ASTM F722-82(2014)
(Specification)Standard Specification for Welded Joints for Shipboard Piping Systems
Standard Specification for Welded Joints for Shipboard Piping Systems
ABSTRACT
This specification covers typical details of welded joints commonly used in shipboard piping systems. These joints and other joints may be used provided the welding procedures used have been qualified in accordance with the applicable regulatory rules and regulations. The maximum butt weld reinforcement of differnet nominal wall thicknesses of pipe or tube shall be discussed.
SCOPE
1.1 This specification covers typical details of welded joints commonly used in shipboard piping systems. These joints and other joints may be used provided the welding procedures used have been qualified in accordance with the applicable regulatory rules and regulations.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
General Information
Relations
Buy Standard
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Designation:F722 −82 (Reapproved 2014) An American National Standard
Standard Specification for
Welded Joints for Shipboard Piping Systems
ThisstandardisissuedunderthefixeddesignationF722;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Fig. 5 Butt Joint, Compound Bevel V-Grooved, Welded
Both Sides
1.1 This specification covers typical details of welded joints
Fig. 6 Butt Joint, V-Grooved, Miter Type
commonly used in shipboard piping systems. These joints and
Fig. 7 Butt Joint, V-Grooved, Welded with Bevel End-Type
other joints may be used provided the welding procedures used
Backing Ring
have been qualified in accordance with the applicable regula-
tory rules and regulations. Fig. 8 Butt Joint, Compound Bevel V-Grooved, Welded
with Bevel End-Type Backing Ring
1.2 The values stated in inch-pound units are to be regarded
Fig. 9 Butt Joint, V-Grooved Welded with Bevel End
as standard. The values given in parentheses are mathematical
Lug-Type Backing Ring
conversions to SI units that are provided for information only
Fig. 10 Butt Joint, V-Grooved, Welded with Square End-
and are not considered standard.
Type Backing Ring
Fig. 11 Butt Joint, V-Grooved, Welded with Consumable
2. Referenced Documents
Insert Ring
2.1 Federal Standards:
Fig. 12 Butt Joint, Compound Bevel V-Grooved, Welded
Code of Federal Regulations Title 46 Shipping, Parts 30 to
with Consumable Insert Ring
Fig. 13 Butt Joint, U-Grooved, Welded with Consumable
Code of Federal Regulations Title 46 Shipping, Parts 41 to
2 Insert Ring
Fig. 14 Butt Joint, V-Grooved, Welded with Consumable
Code of Federal Regulations Title 46 Shipping, Parts 140 to
Insert Ring
Fig. 15 Butt Joint, Socket Weld to Socket Weld Valve,
Rules for Building and Classing Steel Vessels
Fitting or Flange Welded on Pipe Nipple
3. Application, Service, Limitations, and List of Weld Fig. 16 Butt Joint, Transition between Unequal Inside and
Joint Details Outside Diameter Components
3.1.2 Fillet Welded Joints for Valves, Fittings, and Flanges:
3.1 Details of welded joints, including application, service,
Fig. 17 Fillet Welded Sleeve-Type Pipe Coupling
and limitation notes, are provided in the appropriate figures, as
Fig. 18 Fillet Welded Socket Weld Fitting or Valve
follows:
Fig. 19 Fillet Welded Socket Weld-Flange
3.1.1 Butt-Welded Joints for Pipes, Valves, Fittings, and
Flanges:
Fig. 20 Double Fillet Welded Slip-On Flange (Forged)
Fig. 1 Butt Joint, Square
Fig. 21 Double Fillet Welded Slip-On Flange (Plate Type)
Fig. 2 Butt Joint, V-Grooved
Fig. 22 Fillet Welded Slip-On Flange (Plate Type), Single
Fig. 3 Butt Joint, V-Grooved, Welded Both Sides
Bevel
Fig. 4 Butt Joint, Double V-Grooved, Welded Both Sides
3.1.3 Fabricated Joints:
Fig. 23 Fillet Welded Internal Root Connection
Fig. 24 Fillet Welded External Root Connection
This specification is under the jurisdiction of ASTM Committee F25 on Ships
Fig. 25 Fillet Reinforced External Root Connection Single
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Bevel
Machinery and Piping Systems.
