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The difference in pressure between two points, usually caused by friction resistance in the pipe, but moisture can also affect it.
Pressure Drop
A relationship for turbulent flow in commercial steel pipes is:
where:
 is 20,000 for rough carbon steel pipe and 23,000 for smooth tubes.
 pressure loss due to friction, psi per 100' of pipe
 is flow rate, lb/hr
 Viscosity, cp
 is the density of the fluid, lb/ft3
 is the, In
This assumes that the flow is fully turbulent which can be determined with Reynolds Number. Another method of determining the frictional pressure drop is the Darcy-Weisbach Equation.
Products
Click below to use our Pressure Drop calculator:
http://www.piping-designer.com/store/calculations/11-pressuredrop-velocity-calculator.html
No. of pages: 34
API Std 600 - Standard for Steel Gate Valves, Flanged and Butt-welding Ends, Bolted Bonnets
This International standard specifies the requirements for a heavy-duty series of bolted bonnet steel gate valves for petroleum refinery and related applications where corrosion, erosion and other service conditions would indicate a need for full port openings, heavy wall sections and large stem diameters.
- This International standard sets forth the requirements for the following gate valve features: bolted bonnet, outside screw and yoke, rising stems, non-rising handwheels, single or double gate, wedge or parallel seating, metallic seating surfaces, flanged or butt-welding ends.
- It covers valves of the nominal pipe sizes NPS: 1; 1 ¼; 1 ½; 2; 2 ½; 3; 4; 6; 8; 10; 12; 14; 16; 18; 20; 24, corresponding to nominal pipe sizes DN: 25; 32; 40; 50; 65; 80; 100; 150; 200; 250; 300; 350; 400; 450; 500; 600, applies for pressure class designations: 150; 300; 600; 900; 1500; 2500.
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