Project plannin

g

FSR

4.321

FLEXWELL® Safety Pipe

Basic planning parameters

Routing

Routing with branching off pipes

Where a number of differently located users need to be sup-

plied by piping, this is normally done with conventional pipin

g

by laying feeder lines branching o

ff from the main line. This

makes it necessary to install T-branches, creating extra wor

k

on site. In the case of underground piping this also creates an

extra risk, since the branches can neither be seen nor easil

y

checked for leaks.

The flexibility of FLEXWELL® Safety Pipe allows it to be laid ac

-

cording to the “looping in” method familiar from high-voltag

e

power cables (see the diagramme)

.

A

User

FLEXWELL

®

Safety Pip

e

looped in

,

no branches

undergroun

d

“Looping in” means

:

1. The actual branching-o

ff pipe, illustrated as a bridgeover,

lies in an area where it is protected or easy to check (e.g. i

n

a manhole pit or the boiler room.)

2. There is no connection to be installed by hand in th

e

ground. This means that the corrosion-proo

fing fitted during

manufacture in our factory is at no point interrupted in th

e

underground routing

.

Corrosion-proofed and completely monitorable T-branches

can be delivered for special cases. We would like to point ou

t

however that “looping in” is normally much more economical

than fitting monitorable T-branches

.

Main supply line wit

h

B

C

branching feede

r

lines and T-branche

s

as used i

n

conventional pipin

g

The looping in method

Pipe gradient, existing supply lines, stray current

s

It makes a lot of sense to lay FLEXWELL® Safety Pipe wit

h

the gradients normally used in piping construction in order to

be able to easily evacuate and vent the pipes or systems. I

n

heavily built-up areas it is often the case, however, that alread

y

existing supply lines cross the planned routing. As long as no

minimum distances between lines are stipulated by law or b

y

the owners, FLEXWELL® Safety Pipe can simply be “threaded”

through the crossing lines or led around other obstacles (see

the diagramme). This only applies to positive pressure line

s

however. In the case of suction pipes, upward “jumps” greater

than the internal diameter of the inner pipe are not permissible.

The rules of good engineering practice for pipelaying must be

observed in all cases. In particular the properties of the trans

-

port media must be taken into consideration.

FLEXWELL® Safety Pipe is protected from stray currents due

to its uninterrupted PE casing. This is proved by a 20 kV high

voltage test in factory. In the vicinity of direct-current instal-

lations (tramlines, cathodically protected piping) it can b

e

laid without there being any disadvantages to any part of the

installation expected.

Routing around underground obstacles

04.05.2022 Subject to technical changes. Page 13