What are the pre-use maintenance and precautions for plastic-lined pipe fittings?

Everyone knows the importance of pipelines in our lives. Many jobs can only be carried out through pipelines, such as underground pipelines and liquid transportation. Our lives are inseparable from the use of pipelines. With the rapid development of science and technology, many new types of pipes have appeared on the market one after another. Plastic-lined pipe fittings are one of them, which have more performance characteristics than our traditional pipes.

The precautions before use are as follows:

  1. Do not store in the open for a long time, avoid sunlight, rain, violent collision, and stack heavy objects in multiple layers.
  2. The sealing surface must not be scraped, cut, scratched, scratched or collided with hard objects.
  3. It is never allowed to use electric welding, wind cutting, fire roasting, etc. on the pipe fittings and fittings after the lining, and the distance from the heat source should be more than 1 meter.

The use of plastic-lined pipe fittings has undoubtedly brought new development and opportunities to our pipeline industry, and also brought a lot of convenience to our lives. Now it is very popular among users and is very suitable for the current development needs in our country. Good maintenance of plastic-lined pipe fittings will help extend its service life.

Decho is a professional supplier on plastic-lined pipe fittings. If you need any , pls contact us freely by email [email protected]

The processing method of plastic-lined steel pipe determines its performance

The forming principle of plastic-lined pipes used in water circulation transportation:

The steel-lined plastic pipe adopts the original steel body, electric furnace heating, plastic material inner filling centrifugal molding and external hot compress centrifugal processing, and the sealing surface of the connecting flange needs manual hot compress molding. All pipelines and water contact surfaces are all lined with plastic materials, the pipeline connection is convenient and fast, and it has reliable connection strength and anti-permeability. At the same time, all the connection joints are of detachable structure, coupled with the use of pipe fittings that can change direction at will, making maintenance more convenient.

Power pipeline and circulating water pipeline performance advantages:

1. Good corrosion resistance: It is an ideal pipeline for transporting corrosive gas media such as acid, alkali and salt.
2. Good permeability resistance: using rotomolding process or tight lining process, the inner lining is smooth and flat, the friction coefficient is small, and it is not easy to scale, so the permeability resistance is excellent.
3. High operating temperature: under the condition of strong corrosive medium, the applicable temperature range is -29℃—200℃
4. Vacuum resistant. In the range of -29°C to 150°C, it can be used under vacuum conditions. In chemical production, it is often caused by the backflow of local medium due to cooling, longitudinal discharge, and asynchronous operation of pumps and valves to produce a vacuum state.
5. Adopting standardized standard configuration, especially the pipes and fittings used in chemical pipelines are highly interchangeable, which provides great convenience for installation and spare parts.

The rotomolding process design is flexible and can be made into parts with different shapes and sizes. Application and plastic-lined pipes to save consumption costs will also develop in the direction of increasing output.

The plastic-lined pipe is lined with food-grade polypropylene, which can be used in the chemical, food, pharmaceutical and drinking water industries. Common plastic-lined pipes are: polypropylene steel pipes, polyvinyl chloride steel pipes, polyethylene steel pipes, polyolefin steel pipes and polytetrafluoroethylene steel pipes. Because the plastic-lined pipe has good corrosion resistance, weather resistance, soil and marine life, and physical properties, it has been widely used in agricultural production. At the same time, the use of plastic-lined tubes will not produce toxic side effects on agricultural products, and will not breed bacteria, so that the quality of crops can be guaranteed. From an operating point of view, the pipe wall of the plastic-lined pipe is smooth, and at the same time, it can improve transportation efficiency and have a longer life.

 

Decho is a professional supplier of plastic-lined steel pipe . If you need any for your project , pls feel free to contact us by email [email protected]

What are the advantages of UHMWPE tunnel escape pipes?

Ultra-high molecular weight polyethylene tunnel escape pipeline has excellent comprehensive performance, and has unparalleled impact resistance, compression resistance, abrasion resistance, aging resistance, light weight, chemical resistance, sanitation and non-toxicity. It is not easy to adhere and is called “magic plastic” in the world. Therefore, it has broad prospects for citation in the fields of machinery, transportation, textiles, papermaking, mining, agriculture, and chemicals.

1)Light weight, only about 1/3 of the weight of steel pipe, easy to disassemble and transport.

