Fuel Supply Piping - Dunkirk EXCELSIOR EXB4075 Installation, Operation & Maintenance Manual

11.1 Installation of oil tank and piping shall conform
to requirements of authority having jurisdiction or in
absence of such requirements National Board of Fire
Underwriters . In addition, refer to NFPA 31 (U.S.) or
CSA B139 (Canada)
Installation of oil storage tank, vent, fill pipe and
caps shall conform to requirements of authority
having jurisdiction.
• In no case should vent pipe be smaller than 1¼" I.P.S.
• Fill pipe should not be less than 2" I.P.S.
• Suction line from tank to burner should be one
continuous piece of tubing to prevent air entering line
• Suction line, must be ⅜" O.D. copper tubing for runs of
50 feet or less, and ½" O.D. for longer runs.
• Use oil return line, same size as the suction line, on
installations where bottom of tank is below fuel unit of
burner.
• Bury oil lines or protect from mechanical injury.
• Flare fittings on all oil lines are required. Compression
fittings on suction line often allow air to be drawn into
fuel pump, making it difficult to maintain oil pressure at
nozzle.
• Do not run overhead fuel lines from tank to oil burner.
• Follow instructions, attached to fuel pump, for fuel pump
and by-pass connections.
• Install two stage fuel unit if tank is more than 20' from
boiler in place of single stage pump supplied as standard
equipment with burner. Verify rotation and speed are
identical and pump is suitable for burner horsepower
rating.
• Install oil line filter and shut-off valve in suction line.
• Install Shut-off valves in both suction and return lines at
burner for convenience in servicing burner.
• Allow extra tubing at burner so burner may be removed
from boiler for cleaning without disconnecting tubing.
See Figure 29 and 29.
• Use flexible oil lines so burner swing door can be opened
without disconnecting oil supply piping.
Figure 29 - Single Pipe Oil Line

11 - FUEL SUPPLY PIPING

Figure 30 - Double Pipe Oil Line
32
Table 5 - TWO STAGE UNITS,
TWO PIPE SYSTEMS (SEE FIGURE 15)
Maximum Length of Tubing "R"
LIFT
3/8" O.D.
"H"
Tubing (3 GPH)
0 93 FT.
2 85 FT.
4 77 FT.
6 69 FT.
8 60 FT.
10 52 FT.
12 44 FT.
14 36 FT.
16 27 FT.
18 ---
1/2" O.D.
Tubing (3 GPH)
100 FT.
100 FT.
100 FT.
100 FT.
100 FT.
100 FT.
100 FT.
100 FT.
100 FT.
76 FT.