Authorized Gas Tester (AGT) case studies
Authorized Gas Tester (AGT) · Put your knowledge to work in context.
The Authorized Gas Tester (AGT) credential is a workplace competency qualification for people who test and certify atmospheres before others enter or work in them. It is typically held by operations and maintenance technicians, confined space entrants and standbys, permit issuers, fire watch and hot work personnel, and contractor supervisors in oil and gas, petrochemicals, utilities, marine, mining and heavy manufacturing. The Authorized Gas Tester (AGT) case studies are 5 cases and about 4,746 words.
1Rim readings on a live sewer manhole
A three-person crew is preparing to enter a 4.2 m deep, 1.2 m diameter sewer manhole on a live municipal network. The gas tester holds a four-gas detector fitted with a 3 m sample line and a hand aspirator pump.
988 words, about 5 min2Welding a pad onto a tank that held kerosene
A 20 m³ horizontal mild-steel tank that held kerosene for 12 years has been drained, water-washed and left open through a 400 mm top hatch for four days. A fabrication crew must weld a 150 mm reinforcing pad onto the external shell, 300 mm above the bottom tangent line, to repair a support bracket.
924 words, about 5 min3A functional check that was not a functional check
At 06:15 a gas tester performs a functional (bump) check on a four-gas personal monitor before a shift of confined space standby work. He uses a cylinder labelled 25 ppm H2S, 100 ppm CO, 2.5% CH4 and 18% O2; the certificate is nine months old against a stated twelve-month life, and the cylinder pressure gauge sits in the red zone.
863 words, about 4 min4Oxygen enrichment during oxy-acetylene cutting in a vessel
Inside a decommissioned 8 m³ stainless-steel mixing vessel a fitter is using an oxy-acetylene torch to cut out a seized agitator shaft. The vessel is 2.4 m tall with a 450 mm side manway, and ventilation is a single 300 mm flexible duct from a blower hung at the manway.
980 words, about 5 min5A verbal permit extension at shift change
A confined space entry is under way in a 6 m deep, 2 m diameter surge chamber at a water treatment works. The permit issued at 06:30 states entry authorised 07:00–13:00, gas test valid for two hours, maximum two entrants, one attendant at the top, rescue by tripod and harness, no breathing apparatus entry.
991 words, about 5 min