2) The pipeline has good toughness and high impact resistance. It deforms instantly when impacted by a strong external force, absorbs a large amount of impact energy, and then quickly restores its original shape, providing a very safe and reliable guarantee for emergency rescue in highway tunnel construction.

3) The pipe ring has high rigidity, good pressure resistance, and is not easy to deform. When a highway tunnel collapses during construction, its pressure bearing capacity and environmental damage resistance far exceed those of ordinary pipes.

Decho is a professional supplier of UHMWPE tunnel escape pipes. If you need any for your project , pls feel free to contact us by email [email protected]

 

What are the uses of ultra-high polymer pipes?

Ultra-high polymer pipes are called non-metallic pipes, which should belong to plastic products. The raw material of ultra-high polymer pipes is PE, but the molecular weight is much higher than ordinary molecular weight, and the performance is better than ordinary PE materials, such as: wear resistance and resistance Corrosion, impact resistance, yield strength and breaking strength, etc. In particular, its wear resistance is higher than that of materials such as polytetrafluoroethylene, nylon, and carbon steel. Ultra-high polymer pipes were used more abroad in the early days. After continuous research and development, the ultra-high polymer pipe technology has gradually matured in China, and the heavy industry has gradually adopted this type of pipe. It has become a new type of thermoplastic engineering pipe with moderate price and excellent performance. In terms of price and quality, it is a practical ideal pipe.

 

Ultra-polymer pipes can be used for the transportation of various highly corrosive and highly abrasive liquids or solid-liquid mixtures, such as various acid, lye, crude oil, tailings, mud, coal water slurry, and power plant ash and slag discharge and many more. Compared with seamless steel pipes, ultra-polymer pipes have significant advantages and increase service life. Under strong corrosive and high abrasive conditions, the service life can be increased several times or even dozens of times; due to the non-sticky inner wall of this pipe And the friction coefficient is small, which can reduce the conveying pressure or reduce the diameter of the conveying pipe, which is of great significance for long-distance conveying; because the thermal conductivity of this pipe is more than 10,000 times smaller than that of steel, it can greatly reduce the heat preservation cost of the conveying pipe. Transporting crude oil and other materials in cold regions and winter is of great significance.

It can be seen that ultra-high polymer pipes have excellent use characteristics and are used in the mining industry, coal industry, oil exploration, thermal power generation, chemical industry, river dredging and other industrial fields. With the continuous development of industrial technology, the fields in which ultra-polymer pipes will be used will become more and more extensive.

 

Decho is a professional supplier of ultra-high polymer pipes . If you need any for your project , pls feel free to contact us by email [email protected]

What are the commonly used pipeline anticorrosive coatings?

Classification of pipeline anticorrosion

Pipeline anti-corrosion is divided into pipeline main body anti-corrosion and patch weld anti-corrosion

How to choose pipe repair materials?

It depends on the material of the main pipeline anti-corrosion layer. Commonly used mending methods include petroleum asphalt mending, epoxy coal tar mending, adhesive tape mending, powder epoxy mending, and PE heat shrinkable material mending. If the main body of the pipeline is a three-layer PE composite structure, the first choice is the three-layer PE heat-shrinkable joint material. The patching of single-layer epoxy powder coating can adopt three methods: epoxy powder, adhesive tape + primer and three-layer PE heat shrink patching.

What are the commonly used pipeline anticorrosive coatings?

Epoxy anticorrosive coating

  1. Ring primer
  2. Iron red high anti-corrosion and anti-rust primer
  3. Zinc-rich epoxy anti-rust primer
  4. Zinc-rich epoxy anti-rust primer
  5. Cloud iron epoxy anti-rust primer
  6. Cloud iron epoxy anti-rust primer
  7. Hongdan epoxy antirust paint
  8. Iron red workshop primer
  9. Iron red epoxy deck paint
  10. Epoxy enamel
  11. Epoxy anticorrosive top coat
  12. Epoxy coal tar heavy anti-corrosion coating
  13. Epoxy coal pitch anti-rust primer
  14. Black antistatic and oil resistant primer
  15. Black antistatic and oil resistant finish
  16. Inorganic zinc silicate primer

