FLAME ARRESTORS AND SHIELDING                                                The intention of the requirement to shield the valve discharge was to   reduce the possible danger to personnel from flame emission. However   explosion testing has shown that whilst a flame arrestor will work   satisfactorily when shielding is not fitted, when shielding is fitted, the   energy from the discharge is focussed in one direction, and there will be an   emission of flames during an explosion. The fitting of shielding also reduces   the effective outflow area of a valve.    Since July 2002 it has been a Lloyds Register rule requirement to fit   flame arrestors and to test the relief valve with any proposed shielding to   be fitted  to the valve when installed on the engine.    A test procedure for new crankcase relief valves has been developed   over the past four years by MAN B&W, The Physical Test Institute in the Czech     Republic , Hoerbiger, and various   classification socie...
 
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