Steam Boiler Indirect Water Heater Piping; Fuel Piping; Installation - Smith 88 Installation And Operation Instructions Manual

B. STEAM BOILER INDIRECT WATER
HEATER PIPING
1. See Figure 4.2 for typical installation.
2. Install Boiler Water Temperature Limit Control in 1"
Tee on supply connection (same side of boiler as low
water cut-off). Set Limit at 160°F to avoid steam
generation during periods when only the domestic
water is calling for heat.
3. Install circulator and strainer in supply piping. Install
check valve to prevent gravity circulation.
NOTICE
Maintain water level near normal water line to avoid
steam generation during periods when only the
domestic water is calling for heat.
Tank performance reduced when supplied by steam
boiler.

5. FUEL PIPING

A. INSTALLATION
1. Pipe gas to the boiler in accordance with local codes.
In the absence of local regulations refer to the
National Fuel Gas Code, ANSI Z223.1/NFPA 54.
2. Size and install the gas supply piping to provide a
supply of gas sufficient to meet the maximum demand
of all appliances without excessive pressure drop.
3. The rate of gas to be provided to the boiler can be
determined by:
CFH =
Obtain the gas heating value of the gas from the gas
supplier. As an alternative use Table 5.1.
4. Table 5.2 shows the maximum flow capacity of
several pipe sizes based on 0.3 inches of water
pressure drop. These values are based on a specific
gravity of 0.60. Apply the factors indicated in Table
5.3 for gas with specific gravity other than 0.60 to
obtain corrected capacities.
10
INSTALLATION AND OPERATING INSTRUCTIONS
Boiler Input (BTU/HR)
Gas Heating Value (BTU/FT³)
Figure 4.2: Typical Steam Boiler Indirect
Water Heater Piping
Table 5.1: Gas Input & Valve Inlet
1
Gas Input
Model
Nat. Gas
88 88.5
118 118.0
147 147.5
177 177.0
206 206.5
236 236.0
288 287.5
1. Natural Gas Based on 1000 Btu./Cubic Foot, LP Gas Based on 2500 Btu./Cubic Foot.
2. See instructions for sizing gas supply piping.
Table 5.2: Maximum Capacity of Pipe in CFH for a
Pressure Drop of 0.3" of Water
Based on Specific Gravity of 0.60
Pipe Length 1/2" 3/4"
(Feet) Pipe Pipe
10 132 278
20 92 190
30 73 152
40 63 130
50 56 115
60 50 105
Table 5.3: Maximum Capacity Correction Factors
Specific Gravity other than 0.60
Specific Gravity 0.50
Correction Factor 1.10
Specific Gravity 0.80
Correction Factor 0.87
Specific Gravity 1.30
Correction Factor 0.68
2
(CFH) Gas Valve Inlet (NPT)
LP Gas Nat. Gat LP Gas
35.4
47.2
"
1/2 1/2
59.0
70.8
82.6
94.4 "
3/4 3/4
115.0
1" 1-1/4" 1-1/2"
Pipe Pipe Pipe
520 1,050 1,600
350 730 1,100
285 590 890
245 500 760
215 440 670
195 400 610
0.55 0.60 0.65 0.70
1.04 1.00 0.96 0.93
0.85 0.90 1.00 1.10
0.84 0.82 0.78 0.74
1.40 1.50 1.60 1.70
0.66 0.63 0.61 0.59
"
"
0.75
0.90
1.20
0.71
1.80
0.58