Engineering Handbook for Industrial Plastic Piping Systems by David Chasis
By David Chasis
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Extra info for Engineering Handbook for Industrial Plastic Piping Systems
The pressure temperature correction chart (Table 28) used to adjust pipe pressure ratings may be used for this purpose. (See note below table). 8 NOTE: These are short-term ratings; long-term ratings should be reduced by 1/3 to 1/2 of the short-term ratings. THERMOPLASTIC ENGINEERING EXTERNAL PRESSURES - COLLAPSE RATING Thermoplastic pipe is frequently specified for situations where uniform external pressures are applied to the pipe, such as in underwater applications. In these applications, the collapse rating of the pipe determines the maximum permissible pressure differential between external and internal pressures.
B BURNING CLASS UL 94 BURNING RATE ASTM - D635 —- 5/32” STEEL LIMITED OXYGEN index (%) ASTM - D2863-70 THERMAL CONDUCTIVITY BTU/hr/sq. ft/°F/in. 0 * —- V-0 —- —- 33 V-0 —- * * 60 V-O —- —- —- —- —- —- * Self-Extinguishing 41 FOR SERVICE, PLEASE CALL 1-800-877-HIPCO SYSTEMS ENGINEERING DATA FOR THERMOPLASTIC PIPING INTRODUCTION In the engineering of thermoplastic piping systems to comply with the Uniform Building Code, Uniform Fire Code, Uniform Mechanical Code, and Uniform Plumbing Code, it is necessary to have not only a working knowledge of piping design, but also an awareness of the unique properties of thermoplastics.
The relationship of stress, pressure, and pipe dimensions is described by the ISO (International Standardization Organization) equation. In various forms this equation is: P = 2S = R-1 2S = R - 1 P 2St D0 - t 2S = P D0 t -1 S = P(R - 1) 2 Where: P = Internal Pressure, psi S = Circumferential Stress, psi t = Wall Thickness, in. D0 = Outside Pipe Diameter, in. R = D0/t LONG-TERM STRENGTH To determine the long-term strength of thermoplastic pipe, lengths of pipe are capped at both ends (see Figure 5) and subjected to various internal pressure, to produce circumferential stresses that will produce failure in from 10 to 10,000 hours.