based on ASME B31.1 Table 136.4 which any joint its temperature is over 400 centigrade degree shall be under radiographic examination for pipe size above 2".For pipe size below 2", is it a good engineering practice to provide 100% RT regardless of pipe size.
for the moment I only provide a...
does the motorized valve always came with hand wheel also. I just queries, that what will happen if the motorized valve don't work & can it open manually ?
1-why all the manual valve shall be of external shaft and can be closed turning the wheel clockwise when in front of the wheel
2-why all the butterfly valves may be set in both, closed or open position, evan with the actuator & mechanism disassembled ?
