MIL-B-28686 1990 Edition, September 11, 1990
BOILERS, HOT WATER, WATERTUBE, (BENT TUBE, MULTI-DRUM AND CROSS DRUM) PACKAGED TYPE (320,001 TO 125,000 BTU/HR THERMAL OUTPUT CAPACITY)
Includes all amendments and changes through Cancellation Notice 1, June 30, 1998
Additional Comments: CNCL NO S/S
This specification covers watertube (bent drum, multi-drum and cross drum) packaged hot water generator units.
The hot water generator shall be one of the following types, sizes, and classes (see 6.2).
TYPES Type V - Hot water generator for low temperature water not exceeding 160 pounds per square inch gage pressure (psig) or 250 degrees Fahrenheit (°F). Type VI - Hot water generator for high temperature water exceeding 160 psig or 250°F. SIZES Size - 2 - Thermal output capacity between 320,001 and 10,000,000 British thermal units per hour (Btu/hr).
Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commanding Officer (Code 156), Naval Construction Battalion Center, Port Hueneme, CA 93043-5000, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.
Size - 3 - Thermal output capacity between 10,000,001 and 35,000,000 Btu/hr. Size - 4 - Thermal Output Capacity between 35,000,001 and 125,000,000 Btu/hr. CLASS Class 1 - Heavy oil fired Class 2 - Light oil fired Class 3 - Gas fired Class 4 - Combination heavy oil and gas fired Class 5 - Combination light oil and gas fired Class 6 - Coal fired Class 7 - Coal/oil fired Class 8 - Coal/gas fired Class 9 - Coal/oil/gas fired