Selection of pipe flange types and pressure ratings
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Recently, I designed and manufactured an ammonia buffer tank for a client, with a design pressure of 1.6 MPa and a design temperature of 50°C. Equipped with a safety valve. Questions: 1. Can an SO type be used for the pipe flange? 2. Is it necessary to conduct a leak test on this equipment? 3. A gas-tightness test is required; is it necessary to indicate the maximum allowable operating pressure? 4. A gas tightness test is required, and the maximum allowable operating pressure is specified as 1.68 MPa; the setting pressure for the safety valve is 1.65 MPa. Is it possible to use PN16 for the flange pressure rating? 5. If no safety valve is used, a gas tightness test is still required – is it possible to use PN16 for the flange pressure rating?
1. SO flanges cannot be used. As required on page P16 of the code, welded flanges with necks must be used at minimum. 2. A gas-tightness test is required, as flammable materials can easily cause explosions in the event of a leak. 3. Since a safety valve is present, and a leak test using this safety valve is required, it is advisable to specify the maximum allowable operating pressure ； It is specified in the tolerance regulations. 4. No, your safe starting pressure is higher than the nominal pressure of the flange. Although the nominal pressure of the flange falls within your design pressure range, the actual operating pressure of your container will reach 1.65 MPa. 5. There is something wrong with this question itself. For liquefied petroleum gas media, an explosion-proof device is mandatory. If it is not a device subject to pressure vessel regulations, after specifying the design pressure, the flange can be selected in this way (without a safety valve)
The medium is ammonia, not liquefied petroleum gas... If the medium is compressed air, what should be the answer to question 5?
The flange pressure rating can be PN16
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