P. O. Box 1104
Anaconda, MT 59711
ph: (406) 563-5186
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Three Important Formulas
Reference: Marks Standard Handbook for Mechanical Engineers, Eighth Edition, 1978
Valve and Port Sizes Flow area of valves and cross section of ports are usually determined by port area = AS/C in2, where A is net piston area, in2, S is mean piston speed, ft/min, and C is a constant, ft/min. Values of C are approximately 9,000 to 15,000 ft/min for inlet and 6,000 to 7,000 ft/min for outlet. Small valves and ports represent lost work.
Reference: Marks Mechanical Engineers Handbook, Fourth Edition, 1941, page 325
Isentropic Expansion of Superheated Steam
The isentropic expansion of superheated steam is fairly represented by
pvn = const, with n = 1.315.
The volume at the end of expansion is V2 = V1(p1/p2)1/n
Reference: RYERSON, Joseph T. Ryerson & Son, Inc., Steel, Special Metals, Spokane, Washington, Edition 121, pages 135 and 138
Bursting Pressures, Steel Fluid Line Tubing
Per Barlows Formula Burst P = 2ST D
S = Allowable Fibre Stress, T = Wall Thickness, D = O.D.
S is the tensile strength in PSI. One must consult RYERSON STEEL & ALUMINUM DATA BOOK for specifications, properties, etc.
Copyright 2012 COZBY ENTERPRISES, INC.. All rights reserved.
P. O. Box 1104
Anaconda, MT 59711
ph: (406) 563-5186
alt: (406) 560-0118
fbcanaco