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I had thought I posted again with more details, but I can't find it, so I'll try again. Sorry for not putting all of this in the OP. The flow measurement device is a smooth-approach orifice. The throat is perhaps 7" in diameter (don't recall exactly), and the main duct is 18" in diameter...

>Agreed, the second post needs explaining. OK, here's what I've got: 18" diameter duct. 180-inch-long straight section, upstream end open to atmosphere, downstream end connected to flow meter. Downstream of the meter, there is a 90-inch-long straight section, and then there's a blower...

>Are you asking about positioning the flow meter >at a greater distance than 10/5 from a flow disturbance? The specific case I'm thinking of is a flow meter with ten diameters of straight pipe upstream, with the upstream end of that pipe (the inlet) open to atmosphere. I'm wonder what sort of...

There's a rule of thumb that says a flow meter requires ten diameters of straight pipe upstream, and five diameters of straight pipe downstream in order to provide "clean" flow at the meters inlet/outlet. This rule is often printed explicitly in the installation manuals for commercially...

The basic rule for the design of threaded joints is that six turns of thread engagement provides very nearly the maximum strength possible, as described here: http://www.gizmology.net/nutsbolts.htm Presumably this applies when the materials for the male and female thread have similar...

Thanks for the book recommmendation; I have put in an order for a copy. Unfortunately I don't get to choose the meters; I'm stuck with the UFM and the SAO. In the normal operating configuration, the UFM has ten diameters of pipe upstream of it. This length of pipe is preceded by a...

Greetings - I have an ultrasonic flow meter (UFM) in an 18" pipe that I need to calibrate. I have a NIST-traceable smooth-approach orifice (SAO) that I intend to use for this purpose. I am wondering what's required to assure fully developed/unperturbed flow through each of these devices. The...