Current edition approved Nov. 1, 2014. Published November 2014. Originally
Fig. 26 Fillet Reinforced External Root Connection, Single
approved in 1981. Last previous edition approved in 2008 as F722 – 82 (2008).
Bevel, Welded Both Sides
DOI: 10.1520/F0722-82R14.
AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments, Fig. 27 Fillet Reinforced External Root Connection, Single
732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
Bevel, Welded with Square End Backing Ring
www.access.gpo.gov.
Fig. 28 Fillet Reinforced Internal Root Connection, Single
Available from American Bureau of Shipping (ABS), ABS Plaza, 16855
Northchase Dr., Houston, TX 77060, http://www.eagle.org. Bevel, Welded with Square End Backing Ring
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F722−82 (2014)
⁄8 in. = 3mm
⁄16 in. = 5mm
⁄16 in. = 2mm
Application—Class II piping
⁄8 in. = 3mm
Systems or Service—For services such as gravity drains (including plumbing),
⁄8 in. = 22 mm
vents, and overflows.
Remarks—1. Root of weld need not be ground.
Application—Class I and II piping above 2-in. NPS
FIG. 1 Butt Joint, Square
System or Service—All
Remarks—1. Internal weld shall be made first and ground, chipped, or cleaned
by some other means to assure sound welds.
2. The “L” dimension should be held to a minimum to facilitate welding and
inspection on the inside surface of the pipe.
FIG. 3 Butt, Joint, V-Grooved, Welded Both Sides
⁄16 in. = 2mm
⁄8 in. = 3mm
⁄8 in. = 22 mm
Application—Class II piping
System or Service—All provided root of weld is visually inspected where
⁄16 in. = 2mm
possible to ensure complete weld penetration.
⁄8 in. = 3mm
Remarks—1. For services such as vents, overflows, and gravity drains (includ-
⁄8 in. = 22 mm
ing plumbing) the root of the weld need not be ground.
FIG. 2 Butt Joint, V-Grooved
Application—Class I and II piping above 2-in. NPS
System or Service—All
Remarks—1. Internal weld shall be made first and ground, chipped, or cleaned
3.1.4 Outlet and Boss Connections:
by some other means to assure sound welds.
Fig. 29 Fillet Reinforced Boss Connection Without Pilot,
2. The “L” dimension should be held to a minimum to facilitate welding and
Single Bevel inspection on the inside surface of the pipe.
FIG. 4 Butt Joint, Double V-Grooved, Welded Both Sides
Fig.30 FilletReinforcedBossConnectionwithPilot,Single
Bevel
tions ofABS Group I and II Pipe Connections, seeABS Rules,
Fig. 31 Fillet Reinforced Boss Connection (Couplet) with
Section 30, Paragraph 30.13.
Integral Backing Ring
Fig. 32 Fillet Reinforced External Root Connection, Single 4.2 Maximum thickness of butt weld reinforcements in
Bevel with Integrally Reinforced Outlet
accordance with Subpart 56.70, Table 56.70-15, of USCG
Fig. 33 Fillet Reinforced External Root Connection Welded Regulations are listed in Table 1.
Both Sides, Single Bevel with Integrally Reinforced Outlet
5. Keywords
4. Piping Classifications and Butt Weld Reinforcements
5.1 backing ring pipe welds; boss connections; flange
4.1 Piping classifications in accordance with Subpart 56.04 welds; miter joint weld; pipe welds; root connections; sleeve
of USCG Regulations apply to this specification. For defini- pipe welds; socket welds; welded joints
F722−82 (2014)
1 1 3 7
in. ⁄16 ⁄8 ⁄16 ⁄8
mm 2 3 5 22
1 1 3 7
in. ⁄16 ⁄8 ⁄4 ⁄8
Application—Class I and II piping
mm 2 3 19 22
System or Service—All, except as noted in remarks
Remarks—1. Backing ring may be tack-welded in place to facilitate fabrication.
