Page 37 - Drinks Dispense & Pure Water - John Guest

Technical Specification

Working Pressure and Temperature Range Collet Covers
Super Speedfit fittings are suitable for the following pressures and Are available as additional security against removal of the tube or to provide
temperatures. a simple means of colour coding. The cover is offered in a range of six
colours. Please see page 26 of this brochure.
Temp. Pressure
Food Quality
5/32” - 5/16” 3/8” -1/2” NSF standard 51 listed fittings in this brochure are produced in Food
4mm - 8mm 10mm - 22mm
and Drug Administration (FDA) compliant materials and are therefore
Air recommended for food quality applications. The majority of fitting in this
- 20ºC 16 Bar 10 Bar catalogue are also supported by a John Guest declaration of compliance to
European Regulation (EC) no.1935/2004
Potable Liquids Maximum Torque Values for
and Air
Plastic Threads BSP, BSPT & NPT.
+1ºC 16 Bar 10 Bar
Plastic threads are not generally as strong as brass threads. Customers
+20ºC 16 Bar 10 Bar and end users should be aware of this when choosing products for their
+65ºC 10 Bar 7 Bar applications. Overtightening of plastic threads will cause undue stress and
eventual cracking and leakage. The maximum torque figures for BSP and
Also suitable for vacuum BSPT threads used on John Guest fittings in mating threads conforming to
the relevant BS or International thread standards are shown below.
Depending on the tube used, under certain conditions fittings may be
used at higher pressures and temperatures. Please refer to our Customer Threads
Services Department for guidance. Note 1 Bar = 14.5 PSIG. 1/8 - 1/4 3/8 - 1/2 3/4
Tube Types Max. Torque 1.5Nm 3.0Nm 4.0Nm
John Guest recommend OEM customers to consider replacing threaded
Plastic Tube - Polyethylene, nylon and polyurethane conforming to the ports with the more modern Cartridge Systems.
tolerances shown below. For soft tubing or thin wall tube we recommend It is recommended that all installations are checked prior to use to determine
the use of tube inserts.
that a seal has been made.
Braided Tube - Use of Tube to Hose Stems listed on pages 11, 16, 18, 21 Maintenance and Replacement Intervals
and 26 is essential when using tube. Use of clamps to retain braided tube John Guest products generally require little maintenance but as a minimum
on barbs is recommended. we recommend routine visual inspection. Frequency of visual inspection will
depend on severity of application and risk of failure. If after visual inspection
Metal Tube (soft) - Brass, copper or mild steel conforming to the tolerances
John Guest products appear damaged, cracked, charred, discoloured, heat
below.
distorted or corroded they should be replaced. Any product that is or appears
Metal Tube (hard) - We do not recommend Super Speedfit fittings for hard to be leaking should be replaced.
metal or chromium plated tubes. Product life is affected by the severity of the application, the hostility of the
working environment and contact with aggressive chemicals or liquids. It
For stainless steel and other polished metal tubes we recommend the use
is therefore important that specific replacement intervals be considered by
of Superseal fittings. These are shown on page 9 of this brochure. specifiers/users/customers based on previous service life or when failure
It is essential that outside diameters be free from score marks and that the could result in unacceptable downtime, damage or injury risk.
tube be deburred before inserting the fitting.
Cleaners and Sanitising of Fittings
The external surfaces of John Guest products must not come into contact
Tube Tolerances with oxidising or acidic cleaners and sanitising agents, for example (but not
Super Speedfit fittings are offered for tubes with outside diameters to the limited to) those below pH 4, high in sodium hypochlorite level (bleach) or
following tolerances. containing hydrogen peroxide. Our plastic material suppliers recommend
ECOLAB Oasis 133 as a suitable cleaner for the external surfaces of
Size (inches) 5/32 - 3/16 1/4 - 1/2 products manufactured by John Guest.
Several different methods exist for sanitising the internal surfaces of fluid
Tolerance (inches) +0.001 / -0.003 +0.001 / -0.004
systems, including sodium hypochlorite, hydrogen peroxide, chlorine dioxide
Size (mm) 4mm - 5mm 6mm - 22mm or ozone. It is entirely the responsibility of the end user to determine if the
chosen method is suitable for use with John Guest products over the planned
Tolerance (mm) +0.05 / -0.07 +0.05 / -0.10 working life of the system. However, to avoid unnecessary early failure, John
Guest requires that the disinfection solution must be immediately flushed out
Installation and System Testing at all draw off points with fresh, wholesome water at the end of the disinfection
period. The solution must not be left in the system. Disinfection solutions
Fittings and tube should be kept clean and undamaged before use. must only come into contact with the internal (fluid carrying) surfaces of the
All tube and fittings installations must be pressure tested after installation to system. If any other surfaces of a fitting come into contact with disinfection
ensure system integrity before handing over to the final user. See also “How solution the whole fitting must be replaced immediately. Polypropylene
to make a connection”. fittings offer greater resistance to aggressive chemicals than Acetal fittings
but do not have the same mechanical properties. John Guest polypropylene
1/4 Turn Valves fittings are generally designated by the part number prefix PP or PPM.
These valves have been designed to allow temporary servicing of Side Loads
downstream equipment and must only be used in the fully open or fully John Guest products are not designed to be used whilst under side load as
closed position. DO NOT USE THESE VALVES: In a partially open position this may adversely affect their ability to function long-term. Always ensure
to control flow; to provide a permanent termination; without tubing assembled tubes have good alignment with the fitting. They must also not be subjected
or plugged (or threaded connections sealed, or as a tap or “faucet”. to any form of impact or other damage, such as being hit or dropped, even
Chemicals accidently. If fittings have damaged or suffered an impact, they should be
replaced immediately. John Guest warranty does not cover loss caused by
For use with chemicals or other potentially aggressive liquids, please refer any form of damage.
to our Customer Services Department. In general, use only water or oil Warranty
based paint. DO NOT ALLOW CONTACT WITH Cellulose based paint, Whilst we give a warranty against defects in manufacture or materials, it is
paint thinners or strippers, solder flux or aggressive cleaners (see Cleaners the responsibility of the specifier to ensure that fittings and related products
and Sanitising). Keep away from ozone generators such as electric motors, are suitable for their application. The installation must be carried out correctly
mercury vapour lamps and high voltage electrical equipment. in accordance with our recommendations, complying with recognised codes of
Super Speedfit fittings are not recommended for use with explosive gases, practice and relevant national standards, and be properly maintained. Please
petroleum spirits, and other fuels or for central heating systems. refer to our terms and conditions of sale.

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