ASTM F1734-03(2009)
(Practice)Standard Practice for Qualification of a Combination of Squeeze Tool, Pipe, and Squeeze-Off Procedures to Avoid Long-Term Damage in Polyethylene (PE) Gas Pipe (Withdrawn 2018)
Standard Practice for Qualification of a Combination of Squeeze Tool, Pipe, and Squeeze-Off Procedures to Avoid Long-Term Damage in Polyethylene (PE) Gas Pipe (Withdrawn 2018)
SIGNIFICANCE AND USE
Squeeze-off is widely used to temporarily control the flow of gas in PE pipe. Squeeze tools vary depending on the size of the pipe and the design of the tool. Squeeze-off procedures vary depending on the tool design, pipe material, and environmental conditions.
Experience indicates that some combinations of polyethylene material, temperature, tool design, wall compression percentage and procedure can cause damage leading to failure.
Studies of polyethylene pipe extruded in the late 1980s and thereafter show that damage typically does not develop when the wall compression percentage is 30 % or less, when temperatures are above 50°F (10°C), and when closure and release rates are typical of field conditions for screw-driven tools. With tools meeting Specification F 1563, acceptable flow control at typical gas service pressures is achieved at wall compression percentages between 10 and 20 % for pipe diameters less than 6 in. , Because damage does not develop in these materials at such squeeze levels, the references cited indicate that squeeze-off flow control practices using tools meeting Specification F 1563 and qualified procedures meeting Practice F 1041 are effective for smaller pipe sizes. ,
Note 3—Specification F 1563 provides a procedure for evaluating tool flow control performance.
This practice provides a method to qualify a combination of squeeze tool, pipe size and material, and squeeze-off procedure to ensure that long-term damage does not occur. This practice is useful for polyethylene gas pipe manufactured before 1975, for new or revised polyolefin gas pipe materials, for pipe diameters of 8 in. or above, for new or revised squeeze tool designs, and for new or revised squeeze-off procedures.
SCOPE
1.1 This practice covers qualifying a combination of a squeeze tool, a polyethylene gas pipe, and a squeeze-off procedure to avoid long-term damage in polyethylene gas pipe. Qualifying is conducted by examining the inside and outside surfaces of pipe specimens at and near the squeeze to determine the existence of features indicative of long-term damage. If indicative features are absent, sustained pressure testing in accordance with Specification D 2513 is conducted to confirm the viability of the squeeze-off process. For assistance with specimen examination, an Adjunct, ADJF1734 , is available from ASTM.
1.2 This practice is appropriate for any combination of squeeze tool, PE gas pipe and squeeze-off procedure, and is particularly appropriate for pre-1975 Polyethylene (PE) pipe, and for pipe sizes of 8 in. or above, because of a greater possibility of long-term damage.
1.3 This practice is for use by squeeze-tool manufacturers, pipe manufacturers and gas utilities to qualify squeeze tools made in accordance with Specification F 1563; and squeeze-off procedures in accordance with Guide F 1041 with pipe manufactured in accordance with Specification D 2513.
1.4 Governing codes and project specifications should be consulted. Nothing in this practice should be construed as recommending practices or systems at variance with governing codes and project specifications.
1.5 Where applicable in this guide, “pipe” shall mean “pipe and tubing.”
1.6 Units—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.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
WITHDRAWN RATIONALE
This practice covers qualifying a combination of a squeeze tool, a polyethylene gas pipe, and a squeeze-off procedure to avoid long-term damage in polyethylene gas pipe. Qualifying is conducted by examining the ...
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Designation:F1734 −03 (Reapproved 2009) An American National Standard
Standard Practice for
Qualification of a Combination of Squeeze Tool, Pipe, and
Squeeze-Off Procedures to Avoid Long-Term Damage in
Polyethylene (PE) Gas Pipe
This standard is issued under the fixed designation F1734; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This practice covers qualifying a combination of a
responsibility of the user of this standard to establish appro-
squeeze tool, a polyethylene gas pipe, and a squeeze-off
priate safety and health practices and determine the applica-
proceduretoavoidlong-termdamageinpolyethylenegaspipe.
bility of regulatory limitations prior to use.
