Monday, August 13, 2007
Identical flowrate passing 2" pipes with different pipe schedule (40 & 160), will pressure drop increase on schedule 160 ?
Most of us may already aware of the answer. Pressure drop will increase.
Reason being,
"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.", by Phil LECKNER.
Most of us may already aware of the answer. Pressure drop will increase.
Reason being,
"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.", by Phil LECKNER.
The post has triggered me to create some handy links...
For all pipe sizes the outside diameter (O.D.) remains relatively constant. The variations in wall thickness affects only the inside diameter (I.D.). Details...
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"
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
Pipe Equations
Calculate cross-sectional area, weight of empty pipes, weight of pipes filled with water, inside and outside surface area
If the outside diameter and the wall thickness of a steel pipe is known, the weight per foot can be expressed as:
m = 10.68 (do - tw) tw
where
m = weight per foot (lbs/ft)
do = outside diameter (inches)
tw = wall thickness (inches)
posted by Webworm, 6:11 PM
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