ISO/TC 161 - Controls and protective devices for gas and/or oil

This document specifies safety, constructional and performance requirements and testing of automatic and semi-automatic valves for oil. It applies to automatic and semi-automatic valves which are: — normally closed; — used in combustion plants to interrupt the oil flow with or without delay on closing; — for use with oil types (e.g. middle distillate fuel oil, crude oil, heavy fuel oil or kerosene) without gasoline; NOTE 1 For other oil types (e.g. oil emulsions), additional test methods can be agreed between the manufacturer and the test authority. NOTE 2 Oil types from petroleum refining processes are classified ISO-F-D in ISO 8216-99 and form part of a device having other function(s), such as oil pumps. In this case, the test methods apply to those parts or components of the device forming the automatic and semi-automatic valves, i.e. those parts which are necessary for the closing function. — for use on burners or in appliances using oil; — directly or indirectly operated, electrically or by mechanical or hydraulic means; — fitted with or without closed-position indicator switches. This document covers type testing only.

This document specifies safety, construction, performance and testing requirements for mechanical gas thermostat intended for use with gas burners and gas burning appliances hereafter referred to as “thermostats”. This document applies to mechanical gas thermostats of nominal connection sizes up to and including DN 50 with declared maximum inlet pressures up to and including 50 kPa, for use with natural gas, manufactured gas or liquefied petroleum gas (LPG). It is not applicable to corrosive and waste gases. This document applies to mechanical thermostats: — controlling the gas flow directly or indirectly through an integral gas valve, and which do not require external electrical energy for their operation; — used on gas appliances where the thermostat is not directly exposed to the outdoor environment; and — which are intended for operating control functions. This document covers type testing only.

This document specifies safety, constructional, performance, testing and documentation requirements for gas pressure regulators for use in gas transmission and distribution installations (hereafter referred to as regulators). This document is applicable to regulators with operating pressures greater than 500 kPa and up to and including 10 MPa (100 bar) and nominal diameters up to DN 400 for use with fuel gases as natural gas, manufactured gas, biomethane or liquefied petroleum gas (LPG). This document is applicable to: — test methods which are intended for product type test, routine tests and product surveillance tests; — regulators which use the pipeline gas as a source of control energy unassisted by any external power source; — regulators integrating on the same body a second regulator, used as monitor, complying with the requirements in this document; — regulators integrating a safety shut off device (SSD) according to ISO 23555-3; — regulators incorporating a creep (venting) relief device and/or a vent limiter complying with the requirements in this document. This document does not apply to: — regulators upstream from/on/in domestic gas‑consuming appliances which are installed downstream of domestic gas meters; — regulators designed to be incorporated into pressure control systems used in service lines (pipework from the main pipework in a gas infrastructure to the point of delivery of the gas) with declared volumetric flow rate ≤ 200 m3/h at normal conditions and declared inlet pressure ≤ 500 kPa (5 bar); — industrial process control valves, such as IEC 60534 (all parts); — regulators used in aggressive/sour gas environments (gas environments containing water and H2S are considered sour) or severely corrosive conditions; — regulators in service conditions with renewables (e.g. H2NG with hydrogen more than 10 %) and/or waste gases (e.g. biogas etc.), if additional information is not provided (e. g. contaminant, liquid, etc.).

This document specifies generic safety, constructional, performance, testing and documentation requirements for high pressure controls for use in gas transmission, distribution and installations (hereafter referred to as controls). This document is applicable to controls with operating pressures greater than 500 kPa (5 bar) and up to and including 10 MPa (100 bar) and nominal size up to DN 400 for use with fuel gases as natural gas, manufactured gas, biomethane or liquefied petroleum gas (LPG) in commercial, industrial installations, including fuel gas infrastructures. The test methods given in this document are intended for product type test, routine tests and batch surveillance tests. This document is not applicable to: — controls upstream from/on/in domestic gas-consuming appliances which are installed downstream of domestic gas meters; — controls designed with declared maximum capacity ≤200 m3/h (normal conditions) and declared maximum inlet pressure ≤500 kPa (5 bar), to be incorporated into pressure control systems used in service lines (pipework from the main pipework in a gas infrastructure to the point of delivery of the gas); — industrial process control valves, such as IEC 60534; — controls used in aggressive/sour gas environments (gas environments containing water and H2S are considered sour) or severely corrosive conditions; — controls in service conditions with renewables (e.g. H2NG with hydrogen more than 10 %) and/or waste gases (e.g. biogas, etc.), if additional information is not provided (e.g. contaminant, liquid, etc.).