Qualifying is conducted by examining the inside and outside
surfaces of pipe specimens at and near the squeeze to deter-
2. Referenced Documents
mine the existence of features indicative of long-term damage.
If indicative features are absent, sustained pressure testing in
2.1 ASTM Standards:
accordance with Specification D2513 is conducted to confirm
D2513Specification for Polyethylene (PE) Gas Pressure
the viability of the squeeze-off process. For assistance with
2 Pipe, Tubing, and Fittings
specimen examination, an Adjunct, ADJF1734 , is available
D3350Specification for Polyethylene Plastics Pipe and Fit-
from ASTM.
tings Materials
1.2 This practice is appropriate for any combination of
F1041Guide for Squeeze-Off of Polyolefin Gas Pressure
squeeze tool, PE gas pipe and squeeze-off procedure, and is
Pipe and Tubing
particularly appropriate for pre-1975 Polyethylene (PE) pipe,
F1563Specification for Tools to Squeeze-off Polyethylene
and for pipe sizes of 8 in. or above, because of a greater
(PE) Gas Pipe or Tubing
possibility of long-term damage.
2.2 ASTM Adjuncts:
1.3 This practice is for use by squeeze-tool manufacturers,
Interpretation Aid for Squeeze-Off Damage
pipe manufacturers and gas utilities to qualify squeeze tools
made in accordance with Specification F1563; and squeeze-off
3. Terminology
procedures in accordance with Guide F1041 with pipe manu-
factured in accordance with Specification D2513. 3.1 Definitions:
3.1.1 squeeze-off, n—a technique used to temporarily con-
1.4 Governing codes and project specifications should be
trol the flow of gas in a polyethylene gas pipe by flattening the
consulted. Nothing in this practice should be construed as
recommendingpracticesorsystemsatvariancewithgoverning pipe with a mechanical or hydraulic device.
codes and project specifications.
3.1.2 squeeze process, n—the combination of the squeeze
1.5 Where applicable in this guide, “pipe” shall mean “pipe
tool, the pipe being squeezed, and the squeeze-off procedure
and tubing.”
being used.
1.6 Units—The values stated in inch-pound units are to be
3.1.3 wall compression (WC), n—the percentage extent to
regarded as standard. The values given in parentheses are
which the pipe walls are compressed when the pipe is
mathematical conversions to SI units that are provided for
squeezed. (See Fig. 1.) It is defined as:
information only and are not considered standard.
L
WC,% 5 1 2 3100 (1)
S D
2t
This practice is under the jurisdiction of ASTM Committee F17 on Plastic
Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.
Current edition approved Aug. 1, 2009. Published September 2009. Originally
approved in 1996. Last previous edition approved in 2003 as F1734–03. DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/F1734-03R09. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Available from ASTM International Headquarters. Order Adjunct No. Standards volume information, refer to the standard’s Document Summary page on
ADJF1734. Original adjunct produced in 1995. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1734−03 (2009)
4.2 The squeezed samples are split along their length at 90
degrees to the squeeze “ears” (See Fig. 1).The area containing
the ears is examined visually using the unaided eye, then
magnification. Features such as crazing, small voids, or cracks
indicate permanent damage and disqualify the squeeze-off
process.
4.3 Wheretheresultsofthevisualscreeningdonotindicate
permanent damage, additional specimens are squeezed at the
WC level where damage is not indicated, and sustained
pressure tests in accordance with Specification D2513 are
performed. When sustained pressure test specimens meet the
requirements of Specification D2513, the squeeze-off process
has been verified.
4.3.1 When damage is identified at WCnom less 5% or
WCnomless10%levels,awallcompressionpercentagewhere
damagedoesnotoccurshouldbeidentified.Prepareadditional
specimens by lessening wall compression in 5% increments,
FIG. 1 Definition of Wall Compression
andthenexaminethespecimenstoidentifyawallcompression
percentage that does not indicate damage.
NOTE 2—This practice uses flow through the squeezed-off pipe as a
where:
parameter. For some combinations of tool, pipe and procedure, it is not
possibletostopflowcompletelywithoutcausingpermanentdamagetothe
L = distance between the squeeze tool bars as shown in Fig.
pipe, particularly for pipes greater than 2 in, nominal size.
