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unt of changed conditions may be installed on the piping between the boiler and the main stop valve except when the boiler is equipped with a superheater or other piece of apparatus. In the latter case they may be installed on the piping between the boiler drum and the inlet to the superheater or other apparatus, A09 A09 A-45 When boilers of different maximum allowable working pressures with minimum pressure relief valve settings vary- ing more than 6% are so connected that steam can fiow toward the lower pressure units, the latter shall be protected by additional pressure relief valve capacity, if necessary, on the lower pressure side of the system.
The additional safety valve capacity shall be based upon the maximum amount of steam that can fiow into the lower pressure system. The additional pressure relief valves shall have at least one valve set at a pressure not to exceed the lowest 168 provided that the piping between the boiler and pressure relief valve (or valves) connection has a cross-sectional area of at least three times the combined areas of the inlet connections to the pressure asme bpvc section iv relief valves applied to it. A-63 A-63.2 During a hydrostatic test of a boiler, the safety valve or valves shall be removed or each valve disk shall be held to its seat by means of a testing clamp and not by screwing down the compression screw upon the spring. 2007 SECTION I FIG. A-66 EXAMPLE FOR TYPICAL NOZZLE COMPUTATIONS 41/4 in. dia WL1 = 3/8 in. 8 31/2 in. 8 8 Limits of reinforcements 2 in. 4 3 in. NPT 51/4 in. O.D. Lip WL3 = 3/8 in. GENERAL NOTE: This example was performed using computer software.
The example was generated by performing the entire calculation without rounding off during each step. Accuracy of the final results beyond three significant figures is not intended or required. A-64 REPAIRS TO EXISTING BOILERS A-65 Where repairs are necessary that in any way affect the working pressure or safety of a boiler, a state inspector, municipal inspector, or an inspector employed regularly b