Application—Class I and II piping above 2-in. NPS
2. When used in the following services, backing rings shall be removed.
Systems or Service—All
(A) Lube oil service discharge piping from the lube oil pumps to the reduction
Remarks—1. Internal weld shall be made first and ground, chipped, or cleaned
gears, HP and LP turbines, and lube oil gravity tank.
by some other means to assure sound welds.
(B) Superheated steam outlet piping from the main boilers to the HP and LP
2. The “L” dimension should be held to a minimum to facilitate welding and
turbines and turbo generators and desuperheated steam from the main boilers to
inspection on the inside surface of the pipe.
turbine driven main feed pumps.
(C) Central hydraulic systems.
FIG. 5 Butt Joint, Compound Bevel V-Grooved, Welded Both
FIG. 7 Butt Joint, V-Grooved, Welded with Bevel End-Type Back-
Sides
ing Ring
1 1 1 3 3 7
⁄16 in. = 2mm
in. ⁄16 ⁄8 ⁄4 ⁄8 ⁄4 ⁄8
⁄8 in. = 3mm
mm 2 3 6 10 19 22
⁄8 in. = 22 mm
Application—Class I and II piping
Application—Class II piping where use will not cause objectionable pressure
System or Service—All, except as noted in remarks
drop or turbulence.
Remarks—1. Backing ring may be tack-welded in place to facilitate fabrication.
System or Service—All provided root of weld is visually inspected where
2. When used in the following services, backing rings shall be removed.
possible to ensure complete weld penetration.
(A) Lube oil service discharge piping from the lube oil pumps to the reduction
Remarks—1. For services such as vents, overflows, and gravity drains (includ-
gears, HP and LP turbines, and lube oil gravity tank.
ing plumbing), the root of the weld need not be ground.
(B) Superheated steam outlet piping from the main boilers to the HP and LP
2. MitersegmentsshallbedesignedinaccordancewithANSIB31.1,paragraph
turbines and turbo generators and desuperheated steam from the main boilers to
104.33, and 46 CFR 56.07-10(f).
turbine driven main feed pumps.
FIG. 6 Butt Joint, V-Grooved, Miter Type (C) Central hydraulic systems.
FIG. 8 Butt Joint, Compound Bevel V-Grooved, Welded with
Bevel End-Type Backing Ring
F722−82 (2014)
1 1 1 7
in. ⁄64 ⁄32 ⁄16 ⁄8
mm 0.4 1 2 22
⁄8 in. = 22 mm
Application—Class I and II piping
Application—Class I and II piping System or Service—All
Systems or Service—All, except as noted in remarks Remarks—1. Internal misalignment of pipes shall not exceed ⁄16 in. (2 mm).
Remarks—1. Backing ring may be tack-welded in place to facilitate fabrication 2. Consumable insert ring shall be centered before welding.
2. When used in the following services, backing rings shall be removed.
FIG. 11 Butt Joint, V-Grooved, Welded with Consumable Insert
(A) Lube oil service discharge piping from the lube oil pumps to the reduction
Ring
gears, HP and LP turbines, and lube oil gravity tank.
(B) Superheated steam outlet piping from the main boilers to the HP and LP
turbines and turbo generators and desuperheated steam from the main boilers to
turbine driven main feed pumps.
(C) Central hydraulic systems.
FIG. 9 Butt Joint, V-Grooved Welded with Bevel End Lug-Type
Backing Ring
1 1 1 3 7
in. ⁄64 ⁄32 ⁄16 ⁄4 ⁄8
mm 0.4 1 2 19 22
Application—Class I and II piping
System or Service—All
Remarks—1. Internal misalignment of pipes shall not exceed ⁄16 in. (2 mm).
1 1 3 7
in. ⁄16 ⁄8 ⁄16 ⁄8
2. Consumable insert ring shall be centered before welding.
mm 2 3 5 22
FIG. 12 Butt Joint, Compound Bevel V-Grooved, Welded with
Consumable Insert Ring
Application—Class I and II piping
Systems or Service—All
Remarks—1. After welding, backing ring shall be machined flush with inside
diameter of pipe or fitting.
