MIL-HDBK-1005/9A
(1) Volumetric feeders, accuracy of 3 percent.
(2) Gravimetric feeders, accuracy of 1 percent.
Gravimetric feeders are more expensive than volumetric feeders.
4.7.2.5
Safety Precautions.
Provide the following safety
factors as a minimum:
a)
First aid kits.
b) Continuous toxic gas monitors with alarms and
pressure demand self-contained breathing apparatus (SCBA) for
emergency gas situations.
c) A readily accessible potable water supply to wash
away chemical spills. Locate emergency shower and eyewash
facilities where they are easily accessible to those in need.
d) Special handling clothing and accessories, such as
gloves, goggles, aprons, and dust masks.
e) Adequate ventilation as determined by the medical
activity industrial hygienist.
f) No electrical convenience outlets in activated
carbon storage or feeding rooms. Store activated carbon in a
separate room with adequate fire protection.
g) Entry into confined spaces will require adherence
to a gas-free engineering program.
4.7.2.6
Chemical Feeder Capacity and Standby Requirements.
Base feeder capacity on maximum expected instantaneous flow and
dosage. Essential (noninterruptible) chemical feeders such as
disinfection units must have a standby unit having capacity
equal to the largest unit. The need for standby units on other
treatment processes depends on raw water quality and the
specific treatment scheme. Where two chemical feed systems
could use the same spare chemical feeder, one standby unit to
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