MIL-HDBK-1191
Drain Size
Flow Rate*
L/s (GPM)
mm (inch)
100
( 4)
5.6
( 88)
150
( 6)
16.8
( 264)
200
( 8)
36.3
( 575)
250
(10)
66.3
(1050)
300
(12)
107.3
(1700)
* Flow rates for a floor drain with slotted cover and
3 mm (1/8 inch) drain pipe slope.
Water Treatment. A water chemistry analysis reporting, as a
9.2.4
minimum, the calcium and magnesium concentrations and the water hardness
shall be used as the basis for determining the potable water treatment
design scope. Water treatment equipment packages requiring regeneration
of media or components shall include multiple units as required to permit
routine maintenance. Water treatment technologies for the control of
water borne pathogens are discussed at 9.2.6 below.
Scale Control. Water softening will generally be required
9.2.4.1
when the water supply to the facility has a hardness of 170 mg/L (10
gr/gal) or more.
The softening system should be designed to deliver
water with a hardness between 50 mg/L (3 gr/gal) and 85 mg/L (5 gr/gal);
designer shall determine if any specialized equipment used in the MTF may
require more stringent requirements. Dental facilities' water hardness
shall not exceed 85 mg/L.
High Purity Water Systems. Water purification is the process
9.2.4.2
by which contaminants or impurities, which affect undesirably the
performance of specific equipment, or the outcome of medical and
laboratory tests, are removed from the water. Water purification systems
include reverse osmosis, deionization, ultrafiltration, and UV
sterilization. Type I and Type III reagent grade water, as specified in
ASTM D 1193 (reference 9g), are used in various applications such as for
medicine preparation processes in pharmacies, in distillation units, for
designated laboratory outlets, and in selected equipment for Renal
Dialysis, Glassware Washing, Central Sterile Supply, and other medical
and laboratory functions. Their use shall be coordinated with the Using
Agency and the Government Design Agent. The designer shall consider
local and central treatment options, and treatment system combinations,
best meeting the User's needs and overall life cycle cost. Refer to the
Heating, Ventilating, and Air Conditioning Section for make-up water
treatment design guidance for steam systems.
Legionella Control. The relative danger that legionellae
9.2.5
pose in any given MTF is a function of "system" factors which promote or
discourage colonization (as discussed below and in references 9d, 9e,
9f), of the relative vulnerability of the patient population, and even of
such factors as climate and ground water temperature. The presence of
aerosol generating sources such as showers and whirlpool baths increase
the risk of legionella infection. More seriously ill patients,
particularly those who are immunocompromised by medical condition or
treatment, are more vulnerable to legionella infection than the general
population. In addition to potential contamination danger from hot water
systems, cold water systems pose the risk of supporting legionella
colonization if the piping systems are subjected to heat sources. The
temperature of cold water systems may be elevated into ranges more
conducive to legionella colonization by ground temperatures, piping
9-5
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