Yes, we provide free of charge demonstrations on jointing methods and installation advice either on site or at a customers premises. Furthermore, more detailed seminar presentations can be arranged for groups of consultants or contractors either at Durapipe or at a customers premises. Certificates of attendance will be provided to all attendees.
Tins are marked with a shelf-life of up to 24 months, dependant on the system being used.
It is usually possible to accommodate thermal movement utilising the natural flexibility of the pipework at changes in direction. If there are insufficient changes in direction, other methods would include the inclusion of expansion loops or flexible rubber bellows to accommodate the movement. (Where the use of bellows are proposed, the suitability should be checked with the manufacturer / supplier of flexible bellows).
Mineral wool types such as 'Rockwool', Class 1 HT Armaflex or Phenolic foam types such as 'Koolphen' manufactured by Kooltherm are suitable.
This practise is not recommended. Temporary joints can be made in non-critical situations, provided that both systems are suitable for the application, (e.g. on a cold water system). Joints must be made strictly in accordance with recommendations. PVC-U solvent cement must be used.
Durapipe SuperFLO or ABS remains ductile at temperatures as low as - 40°C and is ideally suited to chilled water applications.
When using Durapipe SuperFLO ABS for a chilled water application, does the pipework need to be lagged?
Durapipe pressured pipe systems can be used at full vacuum conditions providing they are operated at ambient temperatures, We would recommend the use of ABS due to its “safe fracture mode”, if a component fails the whole structure is not at risk of collapse or damage. However, any chemical considerations need to be taken into account before a specific recommendation can be made.
Unfortunately, squeeze off technology developed for PE mains cannot be used on ABS or PVC-U.
What is the lowest/highest ambient temperature at which I can successfully make solvent weld joints?
Temperature is not critical provided that surfaces are kept dry and clean. However, for below zero temperatures, you should allow additional curingtime, as the evaporation rate of the solvent will be slowed down.
Following installation and allowing the appropriate drying times, the suggested method of testing is to fill the mains with water ensuring that no air pockets remain, and carry out a hydrostatic pressure test up to 1.5 times the maximum working pressure (rated pressure) of the system. The pipework is then left pressurised for a period not exceeding 1 hour.
For chemical drainage applications we recommend the use of Vulcathene, which is BBA approved for this duty and is suitable for a mixture of different chemical concoctions used in modern laboratories.
Can the solvent cement jointing process cause toxins within the pipework? Which can then transfer into the fluid that the pipework holds?
We can confirm that solvent cement jointing does not create toxins in the pipework or conveyed fluid. The solvent part of the cement is designed to 'melt' the pipe surfaces and allow easy assembly of components, after which the solvent evaporates away completely to leave a fully welded joint. Durapipe ABS, PVC-U and PVC-C solvent cements have tested and approved for use with cold potable water systems by WRAS (Water Regulations Advisory Scheme).
The minimum cold bend radius for PLX pipes (SDR11 wall section) is 25 times the pipe outside diameter. The safe bending radius for the Offset Fill and vent pipes (SDR17 wall section) is 35 times the pipe outside diameter.
The Vulcathene range does include ‘flexible drain couplings’ for connecting to non-Vulcathene pipework below ground level.
Most of the pressure rated plastic systems can be used at full vacuum conditions at ambient temperatures, but for reasons of 'safe fracture mode' we would normally offer ABS. Any chemical considerations need to be taken into account before a specific recommendation can be made.
Regulation 31 is a list of approved suppliers published by the DWI(Drinking Water Inspectorate), certifying that products have passed confirm with DWI standards following vigorous testing procedures. Regulation 31 covers all products that are between the public water mains through to a property boundary. Durapipe are currently the only pipework manufacturer to hold this approval on both ABS and PVC pipework http://dwi.defra.gov.uk/drinking-water-products/approved-products/soslistcurrent.pdf
Some thread sealants such as Loctite 542 and Boss White can chemically attack the pipework in both PVC-U and ABS, Durapipe recommend that PTFE tape should be used when making threaded joints or connections. Any other means of thread sealant must be confirmed suitable by Durapipe before use.
Yes, Durapipe can offer made to order SCH80 PVC-U Pipework if required up to 24".
No, The Durapipe Guardian PVC-U system can be solvent welded using Durapipe PVC Cement. However if chemical concentrations are above the recommend parameters HCR Cement must be considered. Further details on chemical compatibility can be found within the Durapipe PVC technical brochure.