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63.4.5.1
Bulk cryogenic fluid systems in medical gas applications at health care facilities shall be in accordance with Section 63.4, 63.1.1.4(3), and the material-specific requirements of Chapter 9 of NFPA 55 as applicable. [55:8.5.1]
63.4.5.1.1
Bulk cryogenic fluid systems shall be in accordance with the following provisions as applicable:
  1. Where located in a court, systems shall be in accordance with 63.4.13.2.7.2.
  2. Where located indoors, systems shall be in accordance with 63.4.14.11.1.
  3. Systems shall be installed by personnel qualified in accordance with CGA M-1, Guide for Medical Gas Installations at Consumer Sites, or ASSE 6015, Professional Qualification Standard for Bulk Medical Gas Systems Installers.
  4. Systems shall be installed in compliance with Food and Drug Administration Current Good Manufacturing Practices as found in 21 CFR 210 and 21 CFR 211.
[55:8.5.1.1]
63.4.5.1.2
The following components of the bulk system shall be accessible and visible to delivery personnel during filling operations:
  1. Fill connection
  2. Top and bottom fill valves
  3. Hose purge valve
  4. Vent valve
  5. Full trycock valve
  6. Liquid level gauge
  7. Tank pressure gauge
[55:8.5.1.2]
63.4.5.1.3
Bulk cryogenic fluid systems shall be anchored with foundations in accordance with the provisions of CGA M-1, Guide for Medical Gas Installations at Consumer Sites. [55:8.5.1.3]
63.4.5.1.4
Bulk cryogenic fluid systems shall consist of the following:
  1. One or more main supply vessel(s), whose capacity shall be determined after consideration of the customer usage requirements, delivery schedules, proximity of the facility to alternative supplies, and the emergency plan
  2. A contents gauge on each of the main vessel(s)
  3. A reserve supply sized for greater than an average day's supply, with the size of vessel or number of cylinders being determined after consideration of delivery schedules, proximity of the facility to alternative supplies, and the facility's emergency plan
  4. At least two main vessel relief valves and rupture discs installed downstream of a three-way (three-port) valve
  5. A check valve located in the primary supply piping upstream of the intersection with a secondary supply or reserve supply
[55:8.5.1.4]
63.4.5.1.5
Bulk cryogenic fluid reserve supply systems consisting of either a second cryogenic fluid source or a compressed gas source shall include the following:
  1. When the reserve source is a compressed gas source, the reserve shall be equipped with the following:
    1. A cylinder manifold having not less than three gas cylinder connections or as otherwise required for an average of one day's gas supply
    2. A pressure switch to monitor the pressure in the cylinder manifold
  2. When the reserve source is a second cryogenic fluid vessel, the reserve tank shall be equipped with the following:
    1. An actuating switch or sensor to monitor the internal tank pressure
    2. A contents gauge to monitor the liquid level
  3. When the reserve source is either a cryogenic fluid or compressed gas source, a check valve shall be provided to prevent backflow into the reserve system
[55:8.5.1.5]
63.4.5.1.6
Bulk cryogenic fluid systems shall include a fill mechanism consisting of the following components:
  1. A nonremovable product-specific fill connection in compliance with CGA V-6, Standard Cryogenic Liquid Transfer Connection
  2. A means to cap and secure the fill connection inlet
  3. A check valve to prevent product backflow from the fill inlet
  4. A fill hose purge valve
  5. Supports that hold the fill piping off the ground
  6. A secure connection between the bulk tank and the fill piping
  7. Supports as necessary to hold the fill line in position during all operations associated with the filling procedure
[55:8.5.1.6]
63.4.5.1.7
Where vaporizers are required to convert cryogenic liquid to the gaseous state, the vaporizer units shall conform to the following:
  1. Be permitted to operate by either ambient heat transfer or external thermal source (e.g., electric heater, hot water, steam)
  2. Be designed to provide capacity for the customer's peak and average flow rates under local conditions, seasonal conditions for weather and humidity, and structures that obstruct air circulation flow and sunlight
  3. If switching is required as part of the system design, have piping and manual/automatic valving configured in such a manner that operating vaporizer(s) or sections of the vaporizer can be switched to nonoperating vaporizer or section of the vaporizer to de-ice through a valving configuration that ensures continuous flow to the facility through either or both vaporizers and/or sections of the vaporizer if valving switchover fails
[55:8.5.1.7]
63.4.5.1.8
Where a vaporizer requires an external thermal source, the flow from the source of supply shall be unaffected by the loss of the external thermal source through either of the following:
  1. Reserve ambient heat transfer vaporizers capable of providing capacity for at least one day's average supply and piped so as to be unaffected by flow stoppage through the main vaporizer
  2. A reserve noncryogenic source capable of providing at least one day's average supply
[55:8.5.1.8]

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