1. Scope
1.1 This standard covers Plastic Lined Piping Systems pipe and fittings to be lined with Polypropylene, PP, Kynar, PVDF, Halar, ECTFE, Tefzel ETFE or Teflon PTFE and PFA.
2. Materials and Manufacturing Standards
2.1 Pipe shall be carbon steel schedule 10 through 80, schedule 40 ERW standard. Maximum length is 20'-0". Ductile iron, galvanized or stainless steel special order.
2.2 Pipe grade may be ERW (electric resistance welded) ASTM A-587, low carbon steel for the chemical industry, A-53 or A-106 seamless, unless otherwise specified.
2.3 Pipe flanges shall be cast iron, ductile iron or forged steel (galvanized or stainless steel special order). All dimensions meet ANSI B 16.1, 16.42, or 16.5.
2.3.1 125 lb. ANSI cast iron flanges shall conform to ASTM A-48, A-126, or A-278. Lap joint or threaded.
2.3.2 150 lb. ANSI ductile iron flanges shall conform to ASTM A-395 or A-181. Lap joint, threaded or weld type.
2.3.3 150 lb. and 300 lb. ANSI, or higher pressure rated forged steel flanges shall conform to ASTM A-105 or A-181. Lap joint, Threaded or weld type.
2.4 Fittings shall be castings or fabricated steel with applicable flanges, in accordance with paragraph 2.3.
2.4.1 125 lb. ANSI cast iron fittings shall conform to ASTM A-126.
2.4.2 150 lb ANSI cast ductile iron fittings shall conform to ASTM A-395 or 536 or be fabricated from schedule 40 carbon steel pipe, using accepted industry processing methods, i.e.: cold van stone flaring, bending, welding, etc. Flanges shall be lap joint ductile iron as described in paragraph 2.3.2.
2.4.3 150 lb. and 300 lb. ANSI cast steel fittings shall conform to ASTM A-216 or be fabricated from standard forged steel weld fittings or schedule 40 carbon steel pipe in accordance with ASTM A-234 and accepted industry processing methods, i.e.: cold van stone flaring, bending, welding, etc. Flanges shall be forged steel lap joint or weld type as described in paragraph 2.3.3.
2.5 Linings employed in both pipe and fittings shall have the minimum uniform wall thickness ranging from .125 to .400 dependent on the liner used.
2.6 All linings must be seamless and homogeneous.
2.6.1 Plastic shall be mechanically swaged into pipe or molded in place only after the fitting or pipe is cast or completely fabricated.
2.6.2 Bending, blowing, thinning or distorting the lining in any way is not permitted.
2.6.3 Flaring or maching of the plastic face is to be performed only after the lining is temperature compensated and stabilized by cycling each pipe spool or fitting from ambiend through its temperature range.
3. Quality Assurance and Inspection
3.1 All pipe and fittings shall be visually inspected for any imperfections prior to lining.
3.2 Interior of pipe and fittings shall be smooth, clean and free of burrs or other imperfections. All corners in contack with the lining are to be radiused and welds ground smooth (1/8" radius minimum).
3.3 All welding operations must be performed prior to welding.
3.4 After lining, all pipe and fittings must individually pass a minimum of 10,000 volt non-destructive electrostatic spark test.
3.5 That portion of the lining forming the flange gasket sealing surface shall be free of scratches, dents or any defect measuring greater than 10% of the lining thickness.
3.6 After thorough inspection, all fittings and pipe spools shall have the plastic raised face protected with minimum 1/2" thick plywood end covers bolted in place. The covers should not be removed until the pipe or fitting is ready for installation. If protective covers are removed for inspection, they should be replaced as soon thereafter as possible.
ASTM - F1545-97 Specification