1, and
t = uncompressed pipe wall thickness, expressed in the 4.4 Using a desired squeeze-off procedure, tests conducted
same units as L.
at different pipe temperatures with various sizes of tools and
pipes can be used to verify a range of temperatures, tool sizes,
3.1.3.1 Discussion—Whenthedistancebetweenthesqueeze
and pipe sizes for which the squeeze-off process is applicable.
toolbarsisgreaterthantwicethewallthickness,thepipewalls
are not compressed, which yields a negative value for the wall
5. Significance and Use
compressionpercentage.Thevaluebecomespositivewhenthe
5.1 Squeeze-off is widely used to temporarily control the
L value is less than the 2t value.Typical squeeze tool stops are
flow of gas in PE pipe. Squeeze tools vary depending on the
set for 30% or less wall compression based on maximum wall
size of the pipe and the design of the tool. Squeeze-off
thickness (a distance that is 70% of twice maximum wall
procedures vary depending on the tool design, pipe material,
thickness when the squeeze tool is closed to the stops).
and environmental conditions.
Maximum wall thickness is the minimum wall thickness plus
the wall thickness tolerance.
5.2 Experience indicates that some combinations of poly-
ethylene material, temperature, tool design, wall compression
4. Summary of Practice
percentage and procedure can cause damage leading to failure.
4.1 Pipe of the size and material of interest is cut into
5.3 Studies of polyethylene pipe extruded in the late 1980s
specimens at least 1 ft long or 3 diameters long whichever is
and thereafter show that damage typically does not develop
greater, and attached to a supply of pressurized gas. With
when the wall compression percentage is 30% or less, when
pressurized gas flowing through the specimen, the specimens
temperatures are above 50°F (10°C), and when closure and
are squeezed with the tool of interest, using the procedure of
release rates are typical of field conditions for screw-driven
interest, until the desired level of flow control is achieved.
tools. With tools meeting Specification F1563, acceptable
Using Eq 1, the wall compression percentage at the desired
flow control at typical gas service pressures is achieved at wall
level of flow control is determined. Let this level of wall
compression percentages between 10 and 20% for pipe diam-
4,5
compression be called WCnom. Additional specimens are
eters less than 6 in. Because damage does not develop in
squeezed to obtain squeeze levels that are 5% greater, 10%
these materials at such squeeze levels, the references cited
greater, 5% less and 10% less than WCnom. This squeeze
indicate that squeeze-off flow control practices using tools
range brackets levels of wall compression for flow control.
meeting Specification F1563 and qualified procedures meeting
NOTE 1—For example, if the desired level of flow control were 4,5
Practice F1041 are effective for smaller pipe sizes.
achieved at 25% wall compression, additional specimens would be
NOTE 3—Specification F1563 provides a procedure for evaluating tool
prepared at 35%, 30%, 20% and 15% wall compression. In research
flow control performance.
3 4,5
tests, a flow of 0.1 ft /h was considered equivalent to stopping the flow.
4 5
Stephens, D. R., Leis, B. N., Francini, R. B., and Cassady, M. J., Volume 1: Stephens, D. R., Leis, B. N., Francini, R. B., and Cassady, M. J., Volume 2:
Users’ Guide on Squeeze-Off of Polyethylene Gas Pipes, Topical Report GRI-92/ Technical Reference on Squeeze-Off of Polyethylene Gas Pipes, Topical Report
0147.1, NTIS PB93-161032, Battelle Columbus for Gas Research Institute, Febru- GRI-92/0147.2, NTIS PB93-161040, Battelle Columbus for Gas Research Institute,
ary 1992. October 1992.
F1734−03 (2009)
5.4 This practice provides a method to qualify a combina- 11. Procedure
tion of squeeze tool, pipe size and material, and squeeze-off
11.1 Orient the sample in the squeeze tool so that the
procedure t
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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.
