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In the early '60's it was predicted, with government encouragement, that all buildings, particularly flats and houses, would be 'factory made'. It followed that the plumbing and heating should be similarly treated and Turner and Wilson was formed in 1964 to develop pre-piped modules with integrated hot water and heating appliances which could be instantly 'slotted' into the building. Because the main market was for high rise flats, this meant the boilers had to be gas-fired; then a great rarity with few people having any experience of it.
The venture was not a success but it did highlight the little appreciated problem at the time with the flues of high efficiency gas boilers; namely terrible condensation problems which permeated masonry chimneys producing some fascinating, but completely unwanted, pschycodelic patterns in higher rooms!British Gas (then known as the Gas Boards) had approached several flexible tube manufacturers to see if they could produce a tube which could be threaded down a chimney. The result was an adapted car heater tube with lead foil substituted for the bitumen impregnated paper of the original. It worked to a certain extent but was too heavy and would unwind at the drop of a hat.
In 1966 Turner and Wilson started to explore the possibility of making a flexible flue liner from stainless steel. The problem was finding someone to roll a suitable steel to a sufficiently thin gauge. This problem dogged the project for nearly two years by which time a subsidiary of G.K.N. had had the same thought, persuaded a steel company to make a special rolling and marketed the product. By accessing the same supplier, we were able to make and test our first machine, entering the market with our first commercial linings in 1968.
In 1980 Turner and Wilson developed the first flue linings to be welded. This was much more difficult than might be thought and over-coming the problems a slow and expensive process. The welded product was a great success and has since been imitated but not equalled.
Frequently Asked Questions
What does the EN 1856 Product Designation mean?
EN 1856 is a European standard covering metal flues, including flexible metal liners. The standard allows for products, to be tested to performance figures stated by the manufacturer, prividing such figures lie within the standard's parameters. The Product Designation indicates to the end user the performance figures to which a particular product has been tested. (Please note that this does not mean that these parameters are not the extreme limits of a product).
Example a product with this designation:
T600 = the test temperature. (This is not the melting point of the material)
N = Pressure range see table
D = Dry flue conditions. W= Wet
Vm = Corrosion Resistance
L40010 = Steel specification
G = Soot reistance. G = yes; O = no.
|Pressure Type||Test Pressure
|Leakage rate/flue surface area
l . s-1 . m-2
|H1||200 and 5000||<0.006|
|H2||200 and 5000||<0.120|
Note that all these tests are conducted under positive pressure.
The porosity rats of Pressure Tests for flexible linings are very onerous; about 100 times less than jointed rigid metal tubes which in themselves are far less than the levels for clay and concrete liners.
Even the lowest pressures in the table are quite considerable, given that flues are completely open ended. To see such pressures in open tubes would be truly phenominal and whey past anything encoutered even in extreme cases.
It should be remembered that because hot gases are considerably lighter than air, flues suck air inwards rather than, as often falsely supposed, expelling gases outwards. Flues are therefore normally under negative pressure.
Gas flows on flues are of a vary low order, even when fan assisted. Flow resistance figures are therefore not relavent.
Question: Why I cannot see XPS documents sent from Turner and Wilson?
An XPS viewer is part of Windows and is enabled by defualt, so if you cannot see documents with a .XPS extension then it is probably for one of these reasons:
The Windows version is XP (except XP Professional) or earlier. XP users can use a free Microsoft download to solve this porblem.
XPS has been delibrately turn off (often in the mistaken belief that it saves disk space or hinders running time). This can easily be tested by going to 'Start>All Programs'.
If 'XPS Viewer' cannot be seen then it has been disabled. To turn XPS on Click Here
|Weldline||Gas (condensing and non condensing), Oil (28 seconds), Prophane, Butane
|Triplelock||Non condensing Gas, Prophane, Butane and Oil (28 seconds)
|Twinflex Professional 316||Dry cured Wood & approved smokeless fuels|
|Twinflex Professional 904||Coal and coal derived products, dry cured wood, wood pellets, non condensing Gas, Prophane, Butane, Oil (28 seconds) and approved smokeless fuels
|Weldline and Triplelock||Size||Length||Diameter||Width|
|Twinflex 316 & 904||125mm||<16M||1.25M||0.3M|