Pigging
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Published by SALUSPipeline Pigging Safety =======================
Date: 2025-09-05
Duration: \[DURATION] minutes
Presenter: \[PRESENTER NAME]
Location: \[LOCATION]
Objective
To ensure all personnel understand and follow safe procedures during pipeline pigging operations to prevent injuries and environmental incidents.
Introduction
This toolbox talk covers the safety procedures for pipeline pigging operations, including risk assessments, PPE, and emergency shutdown protocols. Pigging is a common maintenance practice, but it introduces significant hazards that must be understood and controlled.
Key Points
- Risk Assessment: A thorough risk assessment must be conducted before any pigging operation. This assessment should identify potential hazards, evaluate risks, and define control measures.
- Safe Work Procedures: Follow established safe work procedures for all phases of the pigging operation, including preparation, launching, tracking, receiving, and pig removal.
- Communication: Maintain clear and continuous communication between all team members involved in the pigging operation. Use radios or other reliable communication methods.
- Equipment Inspection: Inspect all equipment, including the pig launcher/receiver, pigs, hoses, and pressure gauges, before use to ensure they are in good working condition.
- Pressure Control: Carefully monitor and control pipeline pressure during the pigging operation. Exceeding pressure limits can lead to ruptures or explosions.
- Emergency Shutdown: Know the emergency shutdown procedures and be prepared to activate them if necessary. This includes knowing the location of emergency shutdown devices and how to use them.
Hazard Identification
Pipeline pigging operations involve several potential hazards that can lead to serious injuries or environmental damage if not properly controlled.
- Pressure Release: Uncontrolled release of pressure can cause serious injuries or fatalities.
- Line Rupture: Pipeline rupture can result in the release of hazardous materials, causing environmental damage and potential fire or explosion.
- Struck-By Hazard: Being struck by a projectile pig or equipment failure can cause significant injuries.
- Exposure to Hazardous Substances: Contact with chemicals or hydrocarbons during pigging can lead to skin irritation, chemical burns, or respiratory problems.
- Noise: High noise levels during pigging operations can cause temporary or permanent hearing loss.
Control Measures
- Isolate and Depressurize: Before commencing pigging, isolate the section of pipeline and depressurize it safely. Use a double block and bleed system where possible. [2]
- Implement a Double Block and Bleed System: Use a double block and bleed isolation system providing two blocking seals on either side of the isolation point, and an operable bleed-off between the two seals. [2]
- Secure Valves: Ensure that if valves or similar blocking seals with a bleed-off valve between them are used to isolate piping or a pipeline, the bleed-off valve is secured in the "OPEN" position and the valves or similar blocking seals in the flow lines are functional and secured in the "CLOSED" position. [2]
- Mechanical Securing: Use a positive mechanical means of keeping the valves or seals in the required position, strong enough and designed to withstand unintended opening. [2]
- Pressure Testing: Conduct pressure testing of pipelines ensuring workers and the public are protected against injury by the blowing out of closures or other pressure restraining devices. [4]
- Positioning of Workers: Ensure workers directly involved in the pigging and testing operation are positioned so they are not in a location where they may be injured by the operation. [1]
Personal Protective Equipment (PPE) Requirements
- Hard Hat: Wear a hard hat to protect against head injuries from falling objects or accidental contact. Ensure it fits properly and is in good condition.
- Safety Glasses: Use safety glasses with side shields to protect your eyes from debris, splashes, or other potential eye hazards.
- Gloves: Wear appropriate gloves (e.g., chemical-resistant, cut-resistant) to protect your hands from contact with hazardous substances or sharp objects.
- Hearing Protection: Use earplugs or earmuffs in areas with high noise levels to prevent hearing damage. [3]
- Protective Clothing: Wear appropriate protective clothing (e.g., coveralls, chemical suits) to protect your skin from exposure to hazardous materials.
