Tangshan, Hebei, China
Member Since: 2019
Business Type: Manufacturer/Factory
Directly Buried Three Layer PE Anti-corrosive Steel Pipe
The current domestic anti-corrosive steel pipe adopt epoxy coal tar anti-corrosion, welding epoxy powder (FBE, glassfiber anti-corrosive) and three-layer PE anticorrosive, but from the anti-corrosion structure and various performance, it indicates that three layer PE anti-corrosion should be the first choice, our company has three layer PE anti-corrosive production lines, and we also can undertake 3 PE anticorrosion processing for the steel pipe.
Structure of three layer PE anti-corrosive pipe
Three layer PE anti-corrosive steel pipe carry out the national standard GB/T23257-2009.
Anti-corrosion steel pipe with inner layer of epoxy powder coating, middle layer of adhesive, outer layer of polyethylene
Technological process of three layer PE anti-corrosive pipe
1. Shot blasting degusting processing for the steel pipe:
Before shot blasting degusting,with medium frequency induction heater ,the steel pipe should be preheated to 40 to 60 degree, and then through the shot blasting machine, to remove the water, oil and dirt contamination , derusting grade is up to GB/T9823 - 1988 standard, Sa2.5 level (nearly white level) requirements, the depth on the surface of the steel anchor pattern from 40 to 100 microns.
2. Epoxy powder coating:
Before spraying, the steel pipe will be wrapped in kraft paper on both ends , then use medium frequency induction heater , heated the steel pipe to 190-230 degree, the electrostatic spraying method is adopted to epoxy powder as required amount of powder coating to the steel pipe surface, in the high temperature, combination with base material fastness, its anticorrosion performance is superior, the good resistance to chemical corrosion, coating surface density is smooth, wearable, and anti-High temperature.
3. Extruded adhesive:
According to the requirement of the thickness of adhesive layer and polyethylene, by adjusting the extrusion machine lord motor and screw revolution, to meet the requirements of extrusion amount. When the epoxy powder in a gel form, we adopt lateral winding technology, make the adhesive and PE coated on steel pipe, adhesive epoxy powder ,polyethylene polymerization to form a three layer structure, after molding, with three rows of roller, make three layer structure fusion compaction, make it a whole system with smooth surface, without bubble and defect.
Adhesive performance is stable, strong adhesive force, uniform film-forming.
Temperature of PE extrusion is 230-260 degree; PE aging corrosion resistance is strong, good environmental stress cracking resistance and elongation properties.
4. Cooling of coated pipe
According to the requirements of the three layer structure of the material properties, it requires
slow cooling, temperature of cooling pipe should not exceed 60 degree.
in the production process, using online electric spark leak detector for coating 100% of leak detection and leak detection voltage is 25 KV .it requires no funneled under 25 Voltage leak detection.
6. Coating products processing:
Use groove grinding machine for pipe end for processing and tags
Epoxy powder adhesives and polyethylene epoxy powder material, for example, FBE from American 3M company, Dupont resin adhesive and domestic high quality polyethylene materials.
Specification of Thickness of Anti-corrosive Coating
|Adhesive layer(μm)||Minimum thickness on the coating(mm)|
|Common level(G)||Strengthen level(S)|
Indexes of epoxy powder
|1||size distribution(%)||150μm oversize powder <=3.0|
250μm oversize powder <=0.2
|4||Gel time(200ºC)/(S)||>=12confirm to the requirement±20%|
Indexes of fusion bonded epoxy coating
|4||counter bending(-20ºC,2.5°)||no cracks|
Indexes of adhesive
|3||vicat softening point|
|5||· oxidation induction time(OIT)|
|6||· moisture content|
|8||elongation at break|
Indexes of polyethylene
|1||tensile strength||· axial|
|2||· elongation at break|
(50ºC or 70ºC)
|4||loop tensile stress cracking resistance|
Indexes of anti-corrosive layer
|Two layer||Three layer|
>=70 (cohesive failure)
|2||· cathodic disbonding|
|3||· cathodic disbonding|
(the highest temperature,30d)/(mm)
|5||· counter bending|
Picture of hot water pipe
Xingbang plumbing is the participated unit of the New National Standard in China's insulation pipe industry.
We have participated in formulating three sets national standards:(GB/T28638-2012, GB/T29046-2012, GB/T29047-2012).We have gained ISO9001 International Quality Management System, ISO14001 Environment Management System, GB/T28001 Occupation Health Safety Management System.
Learn more about the production process>>>
1: Are you a manufacturer or a trading company?
We are a manufacturer which has more than 2 0 years' history.
2: Where is your manufacturer? How to visit it?
Our factory located in Yutian Economic Development Zone ,TangShan , China. A bout 1.5 hours drive time to Beijing and TianJin airport . Mainly producing pre-insulated pipes, HDPE outer protection pipe and 3PE anti-corrosive pipe.
You can take a plane to Beijing or Tianjin .then we could pick up you at the airport .
3: How do we control our products' quality?
We have professional quality control workers and quality inspection center(CNAS lab) to control the entireproduction quality.
4: How do you transport these products?
We use straps to hoist pre-insulated pipes, it can avoid no damage to our products, no hooks for lifting pipedirectly. During the handling process, collision, tossing and more ground drag scrolling are strictly forbidden.
In the process of long distance transport, the pipes should be fixed, and not damage outer protecting pipesand insulating layers.
5: Can I customize some other sizes of products?
Yes! We can according to the customer's request.
If you have any other questions, please don't hesitate, contact us.