2-13. OPERATING PROCEDURES.
General. The primary function of the TWDS is to distribute water over a long distance to
large water storage facilities such as the 300,000 and 800,000 Water Storage and
Distribution Systems. Two storage and distribution kits, having a combined storage
capacity of 40,000 gallons, are supplied with the TWDS and serve as auxiliary water
distribution points. The TWDS has two primary modes of operation, fill and discharge. In
the fill mode, water is drawn from the water source and pumped to the system and kits
During discharge, water is removed from the 20K tanks in the storage kits and pumped to
consumers through the distribution points. The TWDS can operate in both fill and
discharge modes at the same time.
Fill Hoseline (Packing). Refer to figure 2-30. Before system startup, the hoseline must be filled with
water to ensure priming of 600 gpm pumps and prevent damageto hoses from high winds. Filling
(packing) of the hoseline is required when starting the system for the first time and after replacing or
repairing a segment of the hoseline.
The water source must be tested and must meet water quality standards established by the
office of the surgeon general
Before packing hoseline, ensure that the product water meets the chlorine residual standard
set by the office of the surgeon general. It is recommended that the chlorine residual of the
water used to initially pack the line should be raised at least 5ppm over the standard set by
the surgeon general to ensure proper disaffection of the TWDS. After the lines are packed,
chlorine residual must be adjusted accordingly.
To prevent damage to the pumping stations, ensure sufficient water is available for packing the
hoseline. Approximately 8,000 gallons are required to pack 1-mile of hoseline.
(1) Disconnect last hoseline segment from downline water and distribution system. End of hoseline must
remain open to allow initial flushing of sediment and contaminants from hoses.
Hoseline may be filled during system installation, as each boost pump is installed and brought on
line, to reduce assembly and startup time and prevent damage to hoseline in the event of high
(2) Open suction valve L1 and discharge valve L2 at lead pumping station.
(3) Open suction valves B2 and discharge valves B3 at all boost pumping stations.