FIG. 10 Butt Joint, V-Grooved, Welded with Square End-Type
Backing Ring
1 1 1 3
in. ⁄64 ⁄32 ⁄16 ⁄16
mm 0.4 1 2 5
Application—Class I and II Piping
System or Service—All
Remarks—1. Internal misalignment of pipes shall not exceed ⁄16 in. (2 mm).
2. Consumable insert ring shall be centered before welding.
FIG. 13 Butt Joint, U-Grooved, Welded with Consumable Insert
Ring
F722−82 (2014)
0.020 in. = 0.51 mm.
Application—Class I and II piping
System or Service—All
Remarks—1. Internal misalignment of pipes shall not exceed ⁄32 in. (1 mm).
2. Consumable insert ring shall be centered before welding.
FIG. 14 Butt Joint, V-Grooved, Welded with Consumable Insert
Ring
FIG. 16 Butt Joint, Transition Between Unequal Inside and Out-
side Diameter Components
⁄16 in. = 2 mm
⁄4 in. = 6 mm
⁄8 in. = 10 mm
Application—Fittings: See Fig. 18. Flanges: See Fig. 19.
System or Service—See Fig. 18 and Fig. 19.
⁄16in.=2mm
Remarks—1. Size of weld shall be equal to or greater than “T.’’
2. ForClassIpiping,depthofinsertionofthepipenippleintothefittingshallnot
be less than ⁄8 in. (10 mm). Application—Class I piping 3-in. NPS max where not subject to full radiography
by 46 CFR Table 56.95-10. Class II piping all sizes.
3. Weld to be deposited in a minimum of two passes unless specifically
approved otherwise in a special procedure qualification. Systems or Service—All
Remarks—1. Size of weld shall be 1.4 T min but not less than ⁄8 in. (3 mm).
FIG. 15 Butt Joint, Socket Weld to Socket Weld Valve, Fitting or
2. ForClassIpiping,depthofinsertionofpipe,tube,orfittinginsleeveshallnot
Flange Welded on Pipe Nipple
be less than ⁄8 in. (10 mm).
3. Weld to be deposited in a minimum of two passes unless specifically
approved otherwise in a special procedure qualification.
4. For Class I piping, the inside diameter of the sleeve shall not exceed the
outside diameter of the pipe, tube, or fitting by more than 0.080 in. (2.03 mm).
5. Couplings may be used with flat or beveled end pipes and fitting.
FIG. 17 Fillet Welded Sleeve-Type Pipe Coupling
F722−82 (2014)
⁄16in.=2mm
Application—Class I piping 3-in. NPS max where not subject to full radiography
by 46 CFR Table 56.95-10. Class II piping all sizes.
System or Service—All, except socket welds shall not be used where severe
erosion or crevice corrosion is expected to occur.
1 1
Remarks—1. Size of weld shall be 1 ⁄4 T min but not less than ⁄8 in. (3 mm).
Application—Class I and II piping not to exceed the service pressure tempera-
2. ForClassIpiping,depthofinsertionofpipeortubeintothefittingshallnotbe
ture ratings for the 300# and lower classes. Slip-on flanges shall not be used on
less than ⁄8 in. (10 mm).
Class I piping where subject to full radiography by 46 CFR Table 56.95-10.
3. Weld to be deposited in a minimum of two passes unless specifically
System or Service—All
approved otherwise in a special procedure qualification.
Remarks—1.SizeofWeldW1shallbe1.4Tmin.forClassIIpiping,sizeofweld
FIG. 18 Fillet Welded Socket Weld Fitting or Valve
may be limited to ⁄32 in. (13 mm) max.
2. Size of Weld W2 shall be equal to “T’’ or ⁄4 in. (6 mm), whichever is smaller.
3. Dimension X shall be equal to T plus ⁄16 in. (2 mm) min. for Class II piping,
Dimension X may be limited to ⁄8 in. (10 mm).
FIG. 20 Double Fillet Welded Slip-on Flange (Forged)
⁄16 in. = 2 mm.
