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

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MIL-HDBK-1003/1

Add "SECTION 506 Sizing Hot Water Systems. Design in accordance with American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) Handbook - HVAC Applications-1999, Chapter 48, "Service Water Heating"; and in accordance with ASHRAE Standard 90.1, Energy Efficient Design of New Buildings Except Low-Rise Residential Buildings. For low-rise residential buildings, design in accordance with CABO Model Energy Code, (CABO Model Energy Code, was taken over by the International Code Council™). Size hot water system and set service water heater (SWH) storage temperature setpoint

for not less than 140 degrees Fahrenheit (F) to limit the

potential for growth of Legionella pneumophila. Provide a hot

water and cold water blending, tempering valve immediately

downstream of the SWH storage tank to provide anti-scalding

protection. Set the blending valve to deliver 110 degree F

water to the fixtures. Provide a balanced-pressure type

tempering valve."

Add "SECTION 506.1 Sizing Distributed or Residential SWH Systems. Use ASHRAE Chapter 48, Table 5 to size small SWH systems typical for family housing, Navy lodges, and bachelor housing units provided with individual SWH's. For family housing, select the SWH size from Table 5 based upon the number of bathrooms and bedrooms in the unit. For Navy lodges, use the 1 to 1.5 baths, 2 or 3-bedroom column, since entire navy families of 3 to 5 persons or more occupy these single rooms for extended stays of up to 30 days. For bachelor housing projects with individual SWH's for each unit or a pair of units, use the number of baths and bedrooms to select from Table 5."

Add "SECTION 506.2 Sizing Central SWH Systems. Use ASHRAE Chapter 48, Table 9 to size central SWH systems, except revise the numbers in row "9. Showers" by multiplying by the correction factor calculated in Section 506.4. The revision reflects Public Law 102-486 maximum fixture flow of 2.5

gallons per minute (gpm), ASHRAE recommended service water

storage temperature minimum of 140 degrees F, personnel safety

maximum fixture delivery temperature of 110 degrees F, and the

appropriate supply design cold water temperature, which varies

according to location and season.