Model 4
1500 - 6000 MBTU/hr
Rev. 03-08
Section B2-29
E.
The maximum sound level shall not exceed 80 dBA measured 3 feet
in front of the boiler.
2.3
PRODUCT DESIGN
A.
Pressure Vessel
1.
The upper drum shall have a 20" OD, manufactured from SA–
53 Gr. B seamless pipe, with a minimum wall thickness of
0.375".
2.
The lower drum shall have an 8–5/8" OD, manufactured from
SA–53 Gr. B seamless pipe, with a minimum wall thickness of
0.322".
3.
The generating tubes shall be 2" OD, manufactured from SA–
178 Gr. A tubing, with a minimum wall thickness of 0.095".
4.
The boiler shall have two downcomers, located at the rear of
the boiler, and be totally insulated from the generating tubes.
These shall be a minimum of 2–1/2" OD, manufactured from
SA–178 Gr. A tubing, with a minimum wall thickness of .105".
5.
The upper drum shall have an inspection opening, located at
the rear of the unit, to allow internal inspection, and shall be a
minimum of 4"x6".
6.
The lower drum shall have inspection openings, located at the
front and rear of the unit, to allow internal inspection, and shall
be a minimum of 4-7/8" x 5-7/8".
7.
The boiler shall have inspection openings in the convection
area.
8.
A feedwater tapping and integral feedwater distribution pipe
shall be located in the upper drum. The distribution pipe shall
blend the feedwater with the boiler water.
9.
A 3/4" surface blowoff connection shall be located in the rear
head of the upper drum.
10. A
" bottom blowoff connection shall be located in the
lower drum.
B.
Refractory
1.
Refractory shall be limited to the furnace floor to insulate the
lower drum, and to the burner throat tile.
2.
High temperature insulation shall be installed on the front wall
of the furnace.
C. Insulation and Casing
1.
The boiler insulation shall be a minimum of 2" fiberglass, and
shall cover the entire pressure vessel.
2.
The insulation shall be covered with a corrugated metal
lagging.
3.
The metal lagging and insulation shall be arranged for easy
removal and installation if required.
4.
The front head (windbox) shall be attached with a davit arm,
gasket sealed, and bolted. The front head shall swing open to
provide full access to the furnace chamber and burner throat
tile.