Application— Class I piping 3-in. NPS max for 600# and lower classes and
2 ⁄2-in. NPS for 900 and 1500# classes. 3-in. size not permitted where subject to
full radiography by 46 CFR Table 56.95-10. Class II piping all sizes.
System or Service—All, except socket welds shall not be used where severe
erosion or crevice corrosion is expected to occur
Remarks—1. SizeofWeldW1shallbe1.4Tmin.forClassIIpiping,sizeofweld
may be limited to ⁄32 in. (13 mm) max.
Application—ClassIIpipingnotexceeding150psi(1034kPa)or450°F(232°C)
2. Weld to be deposited in a minimum of two passes unless specifically
System or Service—All
approved otherwise in a special procedure qualification.
Remarks—1
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F722 − 82 (Reapproved 2008) F722 − 82 (Reapproved 2014)An American National Standard
Standard Specification for
Welded Joints for Shipboard Piping Systems
This standard is issued under the fixed designation F722; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification covers typical details of welded joints commonly used in shipboard piping systems. These joints and other
joints may be used provided the welding procedures used have been qualified in accordance with the applicable regulatory rules
and regulations.
1.2 The values stated in inch-pound units are to be regarded as the standard. standard. The values given in parentheses are
mathematical conversions to SI units that are provided for information only and are not considered standard.
2. Referenced Documents
2.1 Federal Standards:
Code of Federal Regulations Title 46,46 Shipping, Parts 30 to 40
Code of Federal Regulations Title 46,46 Shipping, Parts 41 to 69
Code of Federal Regulations Title 46,46 Shipping, Parts 140 to 149
Rules for Building and Classing Steel Vessels
3. Application, Service, Limitations, and List of Weld Joint Details
3.1 Details of welded joints, including application, service, and limitation notes, are provided in the appropriate figures, as
follows:
3.1.1 Butt-Welded Joints for Pipes, Valves, Fittings, and Flanges:
Fig. 1 Butt Joint, Square
Fig. 2 Butt Joint, V-Grooved
Fig. 3 Butt Joint, V-Grooved, Welded Both Sides
Fig. 4 Butt Joint, Double V-Grooved, Welded Both Sides
Fig. 5 Butt Joint, Compound Bevel V-Grooved, Welded Both Sides
Fig. 6 Butt Joint, V-Grooved, Miter Type
Fig. 7 Butt Joint, V-Grooved, Welded with Bevel End-Type Backing Ring
Fig. 8 Butt Joint, Compound Bevel V-Grooved, Welded with Bevel End-Type Backing Ring
Fig. 9 Butt Joint, V-Grooved Welded with Bevel End Lug-Type Backing Ring
Fig. 10 Butt Joint, V-Grooved, Welded with Square End-Type Backing Ring
Fig. 11 Butt Joint, V-Grooved, Welded with Consumable Insert Ring
Fig. 12 Butt Joint, Compound Bevel V-Grooved, Welded with Consumable Insert Ring
Fig. 13 Butt Joint, U-Grooved, Welded with Consumable Insert Ring
Fig. 14 Butt Joint, V-Grooved, Welded with Consumable Insert Ring
Fig. 15 Butt Joint, Socket Weld to Socket Weld Valve, Fitting or Flange Welded on Pipe Nipple
Fig. 16 Butt Joint, Transition between Unequal Inside and Outside Diameter Components
3.1.2 Fillet Welded Joints for Valves, Fittings, and Flanges:
Fig. 17 Fillet Welded Sleeve-Type Pipe Coupling
Fig. 18 Fillet Welded Socket Weld Fitting or Valve
This specification is under the jurisdiction of ASTM Committee F25 on Ships and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Machinery and Piping Systems.
Current edition approved Nov. 1, 2008Nov. 1, 2014. Published December 2008November 2014. Originally approved in 1981. Last previous edition approved in 20042008
as F722 – 82 (2004).(2008). DOI: 10.1520/F0722-82R08.10.1520/F0722-82R14.
Available from U.S. Government Printing Office Superintendent of Documents, 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401.20401,
http://www.access.gpo.gov.
