5 replies to this topic

[dylant]

Does anyone have the flow of water through schedule 160 pipe (CS) engineering data? Crane Technical Paper 410 only shows the one for schedule 40.

Thanks in advance.

[latexman]

If you look at the text between the water flow and air flow tables and on the air flow table page, it tells you how to correct for other than schedule 40 pipe. It applies to both water and air flow, within reason.

[dylant]

Latexman:

Thanks for the clarification. Apparently, I've skipped that portion.

I have a question. Let's say we have 10 GPM of water flowing through a 2 in pipe (CS, Sch 40) has a velocity of 2 ft/s and dP 2 psi. If the same water (same flowrate, same temperature, same composition) is flown through a CS, Sch 160 pipe (same pipe material and velocity of 2 ft/s) will it have the same dP?

Technically it should have the same dP of 2 psi, am I right? Because we do not change any single variable. The only change is the schedule of the pipe. Schedule = thickness of the pipe, it does not change the cross sectional area of the pipe, thus it should not matter.

Thanks, Dylan.

[pleckner]

The OD of the pipe is basically fixed (+ or -) but as you have already determined, the schedule number is related to the thickness, with the higher numbers indicating thicker pipe, smaller pipe ID and therefore a smaller cross sectional area of the flow path. A 2" pipe has a fairly constant OD of 2.375". The 2" schedule 40 pipe has an ID of 2.067" but a 2" schedule 160 pipe has an ID of 1.687". Obviously the schedule 160 pipe has a smaller flow path than does the schedule 40 pipe and thus for your example the velocity (and pressure drop) will be greater in the schedule 160 pipe.

Suggest you continue reading CRANE TP 410, specifically see the Pipe Data charts starting on page B-16.

[dylant]

That makes sense now. Thanks, Phill.

[JoeWong]

For the benefits of all...

What's PIPE Schedule ?
For all pipe sizes the outside diameter (O.D.) remains relatively constant. The variations in wall thickness affects only the inside diameter (I.D.).

NPS - "Nominal Pipe Size" and DN - "Diametre Nominel"
The size of pipes, fittings, flanges and valves are often given in inches as NPS - Nominal Pipe Size, or in metric units as DN - "Diametre Nominel"

Pipe Data CHART
Carbon, Alloy and Stainless Steel Pipes - ASME/ANSI B36.10/19
Pipe sizes, inside and outside diameters, wall thickness, schedules, moment of inertia, transverse area, weight of pipe filled with water - U.S. Customary Units

JoeWong