Acrylic \ Polyurethane coating

  1. Polymer interpenetrating network anticorrosive primer
  2. Polymer interpenetrating network anticorrosive coating
  3. Gray aluminum powder graphite alkyd enamel
  4. Polyurethane anti-rust primer
  5. Polyurethane intermediate paint
  6. Polyurethane anticorrosive finish
  7. Acrylic polyurethane enamel

Chlorinated rubber anticorrosive coating

  1. Chlorosulfonated polyethylene topcoat
  2. Chlorosulfonated polyethylene primer
  3. High chlorinated polyethylene topcoat
  4. High chlorinated polyethylene primer
  5. Chlorinated rubber thick build deck paint
  6. Chlorinated rubber thick build anti-rust paint
  7. Chlorinated rubber ship hull paint
  8. Chlorinated rubber anticorrosive finish
  9. Chlorinated rubber waterline finish
  10. Perchlorovinyl varnish
  11. Perchloroethylene external enamel
  12. Perchlorovinyl primer
  13. Perchloroethylene anticorrosive paint

High temperature resistant anticorrosive coating

  1. Silicone heat-resistant primer
  2. Silicone heat-resistant enamel
  3. Silicone heat-resistant paint enamel
  4. Silicone heat-resistant paint
  5. Silicone heat-resistant paint
  6. Silicone heat-resistant paint
  7. Silicone heat-resistant paint

Anticorrosive coating for the inner and outer walls of oil tank

  1. Iron red epoxy modified polyurethane paint resistant
  2. Gray epoxy modified polyurethane paint resistant
  3. Epoxy polyurethane anticorrosive finish

Epoxy oil-resistant finish Interior and exterior wall architectural coatings

  1. Environmentally friendly interior wall paint
  2. Interior wall paint
  3. Exterior wall paint
  4. Elastic exterior wall paint

Special coating

  1. Reflective paint
  2. Fluorescent paint
  3. Gold paint
  4. Plastic paint

Cold galvanized Powder coating

  1. Powder coating
  2. Pure epoxy powder coating
  3. Epoxy polyester powder coating

Color steel plate waterproof coating

  1. Color steel plate waterproof coating
  2. Color steel plate waterproof coating
  3. Stitched polyester waterproof cloth

 

Decho is a professional supplier of steel pipes with anti corrosive coating . If you need any for your project , pls feel free to contact us by email [email protected]

what is cathodic protection?the methods to realize cathodic protection of underground pipelines and its technical requirement

Due to the long pipeline construction period, it is generally required if the soil resistivity is less than 20Q. m, it is necessary to install a magnesium anode for temporary protection and connect it to the pipeline through a test pile. When the impressed current cathodic protection is put into use, the temporary protection is removed. The Cathodic Protection is very important to protect  pipes from corrosion .

what is cathodic protection?

It is a method of polarizing the protected metal into a cathode to prevent metal corrosion. This method has been used for ship anti-corrosion for more than 150 years; it was first used in pipelines in 1928, applying the principle that the cathode is not corroded but the anode is corroded in metal corrosion batteries to metal anti-corrosion technology. The externally applied current is used to force all the surface of the protected metal in the electrolyte to be catholic polarized, then corrosion will not occur. There are two indicators for judging whether a pipeline meets cathodic protection. One is the minimum protection potential, which is the potential of the metal in the electrolyte from cathodic polarization to the stop of the corrosion process; its value is related to environmental factors. The second is the maximum protection potential, which is the highest potential value that the metal surface to be protected can reach. When the cathodic polarization is too strong, hydrogen will evolve between the pipe surface and the coating, causing cathodic peeling of the coating. Therefore, the confluence point potential must be controlled within the allowable range to prevent the coating from being damaged.

Two methods to realize cathodic protection of underground pipelines

impressed current method

The impressed current method uses a DC power supply, with the negative pole connected to the protected pipeline and the positive pole connected to the anode bed. After the circuit is connected, the pipe is polarized cathode. When the pipeline’s ground potential reaches the minimum protection potential, complete cathodic protection is obtained. In order to determine the cathodic protection parameters and appraise the cathodic protection effect of the pipeline, it is necessary to set up inspection points and check sheets along the pipeline. The protection distance of a single station of impressed current cathodic protection is generally up to tens of kilometers, and this method is often used for cathodic protection of long-distance pipelines.

sacrificial anode method

The sacrificial anode method uses a metal with a more negative potential than the protected metal electrode to connect with the protected metal, and the two form a galvanic cell in the electrolyte. Metals with relatively negative potentials (such as magnesium, zinc, aluminum and their alloys) become anodes, which are gradually lost in the process of outputting current, and the protected pipe metal becomes cathodes to avoid corrosion. Therefore, metals with relatively negative potentials are called sacrifices anode.

