A.O. Smith TWI 35-130, Instruction Manual

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Instruction manual TWI 35-130 G/TWI 45-190 G 27
Device with parallel fl ue gas discharge material
IMD-0533 R0
Use the longest pipe to test for the maximum length. In this case this is the
fl ue gas discharge pipe, that has a length of 25 metres. These 25 metres are
composed of the pipe material parts 1, 2, 3, 4 and 5. The length of the transition
piece need not be taken into account. The total number of used bends, in the
fl ue gas discharge and air supply, is eight. The bend in the transition piece need
not be taken into account. According to the table, 4.6 metres shall be calculated
for each bend. This makes the total pipe length:
(4.6 x 8) + 25 = 36.8 + 25 = 61.8 m.
This is shorter than the length of 100 metres given in the table. Therefore the
installation meets the requirements.