An American National Standard
Designation:F 1734–96 Designation: F 1734 – 03 (Reapproved 2009)
Standard Practice for
Qualification of a Combination of Squeeze Tool, Pipe, and
Squeeze-Off Procedures to Avoid Long-Term Damage in
Polyethylene (PE) Gas Pipe
This standard is issued under the fixed designation F1734; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1Thispracticecoversthequalificationofasqueezeprocessconsistingofacombinationofasqueezetool,pipe,andsqueeze-off
procedurestoavoidlong-termdamageinpolyethylenegaspipe.Thispracticeexaminestheinsideandoutsidesurfacesofthepipe
near the squeeze to determine the existence of features indicative of long-term cracking.The occurrence of these features depends
on the squeeze tool design, the pipe being squeezed, and the squeeze procedures being used. This practice is particularly
appropriate for pre-1975 Polyethylene (PE) pipe, and for pipe with diameter greater than or equal to 8 in., because of the greater
possibility of long-term damage.
1.2After the visual screening identifies a viable squeeze process, a sustained pressure test in accordance with Specification
D2513 should be used to confirm the viability.
1.3This practice is for use by squeeze-tool manufacturers and gas utilities for all squeeze tools made in accordance with
SpecificationF1563;pipemanufacturedinaccordancewithSpecificationD2513,uptoandincludingpipediametersof12in.;and
squeeze procedures in accordance with Guide F1041
1.1 This practice covers qualifying a combination of a squeeze tool, a polyethylene gas pipe, and a squeeze-off procedure to
avoid long-term damage in polyethylene gas pipe. Qualifying is conducted by examining the inside and outside surfaces of pipe
specimens at and near the squeeze to determine the existence of features indicative of long-term damage. If indicative features are
absent, sustained pressure testing in accordance with Specification D2513 is conducted to confirm the viability of the squeeze-off
process. For assistance with specimen examination, an Adjunct, ADJF1734 , is available from ASTM.
1.2 This practice is appropriate for any combination of squeeze tool, PE gas pipe and squeeze-off procedure, and is particularly
appropriate for pre-1975 Polyethylene (PE) pipe, and for pipe sizes of 8 in. or above, because of a greater possibility of long-term
damage.
1.3 This practice is for use by squeeze-tool manufacturers, pipe manufacturers and gas utilities to qualify squeeze tools made
in accordance with Specification F1563; and squeeze-off procedures in accordance with Guide F1041 with pipe manufactured in
accordance with Specification D2513.
1.4 Governing codes and project specifications should be consulted. Nothing in this practice should be construed as
recommending practices or systems at variance with governing codes and project specifications.
1.5 Where applicable in this guide, “pipe” shall mean “pipe and tubing.”
1.6The values stated in inch-pound units are to be regarded as standard. The values in parentheses are for information only.
1.6 Units—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.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D2513 Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings
D3350 Specification for Polyethylene Plastics Pipe and Fittings Materials
F1041 Guide for Squeeze-Off of Polyolefin Gas Pressure Pipe and Fittings Tubing
This practice is under the jurisdiction of ASTM Committee F-17 F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.
Current edition approved Sept. 10, 1996. Published November 1996.
Current edition approved Aug. 1, 2009. Published September 2009. Originally approved in 1996. Last previous edition approved in 2003 as F1734–03.
Annual Book of ASTM Standards, Vol 08.04.
Available from ASTM International Headquarters. Order Adjunct No. . Original adjunct produced in 1995.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F 1734 – 03 (2009)
F1563 Specification for Tools to Squeeze-Off Polyethylene (PE) Gas Pipe or Tubing Specification for Tools to Squeeze-off
Polyethylene (PE) Gas Pipe or Tubing
2.2 ASTM Adjuncts:
Interpretation Aid for Squeeze-Off Damage
3. Terminology
3.1 Definitions:
3.1.1 squeeze-off,squeeze-off, n—a technique used to temporarily control the flow of gas in a polyethylene gas pipe by
compressingflattening the pipe with a mechanical or hydraulic device.
3.1.2 squeeze process,squeeze process, n—the combination of the squeeze tool, the pipe being squeezed, and the squeeze-off
procedures being used.
