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Danger, Caution, What to do if you smell gas – Dunkirk DXL Series User Manual

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10 - CONNECTING GAS SERVICE

General

• Use piping materials and joining methods acceptable

to authority having jurisdiction. In absence of such

requirements of National Fuel gas Code, ANSI Z223.1/

NFPA 54

• Size and install gas piping system to provide suffi cient

gas supply to meet maximum input at not less than

minimum supply pressure. See Table 5 .

• Support piping with hooks straps, bands, brackets,

hangers, or building structure components to prevent or

dampen excessive vibrations and prevent strain on gas

connection. Boiler will not support piping weight.

• Use thread (joint) compound (pipe dope) suitable for

liquefi ed petroleum gas.

• Install fi eld sourced manual main shutoff valve, ground

joint union, and sediment trap upstream of gas valve.

See Figure 13 .

DANGER

Fire Hazard. Do not use matches, candles, open

fl ames, or other methods providing ignition source.

Failure to comply will result in death or serious

injury.

!

Leak Check Gas Piping
Pressure test boiler and gas connection before placing

boiler in operation.

• Pressure test over 1/2 psig (3.5 kPa). Disconnect

boiler and its individual gas shutoff valve from gas

supply system.

• Pressure test at 1/2 psig (3.5 kPa) or less. Isolate

boiler from gas supply system by closing manual gas

shutoff valve.

• Locate leakage using gas detector, noncorrosive

detection fl uid, or other leak detection method

acceptable to authority having jurisdiction. Do not

use matches, candles, open fl ames, or other methods

providing ignition source.

• Correct leaks immediately and retest.

Figure 13 - Gas Piping

CAUTION

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.
• Do not touch any electrical switch; do not use

any phone in your building.

• Immediately call your gas supplier from a

neighbor’s phone. Follow gas supplier’s

instructions.

• If you cannot reach your gas supplier, call the fi re

department.

!

!

MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS/HOUR

(Gas Pressure = 0.5 psig or less, Pressure Drop = 5 in. w/c)

Table 4 - Pipe Sizes

Length of

Pipe (Feet)

Nominal Iron Pipe Size

½”

¾”

1”

1¼”

10

175

360

680

1400

20

120

250

465

950

30

97

200

375

770

40

82

170

320

660

60

66

138

260

530

80

57

118

220

460

100

50

103

195

400

For additional information refer to the National Fuel Gas

Code Handbook.

Table 5 - Gas Pressure

Natural Gas

Propane

Min. Supply Pressure

5" w.c.

11" w.c.

Max. Supply Pressure

13.5" w.c.

13.5" w.c.

Manifold Pressure

3.5" w.c.

10.5" w.c.