1, provides NAVFACENGCOM criteria for designing, specifying, inspecting, and accepting plumbing systems for various naval shore facilities.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46

MIL-HDBK-1003/1

possibility of carbon monoxide poisoning within the occupied spaces. Ensure adequate clearances of inlet and outlet during snow, icing, flood, and heavy wind-driven rain conditions.

Add "SECTION 604.9.1 Water Velocities. Normally, provide water velocities not to exceed 10 feet per second (3.28 m/s). In hospitals and similar facilities, where a quiet system is desired, velocities are not to exceed 7 feet per second (2.13m/s)."

Add "SECTION 606.5.11 Sizing Booster Systems and Pumps. Water pressure may be increased by using a hydro-pneumatic system consisting of a tank, pumps, compressed air system, and associated control devices.

(a) Tank Pressure. The minimum pressure maintained within the tank is at low-water level and is equal to the pressure required to meet the fixture demands. The high pressure at high water level depends on the operating pressure differential selected for the system. A reasonable and most commonly selected pressure differential is 20 pounds per

square inch (138 kPa).

(b) Pumps. Pumps normally are provided in duplex. Each pump is sized to meet the requirements of the facility. Pump capacities in gallons per minute (liters per second) will be in accordance with Table 1. Pump head is to be equal to

the high pressure maintained within the hydro-pneumatic tank.

(c) Tank Capacity. Tank capacity is to be based upon a withdrawal, in gallons (liters), of 2-1/2 times the gallon per minute (liter per second) capacity of the pump and a low water level of not less than 10 percent of total tank capacity or 3 inches (76 mm) above top of the tank outlet,

whichever is greater. Table 2 indicates high water levels and withdrawals for efficient operation of tanks with bottom outlets and a 10-percent residual. Using this table, the tank capacity may be determined as per Example 1. Pressure ranges are given in pounds per square inch (psi) and kilopascals (kPa).