Latest posts
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The strength, leak and spike phases, and what each one proves
A pressure test does more than one job. Strength, leak and spike phases answer different questions at different pressures. What each proves, and why they are separate.
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What a pressure test cannot prove
A successful hydrostatic test proves a margin at one moment. What it does not prove about slow leaks, pressure reversals and future condition.
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Why a hydrostatic test runs four hours plus four hours
49 CFR 195.304 requires four continuous hours at 125 percent of MOP, plus four more at 110 percent when a line is not visually inspectable. Here is why.