BS 6173:2020 pdf download – Installation and maintenance of gas‑fired catering appliances for use in all types of catering establishments (2nd and 3rd family gases) — Specification
7.1.3To prevent corrosion, the pipework, associated fittings and supports installed shall be corrosion-resistant or painted with a finish impervious to greases and cleaning chemicals.
7.1.4 Where pipework passes through a sleeve to enter the catering area, the sleeve shall protrude not less than 25 mm from the finished surface of the wall or floor where water or chemical cleaning materialscould be used.
7.1.5 Sleeves shall be sealed with a flexible sealant at the kitchen side to avoid corrosive cleaning substances building up inside the sleeve.
NOTE Any corrosion protection applied to pipework should not prevent the pipework being identified as carryinga fuel gas (see 7.1.6).
7.1.6 Pipework shall be clearly identified as carrying a fuel gas by painting the pipework yellow ochre in
accordance with BS 4800:201108C35 or primrose yellow in accordance with BS 4800:201110E53,or, alternatively, by applying a “Gas” marker tape at suitable intervals along the pipework.
NOTE Further information on identifying gas pipework can be found in IGEM/UP/2[N5] or TechnicalBulletin 031 [29].
Pipework shall be installed with a minimum of 25 mm between the pipework and an adjacent surface(such as a wall) to enable the pipework and the surface behind it to be cleaned.
NOTE Metallic pipe supports are advised to achieve the 25 mm clearance.
7.1.8 Semi-rigid corrugated stainless-steel tube (CSST) shall not be used as the final gas appliance
7.1.9 Any copper pipework fitted to a flexible connection shall be supported to prevent damage to the
pipework when any appliance is moved.
7.1.10 LPG cylinder systems shall prevent the gas supply from being interrupted in normal use, the
use of automatic changeover valves.
All valves shall be installed in accordance with IGEM/UP/2 [N5] or BS 6891, as appropriate.LPGinstallations shall be in accordance with UKLPGCoP 22 [N6] or CoP 24 Part 3[N1]as appropriate.
7.2.2 Manual isolation valves A manual isolation valve shall be installed on the installation pipework to each catering area.
NOTE The isolation valve is fitted to provide isolation for routine maintenance/alterations, testing and purgingof the downstream installation. The manual valve shall be sited as near as practicable to the exit in a readily accessible location. A pressure test point shall be installed within 300 mm downstream of the manual isolation valve to facilitate tightness testing. In addition to the valves required in IGEM/UP/2 [N5] or BS 6891, as appropriate, a manual isolation valve shall be included in the pipework to enable each individual appliance to be isolated for servicingand cleaning.
NOTE This is applicable to individual appliances, appliances suited and commercial suites (a number ofappliances pre-installed into one complete assembly as supplied).The self-sealing coupling used for the flexibleconnection cannot be regarded as the single manual means of isolation,unless a quarter-turn manual means ofisolation is incorporated as part of the self-sealing coupling assembly. The valve should be a single quarter-turnlever valve that falls to the closed position.
7.3Additional emergency control valve (AECV)
An additional emergency control valve shall be fitted where the emergency control valve (ECV) islocated remotely from the dwelling/building it serves. The fitting of an AECV shall be installed inaccordance with IGEM/UP/2 [N5] or BS 6891, as appropriate.
NOTE1The manual valve installed to each catering facility, sited near to the exit in a readily accessible location,may also be used as an AECV.
NOTE2 Where an existing catering installation is being upgraded and installation pipework already enters thekitchen at the nearest point of entry at a height which is not readily accessible for manual valve operation (in theevent of an emergency) an Automatic Isolation Valve (AIV) should be used.See 7.4.3.
7.4Automatic isolation valve (AIV) -solenoid valve
7.4.1 An automatic isolation valve (AIV), conforming to BS EN 161,shall be fitted to the installation
pipework serving each catering area. The automatic isolation valve shall be installed as near aspracticable to the point of entry to the catering area downstream of a manual isolation valve andupstream of the gas appliances.
7.4.2 An AIV shall be used to shut-off/isolate the gas supply to catering appliance(s) as part of the interlock
NOTE1 Interlocking is required to meet the requirements of The Gas Safety (Installation and Use) Regulations1998 [1] and IGEM/uP/19 [N3].
NOTE2 lIn large catering facilities, separate groups of appliances may operate with dedicated independentventilation and extract canopy systems.An AlV ftted upstream to each separate group of appliances allowslocalized shut down within the catering area and allows other appliances to remain in use.
7.4.3 In the event of an emergency, the automatic isolation valve installed as near as practicable to the
point of entry to the catering area shall be operated by a safety control or emergency stop button(s)located near to the exit(s) of the catering area.