LPG

Technical Details

5.100

FLEXWELL®-LPG Pipe Systems for Petrol Station

s

System descriptio

n

FLEXWELL®-LPG is is a single walled flexible pipe system

suitable for automotive LPG (Autogas) installations of servic

e

stations in both vapour and liquid phase.

LPG’s main constituents are Propane (C3H8) and Butane (C4H10

)

which have different boiling points : –42 °C for propane and

–1 °C for butane. The actual mixture of propane and butane o

f

any automotive LPG marketed varies considerably from on

e

country to another, depending on their sources of LPG

.

The mix of propane and butane has a profound impact on

design requirements of LPG fuelling components; the one for

a propane only mix being the most stringent. The selection of

the material depends on the minimum temperatures, which

can occur during failure of the equipment, and has been car-

ried out in accordance with the european Pressure Equipment

Directive PED 2014/68/EG

.

FLEXWELL®-LPG Piping is designed for operating tempera-

tures from –50 °C up to +65 °C and operating pressures of

PN 25 (360 PSI).

System advantages

•

•

•

fast and simple to install without welding and x-raying of

welds on sit

e

no downtime and only minimal interruptions to petrol sales

on retro

fits

the most cost e

ffective pipe system

Application

Typically FLEXWELL®-LPG Piping is used as an underground

or above ground liquid feedline and vapour return between

the LPG storage tanks and the liquid gas dispenser in fuellin

g

stations.

Constructio

n

The

flexible composite pipe has a helically corrugated primar

y

pipe. This is manufactured of EN 1.4404 stainless steel

(US equivalent: AISI TP 316 L) and has excellent corrosio

n

resistance characteristics as a result. Around this carrier

pipe, high-strength reinforcing bands are fitted, which effec

-

tively limit longitudinal expansion even at high operating pres-

sures. Corrosion protection for buried installation in the ground

is afforded by an external PE-LD jacket.

Installation

FLEXWELL®-LPG Piping is manufactured in standard factory

lengths up to 700 m. The pipework is supplied on a cabl

e

reel or coil allowing it to be run directly o

ff the reel or coil int

o

position in the pipe trench. The corrugated primary pipe an

d

the helically fitted reinforcing bands give this piping system re

-

markably good flexibility and ease of laying. FLEXWELL®-LP

G

pipework can be cut to the required length on site and, as

necessary, bent through very tight angles to run around, under

or over existing services.

Type testing, approvals

•

•

Certi

ficate for pressure equipment acc. to directive

PED 2014/68/EG Module A1, CE 0620, KIWA declaration

of conformit

y

TÜV-Nord, Germany, report to burst pressure testing of

FLEXWELL® end couplings with graphite sealing

8

7

2

4

6

3

5

1

1 pressure ring

2 core piec

e

3 graphite sealin

g

4 connecting piece with threa

d

5 cylindrical screw

6 clamping rin

g

7 cylindrical screw

8 heat shrink tube

19.03.2026 Subject to technical changes. Page 3