ISO 4437-3:2014

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Status: Check Published
Norwegian title: Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
English title: Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
Item type: Standard
Language: Engelsk
Edition: 1 (2014-01-13)
Supersedes: ISO 8085-1:2001 Alert Withdrawn
ISO 8085-2:2001 Alert Withdrawn
ISO 8085-2:2001/Cor 1:2001 Alert Withdrawn
ISO 8085-3:2001 Alert Withdrawn
ISO 8085-3:2001/Cor 1:2007 Alert Withdrawn
ISO 4437:2007 Alert Withdrawn
ISO 8085-1:2001/Cor 1:2008 Alert Withdrawn
ISO 8085-2:2001/Cor 2:2008 Alert Withdrawn
ISO 8085-3:2001/Cor 2:2008 Alert Withdrawn
Number of pages: 31

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Scope: <p>This part of <std std-id="iso:std:iso:4437:en" type="undated"><std-ref>ISO 4437</std-ref></std> specifies the characteristics of fusion fittings made from polyethylene (PE) as well as of mechanical fittings for piping systems in the field of the supply of gaseous fuels.</p><p>It also specifies the test parameters for the test methods referred to in this part of <std std-id="iso:std:iso:4437:en" type="undated"><std-ref>ISO 4437</std-ref></std>.</p><p>In conjunction with <std std-id="iso:std:iso:4437:-1:en" type="undated"><std-ref>ISO 4437-1</std-ref></std>, <std std-id="iso:std:iso:4437:-2:en" type="undated"><std-ref>ISO 4437-2</std-ref></std>, <std std-id="iso:std:iso:4437:-4:en" type="undated"><std-ref>ISO 4437-4</std-ref></std>, and <std std-id="iso:std:iso:4437:-5:en" type="undated"><std-ref>ISO 4437-5,</std-ref></std> it is applicable to PE pipes, fittings and valves, their joints, and joints with components of PE and other materials intended to be used under the following conditions:</p><list list-type="alpha-lower"><list-item><label>a)</label><p>the maximum operating pressure (MOP) is based on the design stress, determined from the compound minimum required strength (MRS) divided by the <italic>C</italic> factor, and taking into account rapid crack propagation (RCP) requirements;</p></list-item><list-item><label>b)</label><p>a temperature of 20 °C as reference temperature for the design basis.</p></list-item></list><non-normative-note><label>NOTE 1</label><p>For other operating temperatures, derating coefficients are given in <std><std-ref>ISO 4437-5:2014</std-ref></std>.</p></non-normative-note><non-normative-note><label>NOTE 2</label><p>It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes.</p></non-normative-note><p>This part of <std std-id="iso:std:iso:4437:en" type="undated"><std-ref>ISO 4437</std-ref></std> is applicable for fittings of the following types:</p><list list-type="bullet"><list-item><label>—</label><p>electrofusion socket fittings;</p></list-item><list-item><label>—</label><p>electrofusion saddle fittings;</p></list-item><list-item><label>—</label><p>spigot end fittings (for butt fusion using heated tools and electrofusion socket fusion);</p></list-item><list-item><label>—</label><p>socket fusion fittings;</p></list-item><list-item><label>—</label><p>mechanical fittings.</p></list-item></list><p>The fittings can for example be in the form of couplers, saddles, equal and reduced tees, reducers, elbows, bends, or end caps.</p><non-normative-note><label>NOTE 3</label><p>Fabricated fittings are normally not used for gas applications except for larger dimensions or in the absence of other solutions. Guidance can be found in <std std-id="iso:std:iso:4427:-3:ed-1:en:clause:B" type="dated"><std-ref>ISO 4427-3:2007</std-ref>, Annex B</std>.<sup>[</sup><xref ref-type="bibr" rid="ref_2"><sup>2</sup></xref><sup>]</sup></p></non-normative-note>
Committee: SN/K 084
Adopted: 2014-01-13
ICS: 75.200 - Utstyr til håndtering av petroleumsprodukter og naturgass
83.140.30 - Plastrør, - deler og -ventiler