Page 129 - PRESS-FIT SYSTEMS FOR DIVERSE APPLICATIONS

THERMAL EXPANSION
Maximum spacing of support brackets for 316 System tube, BS 4127 and W541
stainless steel tube and plastic coated and galvanised carbon steel tube When including expansion joints in a system take care not to introduce
tensional stress when assembling and tightening threaded connections.
Size Horizontal pitch Vertical pitch
The XPress range includes male and female connectors for the correct
15mm 1.80m 2.00m
jointing of expansion joints.
18mm 2.10m 2.30m
CORRECT ANCHORING
22mm 2.40m 3.00m
Always ensure the spur used to anchor the branch of a tee or
28mm 2.40m 3.00m
connecting a radiator is long enough to allow normal thermal
35mm 2.70m 3.00m
movement. Forgetting to observe this simple rule can lead to a failure.
42mm 3.00m 3.60m
Incorporating expansion loops or bellow devices into the system can
54mm 3.00m 3.60m help guard against such problems, whilst a horseshoe link or offset (see
76.1mm 3.00m 3.60m diagrams) is an ideal way to counteract continual thermal cycling.
88.9mm 3.60m 4.50m PIPE RESTRAINT
108mm 3.60m 4.50m
In any installation, the system should be supported to ensure the
minimum stress is imposed on the tube/pipe and joints. For the
Maximum spacing of support brackets for copper tube to BS EN 1057 maximum spacing of supporting brackets for internal installations,
please see the tables (opposite).
Size Wall thickness Temper Horizontal pitch Vertical pitch LOCAL WATER AUTHORITY
12mm 0.7mm R250/R290 1.00m 1.50m
We recommend consulting the local water authority when it comes to
15mm 0.7mm R250/R290 1.20m 1.80m pipework accessibility.
15mm 1.0mm R250/R290 1.20m 1.80m
BUILDING IN DIMENSIONS
22mm 0.9mm R250/R290 1.80m 2.40m
All building in dimensions are correct at the time of going to press.
22mm 1.0mm R250/R290 1.80m 2.40m
Pegler Yorkshire reserves the right to change these dimensions without
22mm 1.2mm R250/R290 1.80m 2.40m
prior notice, however to ensure you are using the most up to date
28mm 0.9mm R250/R290 1.80m 2.40m information please refer to our web site
28mm 1.0mm R250/R290 1.80m 2.40m www.pegleryorkshire.co.uk
28mm 1.2mm R250/R290 1.80m 2.40m COVERED PIPEWORK
28mm 1.5mm R250/R290 1.80m 2.40m
Making provision for thermal movement is vital where pipework of any
35mm 1.0mm R250/R290 2.40m 3.00m material is installed under screed or plaster or passes through brick or
35mm 1.2mm R250/R290 2.40m 3.00m blockwork. The preferred practice is to use tubing with factory applied
35mm 1.5mm R250/R290 2.40m 3.00m protective plastic covering incorporating air gaps to accommodate
42mm 1.0mm R250/R290 2.40m 3.00m thermal movement or to pass tubes and pipes through sleeves or
42mm 1.2mm R250/R290 2.40m 3.00m conduits or to lay them in ducts surrounded by loose, inert non-rigid
material such as vermiculite or glass wool. For further information,
42mm 1.5mm R250/R290 2.40m 3.00m
consult the publication BS 66.700:2006 Design, installation, testing
54mm 1.0mm R250/R290 2.70m 3.00m
and maintenance of services supplying water for domestic use within
54mm 1.2mm R250/R290 2.70m 3.00m
buildings their curtilages.
54mm 2.0mm R250/R290 2.70m 3.00m FLUSHING
64mm 2.0mm R250/R290 3.00m 3.60m
The main objective of the flushing process is to remove as much dirt
66.7mm 1.2mm R250/R290 3.00m 3.60m
and debris from the pipework system as possible in order to reduce
the likelihood of system blockage and to create the best possible
circumstances for a successful chemical clean and subsequent water
Maximum spacing of support brackets for copper tube to BS EN 1057
treatment regime so that any hygiene problems and corrosion damage
Size Wall thickness Temper Horizontal pitch Vertical pitch within a system are largely prevented.
66.7mm 1.2mm R250/R290 3.00m 3.60m The level of cleanliness achievable by system flushing is very much
66.7mm 2.0mm R250/R290 3.00m 3.60m dependant on the adequacy of the system design and installation
76.1mm 1.5mm R250/R290 3.00m 3.60m with regard to flushing. Provision should be included in the system for
adequate air venting, draining and bypassing of equipment.
76.1mm 2.0mm R250/R290 3.00m 3.60m
88.9mm 2.0mm R250/R290 3.00m 3.60m Consideration should be given to the ’Flushing Velocity‘ and should be
108mm 1.5mm R250/R290 3.00m 3.60m based on the largest pipe size in the system section to be flushed.
108mm 2.5mm R250/R290 3.00m 3.60m
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