Aluminous model multiple tube

Aluminous model multiple tube appears to have 3 kinds on the market nowadays, PE of ／ of PE ／ AL; XPE of ／ of PE ／ AL; XPE of ／ of XPE ／ AL. The first kind is layer of exterior and interior is polyethylene, the 2nd kind is lining is cross-linking polyethylene, outer for polyethylene, the 3rd kind is layer of exterior and interior all is cross-linking polyethylene, mid layer all is aluminous layer. The first kind is used at system of cold water pipeline normally, hind two kinds are used at heating up conduit normally.
This kind provides material, because its contain a lot ofaluminous layer, can add be able to bear or endure internal pressure intensity, isolation oxygen, CO2 the rustily coercion that what wait and prevent facilities of pair of pipeline is defeated by water, thermal conductivity is good and reduce popular concentration, fight electrostatic and screen sex has very much sure flame retardant the effect, consequently easy be borne by masses place. And be held because of its receive make for copper, stainless steel makes thread sealed pipe fitting, join relatively convenience, do not want extraordinary thing, get close to with interface of iron pipe of casting of very much nowadays existence, show its sure advantage consequently. This kind of canal is used at doubt of system of cold water pipeline less, but use at system of hot water pipeline to make much doubt with respect to existence, principal as follows:
1, place of juncture of aluminous layer solder is weak point, build canal of model of the aluminium that receive solder especially, consequently place of break with of hydraulic pressure experiment seams line vicinity in solder mostly. This should be caused take seriously. Produce consequently the company is producing in the process, should choose the welder with fine quality, progress as far as possible the intensity that welding line is in, those who cut margin of aluminous layer welding line dash forward pointed, prevent to happen to center stress harmfully.
2, aluminous layer and plastic layer, especially with cross-linking polyethylene the felt force of the layer is weaker, make aluminous model canal is being used at system of hot water pipeline, cause cent simply to take off and damage. This is principal because,be firstly, produce the company is in when choosing thermosol glue, to drop cost, choose the goods with poorer quality; Secondly, in process of aluminous canal figuration, choose in vain dried meat glossily, reduce drag force, cause next stick those who receive a dose receive intensity to be affected; Thirdly, multiple tube of aluminous to cross-linking model, because the languid of cross-linking polyethylene is lazy, cause stick receive intensity to drop.
3, multiple tube of aluminous to cross-linking model, because some factories are in what the cross-linking of hydrolysis cross-linking or evaporate that boil does on this working procedure to be no good, cause cross-linking polyethylene the cross-linking of the layer is spent inferior (be less than 65 ％ ) , make intensity of quiet hydraulic pressure of high temperature tubal material drops, the risk coefficient that applies in system of hot water pipeline next is added greatly.
4, multiple tube of aluminous to cross-linking model, some factories to drop cost, cross-linking polyethylene drops artificially in producing the ply of the layer, increase ply of blame cross-linking layer, the intensity of high temperature quiet hydraulic pressure that makes make a valve drops.
5, layer of exterior and interior all the aluminous model multiple tube of cross-linking is used at system of hot water pipeline to suit relatively. And at that time, a lot of company provides the aluminous model that has lining cross-linking only very multi-purpose also at hot water conduit, one should remind here, so do have a lot of risk. In the examination we discover, after canal of a kind of aluminous model is used at hot water conduit (be more than 90 ℃ water especially lukewarm) when, because difference in temperature of exterior and interior is bigger, may present exterior and interior plastic flexibility is abhorrent, and cause contact slack, or brittleness attaint.
6, other what should clarify is, home already had many manufacturer to already used PERT resin at aluminous model multiple tube, produce blame cross-linking is high temperature resistant aluminous model multiple tube, strength of quiet hydraulic pressure of its high temperature is comparative also satisfactory.

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