Technical Requirement for applying cathodic protection .

To be economically reasonable and technically feasible on applying cathodic protection to the pipeline, certain conditions must be met, as follows:

①Ensure the conductivity of the longitudinal connection of the pipeline

②The covering layer of the pipeline must ensure sufficient resistance

③Ensure the electrical insulation between the pipeline and other low resistance grounding devices.

 

Decho is a professional supplier of 3lpe coated pipes , if you need any for your project , pls contact us by email [email protected]

what is Pipeline Anticorrosion? Pipe Anti Corrosion Type and Process Flow

Description of pipeline anti corrosion

Pipeline anti corrosion is a measurement to slow down or prevent corrosion and deterioration of the pipeline under the influence of chemical or electrochemical action or the metabolic activities of microorganisms

What is pipeline corrosion phenomenon?

Corrosion can be understood as a chemical reaction of materials in the environment in which they are located. This reaction will cause the loss of pipeline materials and lead to failure of pipeline components or even the entire pipeline system. Whether the pipeline corrosion will spread, and the extent of the spread mainly depends on the corrosive force of the corrosive medium and the corrosion resistance of the existing pipeline materials. Temperature, concentration of corrosive medium and stress conditions will affect the degree of corrosion of the pipeline.

How many kinds of Anti-corrosion type?

FUSION BOND EPOXY COATINGS

Fusion Bond Epoxy ,is short for FBE coating,using electrostatic spraying method, good fusion with pipe body in same anti corrosive materials, and strong adhesion, but epoxy powder has poor water resistance (high water absorption rate, up to 0.83%), this brings difficulties on the cathode protection design . On-site appliances are in high demanding, difficult to operate, and difficult to control quality. These are the disadvantages .

3PE Coatings

This type of coatings has many good factors, such as pipeline anti-corrosion and sealing is strong, as well as strong mechanical strength, good water resistance , stable quality, convenient construction, good applicability, and no pollution to the environment. PE also has low water absorption rate (less than 0.01%), high epoxy strength, low PE water absorption and good hot melt adhesive flexibility, etc. It has high corrosion resistance and reliability. The disadvantage is higher cost, compared with other joint material .

Cold-wrapped tapes as PF type and RPC type

cold-wrapped tapes as PF type and RPC type is easy on construction. The three adhesives matched make PF- cold-wrapped tapes available in construction under any environment, any season and any temperature conditions.

The characteristics of cold-wrapped tape and 3PE heat-shrinkable tape are: it is suitable for pipes of various materials, and other methods are suitable for pipes in the same or close to the material.

Process flow

Base surface treatment → paint allocation → brush intermediate paint → brush or spray construction → maintenance

Decho is a professional supplier of pipe with all kinds of anti corrosive coated pipes , including 3PE/3PP, FBE. Liquid epoxy , ect . If you need any for your project, pls feel free to contact us by email [email protected]

3PE Coated Seamless Steel Pipe Order for Bangladesh Government Delivered Sucessfully

As buried pipe delivering water, 3PE anti-corrosion coated pipes has been widely used in government projects in various countries. This is the first time for Decho to export 3PE coated pipes since its new establishment in 2018

The customer for this order is a steel distributor in Bangladesh. He has been engaged in steel pipe sales for nearly 20 years and has a good supply relationship with the Bangladesh government. After several email and telephone communications, the customer’s trust on Decho is more sufficient, and a full container quantity is finally confirmed as the trial order. Soon after order received, Decho sorted out the customer’s requirements. Although it is the most conventional seamless steel tube size, We implement each requirement in detail, no matter from the wall thickness to the thickness of the 3pe coatings, the packaging method to the marking. Because we firmly believe that the fulfillment of every small request is the cornerstone of continuous transactions in the future.

