Florida Gas Transmission Mainline Hydrostatic Test
About The Test

A hydrostatic pressure test consists of filling a pipeline with water under pressure. Before the test begins, all natural gas is removed from the system. System valves will be shut off and customers will use up the natural gas in the system, starting approximately one week before the test. During the test, natural gas service will be continued on a parallel loop system, so Florida Gas Transmission Company customers can maintain their normal use, uninterrupted. After safely venting off any residual remaining natural gas, the pipeline will be filled with water.

Under normal conditions, the natural gas pipeline operates at 722 PSI (pounds per square inch) of pressure. Under hydrostatic testing conditions the pipeline will be stressed, with water, to almost double that pressure (1,444 PSI) for approximately 30 minutes. The second stage of the test will maintain the pressure on the pipeline at 1,100 PSI for approximately 8 hours.

If any integrity issues in the pipeline are found during the test, they will be corrected as soon as possible, immediately following the removal of the water from the system. After any required repairs are completed, the entire hydrotest will be performed again. Upon successful completion of the test, the water will be removed from the system, and normal natural gas service will be resumed.