Section 5 — Piping

IPE-EP-5-9-1

IPE Engineering Practice IPE-EP-5-9-1

Document number: IPE-EP-5-9-1 · Section: 5 — Piping

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Design and Installation of Non-Metallic Piping STANDARDS AND PUBLICATIONS (CONTINUED) API Publication Pub 941 Steels for Hydrogen Service at Elevated Temperatures and Pressures in Petroleum Refineries and Petrochemical Plants API Standards 15L4 Recommended Practice for Care and Use of Reinforced Thermosetting Resin Line Pipe 15LR Specification for Low Pressure Fiberglass Line Pipe. Applicable to 2 through 12 inch diameter pipe of epoxy or polyester resin for use at cyclic pressures to 1,000 psi. ASME Code B 31.3 Process Piping ASTM Standards D638 Tensile Properties of Plastic, Test method for D1785 Poly (Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120. D2105 Longitudinal Tensile Properties of RTR Pipe and Tube, Test Method for D2241 Poly (Vinyl Chloride) (PVC) Pressure Rated Pipe (SDR Series) D2310 Standard Classification for Machine–Made Reinforced Thermosetting–Resin Pipe D2563 Visual Defects in Glass–Reinforced Plastic Laminate Parts D2924 Test Method for External Pressure Resistance of Reinforced Thermosetting Resin Pipe D2996 Standard Specification for Filament–Wound “Fiberglass” (Glass–Fiber-Reinforced Thermosetting–Resin) Pipe D2997 Standard Specification for Centrifugally Cast Reinforced Thermosetting Resin Pipe D3035 Polyethylene (PE) Plastic Pipe (SDR–PR) Based on Controlled Outside Diameter D3139 Joints for Plastic Pressure Pipe Using Flexible Elastomeric Seals D3754 Standard Specification for “Fiberglass” (Glass–Fiber–Reinforced Thermosetting– Resin) Sewer and Industrial Pressure Pipe D3839 Standard Practice for Underground Installation of “Fiberglass” (Glass–Fiber– Reinforced Thermosetting–Resin) Pipe D4024 Standard Specification for Reinforced Thermosetting Resin (RTR) Flanges F104 Classification System for Nonmetallic Gasket Materials F441 Chlorinated Poly (Vinyl Chloride) (TOSCOVC) Plastic Pipe, Schedules 40 and 80 F442 Chlorinated Poly (Vinyl Chloride) (TOSCOVC) Plastic Pipe (SDR–PR) AWWA Standard C901 Polyethylene (PE) Pressure Pipe, 1/2–inch Through 3–inch, for Water Plastics Pipe Institute PPI Technical Report TR–21 NFPA 255 Standard Method of Test of Surface Burning Characteristics of Building Materials

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Design and Installation of Non-Metallic Piping 7.9 (*)Butterfly type valves shall not be used in plastic piping systems for throttling service due to the danger of nonuniform flow pressure which may cause cavitation in the pipe. Exceptions must be approved by Owner’s Engineer. Butterfly valves in on/off service are acceptable, but gear operators are recommended to prevent hydraulic shock during rapid closing, see EP 5–3–1. 7.10 Support, anchor and guide design shall be in accordance with the plastic pipe Manufacturer’s recommendations for the specific plastic pipe being considered. The particular application of the selected plastic pipe and its installation environment shall enter into the Manufacturer’s recommendations for the design. 7.11 To avoid point loads on non–metallic piping, all supports, anchors, and guides shall have a minimum support width shown in Table 2. Saddles (made of FRP, PVC, Rubber or Galvanized Sheet Metal) may be required to meet the support width of Table 2. 7.12 Transition joints shall be in accordance with the plastic pipe Manufacturer’s recommendations for transitioning from plastic pipe to other piping systems. The mating connection terminating the other piping system shall comply with the applicable Coastal Aruba Engineering Practice for that particular type piping, except that raised face flanges shall not be used. 7.13 Physical Property Data used in the design of plastic piping systems shall be in accordance with the Manufacturer’s published data and the ASTM standards applicable to the specific plastic pipe selected. System design considerations shall include safety factors set forth herein and as recommended by the plastic pipe Manufacturer. The more stringent safety factor shall take precedence in design calculations. 7.14 (*)Heat tracing of plastic pipe shall be designed and installed based on the plastic pipe Manufacturer’s recommendations. The method of heat tracing shall be compatible with the selected plastic pipe material. Electric heat tracing cable shall be the parallel–resistance constant watt type for 120–240 volts. Use of electric heat tracing on plastic requires prior approval by the Owner’s Engineer. 7.15 Calculations and design for plastic piping systems for water hammer control shall be according to the Manufacturer’s recommendations for the specific plastic pipe material selected. The plastic pipe system design shall consider system operation in selecting fluid velocity and valve operating time. All plastic piping systems operating at fluid velocities greater than 2 ft/sec. shall be investigated for over–pressurization due to water hammer and surge pressures. Note that RTR, PVC and TOSCOVC pipe systems are more susceptible to damage from surge pressures and cyclic overpressures than other thermoplastic pipe systems. Careful consideration should be given to hoop–stress in plastic piping systems resulting from overpressure cycling. 7.16 External pressure exerted on plastic pipe is the sum of negative internal pressure plus external pressure resulting from soil and/or hydraulic pressures. Selection of plastic pipe for safe external pressure loading shall limit material strain to less than 2 percent in all cases. The design factor of safety of four (4) shall be used for all plastic pipe subjected to external pressure. The plastic pipe Manufacturer’s published data for design limitations and ASTM D 2924 shall be consulted and reviewed. External pressure design calculations shall include the following considerations: 1) Supported or unsupported plastic pipe installation. (Supported generally refers to an envelope of soil or other total restraint around the pipe.) 2) Pipe burial depth and compaction of fill around pipe (using only recommended fill material). 3) Elevation of water table.

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Design and Installation of Non-Metallic Piping TABLE 3 (CONT’D) WATER PRESSURE RATINGS AT 73°F FOR SCHEDULE 120 PVC PIPE (REPRODUCED FROM ASTM D1785 FOR CONVENIENCE) Pressure Ratings (1) Nominal PVC 1120 PVC 2116 PVC 2112 PVC 2110 Pipe Size PVC 1220 PVC 2120 inch psi 1/2 1010/510 810/410 630/320 510/250 3/4 770/390 620/310 480/320 390/190 1 720/360 570/290 450/220 360/180 1–1/4 600/300 480/240 370/190 300/150 1–1/2 540/270 430/210 340/170 270/130 2 470/240 380/190 290/150 240/120 2–1/2 470/230 370/190 290/150 230/120 3 440/220 360/180 280/140 220/110 3–1/2 380/190 310/510 240/120 190/100 4 430/220 340/170 270/130 220/110 5 400/200 320/160 250/120 200/100 6 370/190 300/150 230/120 190/90 8 380/180 290/140 230/110 180/90 10 370/180 290/140 230/110 180/90 12 340/170 270/140 210/110 170/80 (1) These pressure ratings apply only to unthreaded/threaded pipe respectively.

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