Could anyone tell me how is defined the allowable stress for hydrotest condition in PVElite? Is it defined in some paragraph of ASME Code?

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Hi SHCavata,
Here i am giving explanation
The equipments and pipes are made of elastic materials like MS,CS and SS.In most of the cases a defined yield point is available while testing them.Since all the designs are based on elastic design ie stresses will be with in elastic limit.Workin stresses and allowable stresses are determined by using a factor of safety which generally varies between 1.67 to 2Allowable

Stress at Hydrotest Temperature
Enter the allowable stress for the element material at Hydrotest temperature. (Operating temperature for most vessel will be 40 F or 70 F or 10 C). You can calculate this value in the ASME Code, Section II, Part D, Table 1A, 1b, and 3.

Most time the allowed hydrotest stress will just be 1.5 times the allowable stress for the vessel at ambient temperature. Under some circumstances you may choose to use an allowable hydrotest stress of 0.9 times the yield stress of the material at ambient temperature. This is especially helpful in the case of tall vertical process tower where the hydrotest pressure is increased by height of the water used for testing. Use of the higher hydrotest allowable stress may prevent the hydrotest case from controlling the thickness of the vessel.
Under normal circumstance, the program will calculate this allowable stress for you. If you enter a valid material name in the material input field, the program will look into its database and determine the allowable stress for the material at ambient temperature, multiply it by 1.5, and enter it into this cell. As of version 3.2, the program will also check the value of 0.9 times the ambient yield stress. It will then compare the two numbers and choose the minimum of the two for this allowable stress. The program will also calculate this stress when you select a material name from the material selection window.
Regards,
Yesu Reddy