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Hot-tap activity

Hot-tap activity

Hot-tap activity

(OP)
We are planning to perform a double hot-tap and stopple on 10" pipe SCH STD with AGO as a process fluid from a distillation tower. The pressure for the process is 54 psi and the temperature is 440°F. The hot-tap company asked us for a maximun velocity through the pipe of 4 feet/sec. We have an internal document called Guidelines for Hot-tap and it is recommended a velocity not greater than 6 ft/sec. Can anybody tell me why we should control the process fluid velocity and what could be the consequences of not doing that?

Best regards,
M.D

RE: Hot-tap activity

In very general terms: With little or no fluid movement you get more decomposition of the fluid; With high fluid velocities you carry weld heat away faster giving more quench = hardness +low toughness. The latter is less of a concern with your 440F, it is more relavent to ambient temp flow lines. My guess is that the Guidlines were written for ambient temp work.

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