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IndustryGlossary Term

LOI (Letter of Intent)

A written commitment from a client indicating they plan to award a subcontractor a contract. It allows work or mobilisation to begin before the formal contract is signed. LOIs are not always legally binding, so subcontractors should clarify payment obligations before proceeding.

Related Terms

Saas (software As a Service)

Industry

Cloud-based software you access via subscription instead of buying and installing it outright. For subcontractors, this covers tools like invoicing, scheduling, and compliance tracking platforms. You pay a recurring fee and can access the software from any jobsite device.

Multi-Trade Pipeline

Industry

A project requiring multiple specialised trades — such as welders, pipefitters, and electricians — deployed in sequence or simultaneously. Subcontractors must coordinate closely to avoid schedule conflicts and delays. Winning work on these projects often requires demonstrating multi-discipline capacity to the prime contractor.

Bladder Tank

Industry

A 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.

Ductile Iron

Industry

A strong, flexible cast iron alloy used in pipes, fittings, and valves on oil and gas and construction sites. It resists cracking under pressure, making it common in water, gas, and slurry line installations. Subcontractors should confirm material specs before procurement, as ductile iron has specific handling and joining requirements.

Mwh (megawatt-Hour)

Industry

A unit measuring one megawatt of electrical power consumed or produced over one hour. Subcontractors encounter MWh when billing for generator rentals, temporary power supply, or energy-intensive equipment on remote sites. It also appears in green energy projects where field crews install or service solar, wind, or battery storage systems.

Combined Cycle

Industry

A power generation setup where waste heat from a gas turbine is reused to produce additional electricity via a steam turbine. Subcontractors working these facilities must be prepared for more complex systems and stricter safety protocols. Maintenance scopes are typically broader, covering both turbine types.

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