TM 5-810-15
Table 7-7. Blowdown Tank Size. (Continued).
Cold
Boiler
Steam
Water
Water
**Blowdown
Design
*Blowdown
Vent
inlet
Outlet
Tank
Pressure
Size
Size
Size
Size
Size
(psig)
(inches)
(Inches)
(Inches)
(inches)
(Dia x Ht.)
20" x 6*0"
4
1
2
27" x 6*6"
1
5
1
3
39" x 6*6"
401
1
8
2
4
48" x 6*6"
to
1
8
2
4
60" x 7*0"
500
2
10
3
5
72" x 7*0"
2
12
4
8
24" x 6*0"
5
1
2
30" x 6*6"
1
6
1
3
42" x 6*6"
501
1
8
2
4
54" x 7*0"
to
1
10
2
5
66" x 7*0"
600
2
12
3
6
72" x 7*0"
2
12
4
8
27" x 6*6"
5
1
2
36" x 6*6"
1
6
1
3
48" x 6*6"
601
1
8
2
4
60" x 7*0"
to
1
10
2
5
72" x 7*0"
800
2
12
3
6
72" x 7*0"
2
12
4
8
30" x 6*6"
6
1
2
42" x 6*6"
1
8
1
3
54" x 7*0"
801
1
10
2
4
66" x 7*0"
to
1
10
3
5
72" x 7*0"
1000
2
12
4
6
36" x 6*6"
8
1
2
48" x 6*6"
1001
1
8
2
4
66" x 7*0"
to
1
10
2
4
72" x 7*0"
1500
1
12
3
5
42" x 6*6"
8
1
2
48" x 6*6"
1505
1
10
1
4
66" x 7*0"
to
1
10
2
5
72" x 7*0"
2000
1
12
3
5
48" x 6*6"
8
1
4
66" x 7*0"
2001
1
10
2
4
72" x 7*0"
to
1
12
2
5
72" x 7*0"
2500
1
12
3
6
*Size of blow-off connection on boiler or size of blow-off header, whichever is larger.
**The sizes tabulated are based on the minimum diameter and minimum volume that can be used. Larger diameter tanks with
equivalent or larger volume may be used.
(2) The pressure for which the tank should
temperature should not exceed 140 degrees F. The
be designed is shown in table 7-8. The blowdown
pressure of the blowdown leaving any type of
tank will have a wear plate between the tank water
blowdown equipment will not exceed 5 psig. The
level and the top of the tank. The blowdown will
Boiler Law and Rules & Regulations Code admin-
enter tangentially and the wear plate attached to the
istered by the Bureau of Safety & Regulation in
shell at the point of impact from the blowdown.
Lansing, Michigan can be used as a guide in
The wear plate will be the same thickness of the
designing blowdown tanks. Each state will be
tank and extend approximately one-third of the
consulted to determine their design criteria.
tank circumference. The blowdown tank vent will
allow steam to escape from the highest possible
7-9. Slowdown heat recovery.
location on the tank and will be as direct as
a. Application. A LCCA will be conducted to
possible to the outside atmosphere without
determine if a blowdown heat recovery system is a
intervening stop valves. The water discharge
justifiable capital investment.
7-10
Previous Page
