Sizing 3065 Aspirator Air/Gas Mixers - Table 2
Multiple premix burner arrangements with mixers larger than the three inch -7 size, burners above the -5-A size or with more than 10 burners are prone to flashback. When sizing mixers for mul- tiple burners outside the range of Table 2, use a single mixer for each burner or divide the burners among two or more mixers, and select the mixers from Table 2. Aspirator Mixers for ¾ " Premix Pilot Tips: The premix capacity of ¾ " 4021 and 4027 premix pilot tips is similar to the 4651-01-A burner. To size a 3065 for multiple ¾ " pilot tips use the -01-A data row in Table 2 for ¾ " pilot mixer sizing. Consult the pilot bulletin for actual pilot capacities. The 4031 pilot mixer is often preferred for use with a single ¾ " pilot tip. Pilot ratio regulators should always be cross-connected to the mixture or air pressure taps on the mixer.
Table 2 lists proper selection if several burners are fed from a single 3065 mixer. Burner capacity and number of premix burners (4651, 4659, or 4682) determine mixer selection. Mixer/burner recommendations in Table 2 maintain the required relationship between the mixer orifice size and burner port size for use with zero governor ratio control. Flow distribution and pressure drops should be considered carefully when designing the mixture manifold. To use this table, find burner size in left-hand column, then read across to the mixer designation that appears under the number of burners to be fed.
TABLE 2. Recommended Mixer Selections for Multiple Burners Using Natural Gas
Size desig. - 01 -A Burner
Number of Burners per 3065 Aspirator Mixer
1
2
3
4
5
6
7
8
9
10
3065-0-9 3065-0-8 3065-0-6 3065-0-5 3065-1-7 3065-1-5
3065-0-5 3065-1-8 3065-1-4
3065-1-6 3065-1-5 3065-2-8
3065-2-13 3065-2-11 3065-2-8
3065-2-6 3065-3-5
3065-2-0
3065-3-11
3065-3-6 3065-4-12 3065-5-16 3065-6-24 3065-6-20 3065-6-10 3065-7-34 3065-7-28 3065-7-18
-0-A -0-B -0-C -1-A -1-B -2-A -2-B -2-C -2-D -3-A -3-B -4-A -4-B -4-C
3065-2-8
3065-3-13 3065-3-9
3065-4-16 3065-4-14
3065-3-12 3065-3-7
3065-4-16
3065-4-14 3065-4-10 3065-5-18 3065-5-18 3065-5-15 3065-5-10 3065-5-15 3065-5-10 3065-6-22 3065-6-24 3065-6-20 3065-6-15
3065-2-12 3065-3-13 3065-3-6
3065-4-15 3065-4-11
3065-2-9 3065-2-4
3065-3-10 3065-4-17 3065-4-13 3065-4-5
3065-3-4
3065-4-13 3065-5-18 3065-5-13
3065-2-12 3065-3-9
3065-4-14 3065-5-17 3065-5-9
3065-6-20
3065-6-15 3065-6-6
3065-7-36
3065-2-10 3065-4-18 3065-4-8
3065-5-12 3065-6-22 3065-6-14
3065-7-38 3065-7-34 3065-7-32 3065-7-32 3065-7-28 3065-7-24 3065-7-28 3065-7-20 3065-7-12
3065-2-6 3065-2-0
3065-4-15 3065-5-15 3065-6-24 3065-6-13 3065-7-36
3065-4-11 3065-5-9
3065-6-18 3065-7-38 3065-7-32
–
3065-3-11 3065-4-8
3065-6-24 3065-6-13 3065-7-36 3065-7-30 3065-5-15 3065-6-18 3065-7-36 3065-7-30 3065-7-20
3065-7-24 3065-7-15
– – – – –
– – – – –
3065-3-6
3065-7-4
–
3065-4-16 3065-6-22 3065-7-38 3065-7-28 3065-7-18
– – –
– – –
– – –
3065-4-10 3065-6-14 3065-7-30 3065-7-16
– –
3065-4-8
3065-6-9
3065-7-28 3065-7-4
-5-A
3065-5-14 3065-7-34 3065-7-16
–
–
–
–
–
–
–
For additional information on premix systems and premix system design, see the following sheets:
— Straight pipe run requirements, Handbook Supplement 14 — Jiffy Sheet, Handbook Supplement 288 — Piping Practice for Industrial Burner Systems, Handbook Supplement 46 — Prevent "Pooped" Pilots, Handbook Supplement 289 — Practical Pointers (Industrial Burner Control Systems )
— Series 4651, 4659, and 4682 Burner Nozzles, Sheet 4600-1 — North American Air/Gas Ratio Regulators, Bulletin 7218/7219A — Air/Gas Ratio Regulators, Instructions 7218-2 — Premix Burners, Handbook Supplement 288
Bulletin 3065 page 9
Made with FlippingBook flipbook maker