API-RP-576
API ICP Self Study Notes API ICP Self Study Notes
Types Mediums Limitations Safety-relief Valve Full lift; Liquid 10% or 25% overpressure, Gas/Vapor phase 10% overpressure Conventional Safety-relief Valve. All phases Valves should not be used; : 1. total built-up backpressure exceeds the allowable overpressure. 2. (CDTP) cannot be reduced to account for the effects of variable backpressure. 3. ASME BPVC Section I steam boiler drums & superheaters. 4. as pressure control or bypass valves. Whose operational characteristics are directly affected by changes in the backpressure. Bonnet is pressure-tight cavity and is vented to the discharge side of the valve. Balanced Safetyrelief Valve. All phases valves should not be used: 1. on ASME BPVC Section I steam boiler drums or ASME BPVC Section I superheaters, and 2. as pressure control or bypass valves. valve that incorporates a bellows or other means for minimizing the effect of backpressure on the operational characteristics of the valve. The bonnet may or may not be pressure tight. Used where high backpressures are present at the valve discharge. Fion Zhnag/ Charlie Chong
4.6 Conventional Safety-relief Valve 4.6.1 General A conventional safety-relief valve is a direct spring-loaded pressure-relief valve whose operational characteristics (opening pressure, closing pressure, and relieving capacity) are directly affected by changes in the backpressure (see Figure 4). A conventional safetyrelief valve has a bonnet that encloses the spring and forms a pressure-tight cavity. The bonnet cavity is vented to the discharge side of the valve. 4.6.2 Applications Conventional safety-relief valves can be used in refinery and petrochemical processes that handle flammable, hot, or toxic material. The effect of temperature and backpressure on the set pressure is considered when specifying conventional safety-relief valves. Fion Zhnag/ Charlie Chong
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Types<br />
Mediums<br />
Limitations<br />
Safety-relief Valve<br />
Full lift; Liquid 10% or 25% overpressure, Gas/Vapor phase 10% overpressure<br />
Conventional<br />
Safety-relief Valve.<br />
All phases<br />
Valves should not be used; :<br />
1. total built-up backpressure exceeds the allowable overpressure.<br />
2. (CDTP) cannot be reduced to account for the effects of variable<br />
backpressure.<br />
3. ASME BPVC Section I steam boiler drums & superheaters.<br />
4. as pressure control or bypass valves.<br />
Whose operational characteristics are directly affected by changes in the backpressure.<br />
Bonnet is pressure-tight cavity and is vented to the discharge side of the valve.<br />
Balanced Safetyrelief<br />
Valve.<br />
All phases<br />
valves should not be used:<br />
1. on ASME BPVC Section I steam boiler drums or ASME BPVC Section I<br />
superheaters, and<br />
2. as pressure control or bypass valves.<br />
valve that incorporates a bellows or other means for minimizing the effect of backpressure<br />
on the operational characteristics of the valve. The bonnet may or may not be pressure<br />
tight. Used where high backpressures are present at the valve discharge.<br />
Fion Zhnag/ Charlie Chong
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