All supporting systems and infrastructure outside the primary process equipment, such as electrical, piping, HVAC, and civil works. For subcontractors, BOP (Balance-of-Plant) scope often represents the bulk of awarded field labour. Knowing what falls under BOP helps avoid scope gaps and missed bid items.
Balance-Of-Plant
Related Terms
Bladder Tank
IndustryA collapsible, flexible fluid storage container used on job sites to hold fuel, water, or chemicals. Subcontractors often mobilise them where permanent tanks aren't practical. They're common on remote oil and gas and construction sites.
HDPE (High-density Polyethylene)
IndustryA durable, corrosion-resistant plastic used for pipes, containment liners, and fluid transfer systems on job sites. Subcontractors commonly install or tie into HDPE pipelines in water, gas distribution, and environmental remediation scopes. Its lightweight nature reduces handling costs but requires certified fusion welding for pressure-rated connections.
Underground Electrical Distribution
IndustryA system of buried cables and conduits that delivers power across a site without overhead lines. Subcontractors must locate and verify these lines before any excavation or ground disturbance. Unmarked or mislabelled lines create serious safety and liability risks on job sites.
ABC (Associated Builders and Contractors)
IndustryA U.S. trade association representing merit-shop contractors in construction and industrial sectors. Subcontractors use ABC membership for training resources, safety programmes, and industry networking. Membership can also signal credibility when bidding on open-shop projects.
TIC (Total Installed Cost)
IndustryThe full cost of completing a scope of work, including labour, equipment, materials, and indirect expenses. Subcontractors use TIC to build accurate bids and avoid underpricing complex field installations. Owners and GCs often benchmark TIC when evaluating competing quotes.
Diverging Diamond Interchange
IndustryA road interchange design where traffic briefly crosses to the opposite side of the road between two intersections. Subcontractors hauling heavy equipment or oversized loads must account for altered lane patterns and potential permit route restrictions. Plan site access carefully, as DDI layouts can complicate convoy movements and GPS routing.
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