Burnham Bottom Blowdown Tank User Manual
Bottom Blowdown Tank
• Eliminate precipitated solids from the bottom
of the boiler.
• Cools blowdown to 140°F or below before
dumping to drain by storing one entire
blowdown in a reservoir and using it to cool
the next blowdown.
• ASME Section VIII code-stamped tank.
• Sized either to accommodate one complete
boiler blowdown or to satisfy New Jersey
regulations.
• Model Range:
18" diameter x 24" height through
72" diameter x 92" height
• Modular conguration to meet customer
requirements includes: tank, legs, gauge glass
and pressure gauge.
• Can be custom congured to meet customer
requirements.
• Stainless steel striking plate standard.
• Openings to facilitate cleaning and inspection
standard.
• Safety valve and thermometer may be included
as options.
New Jersey Regulations for Blowdown Tanks
• Closed or Pressure Type—A Blowdown Tank
subjected to the maximum steam boiler
pressure must be constructed for such pressure
and stamped with either New Jersey, National
Board or ASME Standard.
• When the blowdown from any steam boiler
is disposed in a sewer or other interconnected
system, a Blowdown Tank must be placed
between the boiler and the sewer or system.
• The minimum metal thickness of Blowdown
Tanks, whether pressure or atmospheric, must
not be less than 5/16".
• Atmospheric or Vented Type—The outlet from
the Blowdown Tank shall be twice the area of
the boiler blowdown pipe and made to extend
internally within 6" from the bottom of the tank.
• A vent pipe, at least twice the diameter to the
inlet, shall lead to the outside atmosphere.
• Vents shall be as direct as possible to the outside
of the atmosphere and discharge at a point
not less than seven feet above the adjacent
walkway or areas without a valve or other
possible obstruction such as a water pocket.
• General—All Blowdown Tanks, whether of the
closed or vented type should be of the following
dimensions in relation to the boiler rating, and
must have approved openings for cleaning and
inspections (see reverse side).
Bottom Blowdown Tank
Boiler Pressure
PSIG Blow-o Line Pipe Size Vent Pipe Size Outlet Pipe Size Diameter of Tank Height of Tank
100
150
200
250
300
350
400
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
2-1/2"
3"
3-1/2"
4"
5"
6"
3"
3-1/2"
4"
5"
6"
8"
3"
4"
5"
6"
8"
8"
3-1/2"
4"
5"
6"
8"
10"
3-1/2"
5"
6"
8"
8"
10"
4"
5"
6"
8"
10"
10"
4"
5"
6"
8"
10"
10"
3"
3"
4"
5"
6"
6"
3"
3-1/2"
4"
5"
6"
8"
3"
4"
5"
6"
8"
8"
3"
4"
5"
6"
8"
10"
3-1/2"
5"
6"
8"
8"
10"
4"
5"
6"
8"
8"
10"
4"
5"
6"
8"
8"
10"
20"
24"
30"
42"
48"
54"
20"
24"
36"
42"
54"
60"
20"
30"
36"
42"
48"
60"
24"
30"
42"
48"
54"
60"
24"
30"
42"
48"
60"
66"
24"
30"
42"
48"
60"
72"
24"
30"
42"
48"
66"
72"
3'6"
4'0"
4'2"
4'0"
4'6"
6'0"
3'6"
5'0"
5'0"
5'0"
5'6"
6'0"
4'3"
4'6"
5'0"
6'0"
7'3"
7'0"
4'0"
4'6"
4'6"
5'0"
7'0"
7'2"
4'6"
5'6"
5'0"
5'6"
6'3"
7'8"
5'0"
5'6"
5'6"
6'2"
6'10"
7'0"
5'6"
6'0"
6'0"
6'4"
6'0"
8'0"
Boiler Rating
HP Cu. Ft. Minimum Size Tank Gallons
2 – 20 3.5 18" diameter x 24" 26.4
21 – 50 7.7 24" diameter x 30" 59
51 – 100 14.7 30" diameter x 36" 110
101 – 200 21.6 36" diameter x 36" 160
201 – 400 24.8 36" diameter x 42" 185
401 – 800 39.5 42" diameter x 48" 288
801 – 1000 63.0 48" diameter x 60" 470
©2012 Burnham Commercial
P.O. Box 3939 • Lancaster, PA 17604
Phone: 888.791.3790 • Fax: 717.293.5803
www.burnhamcommercial.com
Form No. PL81465601008-12/12-1Mc
Printed in the U.S.A.
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