Current through Register Vol. 56, No. 24, December 18, 2024
(a)
General requirements for chemical handling and chemical feed systems are as
follows:
1. Suitable means shall be provided
to ensure proper and continuous application rate of chemical.
2. Variation of the feed rate shall not
exceed five percent of the intended application rate.
3. Chemical solution feeders shall be located
so as to prevent dust and fumes from entering other operating areas in the
treatment plant.
4. Chemical
solution shall not be introduced directly into any pipe or conduit under
negative pressure or directly into a well.
5. An antisiphon device shall be installed on
the chemical solution feed line. The device shall include an antisiphon valve
to provide a vacuum break on the chemical solution feed line. The chemical feel
line shall be looped to a level higher than the highest elevation of the
chemical storage tank so as to prevent backsiphonage or drainage of the
chemical solution into the treated water supply.
6. Each chemical solution feeder shall be
equipped with a no-flow switch to prevent the feeding of chemical solution upon
cessation of water flow.
(b) Regulations for chemical solution tanks
are as follows:
1. When dissolving a solid
treatment chemical, each chemical solution tank shall be provided with adequate
agitation to keep the strength of the solution uniform.
2. Makeup water shall be introduced into the
chemical solution tank through an air break or other approved method, to
prevent back-siphonage.
3. Each
chemical solution tank shall be equipped with a cover to prevent contamination
and shall be of capacity sufficient to provide at least 24 hours worth of
storage at normal operating feed rates.
(c) Chemical feed lines shall be equipped
with clean-out connections, shall be easily accessible for repair or cleaning,
shall be protected against damage and freezing, shall be corrosion resistant,
shall be as short as possible, and shall be provided with adequate slope to
permit draining.
(d) Where
applicable, as determined by the administrative authority, safety equipment
such as a shower, a U.S. Bureau of Mines approved respirator, rubber or
neoprene gloves and apron, and goggles shall be provided.