We received email that the customer intends to rush to the shipment date by December 20, at the same time ,we just received L/C from bank. We contacted the logistics department urgently to book a position on the 20th. And we purchased the seamless pipe from stock on the same day. After the processing bevel end on the two days, the bare pipe finally arrived at the coating mill . The production of 3PE coating started in the morning ,at noon , the container entered the factory. We make loading work as while as production.Until 21:00 in the evening,The loading work finished. Now,the customer’s order has been loaded and will be arrive to Bangladesh soon. The customer was informed that this order could be delivered to Bangladesh as his expectation. He highly affirmed the efficiency of Decho’s service and promised us that more new orders would be handed over to Decho in the future.

This order is small, but the original intention of serving customers has not changed. Regardless of how big the order is, Decho is a good partner for customers to be relied on

Building the world and striving the world, Decho is doing its best.

what is YK30 tool steel ? Applications and heat treatment of YK30 steel

YK30 steel is an oil-quenched carbon tool steel, often used in stamping dies, fixtures, gauges, paper knives, auxiliary tools, etc.

Characteristic

Vacuum degassing refined steel with stable quality;
Good hardenability, oil-cooled hardening (less quenching and deformation);
Good toughness and wear resistance, durable tools;
YK30 adds Mn and Cr on the basis of SK105 to improve the hardenability.

Applications

Gauges, razors, files, cutting tools: tempering temperature 150~200℃;
Blanking die, stamping die, bending die, finishing die: tempering temperature 180~230℃;
Steel chisel and woodworking cutting tools: tempering temperature 200~250℃.

Chemical Composition

Steel Number: YK30 JIS Corresponding Steel Number: SKS93
chemical composition(%):
C  :1.00-1.10
Si : 0.15-0.50
Mn : 0.60-1.10
Cr : 0.10-0.50
P : 0.030 or less
S: less than 0.030

Heat treatment

Forging temperature: 1050~850℃
Heat treatment conditions:
Annealing: 750~780℃ slow cooling
Quenching: 790~850℃ oil cooling
Tempering: 150~200℃ air cooling

Hardness
Annealing (HB)≦217
Quenching and tempering (HRC)≦63
YK30 transformation point (℃)
Ac725~765 Ar700~600 Ms150

Decho is a professional supplier on YK30 steel . If you need any , pls feel free to contact us by email [email protected]

How are seamless steel pipes produced?

How are seamless steel pipes produced?

The production process of seamless steel pipes is mainly divided into two types: cold-drawn and hot-rolled. The production process of cold-rolled seamless steel pipes is more complicated than that of hot-rolled steel pipes. The pipe billet must firstly be under three-roll continuous rolling, and then sizing test after extrusion. If the surface does not respond to cracks, the pipe will be cut by a cutting machine about one meter length. Then entering into annealing process, the annealing should be pickled with acidic liquid. When pickling, pay attention to whether there is a lot of blistering on the surface. If there is a lot of blistering, it means that the quality of the steel pipe does not meet the corresponding standards.

Main production processes of hot-rolled seamless steel pipes (*main inspection processes):

Tube billet preparation and inspection*→tube billet heating→perforation→tube rolling→steel pipe reheating→fixed (reduced) diameter→heat treatment*→finished tube straightening→finishing→inspection* (non-destructive, physical and chemical, bench inspection) → warehousing

The main production process of cold rolled (drawn) seamless steel pipe:

Billets preparation → pickling and lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspection

 

How to distinguish hot rolled pipes and cold rolled pipes ?

In length, cold-rolled seamless steel pipes are shorter than hot-rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipes is generally thinner than that of hot-rolled seamless steel pipes, but the hot-rolled seamless steel pipes look brighter on the surface without much rough caliber and there are not too many burrs. The delivery conditions of hot-rolled seamless steel pipes is generally delivered after hot rolled or heat treatment. After the quality inspection, the hot-rolled seamless steel pipe must be strictly hand-selected by the inspectors. After the quality inspection, the surface should be oiled, and then followed by multiple experiments. After the hot-rolling treatment, the piercing experiment should be carried out. If the perforation is too large, it must be straightened. After straightening, it is transferred by the conveyor to the flaw detector for flaw detection experiment, and finally the label is affixed, the specification is arranged, and then it is placed in the warehouse.

Decho is able to supply various seamless steel pipes with different specifications and for different usages, if you are interested in our seamless steel pipes, please contact [email protected]