What are the piping requirements in terms of minimum upstream and downstream straight lengths near the orifice element?
The requirement of minimum straight lengths depends on two factors, a) The Beta ratio. The more the beta ratio the more is the requirement of straight lengths, especially more on upstream side. b) The type of disturbance on upstream side, e.g. One elbow in single plane, two elbows in one plane, two elbows in different planes, reducer or expander, regulator or valve operation. It is difficult to tell any thumb rule for straight lengths but knowing the specific case proper straight lengths required on upstream and downstream side can be advised. Requirement of upstream straight length varies between 7D and 24D. The variation of downstream is comparatively much less and varies between 3 to 5 times the internal diameters of pipe (D). Contact on manasmicro@yahoo.com with your specific requirement.
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