Boiler Failure under Test Conditions

Boiler Failure under Test Conditions

This topic has 0 replies, 1 voice, and was last updated 30 December 2025 at 14:51 by The Mad Professor.

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30 December 2025 at 14:51 #830515
The Mad Professor
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@themadprofessor
In the dim and distant past, I seem to recall that there was an exchange of letters in Postbag about testing a copper locomotive boiler by pumping it up to the test pressure (twice working pressure) in one go, which resulted in the crown moving down. If I am correct, it was a design which had “Evans” type crown stays which are girder stays that support the crown without attaching it to outer boiler shell. The argument (if I recall correctly) was that taking the test pressure up to the maximum in one go was the cause of the crown coming down, whereas this would not have happened if the boiler had been tested by raising the pressure in increments and allowing time for the boiler to ‘settle’ after the pressure had been raised. Does anyone have the same recollections and could provide the reference to the letters in Postbag?
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