Siemens LFL Series Service Manual download pdf (Page 6)

GAS PRESSURE

The adjacent diagram shows minimum pressure losses

along the gas supply line depending on the maximum

burner output operation with natural gas.

Column 1

Gas manifold pressure measured at test point 1)(B),

with:

• Combustion chamber at 0” WC;

• Burner operating at maximum output;

• Combustion head adjusted as indicated in diagram

(C)p. 8.

Calculate

the approximate maximum output of the

burner as follows:

- subtract the combustion chamber pressure from the

gas pressure measured at test point 1)(B).

- Find the nearest pressure value to your result in

diaram (A).

- Read off the corresponding output on the left.

Example

• Maximum output operation

• Natural gas

• Gas pressure at test point 1)(B) = 4.09“ WC

• Pressure in combustion chamber = 1.18“ WC

4.09 - 1.18 = 2.91“ WC

A maximum output of 4094 MBtu/hr shown in diagram

(A) corresponds to 2.91” WC pressure.

This value serves as a rough guide, the effective deliv-

ery must be measured at the gas meter.

(A)

D2441

(B)

D3188

Δp [“WC]

1 2 3 4 5 6 7 8 9 10 11 ... 27 28

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Siemens LFL Series Service Manual Page 6