A form of steel degradation that occurs when hydrogen penetrates metal at high temperatures, causing cracking and equipment failure. Subcontractors working on refineries or pressure vessels must verify equipment is rated for HTHA risk before beginning work. Inspection and repair scopes in affected units often require specialised NDE certifications and strict safety protocols.
HTHA (High Temperature Hydrogen Attack)
Related Terms
Frac Campaign
IndustryA scheduled series of hydraulic fracturing operations across multiple wells or stages within a defined period, representing a concentrated burst of work that subcontractors must plan for with adequate crew, equipment, and supply chain capacity. For field service companies, winning a spot in a frac campaign can mean weeks of steady, high-volume work but also demands tight mobilisation timelines and the ability to scale up quickly.
Trade Sequencing
IndustryThe scheduled order in which different trades perform their work on a project site. Subcontractors must complete their scope before the next trade can mobilise. Delays in your phase can push your crew off-site and disrupt your billing cycle.
Spoil Pile
IndustryExcavated soil, rock, or debris removed during trenching or grading and stockpiled on-site. Subcontractors are often responsible for its placement, management, and disposal per site plans. Improper handling can trigger environmental compliance issues and project delays.
Gas Processing Plant
IndustryFacility that strips raw natural gas of water, impurities and natural gas liquids before pipeline transport. Subcontractors here handle instrumentation, mechanical and electrical work under strict process safety rules. Turnarounds at these plants often mean tight schedules and large multi-crew mobilizations.
NOC (National Oil Company)
IndustryA state-owned oil producer that controls exploration and production within its country. NOCs often require local content compliance, affecting subcontractor hiring and procurement. Payment cycles and approval chains can be longer than with private operators.
Frac Flowback
IndustryThe phase after hydraulic fracturing when water, sand, and hydrocarbons flow back to surface from the wellbore. Subcontractors are often mobilised quickly to manage fluid handling, testing, and disposal. Flowback work can be short-duration but requires crews and equipment on standby.
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