PLUMBING AND MEDICAL GASES
General. This section provides design guidance for plumbing
and medical gas systems for Department of Defense (DOD) medical
treatment, training, and research facilities. The primary purpose of
these systems is to provide safe and reliable support to the medical
functional mission. In addition, appropriate design consideration shall
and adaptability to future facility modification or expansion. For
plumbing-related issues associated with fire protection systems, see the
Fire Protection Section of this document.
Supplemental Criteria and Standards. These criteria may be
supplemented by individual Military Departmental criteria, including
installation-specific requirements, as established by the Design Agent.
Plumbing Code (NSPC)(reference 9a) or the International Plumbing Code
(IPC) (reference 9b), the National Fire Protection Association Standards,
and the other documents listed as references.
Plumbing Systems. Plumbing systems include domestic cold and
hot water; sanitary, storm, and industrial (acid) waste drainage; water
treatment (such as softening, deionization, reverse osmosis); fuel gas;
and landscape irrigation. Plumbing systems shall be designed to be safe,
reliable and maintainable. Selection of materials, equipment, and
installation techniques shall consider life cycle cost effectiveness and
Designers are specifically alerted to provide for appropriate system
isolation and balancability, and necessary equipment and design practices
to avoid cross connections and backflow.
Criteria For Medical Gas Design in the Federal Republic of
Germany (FRG). Considerations of safety and practical constructability
require that medical gas systems design for facilities in the FRG be in
accordance with European Norm (EN) 737 Standards 1-4, and other EN and
Deutsche Industrie Normen (DIN) standards cited therein, supplemented
with the following requirements of this Military Handbook and NFPA 99:
- Pipe marking labels shall be color coded per EN standard,
with German language name of the gas or vacuum. In addition, a
label carrying the English language name of the gas shall be affixed
at the same location.
- Gas outlet and vacuum inlets shall have connections
geometrically specific to a single gas or vacuum, non-
interchangeable among other gases.
Outlet and inlet labels shall
be of a neutral color meeting EN requirements, consisting of a black
or white background with white or black lettering, respectively,
identifying the gas's chemical symbol. Additionally, colors on the
medical gas symbols will be in accordance with Table 4-220.127.116.11 of
NFPA 99 to assist in quickly identifying the appropriate outlet.
- Piping and source producer shall be sized to meet the
maximum demand identified by this Military Handbook or by NFPA 99,
at distribution pressures identified herein.
- Flux shall not be used in the brazing process.
- Continuous piping purge with oil-free nitrogen gas shall
be required during brazing.