General procedures for pigging and pressure testing before the commissioning of oil and gas pipeline projects

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Hydraulic testing procedure for oil pipelines: cleaning the pipe section → measuring the diameter of the pipe section → filling the pipe section with water → increasing pressure in the pipe section → maintaining constant pressure → releasing pressure and draining water from the pipe section → flushing water from the pipe section → joining the pipe sections together → cleaning and measuring the diameter of the pipe sections between stations → inflating the pipe sections between stations → sealing the pipe sections between stations. Hydraulic testing procedure for gas pipelines: cleaning the pipe section → measuring the diameter of the pipe section → filling the pipe section with water → increasing pressure in the pipe section → maintaining pressure → releasing pressure and draining water from the pipe section → flushing water from the pipe section → joining the pipe sections together → flushing water from the inter-station pipe sections → measuring the diameter of the inter-station pipe sections → drying the inter-station pipe sections → inflating the inter-station pipe sections → sealing the inter-station pipe sections. Pneumatic testing procedure for oil pipelines: cleaning the pipe section → measuring the diameter of the pipe section → inflating and pressurizing the pipe section → stabilizing the pressure in the pipe section → releasing pressure and venting air from the pipe section → joining the pipe sections together → cleaning and measuring the diameter of the inter-station pipe sections → inflating the inter-station pipe sections → sealing the inter-station pipe sections. Pneumatic testing procedure for gas pipelines: cleaning the pipe segment → measuring the diameter of the pipe segment → filling the pipe segment with gas and increasing pressure → stabilizing the pressure in the pipe segment → releasing pressure and venting gas from the pipe segment → joining the pipe segments together → cleaning and measuring the diameter of the inter-station pipe segments → filling the inter-station pipe segments with gas → sealing the inter-station pipe segments.