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However, if the regulator valve does not seat properly, the inlet pressure will pass down-stream into the consumer piping potentially resulting in:

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If, under normal operating conditions, the outlet pressure rises to approximately 4 kPa, the regulator will lock-up and prevent any further increase.

An OPSO device shuts off the supply of gas at a pre-determined setting. Over-pressure is sensed on the outlet side of the regulator. Manual reset is required to restore supply. Some regulators fitted with OPSO also have internal relief, in which case the OPSO setting must always exceed the relief pressure setting.

In an over-pressure situation, the pressure acting below the diaphragm (at a set point) overcomes the relief spring pressure and gas passes to atmosphere. Some regulators have full relief (under certain conditions) and others have partial relief.

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OPP prevents gas pipework or appliance gas pressures from exceeding a predetermined value, ensuring a safe situation exists in the event of gas pressure regulator malfunction or failure.

Over pressure occurs where piping or equipment is subjected to a pressure exceeding a pre-determined value. For example, where the inlet pressure on a single stage regulator is 1,200 kPa (cylinder pressure) and the outlet is 3 kPa.

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Any other proposed alternatives, such as high pressure switches combined with appropriately rated components, should be discussed with Energy Safe Victoria at the design stage.

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Pressure relief valves are a method of protection installed on the outlet side of a regulator to protect the downstream installation. They have no other function and gas does not flow through them under normal operating conditions. A threaded relief outlet allows the connection of a vent pipe. It is essential that a relief valve be properly sized.

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Any part of the gas installation that is not rated to withstand the inlet pressure to its gas pressure regulator shall be provided with over-pressure protection.

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Regulators with internal pressure relief have a spring-loaded relief opening in the diaphragm bearing plate. Two springs are located beneath the sealing cap and adjustment screw, with the:

Maximum over-pressure is the maximum pressure the installation or any particular portion of the installation, or individual component including appliances, remains safe and for:

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A decision will need to be made by the installation designer, piping installer, or appliance installer about the most appropriate over-pressure protection method. Because each method has advantages and disadvantages, considerations must include the

Over pressure protection prevents the pressure in gas pipework or in gas appliances from exceeding a predetermined value. It will ensure a safe situation exists in the event of malfunction or failure of any gas pressure regulator.

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Regulators with internal (full or partial) pressure relief that are located within a building must be fitted with a vent line terminating outside the building, as per AS/NZS 5601.1, clause 5.11.5.

An OPSS device is installed as a separate component, and is usually located upstream of the regulator (1st or 2nd stage) with a piped connection to sense pressure downstream of the regulator.

If precautions are not taken to limit an over-pressure situation, downstream equipment like appliances and other regulators may be damaged and combustion affected.