3.1.3 wall compression (WC),wall compression (WC), n—a measure of the extent to which the pipe is squeezed. (See —the
percentage extent to which the pipe walls are compressed when the pipe is squeezed. (See Fig. 1.) It is defined as:
L
WC,% 5 1 2 3100
S D
2t
(1)
where:
L = distance between the squeeze tool bars as shown in Fig. 1, and
t = averageuncompressed pipe wall thickness, expressed in the same units as L.
3.1.3.1 Discussion—When the distance between the squeeze tool bars is greater than twice the wall thickness, the pipe walls
are not compressed, which yields a negative value for the wall compression percentage. The value becomes positive when the L
value is less than the 2t value. Typical squeeze tool stops are set for 30% or less wall compression based on maximum wall
thickness (a distance that is 70% of twice maximum wall thickness when the squeeze tool is closed to the stops). Maximum wall
thickness is the minimum wall thickness plus the wall thickness tolerance.
4. Summary of Practice
4.1Pipe of the size and material of interest is cut into samples at least 1 ft long or 5 diameters long, whichever is greater. The
samples are squeezed in the tool of interest, using the procedure of interest, until the desired level of flow control is achieved. Let
this level of wall compression be called Smin. Then, four other samples are squeezed to obtain squeeze levels of (Smin−5)%,
(Smin+5)%, (Smin+10)%, and (Smin+15)%. This squeeze range brackets unacceptable through acceptable levels of wall
compression for flow control, with the (Smin+15)% value selected to allow an adequate operational range.
4.2Thesqueezedsamplesaresplitalongtheirlengthat90degreestothesqueeze“ears.”Theareacontainingtheearsisinspected
visually. Features such as crazing, small voids, or cracks indicate potential permanent damage for that combination of pipe, tool,
and squeeze procedure.
4.3The results of the visual screening are verified by performing a Sustained Pressure Test in accordance with Specification
D2513.
FIG. 1 Definition of Wall Compression
F 1734 – 03 (2009)
5.Significance and Use
5.1Squeeze-off is widely used to control the flow of gas in PE pipe. Squeeze tools vary depending on the size of the pipe and
the source of the tool.
5.2Experience indicates that some combinations of resin type, resin supplier, extruder, vintage, percent squeezed, and tool can
cause damage leading to failure.
5.3Studies of pipe extruded in the late 1980s and thereafter show that damage does not develop for wall compression less than
30%, for temperatures above 50°F, and squeeze and release rates typical of field conditions for screw-driven tools. With modern
tools, flow control at typical service pressures is achieved at squeeze levels between 10 and 20% for pipe diameters less than 6
in.
4.1 Pipe of the size and material of interest is cut into specimens at least 1 ft long or 3 diameters long whichever is greater, and
attached to a supply of pressurized gas. With pressurized gas flowing through the specimen, the specimens are squeezed with the
toolofinterest,usingtheprocedureofinterest,untilthedesiredlevelofflowcontrolisachieved.UsingEq1,thewallcompression
percentage at the desired level of flow control is determined. Let this level of wall compression be called WCnom. Additional
specimens are squeezed to obtain squeeze levels that are 5% greater, 10% greater, 5% less and 10% less than WCnom. This
squeeze range brackets levels of wall compression for flow control.
NOTE 1—For example, if the desired level of flow control were achieved at 25% wall compression, additional specimens would be prepared at 35%,
3 ,
30%, 20% and 15% wall compression. In research tests, a flow of 0.1 ft /h was considered equivalent to stopping the flow. Because
damage does not develop in these materials at such squeeze levels, the cited references validate that current practice is effective
for modern tools and materials for the smaller pipe sizes.
4.2 The squeezed samples are split along their length at 90 degrees to the squeeze “ears” (See Fig. 1). The area containing the
ears is examined visually using the unaided eye, then magnification. Features such as crazing, small voids, or cracks indicate
permanent damage and disqualify the squeeze-off process.
4.3 Where the results of the visual screening do not indicate permanent damage, additional specimens are squeezed at the WC
level where damage is not indicated, and sustained pressure tests in accordance with Specification D2513 are performed. When
sustained pressure test specimens meet the requirements of Specification D2513, the squeeze-off process has been verified.
