OBJECTIVE:
Philadelphia Safety Devices, 1746 Winchester Road, Bensalem, PA 19020, USA, requested explosion tests to be carried out on one of their explosion relief doors. Two complete doors and spare door panels of the same size and design were submitted to HSL for testing. The objective was to estimate an effectiveness factor to a static opening pressure (Pstat) of 0.1 bar, to determine the mechanical integrity of the door and also to carry out a test with the door Pstat set at 0.01 bar. The door had an explosion relief area of 1 m2 and the test vessel had an internal volume of a 20 m3.
MAIN FINDINGS:
The effectiveness of the door was assessed at a Pstat of 0.1 bar and was found to be equivalent to a weak bursting foil having a Pstat of 0.1 bar. The dust used in the tests had a Kst value of 211 bar m/s and Pmax of 8 bar.
The lowest pressure at which the door opened in the air blast test was 17 mbar, and in the explosion tests was 22 mbar.
The
door operated successfully in all the explosion tests, even without the latch
release pins in place. Superficial damage was sustained
by the door at low values of Pstat
and worsened when the Pstat was increased
to 0.13 bar. However, this was
not detrimental to the operation of the door.
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