ASTM F781-95

Standard Specification for Perfluoro (Alkoxyalkane) Copolymer (PFA) Plastic-Lined Ferrous Metal Pipe and Fittings (Withdrawn 2004)

SCOPE
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.
WITHDRAWN RATIONALE
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.
Formerly under the jurisdiction of Committee F17 on Plastic Piping Systems, this specification was withdrawn in July 2004. This (test method, practice, specification, guide, terminology) was withdrawn in (month and year) in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-1994
• Withdrawal Date: 19-Jul-2004
• ICS: 23.040.10 - Iron and steel pipes
• ICS: 23.040.40 - Metal fittings
• Technical Committee: F17 - Plastic Piping Systems
• Drafting Committee: F17.11 - Composite

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation: F 781 – 95
Standard Specification for
Perfluoro (Alkoxyalkane) Copolymer (PFA) Plastic-Lined
Ferrous Metal Pipe and Fittings
This standard is issued under the fixed designation F 781; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
Carbon-Steel Castings Suitable for Fusion Welding for High- A 216
Temperature Service
1.1 This specification covers factory-made perfluoro
Ferritic Ductile Iron for Pressure Retaining Castings for Use at A 395
(alkoxyalkane) copolymer (PFA) plastic-lined ferrous metal Elevated Temperatures
Ductile Iron Castings A 536
pipe and fittings, primarily intended for conveying corrosive
2,3
liquids and gases. Requirements for materials, workmanship,
1.3.3 For Ferrous Fittings :
dimensions, design, construction, working pressures and tem-
ASTM
peratures, test methods, and markings are included. Title of Specification Designation
Forgings, Carbon Steel, for Piping Components A 105
1.2 The values given in parentheses are provided for infor-
Forged or Rolled Steel Pipe Flanges, Forged Fittings, and Valves A 181
mation purposes only.
and Parts for General Service
Carbon Steel Castings Suitable for Fusion Welding for High- A 216
NOTE 1—This specification does not include products coated with PFA
Temperature Service
nor does it define the suitability of PFA-lined components in chemical
Piping Fittings Wrought Carbon Steel and Alloy Steel for A 234
environments. Moderate and Elevated Temperatures
Austenitic Steel Castings for High-Temperature Service A 351
1.3 The ferrous piping products shall meet the requirements
Alloy Steel Castings Specially Heat-Treated for Pressure A 389
Containing Parts Suitable for High-Temperature Service
of the relevant specification listed in 1.3.1 through 1.4.
Ferritic Ductile Iron for Pressure Retaining Castings for Use at A 395
Nominal sizes from 1 through 12 in. in 150 and 300 psi (1.0 to
Elevated Temperatures
2.0 MPa) ratings are covered.
Ductile Iron Castings A 536
Ductile Iron for Pressure Containing Castings for Use at Elevated A 403
NOTE 2—The PFA sealing faces may prevent achievement of the full
Temperatures
pressure rating of the ferrous housings. For pressure limitations, the
1.4 The PFA-lined flanged pipe and fitting assemblies are
manufacturer should be consulted.
limited to use from −20 to 500°F (−29 to 260°C). For use
2,3
1.3.1 For Ferrous Pipe :
below −29°C (−20°F) consult the manufacturer.
ASTM
Title of Specification Designation
NOTE 3—The above temperature limitations are based on noncorrosive
Pipe, Steel, Black, and Hot-Dipped, Zinc-Coated Welded and A53
test conditions. Use in specific aggressive environments may alter the
Seamless
above temperatures, and these limits shall be established by mutual
Seamless Carbon Steel Pipe and High-Temperature Service A 106
agreement between the purchaser and manufacturer.
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 2. Referenced Documents
2,3
2.1 ASTM Standards:
1.3.2 For Ferrous Flanges :
D 1600 Terminology for Abbreviated Terms Relating to
ASTM
Title of Specification Designation Plastics
Forgings, Carbon Steel, for Piping Components A 105
D 3307 Specification for PFA-Fluorocarbon Molding and
Forged or Rolled Steel Pipe Flanges, Forged Fittings and Valves A 181
Extrusion Materials
and Parts for General Service
Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and A 182
F 412 Terminology Relating to Plastic Piping Systems
Valves and Parts for High-Temperature Service
2.2 ANSI Standard:
B 16.5 Steel Pipe Flanges and Flanged Fittings
2.3 Federal Standard:
This specification is under the jurisdiction of ASTM Committee F-17 on Plastic
Piping Systems and is the direct responsibility of Subcommittee F17.11 on
Composite. Annual Book of ASTM Standards, Vol 08.01.
Current edition approved Sept. 10, 1995. Published November 1995. Originally Annual Book of ASTM Standards, Vol 08.03.
published as F 781 – 82. Last previous edition F 781 – 93. Annual Book of ASTM Standards, Vol 08.04.
2 7
Annual Book of ASTM Standards, Vol 01.01. Available from American National Standards Institute, 11 West 42nd St., 13th
Annual Book of ASTM Standards, Vol 01.02. Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F 781
Fed. Std. No. 123 Marking for Shipment (Civil Agencies) 5.1.2 Wall Thickness—Fitting linings shall have a minimum
2.4 Military Standard: wall thickness of ⁄32 in. (2.38 mm), and shall have a uniform
MIL-STD-129 Marking for Shipment and Storage face thickness of not less than ⁄32 in. (2.38 mm). Pipe linings
shall have a minimum wall thickness of 0.050 in. (1.27 mm),
3. Terminology and the flared radius and gasket faces shall have a uniform
