聚氨酯直埋保溫管一共分為三層

　　A total of polyurethane directly buried insulating pipe are divided into three layers

　　聚氨酯保溫管第一層：高密度聚乙烯保護層，預制成一定壁厚的黑色或黃色聚乙烯塑料管材。它的作用一是保護聚氨酯保溫層免遭機械硬物破壞，二是用于防腐以及防水。

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Pu heat preservation pipe layer 1: high density polyethylene coating, prepared with a certain thickness of black or yellow polyethylene plastic tubing. It is the role of a protection against damage mechanical hard objects to polyurethane thermal insulation layer, the second is used for antiseptic, and waterproof.

　　聚氨酯保溫管第二層：聚氨酯保溫層，是用聚氨酯高壓發(fā)泡機在鋼管與外保護層之間形成的空腔中進行一次性的注入硬質(zhì)聚氨酯泡沫塑料原液而成，這就是俗稱的管中管聚氨酯發(fā)泡。

　　Polyurethane insulation pipe layer 2: polyurethane thermal insulation layer, is to use high-pressure polyurethane foam machine between steel tube and the outer protective layer formed in the cavity of a one-time injection of rigid polyurethane foam plastics concentrate, which is commonly known as the tube in tube of polyurethane foam.

　　聚氨酯保溫管第三層：工作鋼管層，是根據(jù)設計和客戶的要求一般是選用螺旋鋼管、無縫鋼管以及直縫鋼管。

　　Pu heat preservation pipe layer 3: work steel pipe layer, is according to the requirements of design and customer is usually choose the spiral steel pipe, seamless steel pipe and straight seam steel pipe.

　　鋼管表面經(jīng)過了先進的拋丸除銹工藝處理之后，鋼管除銹的等級可以達到GB8923-1988標準中的Sa2級，鋼管表面粗糙度可以達到GB6060.5-88標準中R=12.5微米。

　　Steel tube surface after advanced shot blasting derusting processing, steel tube derusting grade can reach GB8923 Sa2 level of - 1988 standard, steel pipe surface roughness can reach GB6060.5 R = 12.5 micrometers - 88 standard.

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