A.O. Smith SGE Installation And Operation Manual page 34

3
is
Installation
You must use the longest pipe when calculating the pipe length. For example, if
the chimney pipe is 35 metres and the air supply pipe is 32 metres, use 35
metres as the length for the calculation. Next, add the L equivalent for every 90°
and 45° bend to this 35 metres, in the air supply and chimney flue. The
both
following practical example illustrates how to use the table.
Practical example of parallel chimney flue
Example
The figure shows a SGE 60 installation. This has to be fitted with a 25 m parallel
pipe of 100 mm diameter, and eight 90 degree bends. The configuration must
be checked for compliance with the requirements stated in the table.
Appliance with parallel flue gas discharge material
The longest pipe must be used to check the maximum length. In this case, the
chimney pipe is the longest. This is 25 metres. This 25 metres is the sum of pipe
sections 1, 2, 3, 4 and 5. The length of the transition piece can be ignored. The
total number of bends used in the chimney flue and air supply is 8. The bend in
the transition piece can be ignored. According to the table, 4.6 metres per bend
must be added. This brings the total pipe length to:
(2.4 x 8) + 25 = 19.2 + 25 = 44.2 m.
This is less than the maximum length of 800 metres stated in the table. The
installation therefore fulfils the requirements.
34 Instruction manual SGE