Capacity | HiRAM ®
LIGHTING AND FLAME SUPERVISION
INSTALLATION AND OPERATION
A gas pilot or direct spark igniter can be used to light 4575 HiRAM® burners when the main air is set to a low fire rate.
HiRAM®s are suitable for furnace temperatures up to 2400°F. They can be used with preheated air up to 600°F. The reduced tile discharge opening also protects burner internals from radiant heat and from melting furnace splash. Standard burners include 3000°F dense castable tiles. Burner tile installation should be made in accord with instructions on Supplement DF-M1 for hard refractory lined furnaces or DF- M2 for fiber lined furnaces. It is generally not necessary to use a metal jacketed tile in fiber lined furnaces with 4575 burners. The HiRAM® burners can be used with a variety of control systems including pressure-balanced or electronic fuel/air ratio systems. The gas pressure requirement is approximately 0.7 that of the combustion air when firing on stoichiometric ratio. System pressure drops should be checked to make sure that adequate gas pressure will be available at the burner. In order to avoid any potential combustion driven oscillations which can produce excessive noise or vibration, it is imperative that a limit- ing orifice valve be installed within 5 pipe diameters (5D) of the gas connection. Standard 4575 HiRAM® burners can be used with Natural Gas or Propane. They are not designed for fuel rich operation, or fuels that contain Propylene or Hydrogen. Prolonged fuel rich opera- tion may damage the burner.
Flame supervision systems will detect a pilot flame more reliably if the main burner air pressure is set at or below 1.5 osi (2.5" wc). Direct spark igniters light 4575 HiRAM burners more reliably when the combustion air pressure is set below 4.0 osi (7"w.c.). See Sheet 4000-2 for general details concerning direct spark ignition. Ports on the bottom of a burner can get blocked with debris, and spark igniters work best when installed in the top or side positions. Avoid configuring the ignition/flame supervision ports on the bottom quadrant of the burner. Torch lighting is not recommended because of high tile pressures. HiRAM® burners (except the -8-A and -14 sizes) are available in dual fuel (gas/light oil) models -- see Bulletin 6575. A gas pilot is required for lighting oil in a 6575. To avoid damaging spark igniters and flame rods, they must be removed from their ports before the backplate with attached internals are disassembled from the main body. UV flame detection can be used for all HiRAM® sizes or flame rods in 4575-9 through 4575-14 sizes. See table below for pilot, igniter, and flame rod part numbers.
COMBUSTION AIR CAPACITIES scfh (for Btu/h HHV, multiply by 100)
Flame length (stoichiometric ratio,
Burner
combustion air pressure drop across the burner in osi (inch w.c.)
designation
0.2 (.35)
1 (1.73) 9 400 13 300 21 000 23 800 28 000 42 700 64 000
4 (6.9) 19 600 29 500 44 000 47 600 57 500 81 500 124 000
9 (15.6) 31 000 43 600 64 000 72 500 85 000 118 000 188 000
16 (27.7) 41 500 62 000 89 000 101,000 119 000 164 000 250 000
16 osi air)
4575-8-A 4575-8-B
4 400 5 250 9 200
5' 6' 9'
4575-9
4575-10-A 4575-10-B
10 600 12 500 19 100 34 000
8'
10' 10' 17'
4575-12 4575-14
Air capacities not burning, scfh (use to size blowers)
combustion air pressure, osi Maximum excess air rates in %
Direct spark igniter 4055-E 4055-E 4055-E 4055-E 4055-E 4055-E 4055-E
Burner
Pilot set
Flame
designation
1
9
16
16 osi 55 000 81 000 116 000 145 000 177 000 199 000 388 000
Rod
4575-8-A 4575-8-B
325 650 800
400 500 900
350 750
4011-12 4011-12 4011-12 4011-12 4011-12 4011-12 4011-12
— —
4575-9
1200
4-25432-4
4575-10-A 4575-10-B
675
800
900
4-25432-4 4-25432-4 4-25432-11 4-25432-11
1100 1500 1200
1300 1200 1200
1200 1000 1200
4575-12 4575-14
Do not operate fuel rich. (consider a 4821-R for rich high velocity operation)
Bulletin 4575 Page 3
Medium velocity 4575 burners operate at reduced air pressures compared to the high velocity versions listed above.
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