Ref: Sheets 5643-3 & 4 Sheet 5643-1
North American Tip Emulsion Atomizers for #2 to #6 (light to heavy) Oils
5643 Tip Emulsion Atomizers provide atomization and flame patterns superior to those produced by conventional full emulsion atomizers, while requiring only about 25% of the steam or compressed air per gallon of oil. 5643 Atomizers provide better stability, and permit clean operation under cold conditions when used in North American series 6795, 6820 or similar types of burners. Maximum fuel oil viscosity at the burner is 100 SSU.
Table 1. 5643 Atomizer Capacities and Consumption Rates
Atomizing steam rate (no oil flowing)
Atomizer
Maximum Capacity
Indicator number
lb steam/hr
kg steam/hr at 5.6 kg/cm
designation
in US gal/hr of oil
litres/hr
at 80 psi
5643-01 5643-0 5643-1 5643-3
40
150
42
40
18.1
100 200 400
380 760 1520
165 824
140 225 660
64
102 299
2400
From Figure 1 on page 2, find the Steam Ratio that corresponds to the Oil Ratio just determined. Multiply the Steam Ratio times the atomizer’s steam rate (Table 1) with no oil flowing to give the atomizing steam rate in lb/hr at 80 psi for the job. To find the steam rate at pressures other than 80 psi, multiply the answer by the Correction Factor found in Figure 2 for the desired steam pressure. If using compressed air, first find the steam rate in lb/hr at 80 psi (Table 1) and convert to scfm of air at 80 psi by multiplying by 1⁄3 . Figure 2 is used to correct for differing air pressures in the same manner as for differing steam pressures. To convert answers to metric, multiply—
Minimum oil rates are not shown since turndown is dependent on the burner in which the atomizer is used. Use the following method to determine atomizing steam rate at any oil flow rate (within the limits shown above) and at a given atomizing steam pressure (not exceeding 90 psi). Because the “Indicator Number’’ used is an empirical figure based on US units, calculations must be made in US units, and the answer converted to the metric equivalent if desired. Multiply by 1⁄3 to convert from lb steam/hr at 80 psi to approximate scfm atomizing air at 80 psi. Method For Determining Atomizing Steam Rate: Select the atomizer whose maximum capacity least exceeds your desired oil flow rate. Find the Oil Ratio by dividing your desired oil flow rate in gph by the Indicator Number (Table 1) of the atomizer selected ( Oil Ratio = desired oil flow rate, gph ) Indicator Number
lb/hr by 0.4536 for kg/hr scfm by 1.698 for sm 3 /hr psi by 0.070 for kg/cm 2 gph by 3.785 for litres/hr
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