Brugg Pipes - Flexwell

Instructions for Laying

7 Installing the connections

The pipes must be aligned straight for about 1 m around

the connections and the manhole shaft entries. Similarly,

if FSR 100 or above pipes need to be bent through tight

radii in front of the shafts, which can only be done with the

electrohydraulic bending device, this must already have

been carried out.

Before installing the connections, the manhole through-

entries must be mounted on the pipe. There is no chance

to push them subsequently over the connections once

these have been installed. Steel shaft entries can also be

mounted after the installation of the connections.

8 Tests on site after installation of the connections

All the piping laid must be visually inspected after laying

and installing the connections/sleeves. Leak tests of

the connections with bubble-forming liquid, additional

pressure tests of the piping can/must be carried out.

9 Leak tests

Leak tests on the connection of the inner carrier pipe

Pressurize the inner carrier pipe with max. 1 bar nitrogen or

clean, dry compressed air and spray bubble-forming leak

detection fluid onto the connections from outside. Observe

the connection for about 2 minutes. Bubbles will form if

there is an untight spot. If you identify a leak, depressurize

and investigate to find the reason. Repeat the leak test until

no more bubbles appear.

Leak test of the outer containment pipe

The leak test on the outer containment pipe can be carried

out on single pipes or multiple pipes simultaneously. If you

want to test several pipes together, you must connect the

valves of the monitoring boots by means of pipes or hoses.

Fill nitrogen or clean, dry compressed air into the surveil-

lance space at max. 1.0 bar. Filling has been completed

when the set value is reached and stays constant (pressure

is equalized over the entire length of the pipe).

Spray bubble-forming leak detection fluid onto the connec-

tions or monitoring boots from outside. Bubbles will form if

there is an untight spot. If you identify a leak, depressurize

and investigate to find the reason. Fix it. Repeat the leak

test until no more bubbles form.

19.08.2024

KIWA Subject to technical changes.

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