Siemens LFL Series Service Manual download pdf (Page 15)

PROCEDURE TO REFER BURNER OPERATING CONDITION IN HIGH ALTITUDE PLANTS

- Find the corrected burner capacity for the plant’s altitude in chart 1 and the corrected pressure in chart 2.

- Check in the firing rate graph of the burner (page 5), if the working point defined by the values above is within the range limits.

If not, higher burner size is needed.

Reference conditions (Charts 1-2): Ambient temperature 68 °F (20 °C) - Barometric pressure 394” WC (1000 mbar) - Altitude 328 ft a.s.l. (100 m a.s.l.)

Note

Charts are based only on altitude variation

(reference temperature = 68°F , 20°C)

To get the combined correction in case of different

air temperature, a compensation of 1000 ft each

20°F (305 m each 11°C) is applicable.

Example

Rated capacity = 3000 MBtu/hr - Rated air pressure = 1.5”w.c.

Real altitude = 5000 ft - Real temperature = 108°F

Δ = 108°F - 68°F (reference temp.) = 40°F (equivalent 2000 ft variation)

Proceeding as descripted above and considering a “virtual altitude” of (5000 + 2000) ft:

- the corrected capacity is 3847 MBtu/hr;

- the corrected burner air pressure is 1.92.

Burner RS 160/M LN is OK

m. a.s.l. 0 100 305 610 915 1220 1525 1830 2135 2440

ft a.s.l 0 328 1000 2000 3000 4000 5000 6000 7000 8000

500

494 500 512 530 551 571 593 616 641 669

1000

987 1000 1023 1061 1101 1142 1186 1232 1282 1337

1500

1481 1500 1535 1591 1652 1713 1778 1848 1924 2006

2000

1974 2000 2046 2121 2202 2284 2371 2464 2565 2675

2500

2468 2500 2558 2652 2753 2855 2964 3079 3206 3343

3000

2962 3000 3069 3182 3303 3425 3557 3695 3847 4012

3500

3455 3500 3581 3712 3854 3996 4149 4311 4488 4680

4000

3949 4000 4092 4243 4404 4567 4742 4927 5130 5349

4500

4442 4500 4604 4773 4955 5138 5335 5543 5771 6018

5000

4936 5000 5116 5303 5505 5709 5928 6159 6412 6686

5500

5429 5500 5627 5834 6056 6280 6520 6775 7053 7355

6000

5923 6000 6139 6364 6606 6851 7113 7391 7694 8024

6500

6417 6500 6650 6894 7157 7422 7706 8006 8335 8692

7000

6910 7000 7162 7425 7708 7993 8299 8622 8977 9361

7500

7404 7500 7673 7955 8258 8564 8892 9238 9618 10029

8000

7897 8000 8185 8485 8809 9135 9484 9854 10259 10698

8500

8391 8500 8697 9016 9359 9705 10077 10470 10900 11367

9000

8885 9000 9208 9546 9910 10276 10670 11086 11541 12035

9500

9378 9500 9720 10076 10460 10847 11263 11702 12183 12704

10000

9872 10000 10231 10607 11011 11418 11855 12318 12824 13373

Average barometric

Pressure

(

20°C

)

mbar 1013 1000 977,4 942,8 908,2 875,8 843,5 811,85 779,8 747,8

Average barometric

Pressure (68°F)

"w.c. 399 394 385 371 358 345 332 320 307 294

Rated Capacity

ltitude

CORRECTED BURNER CAPACITY ACCORDING TO ALTITUDE

m. a.s.l. 0 100 305 610 915 1220 1525 1830 2135 2440

ft a.s.l 0 328 1000 2000 3000 4000 5000 6000 7000 8000

0,50

0,49 0,50 0,51 0,53 0,55 0,57 0,59 0,62 0,64 0,67

1,00

0,99 1,00 1,02 1,06 1,10 1,14 1,19 1,23 1,28 1,34

1,50

1,48 1,50 1,53 1,59 1,65 1,71 1,78 1,85 1,92 2,01

2,00

1,97 2,00 2,05 2,12 2,20 2,28 2,37 2,46 2,56 2,67

2,50

2,47 2,50 2,56 2,65 2,75 2,85 2,96 3,08 3,21 3,34

3,00

2,96 3,00 3,07 3,18 3,30 3,43 3,56 3,70 3,85 4,01

3,50

3,46 3,50 3,58 3,71 3,85 4,00 4,15 4,31 4,49 4,68

4,00

3,95 4,00 4,09 4,24 4,40 4,57 4,74 4,93 5,13 5,35

4,50

4,44 4,50 4,60 4,77 4,95 5,14 5,33 5,54 5,77 6,02

5,00

4,94 5,00 5,12 5,30 5,51 5,71 5,93 6,16 6,41 6,69

5,50

5,43 5,50 5,63 5,83 6,06 6,28 6,52 6,77 7,05 7,35

6,00

5,92 6,00 6,14 6,36 6,61 6,85 7,11 7,39 7,69 8,02

6,50

6,42 6,50 6,65 6,89 7,16 7,42 7,71 8,01 8,34 8,69

7,00

6,91 7,00 7,16 7,42 7,71 7,99 8,30 8,62 8,98 9,36

7,50

7,40 7,50 7,67 7,96 8,26 8,56 8,89 9,24 9,62 10,03

8,00

7,90 8,00 8,18 8,49 8,81 9,13 9,48 9,85 10,26 10,70

8,50

8,39 8,50 8,70 9,02 9,36 9,71 10,08 10,47 10,90 11,37

9,00

8,88 9,00 9,21 9,55 9,91 10,28 10,67 11,09 11,54 12,04

9,50

9,38 9,50 9,72 10,08 10,46 10,85 11,26 11,70 12,18 12,70

10,00 9,87 10,00 10,23 10,61 11,01 11,42 11,86 12,32 12,82 13,37

Average barometric

Pressure

(

20°C

)

mbar 1013 1000 977,4 942,8 908,2 875,8 843,5 811,85 779,8 747,8

Average barometric

Pressure (68°F)

"w.c. 399 394 385 371 358 345 332 320 307 294

Rated Pressure

ltitude

CORRECTED BURNER AIR PRESSURE ACCORDING TO ALTITUDE

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 27 28

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