Industry Standard Update 115

IGEM/UP/19 Edition 2 Design and application of interlock devices and associated systems used with gas appliance installations in commercial catering establishments. Date issued: 3 November 2022

This Industry Standard Update provides an overview of the recently published Industry Standard IGEM/UP/19 Ed 2, Design and application of interlock devices and associated systems used with gas appliance installations in commercial catering establishments.

Introduction

An updated version of IGEM/ UP/19(1) (communication 1865) has been published. This revised publication supersedes IGEM/ UP/19(2) (communication 1777), which has been withdrawn.

The revision to this standard comes into effect immediately.

To allow registered businesses time to carry out internal update training to reflect the technical changes in the updated standard, Gas Safe Register will inspect to the requirements of this standard from 1 January 2023. However, this should not restrict businesses from applying the specification sooner.

Scope

IGEM/UP/19 details the requirements for air flow and interlock devices and their associated systems being used with gas appliances in new commercial catering installations, and for replacement or extension to existing installations. It does not apply to mobile catering or event catering – these are detailed in Liquid Gas CoP 24 Part 3(3) .

General

Significant and minor amendments have been made throughout the standard, and the main details are below.

To assist the engineer in the correct selection of which standard to use in their situation, ‘Figure 1: Aid for selection of gas catering standard’ has been added.

Type A and Type B appliance statements have been removed from sections 4.1.2 and 4.1.3. The requirement to interlock type B appliances means that type A appliances would also be interlocked and therefore there is no reason to detail them separately. This removal is repeated throughout the standard.

The design requirements in section 4.2 have been amended to include subsection 4.2.1.2, where the details of carbon dioxide sensors can be found.

In section 4.3, Variable Speed Drives (VSD) have been amended to Demand Controlled Kitchen Ventilation (DCKV). These DCKV systems may be more energy efficient and reduce noise by modulating the ventilation rate to the demand. Additions include the requirement for DCKV systems to comply with clause 11 from BS 6173:2022(4) Installation and maintenance of gas-fired catering appliances for use in all types of catering appliances. Maximum air flow rates shall be assessed to BESA Specification for Kitchen Ventilation Systems DW/172(5) , by using the thermal convection method.

There have been considerable amendments to 5.1 and 5.2: again references to Type A and Type B appliances have been removed. In 5.1.2.1 the supply flow design is now 75 to 95 per cent of the total extract volume and any DCKV system shall maintain the supply air ratio at all speeds.

There are small changes to the illustrations and flow charts. Figure 2B is now labelled 3B and has been amended slightly to give a carbon dioxide detector fitted at approximately 2 meters from the floor. Figures 4 and 5: these risk assessment flowcharts deal with NEW or EXISTING installations and have slight amendments – they replace the previous versions.

An additional note in 7.1 has been added for the actions required by the responsible person in the kitchen when a gas detection system alarm is triggered.

Appendix 3 is now titled ‘Examples of typical interlock arrangements’, and there are new illustrations which replace the previous versions in appendix 4. Appendix 4, 5 and 6 have been removed.

Summary As previously stated, this Industry Standard Update only gives a brief overview of the information contained in the amended standard. Registered businesses should be aware that they have a responsibility to ensure that they are fully apprised of all the requirements of the whole published standard and their practical application.

Bibliography

(1) IGEM/UP/19 (communication 1865) Edition 2 Design and application of interlock devices and associated systems used with gas appliance installations in commercial catering establishments. (2) IGEM/UP/19 (communication 1777) with amendment January 2015 Design and application of interlock devices and associated systems used with gas appliance installations in commercial catering establishments.

(3) Liquid Gas CoP 24 Part 3 2017

Use of LPG for commercial catering events, street food and mobile catering. (4) BS 6173:2020 Installation and maintenance of gas-fired catering appliances for use in all types of catering establishments (2nd and 3rd family gases) - Specification. (5) Building Engineering Services Association Specification for Kitchen Ventilation Systems DW/172.