This document specifies safety, constructional, and performance and testing requirements for thermoelectric flame supervision controls, energized by a thermocouple, intended for use with gas burners and gas-burning appliances, hereafter referred to as “controls”. This document applies to thermoelectric flame supervision controls for gas burners and gas-burning appliances of nominal connection size up to, and including DN 50, that can be used and tested independently of these appliances. These thermoelectric flame supervision controls are suitable for fuel gases, such as natural gas, manufactured gas or liquefied petroleum gas (LPG) at inlet pressures up to and including 50 kPa. It is not applicable to corrosive and waste gases. This document covers type testing only. This document is not applicable to: a) the thermocouple; and b) controls which use auxiliary energy (e.g. electrical energy supplied externally).

This document specifies safety, construction, performance and testing requirements for pressure regulators and pneumatic gas/air ratio pressure regulators intended for use with gas burners and gas-burning appliances. This document applies to pressure regulators and pneumatic gas/air ratio pressure regulators of nominal connection size up to and including DN 250 at inlet pressures up to and including 500 kPa, for use with natural gas, manufactured gas or liquefied petroleum gas (LPG). It is not applicable to corrosive and waste gases. This document is specifically applicable to: — positive, zero and negative pressure regulators which can use auxiliary energy to change the outlet pressure setting; — pneumatic gas/air ratio pressure regulators, which function by controlling a gas outlet pressure in response to an air signal pressure, air signal differential pressure, and/or to a combustion chamber pressure signal; — gas/air ratio pressure regulators, which function by controlling an air outlet pressure in response to a gas signal pressure or a gas signal differential pressure. This document does not cover: — pressure regulators connected directly to gas distribution network or to a container that maintains a standard distribution pressure; — pressure regulators intended to be installed in the open air and exposed to the environment; — mechanically linked gas/air ratio controls; — electronic pressure regulators and gas/air ratio regulators, which are contained in ISO 23552-1. This document covers type testing only. NOTE Annexes A to H reference the relevant annexes of ISO 23550, general requirements and are applicable where required.

ISO 23551-4:2018 specifies safety, constructional and performance requirements of valve-proving systems (VPS), intended for use with gas burners and gas-burning appliances. It also describes the test procedures for checking compliance with these requirements and provides information necessary for the purchaser and user. ISO 23551-4:2018 is applicable to all types of VPS which are used for the automatic detection of leakage in a gas burner section having at least two valves designed in accordance with ISO 23551‑1 and which give a signal if the leakage of one of the valves exceeds the detection limit. ISO 23551-4:2018 is applicable to VPS with a maximum working pressure up to and including 500 kPa for use in systems using fuel gases. ISO 23551-4:2018 is not applicable to VPSs for use in explosive atmospheres. NOTE Provisions for production control are not part of the ISO 23551 series.

