Petroleum Refining: Materials And Equipment (Institut by P. Trambouze

By P. Trambouze

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12 A VIE installation comprises: a. a vacuum insulated tank to store the bulk liquid at the appropriate operating pressure; b. a pressure raising system to maintain the VIE operating pressure; c. a vaporiser system to convert the liquid into gaseous product at ambient temperature. 13 The control panel and instrumentation for the VIE are normally mounted centrally at the front of the vessel. Pressure vessel details are given on a plate mounted on the outer vessel. The vessel must be clearly labelled with the product name.

In the event of such a cable fault, a red “system fault” lamp should be illuminated on the alarm signal status unit, together with the appropriate alarm condition. 23 A permanently connected reserve supply system must be provided for all MGPS including nitric oxide systems (excluding 700 kPa surgical air systems), for emergency use or to permit servicing or repair. 24 The reserve supply should be designed, when practicable, to provide the same flow rate as the primary system and have sufficient connected capacity to supply the pipeline for at least 4 hours.

3 The nominal and usable capacity of the cylinders commonly used on manifolds are given in Table 14 (the figures are the equivalents at standard temperature and pressure). Table 14 Capacities of medical gas cylinders used on manifolds Gas Nominal capacity (litres) at 137 bar g Oxygen J size Nitrous oxide J size G size Nitrous oxide/oxygen mixtures G size Medical air J size Oxygen/carbon dioxide mixture (5% CO2) J size Nitric oxide AU size Nitric oxide AK size * ** **Usable capacity (litres) 6,800 18,000 9,000 5,000 6,540 6,400 6,220 5,550 6,800 6,540 1,500* 4,000* – – 8,900 4,740 This may be subject to change.

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