Give two short questions to liven up the atmosphere
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1. In the GB150-1998 standard, the calculation formula for the internal pressure on a cylinder at the design temperature, δ=PDi/2tφ-P, is applicable to the design of steel pressure vessels with a design pressure not exceeding 35 MPa. ( ) 2. During pressure testing, the membrane stress in the cylinder of a pressure vessel shall not exceed 90% of the material’s yield strength σs (σ0.2) at the test temperature. ( ) This post was last edited by langyan on 2009-2-17 10:19 ]
1. Wrong. It seems there is also a minimum value. 2. Wrong. There is no distinction between pneumatic and hydraulic pressure
1. Wrong. The mistake lies not in design stress but in calculation stress; it’s not the scope of application of GB150 that matters, but rather the fact that the calculation stress should not exceed 0.4 * allowable stress * welding joint factor, or in other words, Do/Di should not be greater than 1.5. 2. Wrong. It’s true that it’s not clear whether it’s hydraulic or pneumatic.
1. Wrong. It is suitable for operating conditions with a design pressure not exceeding 35 MPa but equal to or greater than 0.1 MPa. 2. Wrong. The hydraulic test score is 90%, and the pneumatic test score is 80%.
1. In the GB150-1998 standard, the calculation formula for the internal pressure on a cylinder at the design temperature, δ=PDi/2tφ-P, is applicable to the design of steel pressure vessels with a design pressure not exceeding 35 MPa. ( X ) 2. During pressure testing, the membrane stress in the cylinder of a pressure vessel shall not exceed 90% of the material’s yield strength σs (σ0.2) at the test temperature. (X)
1. In the GB150-1998 standard, the calculation formula for the internal pressure on a cylinder at the design temperature, δ=PDi/2tφ-P, is applicable to the design of steel pressure vessels with a design pressure not exceeding 35 MPa. ( X ) This reason applies to conditions where the design pressure is not greater than 35 MPa but is greater than or equal to 0.1 MPa. 2. When a pressure vessel is subjected to a pressure test, the membrane stress in its cylinder shall not exceed 90% of the material’s yield strength σs (σ0.2) at the test temperature. (X) The reason is that the hydraulic test score is 90%, while the pneumatic test score is 80%.
1.(X) Applicable to operating conditions where the design pressure is not greater than 35 MPa but is greater than or equal to 0.1 MPa. 2.(X) The hydraulic test score is 90%, and the pneumatic test score is 80%. I think that’s the case.
1.(X) 2.(X) I won’t explain the reason. It has been explained in full above.
What the original poster meant is probably what was said on the 4th and 7th floors, but it wasn’t expressed in a comprehensive manner; so both views are correct.
My answer: 1.(X) Applicable to conditions where the design pressure is not greater than 35 MPa but is greater than or equal to 0.1 MPa. 2.(X) The hydraulic test score is 90%, and the pneumatic test score is 80%.
1. Wrong (incorrect pressure, conditions for applying the formula). 2. Wrong (hydraulic or pneumatic?)
1) X P is less than or equal to 0.4 * allowable stress * welding joint factor. 2) X is 90% for hydraulic testing and 80% for pneumatic testing
1. In the GB150-1998 standard, the calculation formula for the internal pressure on a cylinder at the design temperature, δ=PDi/2tφ-P, is applicable to the design of steel pressure vessels with a design pressure not exceeding 35 MPa. (×) 2. During pressure testing, the membrane stress in the cylinder of a pressure vessel shall not exceed 90% of the material’s yield strength σs (σ0.2) at the test temperature. (×)
1. (X) This reason applies to situations where the design pressure is not greater than 35 MPa but is greater than or equal to 0.1 MPa. 2. (X) The acceptance rate for hydraulic testing is 90%, while it is 80% for pneumatic testing.
1. In the GB150-1998 standard, the calculation formula for the internal pressure on a cylinder at the design temperature, δ=PDi/2tφ-P, is applicable to the design of steel pressure vessels with a design pressure not exceeding 35 MPa. ( × ) 2. During pressure testing, the membrane stress in the cylinder of a pressure vessel shall not exceed 90% of the material’s yield strength σs (σ0.2) at the test temperature. (×)
1. In the GB150-1998 standard, the calculation formula for the internal pressure on a cylinder at the design temperature, δ=PDi/2tφ-P, is applicable to the design of steel pressure vessels with a design pressure not exceeding 35 MPa. ( X ) 2. During pressure testing, the membrane stress in the cylinder of a pressure vessel shall not exceed 90% of the material’s yield strength σs (σ0.2) at the test temperature. (X)
1. (X) This applies to conditions where the design pressure is not greater than 35 MPa but is greater than or equal to 0.1 MPa. 2. (X) Because the hydraulic test requirement is 90% and the pneumatic test requirement is 80%.
1.(X) Applicable to operating conditions where the design pressure is not greater than 35 MPa but is greater than or equal to 0.1 MPa. 2.(X) The hydraulic test score is 90%, and the pneumatic test score is 80%.