Naval Historywith Dr. Alex

Q&A · 2:02:33-2:02:49

Boiler working pressure versus test pressure

The pressure figures in the naval architects' table are operating limits, while hydraulic tests normally impose a higher load.

BoilersMarine EngineeringNaval ArchitectureSafety Standards
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Question

Are the listed boiler figures operational pressures or hydraulic-test pressures?

Short answer

They are operational working pressures; the hydraulic test would normally be performed at a higher pressure.

Notes

The listed figures are working pressures, the pressures at which the boilers operate. Hydraulic tests normally apply a somewhat higher pressure. Treating the test load as the operating figure would therefore overstate the pressure available in service. Historical boiler tables need to be read with that distinction in mind.