ISO 23550:2018 specifies safety, construction, performance and testing requirements for controls for gas burners and gas burning appliances for use with natural gas, manufactured gas or liquefied petroleum gas (LPG). ISO 23550:2018 applies to controls for use at maximum operating pressures up to and including 500 kPa. This document provides the general requirements that are intended to be the basis for the specific control standards found in the ISO 23551 and ISO 23552 series. These include the following: - automatic and semi-automatic gas valves; - gas thermoelectric flame supervision controls; - gas and oil /air ratio controls; - gas pressure regulators; - manual gas valves; - mechanical gas thermostats; - multifunctional gas controls; - air and gas pressure-sensing devices; - gas vent valves; - gas valve-proving systems. ISO 23550:2018 covers type testing only. ISO 23550:2018 is also applicable to Gas Quick Connectors (GQC) for use inside appliances with connections up to, and including DN 25, and a maximum operating pressure up to and including 100 kPa. GQCs include: - tube to tube connections; - tube to control connections; and - tube to fitting connections. ISO 23550:2018 does not apply to mechanical controls for use with liquid fuels. It is also not applicable to corrosive and waste gases.

ISO 23551-10:2016 specifies the safety, design, construction and performance requirements and testing for automatic vent valves (hereafter referred to as "valves") for use with gas burners, gas appliances burning one or more gaseous fuels. It is applicable to valves with declared maximum inlet pressures up to and including 500 kPa (5 bar) of nominal connection sizes up to and including DN 100 (4"). It is applicable to - normally open valves, - electrically operated valves and to valves actuated by fluids where the control valves for these fluids are actuated electrically, but not to any external devices for switching the control signal or actuating energy, and - valves fitted with open position indicator switches. It is not applicable to - valves for burners and appliances using renewables and/or waste gases (i.e. gases having corrosive characteristics), In case valves are in contact with renewables and/or waste gases, it is recommend to use ISO 23551-10:2016 only if explicit information is provided and relevant test methods and requirements are specified. - valves for appliances intended to be installed in the open air and exposed to the outdoor environment, - valves that are connected directly to mains pipe-work or to a container that maintains a standard distribution pressure, and - valves suitable with oil. It is applicable to type testing only.

ISO 23551-8:2016 specifies the safety, construction and performance requirements for multifunctional controls intended for use with gas burners, gas appliances and similar use, hereafter referred to as "MFC". ISO 23551-8:2016 is applicable to MFC with declared maximum inlet pressures up to, and including, 50 kPa (500 mbar) of nominal connection sizes up to, and including, DN 150 for use with one or more fuel gases. MFC consist of two or more functions, at least one of which is a mechanical control, as specified in the relevant control standards.

ISO 23551-5:2014 specifies safety, constructional and performance requirements for manual gas valves intended for use with gas burners and gas-burning appliances, hereafter referred to as ?valves', unless otherwise specified. ISO 23551-5:2014 applies to following types of manual gas valves: manual gas shut-off valve; gas burner valve; appliance connector valve; "delta C" valve. ISO 23551-5:2014 applies to valves for gas burners and gas-burning appliances of nominal connection size up to and including DN 100 that can be used and tested independently of these appliances using fuel gases, as natural gas, manufactured gas or liquefied petroleum gas (LPG) at inlet pressures up to and including 500 kPa. It is not applicable to corrosive and waste gases. ISO 23551-5:2014 covers type testing only.

ISO 23551-1:2012 specifies safety, constructional and performance requirements and testing of automatic and semi-automatic shut-off valves for gas burners, gas appliances and appliances of similar use. It applies to normally closed valves, valves being mounted upstream to gas burners and gas appliances, valves with declared maximum working pressures up to and including 500 kPa, for use on burners or in appliances using fuel gases as natural gas, manufactured gas or liquefied petroleum gas (LPG), valves directly or indirectly actuated, electrically or by mechanical means, valves actuated by hydraulic or pneumatic means, valves where the flow rate is controlled by external electrical signals, either in discrete steps or propor­tional to the applied signal, and valves fitted with closed position indicator switches. ISO 23551-1:2012 covers type testing only.

ISO 23552-1:2007 specifies safety, construction and performance requirements for electronic fuel/air ratio control systems intended for use with gas or oil burners and gas or oil burning appliances. ISO 23552-1:2007 also describes the test procedures for evaluating these requirements and specifies information necessary for installation and use. ISO 23552-1:2007 is applicable only to closed-loop fuel/air ratio controls and does not differentiate into classes by heat input. ISO 23552-1:2007 applies to electronic fuel/air ratio control systems that can be tested independently or as part of an appliance or as part of a burner.

