Page 35 - Drinks Dispense & Pure Water - John Guest

10 Sizes Working Temperatures and Pressures - LLDPE

8 Colours TUBE x TUBE 230 psi @70ºF
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ID

0.170”

1/4”
0.187”
16 bar @20ºC
5/16”
x

0.25”

x

3/8”
Strong yet flexible 4mm x 2.5mm 120 psi @150ºF
8 bar @ 65ºC
4mm
x
6mm
7mm
x
10mm
1/2” x 0.375” 150 psi @70ºF
10 bar @20ºC
8mm x 6mm
12mm x 9mm
90 psi @150ºF
15mm x 11.5mm 6 bar @65ºC
1 Bar = 14.5 psi (approx.)
Maximum Working Temperature 150ºF at pressures shown in chart above.
For temperatures above 150ºF customers should refer to our Technical
Help Desk.
The above maximum temperatures and pressures do not take chlorine
content into account. This could reduce service life.
Please note maximum pressure rating for a ‘system’ depends on the lowest
rated component, eg. most John Guest fittings have a different rating from
NSF 51 the tube ratings shown above.
NSF 61 Burst Pressures are approximately 3 times the maximum working pressure.
Pneumatics Applications
John Guest LLDPE tube is suitable for pneumatic applications providing
pressure is maximum 10 bar @ 20ºC (150psi @ 70ºF). At elevated
temperatures(50ºC+) mineral oil will degrade LLDPE tube and, therefore,
LLDPE tube used in pneumatic circuits should be periodically checked and
replaced if necessary.
Tube Inserts
If the tube is used in a warm water system a tube insert is necessary.
Exposure to Ultraviolet Light
Only black tube should be installed in areas exposed to any light if biofilm
growth is considered an issue. In this case other colours must be protected
from exposure to light. Black tube is also UV stabilised and can be installed
where exposed to direct sunlight (UV).
Chemical Resistance

For use of LLDPE with chemicals or potentially aggressive liquids, please
refer to our Technical Service Department.
NOTE: When using cleaning agents or other potentially aggressive
liquids, please ensure compatibility with tubing and fittings. LLDPE is
not recommended for mineral oils, gases and fuels or high pressure
compressed air / pneumatic systems.
Potable Water Applications
John Guest LLDPE tubing is suitable for potable cold water applications with
a maximum chlorine content of 4 parts per million (4 ppm). Heating water
above 70 F (20 C) and or pressures above the maximum will significantly
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reduce service life. Direct exposure to sunlight will also significantly reduce
its useful service. As part of good practice tubing should be inspected
regurlarly. If there is any evidence of damage, hardening or cracking it
should be replaced immediately.

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