Model FPS Fire Tube Steam Boiler 
Specification

Note:  items shown in parenthesis () are options.

1. General

Furnish and install as shown on the plans ____ one (1) Precision model FPS____-_____ forced draft, gas fired vertical firetube boiler rated at _____ boiler horsepower. Boiler shall be designed for a maximum allowable working pressure of (15psi) (150psi) and shall deliver _____lb/hr (F&A 212^º F) of steam at ____ psi (up to 135 psi) operating pressure.  Boiler shall be completely factory assembled and tested, with controls and trim as specified below.  Complete package shall be UL Listed and shall carry the Underwriters Laboratories Listing Mark.  Units rated at 9.5 boiler horsepower and over shall also comply with ASME CSD-1.  Boiler shall be designated for _____V, _______PH, _______HZ electrical supply with single power connection.

2. Pressure Vessel

Vessel shall be constructed and stamped in accordance with ASME Section IV (15 psi) or Section I (150 psi) and shall be registered with the National Board.  Shell and tubesheets shall be fabricated from carbon steel.  Tubes shall be 2” OD x 0.105 wall SA178A ERW tubing.  Vessel shall be stress relieved (units > 15psi design) and equipped with inspection openings as required by ASME Code.

3. Combustion Chamber

Combustion chamber shall be fabricated from steel plate, lined with ceramic fiber blanket.  Combustion chamber wall and bottom shall be of monolithic construction, formed from high temperature refractory, not less than 4” thick.

4. Burner

Provide forced-draft, flame retention head burner to burn natural (LP) gas with on-off (low-high-low or full modulation) firing rate control.  Burner shall be equipped to fire at a maximum input of _____Btu/hr at an elevation of _____ ft.  Blower motor shall be 3450 rpm design with motor starter (units over ¾ hp).  Burner controls shall conform to UL795 (and CSD-1, FM, IRI codes).  For electrical supplies other than 120V, the burner shall be equipped with a control circuit transformer.

5. Boiler Controls

Boiler shall be provided with the following controls:

• Properly sized ASME safety valve(s) set at _____psig, manual drain valve and pressure gauge with gauge cock.

• Operating control and manual reset high limit control with siphon manifold; high-low modulating control (where appropriate)

• Automatic reset, float type primary water level control with water level gauge glass and manual blowdown valve; probe type auxiliary water level control with manual reset with pilot light.

• Slow opening and quick opening bottom blowdown valves (units > 100 psi).

6.  Packaging

Complete package shall be factory assembled and mounted on structural channel support skid.  All specified components are to be mounted, piped and wired.  Boiler shall be insulated with a minimum of 4 inches of ¾ pound density fiberglass and housed in a rectangular, 16 gauge enamel painted steel jacket.  Jacket temperatures shall not exceed 130^º F during continued operation at high fire.  Lifting lugs shall be provided to allow rigging of package during installation.

7.  Quality Control

Complete packaged boiler shall be manufactured by Precision Boilers in strict accordance with ASME Boiler and Pressure Vessel Code in an ISO 9002 quality system.

Specifications subject to change without notice.