ISO 23551-9:2015 specifies safety, constructional, and performance requirements and testing of mechanical gas thermostat for gas burners, gas appliances, and similar use hereafter referred to as "thermostats". ISO 23551-9:2015 covers type testing only. ISO 23551-9:2015 applies to mechanical gas thermostats of nominal connection sizes up to and including DN 50 with declared maximum inlet pressures up to and including 50 kPa for burners and gas-burning appliances using fuel gases as natural gas, manufactured gas, and liquefied petroleum gas (LPG). ISO 23551-9:2015 applies to mechanical thermostats controlling the gas flow directly or indirectly through an integral gas valve and which do not require external electrical energy for their operation. ISO 23551-9:2015 only applies to mechanical thermostats used on gas appliances where the thermostat is not directly exposed to the outdoor environment. ISO 23551-9:2015 only applies to mechanical thermostats which are intended for operating control functions.

ISO 23551-6:2014 specifies safety, constructional, and performance requirements for thermoelectric flame supervision controls, energized by a thermocouple, intended for use with gas burners and gas-burning appliances, hereafter referred to as "controls". ISO 23551-6:2014 applies to thermoelectric flame supervision controls for gas burners and gas-burning appliances of nominal connection size up to, and including DN 50, that can be used and tested independently of these appliances. These thermoelectric flame supervision controls are suitable for fuel gases, such as natural gas, manufactured gas, or liquefied petroleum gas (LPG) at inlet pressures up to and including 50 kPa. ISO 23551-6:2014 covers type testing only. It is neither applicable to the thermocouple nor to controls which use auxiliary energy (e.g. electrical energy supplied externally).

ISO 23553-1:2014 specifies safety, constructional and performance requirements and testing of automatic and semi-automatic valves for oil. It applies to automatic and semi-automatic valves which are: -normally closed; -used in combustion plants to interrupt the oil flow with or without delay on closing; -for use with oil types (e.g. middle distillate fuel oil, crude oil, heavy fuel oil or kerosene) without gasoline; -for use on burners or in appliances using oil; -directly or indirectly operated, electrically or by mechanical or hydraulic means; -fitted with or without closed-position indicator switches. ISO 23553-1:2014 covers type testing only.

ISO 23550:2011 specifies safety, constructional and performance requirements and testing of safety control or regulating devices and sub-assemblies or fittings for burners and gas-burning appliances using such fuel gases as natural gas, manufactured gas or liquefied petroleum gas (LPG). It is not applicable to corrosive and waste gases. ISO 23550:2011 is applicable to the following controls: automatic shut-off valves; burner controls; flame supervision devices; gas/air ratio controls; pressure regulators; manual taps; mechanical thermostats; multifunctional controls; pressure-sensing devices; valve-proving systems; zero regulators. The test methods given in ISO 23550:2011 are intended for product type testing. Tests intended for production testing are not specifically included.

ISO 23553-1 specifies safety, constructional and performance requirements, and testing of safety shut-off devices, for liquid fuels. ISO 23553-1 covers type testing only. It applies to safety shut-off devices which: are designed as e.g. automatic valves or fast-closing devices; are used in combustion plants to interrupt the flow of liquid fuels with or without delay on closing and with or without delay on opening; are for use with fuel oils; form part of a device having other function(s), such as oil pumps — in this case the test methods apply to those parts or components of the device forming the safety shut-off device, i.e. those parts which are necessary for the closing function; have declared maximum working pressures up to and including 5 000 kPa, for use on burners or in appliances using liquid fuels; are directly or indirectly operated electrically or by mechanical or hydraulic means; and are fitted with or without closed-position indicator switches. The methods of test given in ISO 23553-1 are intended for product type testing.

