Emerson S200 Arkusz Danych Pobierz pdf (Strona 12)

Bulletin 71.1:S200

Figure 9. Type S206 Regulator with Low Outlet Pressure

Shutoff and Internal Relief









Figure 10. Minimum Inlet Pressure Required to Prevent

Shutoff on all Sizes of Types S204, S204H, S206, and S206H

Regulators at Indicated Flow









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

  

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2.0

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   





















Overpressuring any portion of a regulator or associated

equipment may cause personal injury, leakage, or

property damage due to bursting of pressure-containing

parts or explosion of accumulated gas. Provide

appropriate pressure relieving or pressure limiting

devices to ensure that the limits in the Specications or

Table 4 are not exceeded. Regulator operation within

ratings does not prevent the possibility of damage from

external sources or from debris in the pipeline.

Refer to the relief sizing coefcients and the Capacity

Information section to determine the required relief

valve capacity.



Tables 7 through 11 give the natural gas regulating

capacities of S200 Series regulators at selected inlet

pressures and outlet pressure settings. Flows are

in SCFH (60°F and 14.7 psia) and Nm

/h (0°C and

1.01325 bar) of 0.6 specic gravity natural gas. To

determine equivalent capacities for air, propane,

butane, or nitrogen, multiply the SCFH table capacity

by the following appropriate conversion factor: 0.775

for air, 0.628 for propane, 0.548 for butane, or 0.789

for nitrogen. For gases of other specic gravities,

multiply the given capacity by 0.775, and divide by the

square root of the appropriate specic gravity.

—Use this equation

(absolute outlet pressure equal to one-half or less than

one-half the absolute inlet pressure).

Q = P

1(abs)

(1.29)

—Use this equation

(absolute outlet pressure greater than one-half of

absolute inlet pressure):

Q = C

SIN DEG

520 3417

GT C

where:

Q = gas ow rate, SCFH

= gas sizing coefcient

= absolute inlet pressure, psia

G = specic gravity of the gas

T = absolute temperature of gas at inlet, °Rankine

= ow coefcient

P = pressure drop across the regulator, psi



These regulators may be installed in any position. If

gas escaping through the internal relief valve could

constitute a hazard, the vent must be piped to a

location where escaping gas will not be hazardous. In

this case, obstruction-free tubing or piping of at least

the same diameter as the vent size with a minimum

number of bends should be used, and a screened vent

should be installed on the end of the vent pipe. On all

installations, the vent or the end of the vent pipe must

be protected from anything that might clog it.





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1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 31 32

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