Baker Hughes Consolidated 1982 Series, Инструкция по эксплуатации

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Consolidated 1982 Series Safety Relief Valve Manual
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Examples of Cold Differential Set Pressure Calculations
(a) Set pressure 255 psig (17.58 barg), temperature 300ºF
(148.9ºC), back pressure atmospheric.
Set Pressure ................................ 255 psig (17.58 barg)
Multiplier (see Table 5) ....................................... X1.006
Cold Differential Set Pressure ............256.5 psig (17.69)
(b) Set pressure 255 psig (17.58 barg), temperature 300ºF
(148.9ºC), constant pressure 15 psig (1.03 barg).
Set Pressure ................................ 255 psig (17.58 barg)
Minus Constant Back Pressure ...... -15 psig (-1.03 barg)
Differential Pressure ..................... 240 psig (16.55 barg)
Multiplier (see Table 5) ........................................ X1.006
Cold Differential Set Pressure ............241.4 psig (16.64)
(C) Set pressure 255 psig (17.58 barg), temperature 100ºF
(37.8ºC), constant back pressure 15 psig (1.03 barg).
Set Pressure ................................ 255 psig (17.58 barg)
Minus Constant Back Pressure ...... -15 psig (-1.03 barg)
Differential Pressure ..................... 240 psig (16.55 barg)
Multiplier (see Table 5) ........................................ X1.003
Cold Differential Set Pressure ............240.7 psig (16.60)
The Table 5 can be used for set pressure adjustment
of valves with operating temperatures from 251ºF
(121.7ºC) to 800ºF (426.7ºC).
XIII. Setting and Testing (Cont.)
Table 5: Set Pressure
Multipliers for Cold
Differential Set Pressure
Operating Temperature
Multiplier
°F °C
250 121.1 1.003
300 148.9 1.006
350 176.7 1.009
400 204.4 1.013
450 232.2 1.016
500 260.0 1.019
550 287.8 1.022
600 315.6 1.025
650 343.3 1.028
700 371.1 1.031
750 398.9 1.034
800 426.7 1.038