The Test and Evaluation of Flow Fuses for Use in Manned Pressure Chambers
1973
Holland, Clifford R.
Manned pressure chambers used in sea or shore diving operations are subject to catastrophic depressurization from external piping failures. Recently, a device designed to permit bidirectional fluid flow while protecting 'flow out' lines has become available. This device, called a Flow Fuse, is essentially a flow sensitive check valve with the poppet spring-loaded open. Flow fuses were procured and evaluated using a test piping system to simulate line ruptures and sudden large increasing leaks; four fuse sizes were tested (1/ 4 in., 1/2 in., 1 in. and 2 in. line sizes). Data on closure flows, differential pressures, and closure speeds were analyzed. Rapid closure (10 - 100 milliseconds) occurred when flow attempted to exceed trip point settings. No failures occurred in 10,000 total actuations. All fuses have adjustable trip points, easy serviceability, and should provide excellent resistance to corrosive environments.
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