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Boiler Plant Operations
Published in Carl Bozzuto, Boiler Operator's Handbook, 2021
As with filling a boiler, there should be a person assigned to control the pump or valve that is pressurizing the system. Be as certain as possible that all air has been removed from the system. A system is usually air free if the water pressure increases rapidly once everything is closed. If the pressure does not jump to city or system pump pressure, there may be air in the system. Once the hydro pump has been started, look at the gauge. If the pressure is not jumping up with each cycle of the pump, then there is still air in the system. Get that air out. If the system ruptures with compressed air in it, the air and water will pass out through the point of failure with dramatic force. Hydrostatic tests should be conducted with water between 70°F and 120°F for reasons of safety. That temperature range is also required by code. Normally hydrostatic test pressure is 150% of the maximum allowable pressure or the setting of the safety valves. Newer equipment is manufactured with steel at higher rated pressures. Because higher stresses are allowed, the requirements for a hydrostatic test pressure may be 125% of the design pressure instead of 150%. There is still a lot of equipment out there that were tested at 150%. It is also a good idea that it be tested at that pressure after any repair or for a preventative maintenance check.
Natural Gas Industry: An Introduction
Published in Pramod Paliwal, Sudhir Yadav, Natural Gas Transmission and Distribution Business, 2019
After the construction phase (including welding, coating, valves, metering system, and compression infrastructure) is completed, trial runs are carried out before the actual flow of natural gas. This trial run is done through a test called the hydrostatic test. Water is made to flow at higher pressures (equal to or greater than the pressure at which natural gas will flow in the pipeline) through the entire length of the pipeline. The hydrostatic test checks the endurance of the pipeline network along with any possibilities of leaks, breakages, fissures, and so on.
Boiler Plant Operations
Published in Kenneth E. Heselton, Boiler Operator’s Handbook, 2020
Hydrostatic tests should be conducted with water between 70°F and 120°F for reasons of safety, that temperature range is also required by code. Normally hydrostatic test pressure is 150% of the maximum allowable pressure or the setting of the safety valves.
A proposal to avoid leakage of CO2 from onboard high-pressure CO2 cylinders
Published in Journal of International Maritime Safety, Environmental Affairs, and Shipping, 2020
Kyoung-Woo Lee, Jeong-in Yun, Won-Ju Lee, Beom-Seok Rho, Jang-Won Cho, Jae-Hyuk Choi
The internal inspection and hydrostatic test of the high-pressure CO2 cylinder is described at paragraph 6.1.2 of MSC.1/Circ.1318 as follows; “6.1.2the hydrostatic test date of all storage containers should be checked. High pressure cylinders should be subjected to periodical tests at intervals not exceeding 10 years. At the 10-year inspection, at least 10% of the total number provided should be subjected to an internal inspection and hydrostatic test**. If one or more cylinders fail, a total of 50% of the onboard cylinders should be tested. If further cylinders fail, all cylinders should be tested. Flexible hoses should be replaced at the intervals recommended by the manufacturer and not exceeding every 10 years; and”