ASTM D2774-01
(Practice)Standard Practice for Underground Installation of Thermoplastic Pressure Piping
Standard Practice for Underground Installation of Thermoplastic Pressure Piping
SCOPE
1.1 This practice covers procedures and references ASTM specifications for undreground installation of thermoplastic pressure piping, 63-in. (1372-mm) nominal size and smaller. It is beyond the scope of this practice to describe these procedures in detail since it is recognized that significant differences exist in their implementation depending on kind and type of pipe material, pipe size and wall thickness, soil conditions, and the specific end use.
1.1.1 This practice assumes that over the range of anticipated operating conditions, including maximum external loading and minimum internal pressure, the soil/pipe system will offer sufficient structural stability to resist possible excessive diametrical deformation, or even collapse. In cases, particularly with large diameter thinner-walled pipe, for which the validity of this assumption may be in question, the selection of pipe and recommended installation conditions should be determined by a qualified engineer.
1.1.2 Specific pipe characteristics and end-use requirements may dictate addition to, or modification of the procedures stated or referenced herein.
1.2 The values stated in inch-pound units are to be regarded as the standard.
1.3 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. Specific precautionary statements are given in Sections 10 and 11.
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An American National Standard
Designation: D 2774 – 01
Standard Practice for
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Underground Installation of Thermoplastic Pressure Piping
This standard is issued under the fixed designation D 2774; 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.
This standard has been approved for use by agencies of the Department of Defense.
INTRODUCTION
In general, thermoplastics pressure piping materials behave as ductile materials under load, meaning
that they can undergo considerable deformation without damage. Piping made from such materials has
the ability to bend under a load without breaking and to deform in other ways, while offering continued
resistance. This flexibility allows ductile thermoplastic pipe to activate through pipe deformation
lateral soil forces which create a pipe/soil system capable of safely supporting–even in pipes subject
to little or no internal pressure–the earth and superimposed loads which are encountered in most pipe
installations. However, proper installation techniques are required to ensure that the necessary support
at the bottom and passive soil pressures at the sides of the pipe are developed and maintained.
Soils in which trenches are dug should be examined and identified and the trenches prepared and
backfilled in accordance with sound bedding procedures and this practice.
1. Scope 1.3 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 procedures and references ASTM
responsibility of the user of this standard to establish appro-
specifications for undreground installation of thermoplastic
priate safety and health practices and determine the applica-
pressure piping, 63-in. (1372-mm) nominal size and smaller. It
bility of regulatory limitations prior to use. Specific precau-
is beyond the scope of this practice to describe these proce-
tionary statements are given in Sections 10 and 11.
dures in detail since it is recognized that significant differences
exist in their implementation depending on kind and type of
2. Referenced Documents
pipe material, pipe size and wall thickness, soil conditions, and
2.1 ASTM Standards:
the specific end use.
D 1600 Terminology Relating to Abbreviations, Acronyms,
1.1.1 This practice assumes that over the range of antici-
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and Codes for Terms Relating to Plastics
pated operating conditions, including maximum external load-
D 2487 Test Method for Classification of Soils for Engi-
ing and minimum internal pressure, the soil/pipe system will
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neering Purposes
offer sufficient structural stability to resist possible excessive
D 2488 Practices for Description and Identification of Soils
diametrical deformation, or even collapse. In cases, particu-
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(Visual-Manual Procedure)
larly with large diameter thinner-walled pipe, for which the
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F 412 Terminology Relating to Plastic Piping Systems
validity of this assumption may be in question, the selection of
2.2 AWWA Standard:
pipe and recommended installation conditions should be deter-
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C 651 Standard for Disinfecting Water Mains
mined by a qualified engineer.
1.1.2 Specific pipe characteristics and end-use requirements
3. Terminology
may dictate addition to, or modification of the procedures
3.1 Definitions:
stated or referenced herein.
3.1.1 Definitions are in accordance with Terminology F 412,
1.2 The values stated in inch-pound units are to be regarded
unless otherwise specified. Abbreviated terms are in accor-
as the standard.
dance with Terminology D 1600. Installation terminology used
in this practice is illustrated in Fig. 1.
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This practice is under the jurisdiction of ASTM Committee F17 on Plastic
Piping Systems and is the direct responsibility of Subcommittee F17.61on Water
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Pipe. Annual Book of ASTM Standards, Vol 08.04.
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Current edition approved April 10, 2001. Published May 2001. Originally Available from American Water Works Association, 6666 W. Quincy Ave.,
published as D 2774 – 69 T. Last previous edition D 2774 – 94. Denver, CO 80235.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D 2774
5.3 The use of fittings and joining procedures which are not
covered by a recognized standard is subject to the judgment
and discretion of the purchaser. Each fitting and joining
procedure used should be qualified by investigation, testing,
and experience to establish its suitability and safety for the
intended service. Fittings and joints shall have long-term
pressure capabilities equal to or great
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