Transactions . Mr Thomas ^irtarasPaperan wn&v to?7?i of Directactaia Spring Safety Jfatw. FIG. *.-»5Ue DIRECT-ACTING SPRING SAFETY-VALVE. 285 ON A NEW FORM OF DIRECT-ACTING SPRINGSAFETY-VALVE. By THOMAS ADAMS For some time past considerable inconvenience has been felt by themarine engineer from the unpractical nature of the rules and regulationsof the Board of Trade, which give half a square inch of area of safety-valve for every square foot of grate. This rule gives a very largeamount of dead weight to balance the 80 lbs. internal pressure nowuniversally used afloat, and also contains an
Transactions . Mr Thomas ^irtarasPaperan wn&v to?7?i of Directactaia Spring Safety Jfatw. FIG. *.-»5Ue DIRECT-ACTING SPRING SAFETY-VALVE. 285 ON A NEW FORM OF DIRECT-ACTING SPRINGSAFETY-VALVE. By THOMAS ADAMS For some time past considerable inconvenience has been felt by themarine engineer from the unpractical nature of the rules and regulationsof the Board of Trade, which give half a square inch of area of safety-valve for every square foot of grate. This rule gives a very largeamount of dead weight to balance the 80 lbs. internal pressure nowuniversally used afloat, and also contains an erroneous element ofcalculation, since the relieving power of the valve is directly, as icsdiameter, multiplied into the cosine of the angle of lift measured fromthe horizontal line of valve face and by the relative volume. But asthe velocity of the issuing jet at the orifice of the valve bears a relativeproportion to the relative volume, the density and the pressure, it followsthat only one of those elements need enter into the calculations of theproportions of safety-valves, and the writer
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Keywords: ., bookcentury1800, booksubjectmechan, booksubjectmineralindustries
