ASTM F781-95

1.1 This specification covers factory-made perfluoro (alkoxyalkane) copolymer (PFA) plastic-lined ferrous metal pipe and fittings, primarily intended for conveying corrosive liquids and gases. Requirements for materials, workmanship, dimensions, design, construction, working pressures and temperatures, test methods, and markings are included.

1.2 The values given in parentheses are provided for information purposes only.

Note 1-This specification does not include products coated with PFA nor does it define the suitability of PFA-lined components in chemical environments.

1.3 The ferrous piping products shall meet the requirements of the relevant specification listed in 1.3.1 through

1.3.4. Nominal sizes from 1 through 12 in. in 150 and 300 psi (1.0 to 2.0 MPa) ratings are covered.

Note 2-The PFA sealing faces may prevent achievement of the full pressure rating of the ferrous housings. For pressure limitations, the manufacturer should be consulted.

1.3.1 For Ferrous Pipe:

ASTM Title of Specification Designation Pipe, Steel, Black, and Hot-Dipped, Zinc-Coated Welded and Seamless A 53 Seamless Carbon Steel Pipe and High-Temperature Service A 106 Electric-Resistance-Welded Steel Pipe A 135 Electric-Welded Low-Carbon Steel Pipe for the Chemical Industry A 587 Seamless and Welded Austenitic Stainless Steel Pipe A 312

1.3.2 For Ferrous Flanges:

ASTM Title of Specification Designation Forgings, Carbon Steel, for Piping Components A 105 Forged or Rolled Steel Pipe Flanges, Forged Fittings and Valves and Parts for General Service A 181 Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service A 182 Carbon-Steel Castings Suitable for Fusion Welding for High-Temperature Service A 216 Ferritic Ductile Iron for Pressure Retaining Castings for Use at Elevated Temperatures A 395 Ductile Iron Castings A 536

1.3.3 For Ferrous Fittings:

ASTM Title of Specification Designation Forgings, Carbon Steel, for Piping Components A 105 Forged or Rolled Steel Pipe Flanges, Forged Fittings, and Valves and Parts for General Service A 181 Carbon Steel Castings Suitable for Fusion Welding for High-Temperature Service A 216 Piping Fittings Wrought Carbon Steel and Alloy Steel for Moderate and Elevated Temperatures A 234 Austenitic Steel Castings for High-Temperature Service A 351 Alloy Steel Castings Specially Heat-Treated for Pressure Contained Parts Suitable for High-Temperature Service A 389 Ferritic Ductile Iron for Pressure Retaining Castings for Use at Elevated Temperatures A 395 Ductile Iron Castings A 536 Ductile Iron for Pressure Containing Castings for Use at Elevated Temperatures A 403

1.4 The PFA-lined flanged pipe and fitting assemblies are limited to use from -20 to 500°F (-29 to 260°C). For use below -29°C (-20°F) consult the manufacturer.

Note 3-The above temperature limitations are based on noncorrosive test conditions. Use in specific aggressive environments may alter the above temperatures, and these limits shall be established by mutual agreement between the purchaser and manufacturer.