Insulating Pipes / Steel Pipe Anticorrosion Process Epoxy Spraying Coating And 3 Layer HDPE Coating Process

Steel Pipe Anticorrosion Process Liquid Epoxy Spraying Coating and 3 Layer HDPE Coating Process

Product description
Polyurethane spraying polyethylene wrapping pre-insulated pipe production line is used for the production of polyurethane prefabricated direct buried thermal insulating pipes, which are widely used in the field of heating, cooling and crude oil transportation.

The polyurethane sprayed polyethylene thermal winding insulation pipe production line independently developed by Huashida, consists of three parts: External shot blasting and derusting production line, polyurethane spraying production line, and PE winding production line. The line has a number of national patents, and the third-party standardized evaluation report has a technology advanced level of 5, reaching the domestic leading level. And won the first set of technical equipment in Shandong Province.
The line adopts continuous spraying production process. High automatic, fast production efficiency, saving raw materials, increased foaming and closed cell rate, lower water absorption rate, trinity molding, and more reliable performance. Products with low carbon environmental protection have higher economic and social benefits.

Pipe structure

Rigid polyurethane spraying polyethylene winding prefabricated directly buried insulation pipe consists of steel working pipe, spraying polyurethane rigid foam insulation layer and winding polyethylene outer protective pipe. See the following figure for product structure

Technological flow:

Technological flow of the polyurethane coating steel preinsulated pipe equipment:

1. Remove rust from steel pipe surface

2. preheat the steel pipe to get it ready for polyurethane spraying

3. Spray polyurethane evenly on steel pipe outer surface

4. Wrap melted HDPE strap around the PU foam

5. Trim the pipe ends

Features of the polyurethane spraying PE winding insulation pipe

(1). Density, thermal conductivity, compressive strength and other indices of the polyurethane insulation layer are uniform and consistent. Therefore overall performance of the pipe is superior.
(2). The polyurethane insulation layer is formed by free foaming. Since polyurethane is foamed perpendicular to the axial direction of the pipe, compressive strength of the insulation layer is improved.
(3). The polyurethane insulation layer is formed after spraying. The raw materials are sprayed onto the outer surface of the steel pipe in a liquid form, and then begins to foam. Due to the high reaction activity of the spraying polyurethane raw materials, adhesion between steel pipe surface and polyurethane foam layer is stronger.
(4).Roughness of the surface of polyurethane foam layer is more conducive to increase bonding effect between insulation layer and outer HDPE protective layer.
(5). Polyurethane insulation layer can be sprayed according to the thickness required by customers with a thickness of 15-20mm. Costs can be significantly saved.
(6). Prefabricated directly buried insulation pipes produced using the "spray winding" process, with polyurethane insulation layer and polyethylene outer protective layer thickness adjustable according to users needs. The production process does not require additional molds and tooling, making it simple and easy to operate. Due to the absence of expansion stress on the polyethylene outer protective layer during foaming in the "spray winding" process, thickness of the polyethylene outer protective layer can be relatively thinner, reducing costs for customers.
(7). The polyethylene outer protective layer is formed by circumferential winding, therefore circumferential elongation and tensile strength are significantly improved. Circumferential strength of polyethylene protective layer is stronger.
(8). As this is a completely automatic production line, Production speed is improved and production quality is consistent and superior.

Other supplier racks

The integrated welded structure, without adjustment devices, cannot be installed when the ground is uneven. The height of the stand cannot be adjusted, resulting in uneven rolling of steel pipes on the stand, too fast rolling, or difficult rolling, which poses a safety hazard.

Main accessories

1. Our Factory

Qingdao Huashida Machinery Co., Ltd. is located in Qingdao High & New Technology Industrial Area- Qingdao Huashida industrial Park, covers an area of about 4000 square meters. We have tens of years experience in plastic pipe, sheet, and board extrusion lines, and pipe joints and welding tools such as heat shrinkable sleeve, Electro fusion sleeve etc.

2. Our main products

Our main products include as following,

HDPE PU pre-insulation Jacket Pipe extrusion line

3PE steel pipe anticorrosion&coating machinery

Rubber&plastic foam flexible insulation tube/sheet production line

HDPE water supplying pipe extrusion line

PE PP sheet board extrusion line

Heat shrinkable sleeve production line

Hollow wall spiral pipe production line

Plastic welding rod extrusion line

Radiation cross-linked PE heat shrinkable sleeve

Electro fusion tape

Portable extrusion welder

3. Our products Application.

Our machines make products what are widely used as jacket pipe of PU foam insulation pipe in municipal heating pipe system; Municipal water supplying and drainage pipeline; Oil and gas pipeline; Pipe joints of plastic drainage water pipes, PU foam insulation pipelines, 2PE/3PE oil and gas pipelines;

Besides manufacturing machines, we also make Heat shrinkable sleeves and electro fusion sleeves and plastic welders, which are widely used as pipe joints and sealings of plastic drainage water pipes, PU foam insulation pipelines, 2PE/3PE oil and gas pipelines;

4. Our certificates and Patents

5. Our Purpose and Market

Our purpose is to supply highest cost-effective products and the most suitable solutions to our clients, as well as intimate help and service, on this basis we reach a win-win situation.

For over 14years We have exported to many foreign countries, such as Russia, Iran, Turkey, U. A. E, Sudan, Ukraine, Uzbekistan, Azerbaijan, South Asia, Poland etc.

6. Guarantee and after service

The guarantee period is 12 months from the date of installing, but no more than 14 months from the date of delivery. After this period we are obliged to provide with lifelong service at the expense of Buyer.

During the warranty period we are responsible to provide trouble shootings and help the customer to solve the problems, provide spare parts which are broken, except breakings caused by the Buyer.

We will provide the technical service train the workers from the buyers for free.

We can also send technicians to the buyer's companies abroad for help installation and testing the lines. But the buyer shall pay for the round trip tickets, accommodation, transportation, medicine treatment and insurance of the technicians in foreign countries and some salary accordingly.