Available from American Bureau of Shipping (ABS), ABS Plaza, 16855 Northchase Dr., Houston, TX 77060.77060, http://www.eagle.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F722 − 82 (2014)
⁄8 in. = 3 mm
⁄16 in. = 5 mm
Application—Class II piping
Systems or Service—For services such as gravity drains (including plumbing), vents, and overflows.
Remarks—1. Root of weld need not be ground.
FIG. 1 Butt Joint, Square
⁄16 in. = 2 mm
⁄8 in. = 3 mm
⁄8 in. = 22 mm
Application—Class II piping
System or Service—All provided root of weld is visually inspected where possible to ensure complete weld penetration.
Remarks—1. For services such as vents, overflows, and gravity drains (including plumbing) the root of the weld need not be ground.
FIG. 2 Butt Joint, V-Grooved
⁄16 in. = 2 mm
⁄8 in. = 3 mm
⁄8 in. = 22 mm
Application—Class I and II piping above 2-in. NPS
System or Service—All
Remarks—1. Internal weld shall be made first and ground, chipped, or cleaned by some other means to assure sound welds.
2. The “L” dimension should be held to a minimum to facilitate welding and inspection on the inside surface of the pipe.
FIG. 3 Butt, Joint, V-Grooved, Welded Both Sides
Fig. 19 Fillet Welded Socket Weld-Flange
Fig. 20 Double Fillet Welded Slip-On Flange (Forged)
Fig. 21 Double Fillet Welded Slip-On Flange (Plate Type)
Fig. 22 Fillet Welded Slip-On Flange (Plate Type), Single Bevel
F722 − 82 (2014)
⁄16 in. = 2 mm
⁄8 in. = 3 mm
⁄8 in. = 22 mm
Application—Class I and II piping above 2-in. NPS
System or Service—All
Remarks—1. Internal weld shall be made first and ground, chipped, or cleaned by some other means to assure sound welds.
2. The “L” dimension should be held to a minimum to facilitate welding and inspection on the inside surface of the pipe.
FIG. 4 Butt Joint, Double V-Grooved, Welded Both Sides
1 1 3 7
in. ⁄16 ⁄8 ⁄4 ⁄8
mm 2 3 19 22
Application—Class I and II piping above 2-in. NPS
Systems or Service—All
Remarks—1. Internal weld shall be made first and ground, chipped, or cleaned by some other means to assure sound welds.
2. The “L” dimension should be held to a minimum to facilitate welding and inspection on the inside surface of the pipe.
FIG. 5 Butt Joint, Compound Bevel V-Grooved, Welded Both Sides
3.1.3 Fabricated Joints:
Fig. 23 Fillet Welded Internal Root Connection
Fig. 24 Fillet Welded External Root Connection
Fig. 25 Fillet Reinforced External Root Connection Single Bevel
Fig. 26 Fillet Reinforced External Root Connection, Single Bevel, Welded Both Sides
Fig. 27 Fillet Reinforced External Root Connection, Single Bevel, Welded with Square End Backing Ring
Fig. 28 Fillet Reinforced Internal Root Connection, Single Bevel, Welded with Square End Backing Ring
3.1.4 Outlet and Boss Connections:
Fig. 29 Fillet Reinforced Boss Connection Without Pilot, Single Bevel
Fig. 30 Fillet Reinforced Boss Connection with Pilot, Single Bevel
Fig. 31 Fillet Reinforced Boss Connection (Couplet) with Integral Backing Ring
Fig. 32 Fillet Reinforced External Root Connection, Single Bevel with Integrally Reinforced Outlet
Fig. 33 Fillet Reinforced External Root Connection Welded Both Sides, Single Bevel with Integrally Reinforced Outlet
4. Piping Classifications and Butt Weld Reinforcements
4.1 Piping classifications in accordance with Subpart 56.04 of USCG Regulations apply to this specification. For definitions of
ABS Group I and II Pipe Connections, see ABS Rules, Section 30, Paragraph 30.13.
F722 − 82 (2014)
⁄16 in. = 2 mm
⁄8 in. = 3 mm
⁄8 in. = 22 mm
Application—Class II piping where use will not cause objectionable pressure drop or turbulence.
