AISI (American Iron and Steel Institute)

A long elevated bridge structure carrying roads or pipelines over valleys, water, or rough terrain. Subcontractors working near viaducts must account for access restrictions and specialised rigging requirements. Inspection and maintenance contracts on viaducts often require working-at-heights certification.

The lowest acceptable pipe or vessel wall thickness before the component must be repaired or replaced. Subcontractors performing inspection or maintenance work must verify measurements meet this threshold. Falling below it triggers mandatory remediation and can halt operations until resolved.

Sites already approved for drilling within a producing field, based on confirmed reserves data. For subcontractors, these locations represent near-term, lower-risk work opportunities. Expect faster mobilisation timelines and more defined scopes compared to exploratory sites.

Raw, unprocessed natural gas delivered to a processing plant or facility as the primary input. For subcontractors, feed gas specifications determine the scope of compression, treating, and handling work on site. Changes in feed gas composition can trigger scope variations and affect your contract terms.

An offshore vessel that processes, liquefies, and stores natural gas at sea without a fixed onshore plant. Subcontractors work aboard these units for commissioning, maintenance, and inspection scopes. Access is offshore, so mob costs, safety certifications, and logistics are major bid considerations.

A large-diameter pipeline that moves water, gas, or other fluids over long distances at high pressure. Subcontractors are often hired for installation, inspection, or maintenance work on these lines. Strict pressure ratings and material specs govern all field work.

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When operators merge, get acquired, or sell assets, subcontractor agreements are caught in the middle. Learn how M&A activity affects your MSA, payment terms, vendor status, and what to do before, during, and after a deal closes.

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