By National Health Service Estates

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For each emergency/reserve bank a yellow indicator to be illuminated when the pressure in the bank falls below 14 bar g for nitrous oxide or below 68 bar g for other gases; c. for the pipeline distribution system a red “low pressure” and a red “high pressure” indicator to be illuminated when the respective conditions occur. 19 The following indication of manifold conditions should be provided: Indication Legend a. green “normal” normal b. yellow “duty bank empty, standby running” change cylinders yellow “duty bank empty, standby low” change cylinders immediately yellow “emergency/reserve banks low” reserve low red “pipeline pressure fault” pressure fault c.

1 A VIE can be used for the storage of any cryogenic liquid which can include, in healthcare premises, oxygen, nitrogen and nitrous oxide. The VIE is a cryogenic pressure vessel made of stainless steel supported within an outer vessel, similar to a vacuum flask. The VIE plant has advantages over other oxygen supply systems where high demands exist, and is used whenever it can be shown to be more economical, provided that a suitable location is available. Bulk liquid oxygen installations show significant manual handling savings over conventional cylinder manifolds.

This is permitted, provided that: a. a flow limiting device is provided to protect the medical air system in the event of failure of any downstream component; b. a non-return valve is incorporated to protect the system integrity. 58 The flow requirements should be ascertained and taken into account prior to the installation of the equipment. 59 In ward areas and treatment rooms, all terminal units should be capable of passing 20 l/min, although typically 10 l/min will be required. 60 The diversified flow to each six-bed room is calculated on the basis of numbers of terminal units and that only 33% of the flow at 10 l/min will be required for the remainder.

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