Instructions for Laying

FSR 8.70.01

FLEXWELL Safety Pipe

Instructions for laying and mounting FLEXWELL Safety piping

FSR DN 12 – DN 150

Please note:

Please read these instructions through before be-

ginning with the laying of the piping and installing

the connection pieces. The instructions apply to the

laying of FLEXWELL Safety Pipe.

Familiarise yourself with the installation instructions for:

– FSR connection pieces with GRAPA or

elastomer seal

– FSR through connections

– FSR elbows and t-connectors

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Important, temperature declaration:

All FSR pipes must be layed at temperatures above

0 °C to rule out damaging the PE layer.

Important, please take note:

The figures given in “bar” apply to the pressure in

excess of standard atmospheric pressure.

All FSR connections described in our instructions

for laying the pipes are intended for installation in

covered manholes, filling shafts, petrol pump shafts

or above ground level or in the shafts.

If it proves necessary to make connections in the

ground, please inform your planning engineer and

sales dealer beforehand.

gradient should be at least 1 – 2 %. Make sure that there

are no stones or pebbles in the sand bedding (sand grain

size < 2 mm). There should be 100 mm of stone-free sand

underneath the piping. At the end of laying the pipes, they

should be covered (once again with stone-free sand) all

around (min. 200 mm backfill). The pipes shall, including

bearing layer, have at least 300 mm total coverage.

For pipes under driving surfaces the laying depth must

be adapted to ground pressure requirements.

Checking the preparations at the manhole covers, filling

shafts, pump mountings and chambers: are the dome

covers and the filling shaft correctly prepared with the right

connecting flanges in the right places? The access man-

hole shafts must have been secured on the tank. The pump

mountings and chambers must be equipped with appropri-

ate arrangements for connecting the piping.

Check whether the complete inventory of piping has been

delivered (the type of piping and the lengths are secured

to the drum) and that all components of the accessory

equipment are present (connection pieces, nominal bores,

pipe through-connections etc.).

If the piping has been delivered in a coil, make sure that the

coil/coils are safely unloaded and stored (and not damaged

by vehicles on the construction site). Make certain imme-

diately that the entire consignment has been delivered in

undamaged condition (piping and accessories).

If a toolkit has been supplied, please read the instructions

for their use through carefully before using them.

Tips for secure storage of the drums: secure unloading of

the drums off the truck must be ensured. Organize the nec-

essary means for this on your construction site, e.g. a static

or truck-mounted crane or a forklift.

1 Basics

Familiarise yourself with the routing plan for laying the

piping. Your planning engineer can give you an excerpt

from this for the individual piping sections. He has access

to computer programs which allow him to do this. Use this

plan to see the sequence in which the piping should be

laid. You will only be able to decide the order in which to

lay the pipes yourself if you already have a great deal of

experience in the laying of flexible pipes.

It is crucial for the sequence of laying the individual pipes

that you avoid reverse gradients as well as unnecessary

crossing of pipes in the routing and that the pipes lie in the

correct order once laid.

2 Preparing the site

Check the routing and the sand bedding of the pipe runs:

they must be wide enough to allow 50 – 100 mm distance

between the pipes. A distance of 150 mm must be allowed

between the outside pipe and the trench wall.

Check the execution of the pipe runs (sand bedding with-

out stones, downward gradient to the tank). The downward

19.08.2024 KIWA Subject to technical changes. Page 39