GAS PIPING

4. GAS PIPING

A . GENERAL

1.All fuel piping to the boiler is to be 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 piping to provide a supply of gas sufficient to meet the maximum demand of all appliances supplied by the piping.

B.FUEL LINE SIZING

1.The rate of gas to be provided to the boiler can be determined by the following:

Input Rate (ft³/hr) =

Boiler Input Rate

(Btu/hr)

Gas Heating Value

(Btu/ft³)

 

Obtain the gas heating value from the gas supplier.

2.As an alternative use Table 4.1 which uses typical heating values for natural gas and liquefied petroleum (LP) gas.

Table 4.1: Gas Input Rates

Boiler

Gas Input Rate* (ft³/hr)

Natural Gas

LP Gas

Model

PI-T50

50

20

PI-T80

80

32

PI-80

80

32

 

 

 

PI-140

140

56

 

 

 

PI-199

199

79

 

 

 

*Natural gas input rates are based on 1000 Btu/ft³, LP input rates are based on 2500 Btu/ft³.

3.Table 4.2 shows the maximum flow capacity of several pipe sizes based on 0.3" of pressure drop.

a.The values shown are based on a gas specific gravity of 0.60 (Typical for natural gas).

b.Multiply the capacities listed by the factors indicated in Table 5.3 for gas with a specific gravity other than 0.60 to obtain the corrected capacity.

Table 4.2: Maximum Capacity of Pipe (CFH) for a Pressure Drop of 0.3" of Water

Pipe

 

 

1-1/4"

1-1/2"

Length

3/4" NPT

1" NPT

NPT

NPT

(Feet)

Pipe

Pipe

Pipe

Pipe

10

278

520

1,050

1,600

20

190

350

730

1,100

30

152

285

590

890

 

 

 

 

 

40

130

245

500

760

50

115

215

440

670

60

105

195

400

610

 

 

 

 

 

The values are based on a specific gravity of 0.60 (typical for natural gas). See Table 4.3 for capacity correction factors for gases with other specific gravities.

Table 4.3: Maximum Capacity Correction Factors for Specific Gravity other than 0.60

Specific

0.50

0.55

0.60

0.65

0.70

0.75

Gravity

 

 

 

 

 

 

Correction

1.10

1.04

1.00

0.96

0.93

0.90

Factor

 

 

 

 

 

 

 

 

 

 

 

 

 

Specific

0.80

0.85

0.90

1.00

1.10

1.20

Gravity

 

 

 

 

 

 

Correction

0.87

0.84

0.82

0.78

0.74

0.71

Factor

 

 

 

 

 

 

 

 

 

 

 

 

 

Specific

1.30

1.40

1.50

1.60

1.70

1.80

Gravity

 

 

 

 

 

 

Correction

0.68

0.66

0.63

0.61

0.59

0.58

Factor

 

 

 

 

 

 

 

 

 

 

 

 

 

4.The gas piping to the boiler must be a minimum of 3/4" pipe. The boiler is supplied with a 3/4" NPT x 1/2" NPT bell reducer. Do not remove the reducer.

5.Size and install the gas supply piping for no more than 0.5 inches of water pressure drop between the gas regulator and the boiler.

C.GAS SUPPLY PIPING INSTALLATION

1.Do not install any piping directly over or in front of the boiler. Locate the drop pipe adjacent to the boiler.

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PB Heat Gas Boiler manual GAS Piping, Fuel Line Sizing, GAS Supply Piping Installation, Feet Pipe
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Gas Boiler specifications

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