Final answer:
The longitudinal pipe joint factor (Ej) for ERW pipe used in piping systems depends on welding quality and NDE. Ej values, as per ASME B31.1, range from 0.85 to 1.00, with 100% radiography qualifying for an Ej of 1.00. The correct Ej value must be assigned based on pipe specifications and testing to ensure system safety.
Step-by-step explanation:
When an inspector finds that ERW (electric resistance weld) pipe is used in a piping system, the longitudinal pipe joint factor (Ej) that would be used to calculate the required thickness for pressure depends on the quality of the welding and the extent of non-destructive examination (NDE) performed. According to the ASME B31.1 Power Piping Code, for example, typical Ej values for ERW pipes range from 0.85 to 1.00. Pipes that have undergone 100% radiography can qualify for an Ej value of 1.00, indicating full efficiency, whereas pipes that have not been fully radiographed would use a lower Ej value. It is essential for the inspector to verify the correct Ej value based on the specifications and testing performed on the pipe to ensure the safety and integrity of the piping system.