 Low Supervisor


Site Engineer

Working under High temperature Direct sun light Dusty High wind Heat exhaustion.

Heat stroke


Personal injuries due to high temperature

Sunstroke & Tiredness

Workers 4 4 16 High Arrange adequate drinking water and rest shelter

Drink plenty of water with electrolyte

If feel something unusual immediately inform supervisor and report to site clinic.

Make shift to operate the routine work

Do not allowed alone work

Frequent breaks

Proper supervision available

Correct PPE must use

Provide heat stress training

Conduct tool box talk

Proper signage for drinking water

1 4 4 Low Site Engr.



Working at night time Poor visibility due to darkness / poor illumination

Lone worker

Operatives/staff 3 4 12 Medium Ensure proper night work permit is obtained

Proper lighting system should be in place

Ensure proper Communication / Coordination and close supervision

Industrial safe torches to be available for emergency situations

High visibility Traffic Vest for personnel’s in night shift

Avoid lone working and always ensure buddy system while working at night

Employees to be trained and understand crises plan.

1 4 4 Low Site Engr.



Pressure Testing Hydro test

High-pressure leak of water

Failure of hydraulic test pump

Electric shock Electrocution

All operatives involved in work 4 4 16 High Risk assessment must brief to the operatives.

Ensure permit obtained for pressure test.

All pressure tests must be conducted with due regard for the safety of life and property.

Precautions should be taken to see that people not directly engaged in the testing operations remain out of the test area during the test period.

During pressure testing events, distinct warning signs, such as DANGER – HIGH PRESSURE TESTING IN PROGRESS must be posted at the test work area with exclusion zone.

Check that all high points have a tap or vent to facilitate removal of air during filling and that these are all closed.

Blank, plug or seal any open ends and close all valves at the limits of the test section of the piping.

Start to fill the piping and then ‘walk’ the route of the piping under test, continuously visually checking for leaks and by listening for the sound of escaping air

Release air from all the high points systematically through the system to completely fill it with water

Check that the test gauge is functioning correctly has been calibrated and has the correct range of the test pump.

Check that a suitable hose is available for draining the system

Before attempting test, Supervisor will review the test specifications and procedures with the Test Inspector and any other relevant personnel to be certain that all equipment is adequate, and duties are organized and understood

All the electric live service must be temporary isolate to avoid electric shock and electrocution

STARRT talk must conduct by supervisor

PPE must in use with face shield

Ensure proper grounding and earthling.

After completion of the pressure test, release the water and disconnect all the temporary connections and close both ends

Exclusion zone must be removing and remove the danger signage after completion of pressure test.

1 4 4 Low Site engineer



Use of Hand tools Improper selection of hand tools.

Damaged and Defective Hand tools.

Hand injuries

Pinch point


Repetitive strain injury

Operatives/Staff 3 3 9 Medium Hand tools should be visually inspected for defects, prior to use.

Never use damaged, blunt or broken tools to avoid injury.

Select right tools for right Job

Ensure no Homemade or makeshift tools to be used at site

Remove from service any tool that shows signs of damage or defect

Ensure Hand tools are Stored in accordance with the manufacturer’s instructions.

Ensure hands are not in direct line of fire while working with hand tools

Ensure appropriate PPE at all times.

1 3 3 Low Site engr.



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