PB Heat Gas/Oil Boilers manual Connect Fuel Piping, General, Install Fuel OIL Piping

CONNECT FUEL PIPING

7. CONNECT FUEL PIPING

A.GENERAL

1.Read the Burner Instruction Manual, supplied with the boiler or with the burner if purchased separately. Review applicable code requirements for burner and fuel piping installations.

2.Install piping to allow removal of burner and access to combustion chamber for cleaning or service.

B.INSTALL FUEL OIL PIPING

1.Place the fuel oil tank and install the piping in accordance with NFPA-31 and all other applicable codes.

2.General Guidelines for Oil Piping

a)Follow the guidelines in the Burner Manual for sizing oil lines. Never use smaller than 1/2" OD copper tubing.

b)Install manual shut-off valves on the suction line at the burner and at the oil line entrance to the building. If installing a shut-off valve on the return line, you must provide an oil pressure relief valve piped ahead of the shut-off valve and discharged to the tank to prevent over-pressure conditions.

c)Install a two-pipe oil distribution system when possible. It will improve the reliability of the oil delivery to the burner.

d)Use flare fittings when using copper tubing.

e)Provide an oil line filter in the suction line. Size the filter for the suction gear capacity of the burner oil pump if running a two-pipe system.

f)If burner is above the top of the fuel oil tank, install a check valve on the oil suction line at the burner to prevent oil from evacuating the line. If burner is below the top of the tank, install an anti-siphon device to prevent oil flow should the oil line break.

C.INSTALL GAS SUPPLY PIPING

1.Size the piping as required by the National Fuel Gas Code, ANSI Z223.1 or as required by local codes.

Figure 7.1: Gas Supply Connection to Boiler

4.Install a Service Valve, Sediment Trap and Ground Joint Union at the supply connection to the Gas Control Train as shown in Figure 7.1. These are not supplied with the boiler. Install them in accordance with local codes.

5.Use only pipe joint compounds rated for use with Liquefied Petroleum Gases.

D.TEST GAS SUPPLY PIPING

1.ISOLATE THE BOILER GAS CONTROL TRAIN FROM THE SYSTEM DURING TEST:

a)Test pressure 1/2 psig or less – Close the Manual Shut-Off Valve on the Boiler Gas Control Train.

b)Test pressure over 1/2 psig – Disconnect the gas supply piping upstream of the Boiler Manual Shut-Off Valve.

a)Use Table 7.1 for sizing of natural gas for a system pressure drop of 0.3 inch water column.

2.The standard gas train is designed for a maximum pressure of 1/2 psig (14 inches water column). Make sure the system regulator will not allow a higher pressure to the Gas Control Train under any conditions.

3.The minimum gas supply pressure is listed on the Burner Rating Plate. Make sure the system regulator and the piping are sized and adjusted properly to provide this pressure under all conditions.

WARNING

Do not expose the Gas Control Train to excessive pressure. The gas valves can be damaged. This could result in explosion hazard and severe personal injury or death.

Do not test gas supply piping with open flame. Use a soap suds mixture brushed onto the pipe joints to test for leaks.

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