Procedure for Hydro-blast
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Doc Title Rev. 1.0 Next Rev June 2027
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Date of Analysis Reviewed By
1. Purpose
The purpose of this procedure is to ensure that all hydroblasting operations are conducted safely, in
compliance with occupational health and safety regulations, and in accordance with Company’s zero-harm
policy.
Hydroblasting involves the use of high-pressure water systems to clean or prepare surfaces and equipment
in industrial environments such as chemical plants, refineries, and manufacturing facilities.
2. Scope
This procedure applies to all personnel involved in hydroblasting operations, including supervisors,
operators, assistants, and client representatives. It covers:
Pre-job planning
Equipment inspection
Safe operation of high-pressure systems
Risk control measures
Emergency procedures
3. Definitions
TERM DEFINITION
Hydroblasting The process of using high-pressure water jets to remove scale, coatings, debris,
or contaminants from industrial
High-Pressure System Equipment capable of generating water pressure exceeding 70 bar (1000 psi).
Operator A trained and authorized person who controls the jetting gun or lance.
Supervisor A qualified person responsible for overseeing the safe execution of work.
4. Roles and Responsibilities
ROLE RESPONSIBILITIE
Supervisor Ensures all safety procedures are followed, conducts risk assessments, briefs
the team
Operator Operates the hydroblasting equipment safely and reports any issues
Assistant Assists with setup, monitoring, and communication during operations
HSE Officer Conducts audits and ensures compliance with safety standards
Client Representative Provides site-specific information and confirms isolation and access conditions
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5. Steps in Sequence – Hydroblasting Operations
5.1 Pre-Job Requirements
Risk Assessment & Permit to Work
Complete and sign a task-specific risk assessment .
Obtain a valid Permit to Work before starting.
Toolbox Talk
Conduct a pre-start toolbox talk with all involved personnel.
Review hazards, roles, and emergency procedures.
Equipment Inspection
Inspect:
High-pressure pump
Hoses, fittings, and connectors
Nozzles and lances
Safety gear (harnesses, PPE)
Ensure all equipment is certified and in good working condition.
PPE Check
All personnel must wear appropriate PPE:
Full-face shield or goggles
Hearing protection
Chemical-resistant suit or overalls
Steel-toe gumboots
Elbow-length PVC gloves
Hard hat
Harness and lanyard if working at height or in confined spaces
Barricading and Signage
Barricade the work area using cones, tape, or barriers.
Display warning signs: “High Pressure Water Jetting in Progress – Authorized Personnel Only ”
Isolation and Lockout/Tagout (LOTO)
Ensure that mechanical, electrical, and process systems are isolated.
Apply LOTO controls where necessary.
5.2 During Hydroblasting, Start-Up Procedure
Operator ensures:
1. Gun trigger is released
2. Machine operator starts the unit at low RPM
3. Pressure is gradually increased to the required level
4. Supervisor verifies that all personnel are clear before pressurization.
Gun Operation
1. Operator holds the gun firmly and directs the jet away from themselves and others.
2. Never point the jet at people, animals, or unintended surfaces.
3. Maintain stable footing at all times.
Lance Operation
1. If using a lance, insert it into the vessel or pipe before engaging pressure.
2. Use anti-withdrawal devices when cleaning pipelines or tubes.
3. Mark lances at 1-meter intervals to warn of proximity to the end of the tube.
Communication
1. Maintain clear communication between Operator, Assistant, and Supervisor.
2. Use hand signals or radios if visibility or noise levels require it.
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Controlled Movement
1. Release pressure before moving to another section or adjusting position.
2. Never move while the system is under full pressure.
Monitoring Conditions
Watch for:
1. Hose vibration or stress
2. Leaks or damaged fittings
3. Changes in atmospheric conditions (especially in enclosed areas)
5.3 Post-Job Requirements, Shut Down Procedure
1. Operator releases pressure via foot valve or trigger.
2. Machine operator turns off the unit.
3. Confirm that there is no residual pressure in the system.
Final Inspection
1. Inspect equipment for damage or wear.
2. Clean and store tools properly.
Housekeeping
1. Remove debris, sludge, and waste material.
2. Wipe down or drain wet areas to prevent slips and falls.
Documentation
Complete and file:
Risk Assessment
Permit to Work
Toolbox Talk Sheet
Incident Report (if applicable)
6. Hazard Control Measures
HAZARD CONTROL MEASURE
High-pressure injury Never point nozzle at self or others; wear full PPE
Slips and falls Keep walkways clear; use non-slip boots
Noise exposure Wear hearing protection
Electrical hazard Keep electrical components dry and grounded
Confined space risks Confined Space Entry
Manual handling Use lifting aids; avoid heavy lifting alone
7. Emergency Procedures
In the event of an emergency:
1. Stop the machine immediately.
2. Call for help using radio, phone, or alarm.
3. Administer first aid until professional assistance arrives.
4. Evacuate the area if unsafe conditions exist (e.g., gas release, fire).
5. Complete an Incident Investigation Form and submit to HSE Officer.
6. Rescue operations must follow Document – Rescue Plan – Working at Heights / Confined Spaces if
applicable.
8. Training & Competency
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All personnel involved in hydroblasting must complete:
1. Basic Hydroblasting Certification
2. Use of PPE and Personal Fall Arrest Systems
3. Confined Space Entry (if applicable)
4. Emergency Response and First Aid
5. Refresher training is required annually or after incidents.
9. Approval and sign-off section
NAME POSITION SIGNATURE DATE
Operations Manager 16.2 Assignee
Safety Officer
Supervisor
Client Representative (If applicable)
The following personnel confirm that this procedure has been reviewed, understood, and will be followed by
all relevant parties.
Copyright 2025
Revision 1.0. Revised June 2025 Next revision June 2027
