Model 4
1500 - 6000 MBTU/hr
Rev. 03-08
Section B2-8
these boilers, the requirements are the same as for A.S.M.E CSD-1 requirements.
Above 12.0 MMBtu/hr input, the requirements defer to the NFPA 85 standards for
single burner boilers.
C. A.S.M.E. CSD-1 -
Recommended guidelines as described by this Code pertain to
boilers rated at 400,000 Btu/hr input to 12.0 MMBtu/hr input. Above 12.0
MMBtu/hr input, the requirements defer to the NFPA 85 standards for single burner
boilers. For the sizes this Code covers, the requirements are as follows, in addition
to the standard UL package:
• Low
Oil
Pressure Switch for oil firing
• ¾" Pressure Control Piping
• If
gas supply is > 5 psig, a relief valve is required after the gas pressure regulator in
the main and pilot gas trains.
• Lever Handled shutoff cock for the pilot gas train.
• Non-fused disconnect to remove boiler from all sources of power.
DIMENSIONS AND RATINGS
For layout purposes, the nominal dimensions and connections for the Model 4
Standard Package Boiler are shown in Figure B2-1 and Table B2-2. Ratings of each
boiler size are noted in Table B2-3. Additional information is shown in the following
figures, tables, and illustrations.
Table B2-4: Recommended steam nozzle sizes for high pressure boilers operating at
lower and higher pressures.
Figure B2-2: Standard gas train dimensions and components.
Table B2-5: Natural Gas Pressure Requirements, standard gas train size.
Table B2-6: Natural Gas Pressure Requirements, oversized gas train.
Table B2-7: Propane Gas Pressure Requirements, standard gas train size.
Table B2-8: Propane Gas Pressure Requirements, oversized gas train.
Table B2-9: Safety Valve Outlet Sizes.