ISO 23551-2:2006 specifies safety, constructional and performance requirements for pressure regulators intended for use with gas burners and gas burning appliances. It also describes the test procedures for checking compliance with these requirements and provides information necessary for the purchaser and user. ISO 23551-2:2006 applies to pressure regulators for gas burners and gas burning appliances of nominal connection size up to and including DN 250 that can be used and tested independently of these appliances. These regulators are suitable for fuel gases, such as natural gas, manufactured gas or liquefied petroleum gas (LPG) at inlet pressures up to and including 50 kPa. ISO 23551-2:2006 covers type testing only. ISO 23551-2:2006 does not cover regulators connected directly to the mains pipe work or to a container that maintains a standard distribution pressure; regulators installed outdoors and exposed to the environment; regulators which use electrical auxiliary energy.

ISO 23551-1:2006 specifies safety, constructional and performance requirements and testing of automatic valves (hereafter referred to as valves) for gas burners, gas appliances and similar use. ISO 23551-1:2006 covers type testing only. ISO 23551-1:2006 applies to valves with declared maximum working pressures up to and including 500 kPa, for use on burners or in appliances using fuel gases as natural gas, manufactured gas or liquefied petroleum gas (LPG). ISO 23551-1:20061 applies to valves directly or indirectly operated electrically or by mechanical means. ISO 23551-1:2006 applies to valves actuated by fluids e.g. pneumatic, hydraulic. ISO 23551-1:2006 applies to valves where the flow rate is controlled by external electrical signals, either in discrete steps or proportional to the applied signal. ISO 23551-1:2006 applies to valves fitted with closed position indicator switches.

ISO 23551-4:2005 specifies safety, constructional and performance requirements of valve-proving systems, hereafter referred to as VPS, intended for use with gas burners and gas-burning appliances. It also describes the test procedures for checking compliance with these requirements and provides information necessary for the purchaser and user. ISO 23551-4:2005 applies to all types of VPS which are used for the automatic detection of leakage in a gas burner section having at least two valves designed in accordance with ISO 23551-1 and which give a signal if the leakage of one of the valves exceeds the detection limit. ISO 23551-4:2005 applies to VPSs with a declared maximum working pressure up to and including 500 kPa for use in systems using fuel gases. ISO 23551-4:2005 does not apply to VPSs for use in explosive atmospheres.

ISO 23551-3:2005 specifies the safety, construction and performance requirements for gas/air ratio controls, pneumatic type, for inlet pressures up to and including 50 kPa, of a nominal connection size up to and including DN 250, intended for use with gas appliances using fuel gases as natural gas, manufactures gas or liquefied petroleum gas (LPG). It also describes the test procedures for evaluating these requirements and specifies information necessary for installation and use. It is applicable to gas/air ratio controls for gas-burning appliances that can be tested independently of the appliance. It is applicable to gas/air ratio controls which function by controlling a gas pressure (or differential pressure) output in response to an air pressure (or differential pressure) and to a furnace back pressure signal input; but gas/air ratio controls which change the air pressure in response to the gas pressure are not excluded. It is not applicable to mechanically linked valves and electronic systems.

ISO 23550:2004 specifies safety, constructional and performance requirements and testing of safety control or regulating devices and sub-assemblies or fittings (hereafter referred to as controls) for burners and gas-burning appliances using fuel gases as natural gas, manufactured gas or liquefied petroleum gas (LPG). It is not applicable to corrosive and waste gases. ISO 23550:2004 is applicable to the following controls: -- automatic shut-off valves; -- burner controls; -- flame supervision devices; -- gas/air ratio controls; -- pressure governors; -- manual taps; -- mechanical thermostats; -- multifunctional controls; -- pressure-sensing devices; -- valve-proving systems; -- zero governors. The methods of test given in ISO 23550:2004 are intended for product type testing. Tests intended for production testing are not specifically included. ISO 23550:2004 is intended to be used in conjunction with the specific control standards of the ISO 23551 series.