ASTM D1998-06
(Specification)Standard Specification for Polyethylene Upright Storage Tanks
Standard Specification for Polyethylene Upright Storage Tanks
ABSTRACT
This specification covers flat-bottom, upright, cylindrical tanks molded in one-piece seamless construction by rotational molding. The tanks are molded from polyethylene for above ground, vertical installation and are capable of containing aggressive chemicals at atmospheric pressure. This specification does not cover the design of vessels intended for use at pressures other than atmospheric pressure. Furthermore, this specification does not cover the design of portable tanks and is not for vessels intended for use with liquids heated above their flash points in continuous service. Special design considerations not covered in this specification shall be given to vessels subject to superimposed mechanical forces, such as seismic forces, wind load or agitation; to vessels subject to service above specified temperature; and vessels subject to specified superimposed pressure of water. Low-temperature impact test shall be performed on rotational-molded polyethylene tanks. The test method is used on tanks molded from both the crosslinked and non-crosslinked polyethylenes. Dart drop impact test shall be performed to determine the quality of the tank. O-xylene-insoluble fraction or gel test shall be performed on crosslinked polyethylene. Visual inspection and water test shall also be performed on the samples.
SCOPE
1.1 This specification covers flat-bottom, upright, cylindrical tanks molded in one-piece seamless construction by rotational molding. The tanks are molded from polyethylene for above ground, vertical installation and are capable of containing aggressive chemicals at atmospheric pressure. Included are requirements for materials, properties, design, construction, dimensions, tolerances, workmanship and appearance. Tank capacities are from 1900 L [500 gal] up.
1.2 This specification does not cover the design of vessels intended for use at pressures other than atmospheric pressure. Furthermore, this specification does not cover the design of portable tanks. It is also not for vessels intended for use with liquids heated above their flash points, or temperatures above 66C [150°F] for Type I tanks and 60°C [140°F] for Type II tanks for continuous service. NFPA Standards 30 and 31 shall be consulted for installations that are subject to the requirements of these standards.
1.3 Special design considerations not covered in this specification shall be given to vessels subject to superimposed mechanical forces, such as seismic forces, wind load or agitation; to vessels subject to service temperature in excess of 23°C [73.4°F]; and vessels subject to superimposed pressure exceeding 25.4 cm [10 in.] of water or 2.5 10 3 MPa [0.36 psi].
1.4 The values stated in SI units are to be regarded as the standard. The values given in brackets are for information only. There is no similar or equivalent ISO standard.
The following precautionary caveat pertains only to the test methods portion, Section 11, of this specification: 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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D1998 −06
StandardSpecification for
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Polyethylene Upright Storage Tanks
This standard is issued under the fixed designation D1998; 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* 2. Referenced Documents
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1.1 This specification covers flat-bottom, upright, cylindri- 2.1 ASTM Standards:
cal tanks molded in one-piece seamless construction by rota- D618Practice for Conditioning Plastics for Testing
tional molding. The tanks are molded from polyethylene for D883Terminology Relating to Plastics
above ground, vertical installation and are capable of contain- D1693Test Method for Environmental Stress-Cracking of
ingaggressivechemicalsatatmosphericpressure.Includedare Ethylene Plastics
requirements for materials, properties, design, construction, D2837Test Method for Obtaining Hydrostatic Design Basis
dimensions, tolerances, workmanship and appearance. Tank forThermoplasticPipeMaterialsorPressureDesignBasis
capacities are from 1900 L [500 gal] up. for Thermoplastic Pipe Products
D3892Practice for Packaging/Packing of Plastics
1.2 This specification does not cover the design of vessels
D4703Practice for Compression Molding Thermoplastic
intended for use at pressures other than atmospheric pressure.
Materials into Test Specimens, Plaques, or Sheets
Furthermore, this specification does not cover the design of
E691Practice for Conducting an Interlaboratory Study to
portable tanks. It is also not for vessels intended for use with
Determine the Precision of a Test Method
liquids heated above their flash points, or temperatures above
F412Terminology Relating to Plastic Piping Systems
66°C [150°F] for Type I tanks and 60°C [140°F] for Type II
2.2 OSHA Standard:
tanks for continuous service. NFPA Standards 30 and 31 shall
29 CFR 1910.106 Occupational Safety and Health
be consulted for installations that are subject to the require-
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Administration, Flammable and Combustible Liquids
ments of these standards.
2.3 ANSI Standard:
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1.3 Special design considerations not covered in this speci-
B-16.5Pipe Flanges and Flanged Fittings
fication shall be given to vessels subject to superimposed
2.4 NFPA Standards:
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mechanical forces, such as seismic forces, wind load or
30Flammable and Combustible Liquid Code
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agitation; to vessels subject to service temperature in excess of
31Installation of Oil Burning Equipment
23°C [73.4°F]; and vessels subject to superimposed pressure
−3
3. Terminology
exceeding 25.4 cm [10 in.] of water or 2.5×10 MPa [0.36
psi].
3.1 Definitions: Definitions are in accordance with Termi-
nologies D883 and F412 and the Association of Rotational
1.4 The values stated in SI units are to be regarded as the
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Molders (ARM) Glossary of Terms, unless otherwise indi-
standard.Thevaluesgiveninbracketsareforinformationonly.
cated.
NOTE 1—There is no similar or equivalent ISO standard.
3.2 Definitions of Terms Specific to This Standard:
1.5 The following precautionary caveat pertains only to the
3.2.1 impact failure, n—any crack in the test specimen
test methods portion, Section 11, of this specification: This
resulting from the impact and visible in normal room lighting
standard does not purport to address all of the safety concerns,
to a person with normal eyesight.
if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
practices and determine the applicability of regulatory limita-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
tions prior to use.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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Available from Occupational Safety and Health Administration (OSHA), 200
Constitution Ave., NW, Washington, DC 20210.
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This specification is under the jurisdiction of ASTM Committee D20 on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic 4th Floor, New York, NY 10036.
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Materials (Section D20.15.01). Available from National Fire Protection Association (NFPA), 1 Batterymarch
Current edition approved Sept. 1, 2006. Published October 2006. Originally Park, Quincy, MA 02269-9101.
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approved in 1991. Last previous edition approved in 2004 as D1998-04. DOI: Available from Association of Rotational Molders, 2000 Spring Road, Suite
10.1520/D1998-06. 511, Oak Brook, IL 60523.
*A Summary of Changes section appears at the end of this standard
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