7
Boiler block assembly
Logano G515 – 6 720 647 208 (2014/09) 19
7.6 Leak test
Conduct a leak test of the boiler block only when the boiler was delivered
disassembled. Pre-assembled sections are leak tested in the factory.
For details of assembling the remainder of the boiler if the block is
delivered pre-assembled, see Chapter 10, page 34.
7.6.1 Carrying out leak test
The leak test must be performed with a test pressure of 125 psi (8.6
bar). Use a pressure gauge class 1.0 to measure the pressure.
▶ Close off lower boiler hub ( Fig. 26, [3]) at the front and rear. To
do this, place corresponding seal ( Fig. 26, [1]) on the relevant
boiler hub and screw on flange cover with edge length 4 21/64
inches (110 mm). In this case, the flange with the tapped hole (R ¾)
for the fill and drain connection ( Fig. 26, [2]) is mounted on the
rear of the boiler.
▶ Install the on-site fill and drain valve.
▶ Close off supply and return connections (supply connection flange
with purger valve).
Fig. 26 Fitting the flange
▶ Slowly fill the boiler with water via the fill and drain connection. While
doing this, purge the air from the boiler via the boiler supply
connection with purger.
7.6.2 Sealing leaks
▶ If a hub connection is leaking, first drain the water through the fill/
drain valves.
▶ Remove supply pipe.
▶ Undo nuts on tie rods and remove tie rods.
▶ Separate the boiler at the leak location by driving (knocking) in flat
wedges or chisels between the sections at the points provided at the
top and bottom ( Fig. 27, [1 and 2], between the sections).
Fig. 27 Separating the boiler block
NOTICE: Risk of system damage from overpressure.
▶ Ensure that no pressure, control or safety equipment
is fitted during leak tests.
▶ Use new nipples and new sealant rope for
reassembly.
▶ Pull the boiler back together and repeat the leak test.
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