System or Service—All provided root of weld is visually inspected where possible to ensure complete weld penetration.
Remarks—1. For services such as vents, overflows, and gravity drains (including plumbing), the root of the weld need not be ground.
2. Miter segments shall be designed in accordance with ANSI B31.1, paragraph 104.33, and 46 CFR 56.07-10(f).
FIG. 6 Butt Joint, V-Grooved, Miter Type
1 1 3 7
in. ⁄16 ⁄8 ⁄16 ⁄8
mm 2 3 5 22
Application—Class I and II piping
System or Service—All, except as noted in remarks
Remarks—1. Backing ring may be tack-welded in place to facilitate fabrication.
2. When used in the following services, backing rings shall be removed.
(A) Lube oil service discharge piping from the lube oil pumps to the reduction gears, HP and LP turbines, and lube oil gravity tank.
(B) Superheated steam outlet piping from the main boilers to the HP and LP turbines and turbo generators and desuperheated steam from the main boilers to turbine
driven main feed pumps.
(C) Central hydraulic systems.
FIG. 7 Butt Joint, V-Grooved, Welded with Bevel End-Type Backing Ring
4.2 Maximum thickness of butt weld reinforcements in accordance with Subpart 56.70, Table 56.70-15, of USCG Regulations
are listed in Table 1.
5. Keywords
5.1 backing ring pipe welds; boss connections; flange welds; miter joint weld; pipe welds; root connections; sleeve pipe welds;
socket welds; welded joints
F722 − 82 (2014)
1 1 3 7
in. ⁄16 ⁄8 ⁄16 ⁄8
mm 2 3 5 22
1 1 1 3 3 7
in. ⁄16 ⁄8 ⁄4 ⁄8 ⁄4 ⁄8
mm 2 3 6 10 19 22 Application—Class I and II piping
Systems or Service—All
Remarks—1. After welding, backing ring shall be machined flush with inside
Application—Class I and II piping
diameter of pipe or fitting.
System or Service—All, except as noted in remarks
Remarks—1. Backing ring may be tack-welded in place to facilitate fabrication.
FIG. 10 Butt Joint, V-Grooved, Welded with Square End-Type
2. When used in the following services, backing rings shall be removed.
Backing Ring
(A) Lube oil service discharge piping from the lube oil pumps to the reduction
gears, HP and LP turbines, and lube oil gravity tank.
(B) Superheated steam outlet piping from the main boilers to the HP and LP
turbines and turbo generators and desuperheated steam from the main boilers to
turbine driven main feed pumps.
(C) Central hydraulic systems.
FIG. 8 Butt Joint, Compound Bevel V-Grooved, Welded with
Bevel End-Type Backing Ring
1 1 1 7
in. ⁄64 ⁄32 ⁄16 ⁄8
mm 0.4 1 2 22
Application—Class I and II piping
System or Service—All
Remarks—1. Internal misalignment of pipes shall not exceed ⁄16 in. (2 mm).
2. Consumable insert ring shall be centered before welding.
FIG. 11 Butt Joint, V-Grooved, Welded with Consumable Insert
Ring
⁄8 in. = 22 mm
Application—Class I and II piping
Systems or Service—All, except as noted in remarks
Remarks—1. Backing ring may be tack-welded in place to facilitate fabrication
2. When used in the following services, backing rings shall be removed.
(A) Lube oil service discharge piping from the lube oil pumps to the reduction
gears, HP and LP turbines, and lube oil gravity tank.
(B) Superheated steam outlet piping from the main boilers to the HP and LP
turbines and turbo generators and desuperheated steam from the main boilers to
turbine driven main feed pumps.
(C) Central hydraulic systems.
FIG. 9 Butt Joint, V-Grooved Welded with Bevel End Lug-Type
Backing Ring
1 1 1 3 7
in. ⁄64 ⁄32 ⁄16 ⁄4 ⁄8
mm 0.4 1 2 19 22
Application—Class I and II piping
System or Service—All
Remarks—1. Internal misalignment of pipes shall not exceed ⁄16 in. (2 mm).
