Coast Guard Regulations (46 CFR) require that main steam piping must be hydrostatically tested at specified intervals. If the pipe insulation cannot be removed during this test, the piping shall be tested at __________.
• 46 CFR requirements for hydrostatic tests on main steam piping • Difference between test pressure and maximum allowable working pressure (MAWP) • Why insulation staying on the pipe might affect how conservative the test must be
• Think about whether being unable to see the pipe surface during the test would make the required test conditions more severe or less severe than normal. • Recall typical hydrostatic test practices: is test pressure usually equal to, greater than, or less than the normal working pressure? • Consider which option best reflects a safety margin that accounts for hidden defects under the insulation.
• Verify in 46 CFR Subchapter F – Marine Engineering where hydrostatic testing of main steam piping is discussed. • Check which multiple of maximum allowable working pressure (MAWP) is commonly used for hydrostatic tests in other piping rules. • Confirm that the chosen answer provides both a pressure level and a minimum holding time consistent with detecting leaks when the pipe cannot be visually inspected.
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