scope:

This Standard sets down the minimum requirements (see Note 1) applicable to gas fired open flued and room sealed appliances, including:

• hot water boilers of net heat input exceeding 70 kW

• steam boilers

• thermal fluid heaters

• storage water heaters of net heat input exceeding 70 kW

• warm air heaters of net heat input exceeding 70 kW

• radiant heaters.

This Standard covers such equipment for net heat input not exceeding 20 MW.

Note 1: This Standard specifies the minimum acceptable requirements for safe installation and use, as such any relaxation from these requirements needs to be referred to IGEM (see Sub-Section 1.8).

Note 2: This Standard applies to instances where an appliance installation (not exceeding 70 kW net heat input) is associated with other appliances in a plant room where the total net heat input exceeds 70 kW. However it is to be noted that this Standard incorporates more stringent requirements than those in BS 5440 for appliance installations below 70 kW.

Note 3: This Standard does not apply to flueless heaters such as direct-fired radiant and direct-fired warm air heaters (see BS 6896 or BS 6230) or applications within process plant such as ovens/furnaces (see IGE/UP/12), although certain requirements may be of relevance.

Note 4: The ratio of gross to net heat input is, approximately, 1.11:1, 1.09:1 and 1.08:1 for appliances on Natural Gas (NG)/Towns Gas, propane and butane respectively. For the purposes of this Standard, where gross heat inputs represent requirements of existing standards, they are converted to net using a conversion factor in all cases. For example, 600 kW gross heat input = 600 ÷ 1.11 = 545 kW net heat input for NG.

Note 5: For appliances of heat input not exceeding those stated, installed in rooms and compartments, the appropriate British Standard applies. However, where the appliance is located within a heated space such as within a factory or warehouse, clause 7.5.4 or Sub-Section 7.6 applies with respect to alternative ventilation arrangements.

This Standard covers the design aspect of flues and exhausts for gas engines exceeding 70 kW net heat input and all gas turbines, both not exceeding 20 MW. The ventilation requirements for such appliances are covered by IGE/UP/3 and IGE/UP/9 respectively and the detailed requirements of the manufacturer's instructions.

This Standard applies to individual or groups of appliances installed in a single space.

Note: The scope includes multiples of small appliances, for example 2 off 36 kW net heat input appliances. For chimneys/flues and ventilation for smaller installations of single appliances not exceeding 70 kW net, BS 5440 applies.

This Standard covers flammable gases, as defined in BS EN 437, for example, NG, manufactured gas, bio-gases, Liquefied Petroleum Gas (LPG) and LPG/Air.

Note: This Standard also applies to the installation of bio-fuelled appliances in conjunction with existing or new gas appliances (for more information see clause 5.1.6, Section 12 and Appendix 6).

This Standard applies to new installations and it is not the intention to apply any requirements retrospectively. However, if existing plant is being upgraded, it is recommended that the intent of this Standard be followed as far as reasonably practicable. A risk assessment is required whenever changes are proposed for any plant (see IGE/SR/24 and IGEM/UP/16).

This Standard applies to the essential aspects of installing appliances and to retro-fitting of burners to existing appliances.

Note: This Standard does not cover the water, steam or warm air elements of installations (see Sub-Section 1.5).

All pressures are gauge pressures unless otherwise stated.

All heat inputs are net heat inputs unless otherwise stated.

Italicised text is informative and does not represent formal requirements.

Appendices are generally informative and do not represent formal requirements unless specifically referenced in the main sections by the prescriptive terms "must", "shall" or "should".