6
NOTES:
1. All piping is schedule 40.
2. Pipe sizes listed are based on a 20°F
or
40°F differential
(temperature drop). Select one to match application.
Consult factory if boilers are used in low temperature
applications or blending/mixing devices.
3. When specified return piping size is less than 3”, install
3” X 12” nipple and appropriate size bell reducer directly
into boiler return tapping as shown.
4. Drain valve — ball valve preferable, gate valve acceptable
alternative (supplied by others).
- Minimum valve size per ASME code is 3/4” NPT
5. For multiple water boiler piping, consult factory.
WATeR BOILeR pIpInG
To be used when system return water is not less
than 135° F for prolonged periods of time and system flow
does not impact flow through the boiler
MODeL
SUppLy pIpInG SIZe
(In.) (1)
ReTURn pIpInG SIZe (In.)
ReTURn (2)
ReTURn
HeADeR (2A)
ReTURn BRAnCH
(QTy.) SIZe (2B)
20¡F D ROp
40¡F D ROp
20¡F
DROp
40¡F
DROp
20¡F D ROp
20¡F
DROp
V903A
V904A
V905A
V906A
V907A
V908A
V909A
V910A
V911A
V912A
2
2
2
2-1/2
2-1/2
2-1/2
3
3
3
4
1-1/2
1-1/2
1-1/2
1-1/2
2
2
2
2-1/2
2-1/2
2-1/2
2
2
2
2-1/2
2-1/2
2-1/2
3
3
3
4
1-1/2
1-1/2
1-1/2
1-1/2
2
2
2
2-1/2
2-1/2
2-1/2
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
3
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
(2) 3
STeAM BOILeR pIpInG
nOTeS:
1. All piping is schedule 40.
2. To prevent condensate from being trapped in header, do not reduce
equalizer elbow at header connection.
3. Drain/blowoff valve — ball valve preferable, gate valve acceptable
alternative (supplied by others).
– Minimum valve size per ASME code is 3/4” NPT 903A/905A;
1” NPT 906A/910A; 1-1/4” NPT 911A/912A.
Ð Increasing the valve size will improve the blowdown operation.
Ð In all cases, piping connection blowoff valve to boiler should be
full size to the point of discharge.
4. For pumped return systems, see V9A installation manual.
5. For multiple steam boiler piping, consult factory.
MODeL
pIpInG SIZe (In InCHeS)
RISeR SpACInG
(InCHeS)
RISeR
(Qty.) SIZe (1)
HeADeR &
SUppLy (2)
ReTURn
(3)
eQUALIZeR
(4)
'A'
'B'
V903A
V904A
V905A
V906A
V907A
V908A
V909A
V910A
V911A
V912A
(1) 3
(1) 4
(1) 4
(1) 4
(2) 4
(2) 4
(2) 4
(2) 4
(2) 4
(3) 4
3
4
4
4
6
6
6
6
6
6
1-1/2
2
2
2-1/2
2-1/2
2-1/2
2-1/2
3
3
3
2
2
2
2-1/2
2-1/2
2-1/2
2-1/2
3
3
3
Ñ
Ñ
Ñ
Ñ
36
42
48
54
60
30
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
36
V9 Series Piping Recommendations
Water and Steam