4.3.1 Whendamageisidentifiedat WCnomless5%or WCnomless10%levels,awallcompressionpercentagewheredamage
does not occur should be identified. Prepare additional specimens by lessening wall compression in 5% increments, and then
examine the specimens to identify a wall compression percentage that does not indicate damage.
NOTE 2—This practice uses flow through the squeezed-off pipe as a parameter. For some combinations of tool, pipe and procedure, it is not possible
to stop flow completely without causing permanent damage to the pipe, particularly for pipes greater than 2 in, nominal size.
4.4 Using a desired squeeze-off procedure, tests conducted at different pipe temperatures with various sizes of tools and pipes
can be used to verify a range of temperatures, tool sizes, and pipe sizes for which the squeeze-off process is applicable.
5. Significance and Use
5.1 Squeeze-off is widely used to temporarily control the flow of gas in PE pipe. Squeeze tools vary depending on the size of
the pipe and the design of the tool. Squeeze-off procedures vary depending on the tool design, pipe material, and environmental
conditions.
5.2 Experience indicates that some combinations of polyethylene material, temperature, tool design, wall compression
percentage and procedure can cause damage leading to failure.
5.3 Studies of polyethylene pipe extruded in the late 1980s and thereafter show that damage typically does not develop when
the wall compression percentage is 30% or less, when temperatures are above 50°F (10°C), and when closure and release rates
are typical of field conditions for screw-driven tools. With tools meeting Specification F1563, acceptable flow control at typical
,
gas service pressures is achieved at wall compression percentages between 10 and 20% for pipe diameters less than 6 in.
5.4For pipe extruded before 1975, and for pipe diameters greater than or equal to 8 in., a method is needed to qualify the
combination of squeeze tool, pipe size and material, and squeeze procedure to ensure the absence of long-term damage. Because
damage does not develop in these materials at such squeeze levels, the references cited indicate that squeeze-off flow control
practices using tools meeting Specification F1563 and qualified procedures meeting Practice F1041 are effective for smaller pipe
,
3 4
sizes.
NOTE 3—Specification F1563 provides a procedure for evaluating tool flow control performance.
5.4 Thispracticeprovidesamethodtoqualifyacombinationofsqueezetool,pipesizeandmaterial,andsqueeze-offprocedure
to ensure that long-term damage does not occur. This practice is useful for polyethylene gas pipe manufactured before 1975, for
Stephens, D. R., Leis, B. N., Francini, R. B., and Cassady, M. J., Volume 1: Users’ Guide on Squeeze-Off of Polyethylene Gas Pipes, Topical Report GRI-92/0147.1,
NTIS PB93-161032, Battelle Columbus for Gas Research Institute, February 1992.
Stephens, D. R., Leis, B. N., Francini, R. B., and Cassady, M. J., Volume 2: Technical Reference on Squeeze-Off of Polyethylene Gas Pipes, Topical Report
GRI-92/0147.2, NTIS PB93-161040, Battelle Columbus for Gas Research Institute, October 1992.
.
F 1734 – 03 (2009)
new or revised polyolefin gas pipe materials, for pipe diameters of 8 in. or above, for new or revised squeeze tool designs, and
for new or revised squeeze-off procedures.
6. Interpretation of Results
6.1 This practice relies on a screening process using visual inspection followed by selected testing using the sustained pressure
testing as described in Specification D2513to qualify a squeeze-off process.
6.2The area of wrinkling at the ears on the inside diameter (ID) is inspected for void formation and cracks. Visible void
formation or cracks or extensive localized stress whitening, or combination thereof, disqualifies that procedure.
6.3Unacceptable features implying long-term damage are shown in the photographs available as an adjunct.
6.2 The area of wrinkling at the ears on the inside diameter (ID) of the pipe and the area on the outside of the pipe opposite
the ears are examined . Evidence of any one or a combination of void formation, cracks or extensive localized stress whitening,
or failure during sustained pressure testing disqualifies the squeeze-off process.
6.3 Unacceptable features implying long-term damage are shown in the photographs in adjunct, ADJF1734 .
7. Apparatus
7.1 Squeeze-off Tools, to be covered by the qualified procedure. , meeti
...
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