BS 6891:2015+A1:2019
$215.11
Specification for the installation and maintenance of low pressure gas installation pipework of up to 35 mm (R114) on premises
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 98 |
This British Standard specifies the design, installation, commissioning and maintenance of gas installation pipework carrying 2nd and 3rd family gas of up to 35 mm (R 1¼) on premises, including residential park homes (2nd and 3rd family gas) and caravan holiday homes (2nd family gas) (see Table 1 and examples in Figure 1 to Figure 3; see also Figure 4).
NOTE 1 The principles of the standard can also be applied to the design, installation, commissioning and maintenance of gas installation pipework carrying 1st family gas.
NOTE 2 Annex A gives a method for calculating pipe sizes. Annex B discusses the sulfidation of natural gas installations, while Annex C summarizes the conclusions of a report on gas in intermediate floors. Guidance on determining whether an area can be deemed a “protected area” is given in Annex D. Requirements for LPG final stage regulator and safety devices are specified in Annex E. Annex F discusses the need for gas pipework design and installation for commercial installations to satisfy regulatory requirements regarding explosive atmospheres.
This British Standard is not applicable to:
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service pipework and distribution systems;
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pipework contained within an appliance;
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bulk storage vessels;
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LPG pipework installed in leisure accommodation vehicles and for accommodation purposes in vehicles in accordance with BS EN 1949;
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boats, yachts and other vessels;
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gas pipework supplying or within appliances having their own gas supply, such as mobile heaters; or
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gas pipework supplying or within catering establishments covered by BS 6173.
Table 1 Pipework covered by BS 6891
A) Dependent upon material type.
B) 1 bar = 105 N/m2 = 100 kPa.
NOTE Unless stated otherwise:
a) the diameter for pliable corrugated (stainless-steel) tubing refers to the inside diameter; and
b) the diameter for carbon, stainless-steel tubing, copper and polyethylene (PE) refers to the outside diameter.
Figure 1 2nd family gas installation with an internal meter
Key
Figure 2 3rd family gas installation with cylinders
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Figure 3 3rd family gas installation with bulk storage vessels
Key
Figure 4 Selection of applicable standard(s) for gas installations
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | Foreword |
| 7 | 1 Scope |
| 8 | Table 1 — Pipework covered by BS 6891 Figure 1 — 2nd family gas installation with an internal meter |
| 9 | Figure 2 — 3rd family gas installation with cylinders Figure 3 — 3rd family gas installation with bulk storage vessels |
| 10 | Figure 4 — Selection of applicable standard(s) for gas installations 2 Normative references |
| 13 | 3 Terms and definitions |
| 17 | 4 Competence |
| 18 | Table 2 — Approval bodies and statutory regulations by country/territory Table 3 — Competence requirements by country/territory |
| 19 | 5 Design and planning |
| 20 | Figure 5 — Sizing pipework — Design maximum pressure loss for typical installations |
| 21 | 6 Materials and components |
| 23 | 7 Jointing |
| 25 | 8 Installation |
| 27 | Figure 6 — Non‑contact voltage detector (single pole) — Example |
| 28 | Figure 7 — Use of temporary continuity bond |
| 32 | Figure 8 — Position of main protective bonding conductor connection |
| 33 | Figure 9 — Typical notification where main protective bonding conductor is found not to be present |
| 34 | Figure 10 — AECV positions |
| 36 | Figure 11 — Typical exterior pipework |
| 38 | Table 4 — Maximum interval between pipework supports |
| 39 | Figure 12 — Notching and drilling of metal web joists and timber-engineered joists |
| 40 | Figure 13 — Limits for notching and drilling of solid timber floor joists |
| 44 | Figure 14 — Pipework in concrete compartment floors |
| 45 | Figure 15 — Pipework in timber fire compartment floors |
| 47 | Figure 16 — Typical examples of pipework installed in solid floors |
| 50 | Figure 17 — Typical examples of pipework installed in solid construction walls |
| 54 | Figure 18a — Typical examples of pipework installed in timber and light steel-framed construction walls |
| 55 | Figure 18b — Typical examples of pipework installed in timber and light steel-framed construction walls |
| 56 | Figure 18c — Typical examples of pipework installed in timber and light steel-framed construction walls |
| 57 | Figure 19 — Limits for drilling of wall studding |
| 59 | Table 5 — Buried external pipework |
| 60 | Figure 20 — Buried pipework |
| 62 | Table 6 — Free area of ventilation openings |
| 63 | Figure 21 — Cross‑sectional area of duct |
| 64 | Figure 22 — Typical pipework in multi‑storey buildings containing flats or maisonettes |
| 66 | Figure 23 — Copper and steel pipe in a protected area |
| 69 | Figure 24 — Typical method of accommodating movement for pipework passing through a masonry/timber-frame wall 9 Installation of flexible hoses, tubing, assemblies and their connections |
| 71 | Figure 25 — Identification of hoses, tubing and assemblies for use with LPG |
| 72 | 10 Commissioning |
| 73 | Table 7 — Operating pressure (LPG) |
| 75 | 11 Maintenance |
| 76 | Annex A (informative) Guide to sizing pipework installations |
| 77 | Table A.1 — Approximate natural gas pressure loss data (mbar/m) – copper tube |
| 78 | Table A.2 — Approximate natural gas pressure loss data (mbar/m) – steel tube |
| 79 | Table A.3 — Approximate LPG (propane) pressure loss data (mbar/m) – copper tube |
| 81 | Table A.4 — Approximate LPG (propane) pressure loss data (mbar/m) – steel tube |
| 82 | Table A.5 — Typical allowances for pressure loss of fittings |
| 83 | Figure A.1 — Example natural gas installation |
| 84 | Table A.6 — Sizing results |
| 85 | Annex B (informative) Sulfidation of natural gas installations |
| 86 | Annex C (informative) Summary and principal conclusions of the Advantica Research Project, Gas in intermediate floors, Report Number 6699 [28] |
| 88 | Annex D (informative) Protected area |
| 89 | Annex E (normative) LPG Final stage regulator and safety devices |
| 90 | Table E.1 — Pressure characteristics of various regulators (LPG) |
| 92 | Table E.2 — Minimum proximity distances for relief valve vent tips (millimetres) Annex F (informative) Dangerous Substances and Explosive Atmospheres Regulations [17], [18] |
| 94 | Bibliography |
