High performance safety valve for the protection of large boilers and ...

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Steam safety valve 9100accessoriesThe 9100 safety valves are delivered with an hydrostatic test plug. This plug has to be fitted inlieu of the disc if it is required to hydrotest the boiler with the safety valves in place. It is alsorecommended to let this plug in the valve when welding the BW on the boiler outlet nozzle.The hydrostatic test plug has to be used together with the locking gag fixture. The purpose of thisfixture is to maintain the spindle of the valve in the closed position.Weather shield is also available for spring protection.Lapping tools are available for seat reconditioning.Plug for hydrostatic testLocking gagAdjusting screwLock nutYokePentair reserves the right to change the contents without notice page 4
Steam safety valve 9100safety valve selectionSizingThe safety valve is defined by its orifice size. The orifice sizes are designated by figurescorresponding to orifice areas between 2.85cm 2 / 0,44sq.in. and 129.3cm 2 / 20sq.in.Orifice -0 -1 -2 -3 -4 -5 -8 -6 -7 -9cm 2 2.85 6.40 9.25 16.50 25.30 45.80 47.48 71.20 103.25 129.30sq.in. 0.44 0.99 1.43 2.56 4.00 7.10 7.36 11.03 16.00 20.00Knowing the required flow capacity of the valve at the desired set pressure, the orifice size can bedetermined either by using the capacity tables on pages 9 to 11 (kg/hr) or Pages 12 to 14 (Ibs/hr) orby calculation:Metric units:A ≥ ____________________________q m52.5 x P x K D x K A x K SH x K NUS customary units:A ≥ ______________________________q m51.45 x P x K D x K A x K SH x K Nwhere:Symbol Designation Metric Unit US customaryA Orifice area cm 2 sq.in.q v Valve flow rate kg/h lbs/hrq m Required flow rate kg/h lbs/hrP Relieving pressure, abs. bar abs psiaα Overpressure % %SP Set pressure bar psigK D Discharge coefficient 0.938 0.938K A Derating coefficient 0.9 0.9K SH Superheat correction factor Table 4 Table 4K NNapier coefficientP = Set Pressure + Overpressure + Atmospheric Pressure( )P = 1 + _____ ax SP + 1.013100(bar abs.) or( )P = 1 + _____ ax SP + 14.7100α = overpressure, 3% (ASME Section I) or 10% (according to regulation)(psia)K SH = obtained from page 15 for superheated steam.K SH = 1.00 for saturated steamK N = NAPIER correction factorK N = 1.00 for up to 103 bar/1500 psigbeyond :K N = _________________2.7644 x P - 10003.3242 x P - 1061(metric)K N = _________________0.1906 x P - 10000.2292 x P - 1061(US customary)Valve flow rate :q v = 52.5 x A x P x K D x K A x K SH x K Nq v = 51.45 x A x P x K D x K A x K SH x K N(metric)(US customary)Dimensions and weightsRefer to page 7 for dimensional data andvalve inlet x outlet sizes.Pressure/temperature ratingWhen the orifice size has been selected, refer to page 8 to select the correct valve ratingcorresponding to the orifice size, the set pressure and the temperature.Pressure ratings are based on ASME B16.34.- type 9104 = CI.600lbs- type 9105-6 = CI. 900lbs- type 9107 = CI.1500lbs- type 9108 = CI. 2500lbs- type 9109 = CI. 3000lbsPentair reserves the right to change the contents without notice page 5
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