OPUS

Medical Gases: Copper

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Medical gas piping systems in health care facilities are used for the distribution of gasses...
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Copper is a long lasting, corrosion resistant, lightweight and strong material that involves...
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Benefit of Material to Systems Application

Copper is a preferred, and in many cases required, material for medical gas applications. Copper is a long lasting, corrosion resistant, lightweight, strong, maintenance free material. Copper is available in standard lengths of up to 20 feet, with longer lengths available on request. Copper is effective in medical systems with basic operating  pressures varying from a 15” Mercury vacuum  to 160 psig Nitrogen delivery.

System Application and Material Usage

Safety standards for oxygen and other positive-pressure medical gases require the use OXY/MED copper tube (see ASTM B 819). Oxy/Med tube is available in standard Type K and L sizes but is treated and manufactured under strict guidelines and capped to ensure purity. These cleanliness requirements are called for because oxygen under pressure may cause the spontaneous combustion of some organic oils (the residual lubricating oil used during manufacture) and for the safety of patients receiving medical gases.

Care must be taken to prevent contamination of the system when the caps or plugs are removed and tube is installed.

Common delivery pressures for medical gas are as follows:
 50 psig........Oxygen
 50 psig........Nitrous Oxide
160 psig.......Nitrogen
 50 psig........Carbon Dioxide
 50 psig........Compressed Air, Medical and surgical
120 psig.......Compressed Air, High Pressure Instrument
 30 psig        Compressed Air, Laboratory
 90 psig........Compressed Air, Dental
15” Mercury...Vacuum Systems

Installation and Testing of Medical Gas Piping Systems:

The following requirements are based on those found in NFPA Standard No. 99, Health Care Facilities, Chapter 4, Gas and Vacuum Systems.

1. All piping, valves, fittings and other components for use in all non-flammable medical gas systems must be thoroughly cleaned by the manufacturer to remove oil, grease and other readily oxidizable materials as if they were being prepared for oxygen service. Use particular care in storage and handling. Such material must be capped or plugged to prevent recontamination before final assembly. Just prior to final assembly, the material must be examined internally for contamination.
      * Cleaning must be done in accordance with the provisions of CGA Pamphlet G-4.1, Cleaning Equipment for Oxygen Service.

2. All brazed joints in the piping shall be made up using brazing filler metals that bond with the base metals being brazed and that comply with Specification for Brazing Filler Metal, ANSI/AWS A5.8.
      * Copper-to-copper joints shall be made using a copper-phosphorus brazing filler metal (BCuP series) without flux.
      * Dissimilar metals such as copper and brass shall be joined using an appropriate flux with either a copper-phosphorus (BCuP series) or a silver (BAg series) brazing filler metal. Apply flux sparingly to the clean tube only and in a manner to avoid leaving any excess inside of completed joints. (NOTE: Ensure proper ventilation. Some BAg series filler metals contain cadmium, which, when heated during brazing, can produce toxic fumes.)
     * During brazing, the system shall be continuously purged with oil-free dry nitrogen to prevent the formation of scale within the tubing. The purge shall be maintained until the joint is cool to the touch.
     * The outside of all tubes, joints and fittings shall be cleaned by washing with hot water after assembly to remove any excess flux and provide for clear visual inspection of brazed connections.
     * A visual inspection of each brazed joint shall be made to assure that the alloy has flowed completely around the joint at the tube-fitting interface. Where flux has been used, assure that solidified flux residue has not formed a temporary seal that could hold test pressure.


3. Threaded joints in piping systems shall be tinned or made up with polytetrafluoroethylene (such as Teflon®) tape or other thread sealants suitable for oxygen services. Sealants shall be applied to the male threads only.

The above information was developed by the Copper Development Association. For more information visit the CDA Website.

Manufacturers and Suppliers Participating in OPUS

Elkhart Products Corporation

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Embassy Group LTD

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F.W. Webb Company

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Ferguson

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J.O. Galloup Company

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Metraflex Company

For over 55years Metraflex has met the needs of the contractor. The MetraLoop, a flexible pipe......
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Mueller Industries, Inc.

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NIBCO INC.

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Weldbend Corporation

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WinWholesale, Inc.

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Applicable Joining Methods

Flanged

Flanging maybe used for threaded or plane-end pipe. After a flange component is installed on the...
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Grooved

Grooved pipe joints consist of two grooved pipe ends (typically roll grooved) connected with a...
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Press

Press joining is a form of mechanical connection for copper and steel tubing which uses a...
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Solder

Soldering copper pipe, or “sweating” as it is called in the trades, joins the pipe...
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