Real-World Example or Case Study
A pipeline experienced a rupture during a pigging operation due to over-pressurization. The incident resulted in a significant release of oil and environmental contamination. The investigation revealed that the risk assessment was inadequate, pressure control measures were not followed, and the emergency shutdown system was not properly maintained. This highlights the importance of following all safety procedures and maintaining equipment.
Emergency Procedures
- In the event of a pressure release, immediately activate the emergency shutdown system.
- If a line rupture occurs, evacuate the area and report the incident to the appropriate authorities.
- In case of exposure to hazardous substances, immediately flush the affected area with water and seek medical attention.
Questions and Answers
Here are some common questions related to pipeline pigging safety.
- Q: What should I do if I notice a leak during pigging?
A: Immediately stop the operation, isolate the area, and report the leak to your supervisor.
- Q: How often should pigging equipment be inspected?
A: Pigging equipment should be inspected before each use and maintained according to the manufacturer's recommendations.
- Q: What is a double block and bleed system?
A: A double block and bleed system uses two valves to isolate a section of pipe, with a bleed valve in between to release any trapped pressure.
Summary
Recap of main points:
- Always conduct a thorough risk assessment before starting pigging operations.
- Follow safe work procedures and use appropriate PPE.
- Maintain clear communication and monitor pressure closely.
- Know the emergency shutdown procedures and be prepared to use them.
Report all hazards, near-misses, and incidents to your supervisor immediately.
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Sources used for this answer
[1] OSHA General Industry Standards Requiring Programs, Inspections, Procedures, Records and/or Training (NCDOL)
Page 125
Open source documentSource excerpt
# 29 CFR Subpart Q-Welding, Cutting and Brazing # 1910.252-GENERAL REQUIREMENTS Scope/Application: This section applies to welding, cutting and brazing. ## STANDARD HIGHLIGHTS - Programs, Plans and Procedures-hazard communication program, safety data sheets - Inspections and Tests-inspections, atmospheric tests, permits - Recordkeeping-permits - Training and Communications-initial training, fire watchers, hazard communication - Qualified Person-designated management representative - Signs, Markings and Tags-labels, notices ## Programs, Plans and Procedures 1910.252(a)(2)(xiii(A)-Based on fire potentials of plant facilities, establish areas for cutting and welding, and establish procedures for cutting and welding, in other areas. 1910.252(c)(1)(iv)-Hazard communication The employer shall include the potentially hazardous materials employed in fluxes, coatings, coverings, and filler metals, all of which are potentially used in welding and cutting, or are released to the atmosphere during welding and cutting, in the program established to comply with the Hazard Communication Standard (HCS) (Sec. 1910.1200). The employer shall ensure that each employee has access to labels on containers of such materials and safety data sheets, and is trained in accordance with the provisions of Sec. 1910.1200. Potentially hazardous materials shall include but not be limited to the materials itemized in paragraphs (c)(5) [Fluorine Compounds] through (c)(12) [Cutting of Stainless Steels] of this section. ## Inspections and Tests 1910.252(a)(2)(iv)-Authorization. Before cutting or welding is permitted, the area shall be inspected by the individual responsible for authorizing cutting and welding operations. He shall designate precautions to be followed in granting authorization to proceed preferably in the form of a written permit. 1910.252(b)(2)(ii)(l)-Filter lenses must meet the test for transmission of radiant energy prescribed by any of the consensus standards listed in …
[2] Occupational Health and Safety Code (Alberta Regulation 191/2021)
Page 139
Open source documentSource excerpt
# Securing Isolation (cont.) ## Pigging and testing of piping or pipelines (cont.) Section 215.6 OCCUPATIONAL HEALTH AND SAFETY CODE Part 15 AR 191/2021 - 215.6(2) An employer must ensure that, before a pig is removed, (a) a pigcatcher on piping or a pipeline is isolated from the piping or pipeline, (b) the pigcatcher is depressurized, and (c) there are no workers at the end of the piping or pipeline or in the immediate area of the pigcatcher if the piping, pipeline or pigcatcher is under pressure during the pigging and testing operation. - 215.6(3) An employer must ensure workers directly involved in the pigging and testing operation are positioned SO they are not in a location where they may be injured by the operation. AR 242/2022 s20 15-7
[3] Occupational Health and Safety Code (Alberta Regulation 191/2021)