thickness not less than 80 % of the wall thickness.
3.1 The terminology used is in accordance with Terminol-
5.1.3 PFA Face Diameter—The outside diameter of the
ogy F 412, and abbreviations are in accordance with Terminol-
PFA covering the gasket face of the flange or the full face of the
ogy D 1600 unless otherwise specified.
lap-joint stub end shall not be less than the diameter specified
3.2 The abbreviation for perfluoro (alkoxyalkane) copoly-
in Table 1 and they shall be concentric within ⁄16 in. (1.6 mm).
mer is PFA.
5.1.4 Tolerances—Tolerances for pipe, flanges, and fittings
shall be as specified in Table 2. Bolt holes in both flanges on a
4. Materials
fixed-flange spool shall straddle the same center line to
4.1 Lining:
facilitate alignment. Finished lined (plastic face to plastic face)
4.1.1 Material—The lining shall be made from PFA resins
fabricated fittings shall conform to the nominal face-to-face,
conforming to the requirements of Type II materials as defined
etc. as specified in ANSI B 16.5 with the applicable tolerances.
in Specification D 3307 except that a maximum of 1 % by
5.2 Flange Construction:
weight of additives or colorants, or both, is permissible.
5.2.1 Screw-type flanges shall be secured in position to
Organic colorants, if used, shall be identified in the manufac-
prevent inadvertent turning of the flange.
turer’s specification.
5.2.2 Socket-type flanges shall be fully back-welded to the
4.1.2 Mechanical Properties—The minimum tensile
pipe housing and the inside surfaces of the socket flanges shall
strength and minimum elongation at yield when tested in
be welded and ground smooth.
accordance with the requirements of Specification D 3307 shall
5.2.3 Slip-on flanges shall be fully backwelded.
be 3800 psi (26 MPa) and 300 % respectively.
4.1.3 Flow Rate—PFA resins used to manufacture the liner NOTE 4—No welding shall be done on lined components.
and molded fittings shall have a maximum flow rate of 3.0 g/10
5.2.4 Lap-joint (or Van Stone) flanged ends may be manu-
min when tested in accordance with Specification D 3307.
factured by standard forming techniques or by using fully
4.2 Ferrous Pipe and Fittings:
welded stub ends or collars. Lap-joints shall not contain any
4.2.1 The mechanical properties of the pipes and fittings
cracks or buckles.
shall conform to the requirements of the appropriate specifi-
NOTE 5—The use of lap-joint flanges in a piping system may simplify
cation of 1.3 except as they are influenced by accepted methods
alignment.
of processing in the industry, for example, Van Stone flaring,
5.3 Venting—Each pipe and fittings shall be provided with a
bending, swagging, and welding. The carbon steel pipe and
wrought fittings shall be welded or seamless steel. Schedule 40 venting system that will release any gases between the linear
and the housing (this system will also indiate any leakage
or Schedule 80, except that Schedule 30 pipe may be used in 8,
through the liner). Two systems that provide adequate venting
10, and 12-in. nominal size. Schedule 20 may also be used for
1 5
are a series of ⁄16 to ⁄32-in. (1.6 to 4-mm) diameter holes in the
12-in. nominal size with the agreement of the purchaser.
housings or a helical groove system inside the housing that
4.2.2 Finish—The interior surfaces of all housings shall be
connects flange vents.
clean and free of mold burrs, rust, scale, or other protrusions,
that may adversely affect the integrity or performance of the
NOTE 6—Vent holes should not be plugged with paint, cement, etc.,
lining.
since this negates the intended purpose listed in 5.3.
4.3 Back-Up Gaskets:
5.4 Workmanship:
4.3.1 General—Back-up gaskets shall be used to cover the
5.4.1 Pipe and fitting linings shall show no evidence of
pipe and gasket face of threaded or slip-on flanges unless a full
pinholes, porosity, or cracks when inspected in accordance
radius is provided at the end of the pipe and flange. Gaskets
with 5.5.2. The linings shall fit snugly inside the pipe and
may also be required on fittings to provide accommodation, or
fitting housings. Any bulges or other obvious indication of poor
elimination, or both, of sharp corners that could damage the
contact with the housing shall be cause for rejection.
lining.
4.3.2 Material—Plain gaskets meeting the temperature re-
quirements, or perforated metallic gaskets, may be used.
TABLE 1 Face Diameter
Nominal Pipe Size, in. Minimum PFA Face
5. Requirements
Diameter, in. (mm)
11 ⁄8 (48)
5.1 Dimensions:
1.5 2 ⁄16(68)
5.1.1 Housings—Housing installation dimensions are as
23 ⁄16 (87)
required in the applicable material specification listed in 1.3.
34 ⁄8 (117)
45 ⁄16 (151)
6 8 (203)
810 ⁄16(256)
8 10 12 ⁄4(311)
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
12 14 ⁄8(365)
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
F 781
TABLE 2 Tolerances for Pipe, Flanges, and Fittings
such a manner as to permit complete drainage and then subject
Pipe Tolerance, in. (mm) them to 100 steam-cold water cycles, each of which shall
consist of the following in the sequence given:
Length 6 ⁄8(63.2)
Fixed flange bolt hole alignment 6 ⁄16 (61.6)
6.2.2.1 Circulate saturated steam at a gage pressure of 125
Flange perpendicularity (with pipe ⁄32in./ft. of diameter (7.8
6 5 psi (862 6 35 kPa) through the specimens until the ferrous
centerline) mm/m of diameter
Flanges and Fittings housing skin temperature adjacent to the flange at the outlet
All dimensions per ANSI B 16.5
end of the test specimen has
...