1 February 1999
approximately 14 kPa (2 psi), the hydrostatic head on the feed pumps should be approximately
3 meters (10 feet). Where the boiler feed operates at temperatures above100 degrees C (212
degrees F), increase the hydrostatic head in proportion to the increase in the vapor pressure of
the liquid. Provide a bypass and isolation valves for each feedwater heater to permit operation
of the boilers at times when the heater is being serviced.
c. Combustion Equipment. The installation of combustion equipment, including burners
and draft fans, will be in accordance with ASHRAE Handbooks, Underwriters Laboratory (UL),
National Fire Protection Association (NFPA), and the recommendations of equipment
(1) Gas Burners. All gas-fired equipment will be equipped with a burner, which can be
readily converted to burn an alternate fuel, as required in AR 420-49. Specify gas equipment for
(2) Oil Burners. The selection of oil burners will depend on the grade of the oil being
burned, the size of installation, and the need for modulating control. For light oil, atomizing will
be accomplished using oil pressure, air, or steam atomizing burners. For heavy oil, atomizing
will be accomplished using air or steam atomizing burners.
(3) Stacks and Draft Requirements. Heating installations will include either natural-
draft chimneys or individual boiler ventilation fans with stub stacks. Where natural-draft stacks
would be a hazard to aircraft or otherwise objectionable, use mechanical-draft fans discharging
into short stub stacks.
f. Fuel Selection and System Design. Fuel selection and system design will be in
accordance with the AEI, ASHRAE Handbooks, NFPA Standards, Military Handbook 1008, and
g. Auxiliaries. Where required, request for standby electric generators will be in
accordance with paragraph 1-5. Boiler plant auxiliaries should, in general, be electrically driven;
however, whenever an uninterrupted supply of steam is essential, provide one of the boilers
with steam-driven auxiliaries. Provide individual forced and/or induced-draft fans with each
boiler unit. Provide necessary standby equipment to maintain essential operations.
h. Flow Measurement.
(1) Provide gas and oil meters for the boiler installation. Provide a gas meter at each
building. Install oil meters in both the supply line and the return line of each storage tank.
(2) Meter all building steam supply, hot water supply, condensate return, and hot water