Page 138
Open source documentSource excerpt
# Securing Isolation (cont.) ## Returning to operation (cont.) Section 215.4 OCCUPATIONAL HEALTH AND SAFETY CODE Part 15 AR 191/2021 (b) all personal locks secured by workers under section 214.1,215 or 215.1 are removed, and (c) it is verified that no worker is in danger by the removal of the energy-isolating device or the return to operation of the machinery, equipment or powered mobile equipment. - AR 191/2021 s215.3;242/2022 ## Piping or Pipelines ## Isolation re piping or pipelines 215.4 If piping or a pipeline containing a substance under pressure is to be serviced, repaired, tested, adjusted or inspected, or if any other work is to be performed on it that requires the control of hazardous energy, an employer must ensure that no worker performs such work on the piping or pipeline until flow in the piping or pipeline has been stopped or regulated to a safe level and the location at which the work is to be carried out is isolated and secured in accordance with section 215.5. AR 191/2021 s215.4;242/2022 ## Isolation requirements for piping or a pipeline 215.5(1) To isolate piping or a pipeline containing a substance under pressure, an employer must ensure the use of (a) a system of blanking or blinding, or (b) a double block and bleed isolation system providing (i) 2 blocking seals on either side of the isolation point, and (ii) an operable bleed-off between the 2 seals. - 215.5(2) An employer must ensure that piping or a pipeline that is blanked or blinded is clearly marked to indicate that a blank or blind is installed. - 215.5(3) An employer must ensure that, if valves or similar blocking seals with a bleed-off valve between them are used to isolate piping or a pipeline, the bleed-off valve is secured in the "OPEN" position and the valves or similar blocking seals in the flow lines are functional and secured in the "CLOSED" position. - 215.5(4) An employer must ensure that the device used to secure the valves or seals referred to in s…
[4] Occupational Health and Safety Code (Alberta Regulation 191/2021)
Page 141
Open source documentSource excerpt
# Securing Isolation (cont.) ## Pigging and testing of piping or pipelines (cont.) Section 216 OCCUPATIONAL HEALTH AND SAFETY CODE Part 16 AR 191/2021 # Part 16 Noise ## Duty to reduce 216 An employer must ensure that all reasonably practicable measures are used to reduce the noise to which workers are exposed in areas of the work site where workers may be present. AR 191/2021 s216;242/2022 ## Noise control design - 217 An employer must ensure that the following are designed and constructed in such a way that the continuous noise levels generated do not exceed 85 dBA or are as low as reasonably practicable: (a) a new work site or work area; (b) significant physical alterations, renovations or repairs to an existing work site or work area; (c) a work process introduced to the work site or work area; (d) significant equipment introduced to the work site or work area. - AR 191/2021 s217;242/2022 ## Worker exposure to noise - 218 An employer must ensure that a worker's exposure to noise at a work site does not exceed (a) the noise exposure limits in Schedule 3, and (b) 85 dBA Lex. - AR 191/2021 s218;242/2022 ## Noise exposure assessment 219(1) If workers are, or may be, exposed to noise at a work site or work area in excess of 82 dBA Lex, an employer must ensure a noise exposure assessment is conducted in accordance with CSA Standard Z107.56-18, Measurement of noise exposure. 219(2) An employer must ensure a noise exposure assessment at a work site is performed using (a) a noise dosimeter meeting the requirements for a Type 2 instrument as specified by ANSI/ASA S1.25-1991 (R2020), Specification for Personal Noise Dosimeters, or IEC [redacted postal code]:1993/AMD2:2017, Electroacoustics - Specifications for personal sound exposure meters, and set at (i) a criterion level of 85 dBA with a 3 dB exchange rate, (ii) a threshold level at or below 75 dBA or "off", and (iii) slow response, - or (b) a sound level meter or an integra…
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