2. Consumable insert ring shall be centered before welding.
FIG. 12 Butt Joint, Compound Bevel V-Grooved, Welded with
Consumable Insert Ring
F722 − 82 (2014)
1 1 1 3
in. ⁄64 ⁄32 ⁄16 ⁄16
mm 0.4 1 2 5
Application—Class I and II Piping
System or Service—All
1 ⁄16 in. = 2 mm
Remarks—1. Internal misalignment of pipes shall not exceed ⁄16 in. (2 mm).
⁄4 in. = 6 mm
2. Consumable insert ring shall be centered before welding.
⁄8 in. = 10 mm
FIG. 13 Butt Joint, U-Grooved, Welded with Consumable Insert
Ring
Application—Fittings: See Fig. 18. Flanges: See Fig. 19.
System or Service—See Fig. 18 and Fig. 19.
Remarks—1. Size of weld shall be equal to or greater than “T.’’
2. For Class I piping, depth of insertion of the pipe nipple into the fitting shall not
be less than ⁄8 in. (10 mm).
3. Weld to be deposited in a minimum of two passes unless specifically
approved otherwise in a special procedure qualification.
FIG. 15 Butt Joint, Socket Weld to Socket Weld Valve, Fitting or
Flange Welded on Pipe Nipple
0.020 in. = 0.51 mm.
Application—Class I and II piping
System or Service—All
Remarks—1. Internal misalignment of pipes shall not exceed ⁄32 in. (1 mm).
2. Consumable insert ring shall be centered before welding.
FIG. 14 Butt Joint, V-Grooved, Welded with Consumable Insert
Ring
FIG. 16 Butt Joint, Transition Between Unequal Inside and Out-
side Diameter Components
F722 − 82 (2014)
⁄16 in. = 2 mm
Application—Class I piping 3-in. NPS max where not subject to full radiography
by 46 CFR Table 56.95-10. Class II piping all sizes.
Systems or Service—All
Remarks—1. Size of weld shall be 1.4 T min but not less than ⁄8 in. (3 mm).
2. For Class I piping, depth of insertion of pipe, tube, or fitting in sleeve shall not
be less than ⁄8 in. (10 mm).
3. Weld to be deposited in a minimum of two passes unless specifically
approved otherwise in a special procedure qualification.
4. For Class I piping, the inside diameter of the sleeve shall not exceed the
⁄16 in. = 2 mm.
outside diameter of the pipe, tube, or fitting by more than 0.080 in. (2.03 mm).
5. Couplings may be used with flat or beveled end pipes and fitting.
Application— Class I piping 3-in. NPS max for 600# and lower classes and
FIG. 17 Fillet Welded Sleeve-Type Pipe Coupling
2 ⁄2-in. NPS for 900 and 1500# classes. 3-in. size not permitted where subject to
full radiography by 46 CFR Table 56.95-10. Class II piping all sizes.
System or Service—All, except socket welds shall not be used where severe
erosion or crevice corrosion is expected to occur
Remarks—1. Size of Weld W1 shall be 1.4 T min. for Class II piping, size of weld
may be limited to ⁄32 in. (13 mm) max.
2. Weld to be deposited in a minimum of two passes unless specifically
approved otherwise in a special procedure qualification.
FIG. 19 Fillet Welded Socket Weld Flange
⁄16 in. = 2 mm
Application—Class I piping 3-in. NPS max where not subject to full radiography
by 46 CFR Table 56.95-10. Class II piping all sizes.
System or Service—All, except socket welds shall not be used where severe
erosion or crevice corrosion is expected to occur.
1 1
Remarks—1. Size of weld shall be 1 ⁄4 T min but not less than ⁄8 in. (3 mm).
2. For Class I piping, depth of insertion of pipe or tube into the fitting shall not be
less than ⁄8 in. (10 mm).
3. Weld to be deposited in a minimum of two passes unless specifically
approved otherwise in a special procedure qualification.
FIG. 18 Fillet Welded Socket Weld Fitting or Valve
Application—Class I and II piping not to exceed the service pressure tempera-
ture ratin
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.