15 August 2002
Check valves in discharge line from each main pump.
Miscellaneous valves for operation of secondary functional pumps.
Double Valve Protection. Drydocks must be protected from sources of
potential flooding, such as flooding inlets, from an adjacent dock through dewatering
systems or backflow through pumps, by two methods of protection. Combinations of
valves, sluice gates and stoplogs may be used.
Motor Controls and Recording Devices. Mount these devices on a
single control panel at or near the motor room.
Toilet. Provide at least one water closet near the motor room.
Heating and Ventilating
to MIL-HDBK-1003/3 Heating,
Ventilating, Air Conditioning, and Dehumidifying Systems for heating and ventilating
criteria for pumping stations.
Pump Discharge Tunnel. Design the pump discharge tunnel in the form
of a variable section header, or header tunnel, connecting the various pump discharge
lines to carry water into the discharge tunnel outer portions. Separate the pump
discharge tunnel from the flooding system.
Auxiliaries. Install gate valves and check valves in all pump discharge
lines, except in unusual cases where discharge is above high water.
Discharge Stop Log. Provide a stop log or hinged stoplog in the
discharge tunnel to allow inspection and maintenance of discharge valves.
Gratings. Gratings must have small openings to prevent small tools and
other objects from going through the pumps. During work around a docked vessel,
some dock floor drainage grates may be temporarily removed. As an added precaution
to prevent damage to the pumps, it may be advisable to place a grating over pump
suction boots or bells.
Salt Water Intake Screen. Where salt water is to be pumped for fire
protection or other purposes, provide a screen at the intake to catch solids of sizes that
would interfere with pump operation. If large quantities of salt water are to be handled,
moving mechanical screens may be required. Refer to MIL-HDBK-1005/7 Water Supply
Systems for screen design.
High Water Sensing Systems. Provide two independent water level
sensing systems. The primary sensing system, which must operate from station power,
shall be designed to activate both the pumps and the alarm. A backup or secondary
sensing system must have an independent power source and operate the alarm only.
Both systems must announce locally and at a central location that is continuously