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Appendix - Gas supply pressure

The adjacent tables show minimum load losses along the gas sup-

ply line depending on the maximum burner output operation.

Column 1

Load loss at combustion head.

Gas pressure measured at the test point 1)(Fig. 40), with:

• Combustion chamber at 0 mbar;

• Burner working at maximum output;

• Combustion head adjusted according to the diagram of Fig. 17.

Column 2

Load loss at gas butterfly valve 2)(Fig. 40) with maximum opening:

90°.

Column 3

Load loss at train 3)(Fig. 40) including: adjustment valve VR,

safety valve VS (both fully open), pressure adjuster R, filter F.

The values shown in the tables refer to:

natural gas G 20 PCI 9.45 kWh/Sm

(8.2 Mcal/Sm

)

With:

natural gas G 25 PCI 8.13 kWh/Sm

(7.0 Mcal/Sm

) multiply the values of the tables:

- columns 1-2: by 1.5;

- column 3: by 1.35.

To know the approximate output at which the burner is operating

at its maximum:

- Subtract the combustion chamber pressure from the gas pres-

sure measured at test point 1)(Fig. 40).

- Find, in the table relating to the burner concerned, column 1, the

pressure value closest to the result you want.

- Read the corresponding output on the left.

Example - RS 190/E:

• Maximum output operation

• Natural gas G 20 PCI 9.45 kWh/Sm

• Combustion head adjusted according to the diagram of Fig. 17.

• Gas pressure at test point 1)(Fig. 40) = 14.5 mbar

• Pressure in combustion chamber = 3.0 mbar

14.5 - 3.0 = 11.5 mbar

A maximum output of 2000 kW shown in Table RS 190/E corre-

sponds to 11.5 mbar pressure, column 1.

This value serves as a rough guide; the effective output must be

measured at the gas meter.

To know the required gas pressure at test point 1)(Fig. 40), set the

maximum output required from the burner operation, then:

- Find the nearest output value in the table for the burner in ques-

tion.

- Read, on the right (column 1) the socket pressure 1)(Fig. 40).

- Add this value to the estimated pressure in the combustion

chamber.

Example - RS 190/E:

• Maximum output required: 2000 kW

• Natural gas G 20 PCI 9.45 kWh/Sm

• Combustion head adjusted according to the diagram of Fig. 17.

• Gas pressure at output of 2000 kW, taken from table RS 190/E,

column 1 = 11.5 mbar

• Pressure in combustion chamber = 3.0 mbar

11.5 + 3.0 = 14.5 mbar

pressure required at test point 1)(Fig. 40).

RS 70/E MZ ∆p (mbar)

RS 100/E MZ ∆p (mbar)

RS 130/E MZ ∆p (mbar)

RS 190/E ∆p (mbar)

RS 250/E MZ ∆p (mbar)

kW 1 2

Ø 1”1/4

3970256

Ø 1”1/2

3970250

Ø 2”

3970252

Ø 2”

3970221

DN 65

3970222

465

500 19.9 10.1 7.0 4.2 3.6

550 23.2 11.6 8.2 4.4 3.7

600 26.7 13.2 9.5 4.6 3.9

650 30.3 14.7 10.8 4.9 4.1

700 34.0 16.4 12.1 5.1 4.2

750 37.7 18.0 13.4 5.4 4.4

800 41.5 19.9 14.8 5.8 4.6

814

kW 1 2

Ø 1”1/4

3970256

Ø 1”1/2

3970250

Ø 2”

3970252

Ø 2”

3970221

DN 65

3970222

695

700 34.0 16.4 12.1 5.1 4.2

750 37.7 18.0 13.4 5.4 4.4

800 41.5 19.9 14.8 5.8 4.6

850

900

1000 27.7 20.6 8.9 5.5

1100

1163

kW 1 2

Ø 1”1/2

3970250

Ø 2”

3970252

Ø 2”

3970221

DN 65

3970222

DN 80

3970223

930 25.0 18.6 8.2 5.2 3.9

1000 27.7 20.6 8.9 5.5 4.0

1100 31.9 23.9 10.2 6.1 4.3

1200 36.1 27.2 11.6 6.7 4.6

1300 40.5 30.9 13.1 7.3 4.9

1400 45.9 35.2 15.0 8.1 5.2

1500 51.2 39.6 17.0 8.9 5.5

1512

kW 1 2

Ø 1”1/2

3970250

Ø 2”

3970252

Ø 2”

3970221

DN 65

3970222

DN 80

3970223

1280 9.6 1.3 39.5 30.0 12.7 7.1 4.8

1400 9.7 1.6 45.9 35.2 15.0 8.1 5.2

1600 9.8 2.1 56.5 43.9 19.0 9.8 5.8

1800 9.9 2.7 67.2 52.7 23.1 11.5 6.5

2000 11.5 3.3 - 62.2 27.5 13.5 7.3

2100 12.6 3.6 - 67.6 30.0 14.6 7.7

2290 14.9 4.3 - 77.8 34.8 16.9 8.6

kW 1 2

Ø 1”1/2

3970250

Ø 2”

3970252

Ø 2”

3970221

DN 65

3970222

DN 80

3970223

1250 5.2 1.3 38.2 28.9 12.3 6.9 4.7

1500 7.2 1.8 51.2 39.6 17.0 8.9 5.5

1750 9.3 2.5 64.5 50.5 22.0 11.1 6.3

2000 11.3 3.3 - 62.2 27.5 13.5 7.3

2250 14.1 4.2 - 75.7 33.8 16.4 8.5

2500 17.0 5.1 - - 40.2 19.3 9.7

2650 19.4 5.8 - - 45.0 21.2 10.5

in progr

in progress

D3734

Fig. 40

1 2 ... 47 48 49 50 51 52 53 54 55 56

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