Page 136 - PRESS-FIT SYSTEMS FOR DIVERSE APPLICATIONS

3.0 TECHNICAL DATA
SYSTEM DESIGN CONSIDERATIONS

AND TUBE EXPANSION

CONNECTING TUBES MADE FROM DISSIMILAR METAL SPRINKLER SYSTEMS
The UK Water Regulations recommend that tubes and fittings made
from different types of metals shall not be connected directly together
except where galvanic action is unlikely or where effective measures
are taken to prevent it. Galvanic corrosion is a process whereby the
materials that come in to contact with each other oxidises or corrodes.
If you are in doubt, we recommend you refer to the full and detailed
information provided in Water Regulations Guide (G2.11 and R3.2), or
by contacting the Water Regulations Advisory Scheme LPS 1234: Issue 1
info@wras.co.uk. Cert No. 1033a & 1033b
MIXED METAL INSTALLATIONS XPRESS SPRINKLER STAINLESS LPCB
If a transition should be made from one material to another, then The XPress Sprinkler Stainless System (22-54mm) has approval for
contact corrosion must be avoided. It is not allowed to press different application in wet sprinkler systems with a maximum pressure of 16bar.
materials with each other (so only copper tube with copper or bronze Accordingly LPCB system is certified for using XPress stainless steel
fittings, stainless steel tube with stainless steel fittings, galvanized tubes with material code 1.4401 (AISI 316), 1.4520 (AISI 439) and 1.4521
steel tube with steel galvanized fittings) unless stated otherwise. (AISI 444). XPress Sprinkler Stainless is WRAS approved in combination
The advice is to make a detachable connection with a suitable material with 1.4401 tubes.
(e.g. of bronze or brass). We recommend to use bronze or brass fittings XPRESS SPRINKLER GALVANISED LPCB
for the transition from copper/stainless steel to steel. For example,
the package of transition threaded or union fittings in VSH XPress The XPress Sprinkler Galvanized System (22-54mm) has approval for the
copper made of bronze can be considered. For gas installations, application in wet sprinkler systems with a maximum working pressure
combinations must be avoided. of 16bar.

XPRESS SPRINKLER STAINLESS <FM>
The XPress Sprinkler Stainless System (22-54mm) has approval for
application in wet and dry sprinkler system with a maximum pressure of
175 psi (12.1bar).
XPRESS SPRINKLER GALVANISED <FM>
The XPress Sprinkler Galvanized System has approval for application in
wet sprinkler systems with a maximum pressure of 175 psi (12.1bar).

GAS FAMILIES
There are three gas families:
1st Family - manufactured gas
2nd Family - natural gas
3rd Family - LPG, compressed propane and butane gas
Stainless Gas does not have the LBP feature for safety reasons and are
designed for use in internal and external above ground 2nd and 3rd
family gas services.

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