Class Code 6233
Oil/Gas Pipe Line Construction
Class Code 6233 covers construction, installation, overhaul and relocation of oil and gas transmission pipelines and associated right-of-way work. The approved pure premium for California effective September 1, 2026 is $2.168 per $100 of payroll — a reflection of the high-risk, heavy-equipment and excavation operations typical of pipeline crews.
What Class Code 6233 Covers
This classification applies to contractors who build, install, maintain and relocate oil and gas transmission pipelines — including open-cut pipe installation, directional drilling under obstacles, welding and joining, coating and cathodic protection, trenching and backfilling, hydrostatic testing and major repairs. It covers work along rights-of-way, across public and private property, and includes temporary access construction, road crossing reinstatement and slope stabilization tied directly to pipeline installation. Activities such as heavy-lift placement of pipe, laybarge operations for water crossings, on-site bending and field welding, and in-line inspection preparations are included. It does not cover routine gas distribution service or refinery production operations that have different classifications.
Who It Applies To
- Pipeline construction contractors (main line transmission)
- Directional drilling/subsurface boring subcontractors working on pipeline installation
- Field welding and pipefitting crews performing field joints and hot work
- Heavy equipment operators (pipelay sidebooms, excavators, graders)
- Coating/cathodic protection crews and hydrostatic test teams
Common Job Duties
- Clearing and grading rights-of-way and access roads
- Trenching, ditching, shoring and backfilling for pipe placement
- Field welding, heat treatment and non-destructive testing of joints
- Stringing, bending, lowering-in and welding large-diameter pipe
- Applying coatings, wrapping and installing cathodic protection
- Hydrostatic pressure testing and purging of pipeline segments
- Operating sidebooms, cranes, excavators and lay barges
Common Injury Risks
Understanding the $2.168 Rate
The pure premium $2.168 per $100 of payroll represents the WCIRB's estimated cost of indemnity and medical losses for this classification before insurer loads. Insurers multiply that rate by your payroll in hundreds of dollars, then add expense loads, state taxes, experience modification, policy-specific endorsements and any schedule credits to calculate the final premium. Your actual cost will be affected by loss history, return-to-work performance, safety programs, payroll mix and deductible or retrospective rating choices.
Cal/OSHA Compliance Requirements
Cal/OSHA standards most relevant to pipeline construction include excavation and trenching safety (competent person, protective systems), confined space entry procedures for structure and vault work, welding, cutting and hot work controls, respiratory protection and hazard communication for coatings and solvents, lockout/tagout for equipment, and heat illness prevention for outdoor crews. Employers must implement site-specific safety plans, competent person inspections, permit-required confined space programs, respirator medical evaluation and training, and written hot work and HAZCOM programs.
How Key HR Helps Employers Under Class Code 6233
A PEO like Key HR can centralize workers' comp administration for pipeline contractors—providing claims management, OSHA- and Cal/OSHA-focused training, drug and alcohol testing programs, and streamlined return-to-work processes that reduce indemnity exposure. Key HR's aggregated buying power, dedicated safety consultants and consistent enforcement of safety protocols can improve experience modification and lower the total cost of risk for employers in Class Code 6233.
Get a QuoteFrequently Asked Questions
When should I assign Class Code 6233 instead of another construction code?
Use 6233 for contractors engaged in the construction, installation, relocation or major repair of oil and gas transmission pipelines and associated right-of-way work. Do not use it for local gas distribution service crews, refinery production operations, or routine maintenance tasks that belong to other, more specific codes.
What practical steps lower my workers' comp premium for pipeline work?
Implement a documented safety program focused on trenching/excavation, welding/hot work permits, confined space entry, and equipment maintenance; designate and train a competent person for excavations; run consistent drug-testing and return-to-work programs; and work with a PEO or carrier to improve claims handling and secure schedule credits or group discounts.
What Cal/OSHA training and programs are legally required for pipeline crews?
Employers must provide competent-person oversight for trenching, permit-required confined space programs and attendant training, welding and cutting safety training, respiratory protection programs where coatings/fumes are present, hazard communication for chemicals, and heat illness prevention and training for outdoor operations.
Quick Facts
- Class Code
- 6233
- Classification
- Oil/Gas Pipe Line Construction
- Pure Premium Rate
- $2.168 / $100 payroll
- Effective Date
- September 1, 2026
- Source
- WCIRB Approved Filing
Manage Workers' Comp Through a PEO
Key HR provides pay-as-you-go workers' comp for California employers — no large deposits, no audits, better rates.
Get a Quoteor call (800) 922-4133Ready to Simplify Workers' Comp for Class Code 6233?
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