2LPP Coated Pipe


What is 2LPP Coated Pipe?

The 2LPP Coating System is a multilayer powder coating made of two functional components that work together to create a finished product. High-performance fusion-bonded epoxy (FBE) is applied first, followed by a layer of polypropylene, which results in the strongest and most lasting anti-corrosion coating solution now available.

TUSPIPE has the ability to apply a variety of polypropylene anti-corrosion coating solutions that are specifically tailored for distinct subsea production structures. It is possible to use these technologies for straight lengths of pipe as well as field joints, bend, constructed spools, and various other specialized constructions. Depending on the application, they can be developed and installed in a variety of thicknesses and configurations to suit the particular performance and subsea installation requirements in shallow and deep water.

Table of Contents

Product Properties of 2LPP Coated Pipe

The processing of 2LPP anti-corrosion coated pipe commonly adopts Germany DIN 30678 “polypropylene coated steel pipe” standards. 

- Impact Strength of 2LPP Coated Pipe

As part of the impact test, a ball with a diameter of 25mm is dropped on the 2LPP coated pipe sample, which must be supported so that it does not collapse under the force of the dropping hammer. The landing altitude should be approximately 1 m, and the temperature should be 0 °C during the test. It is required that the impact energy E be equal to the coating thickness (5W) J/mm, with a permissible limit of 5 percent of the total impact energy. The radius of curvature of the tube is represented by this coefficient. The impact energy can be reduced by lowering the weight of the drop hammer or raising the height of the drop to a lower velocity.

Nominal Diameter J/mm
Less than or equal to DN65 0.7
DN80 – 150 0.85
Greater than or equal to DN200 1

- Adhesive Strength of 2LPP Coated Pipe

Alternatively, equivalent equipment is established by testing. Using a right angle to the tube surface, the coating must be peeled off at a rate of 10 mm/min while maintaining a right angle. Three samples should be examined at (505) degrees Celsius at the same time. The test should be performed on five more samples if one sample does not satisfy the requirements. Each sample should fulfill the requirements if the first sample does not.

The average force needed for lifting should be the following during the tests as indicated, and no more than 24 hours after application:

  • At the test temperature of (50±5)℃, the width of the sample per weight meter should be at least 100N
  • At the test temperature of (90±5)℃, the width of the specimen should be at least 80N/cm

Advantages of Using 2LPP Coated Pipe

- High Temperature Corrosion Protection of 2LPP Coated Pipe

  • 2LPP coating provides excellent long-term corrosion protection for field joints in subsea settings and may be utilized in tough conditions with operating temperatures up to 10°C (230°F) and with no depth restrictions in subsea environments
  • In addition, the better adhesion capabilities of the FBE result in good resistance to cathodic disbandment, which helps to lower overall costs for the pipeline’s cathodic protection system.

- Excellent Mechanical Protection of 2LPP Coated Pipe

  • A wide range of unique 2LPP coating solutions has been developed to give the greatest level of mechanical protection currently available in the market.
  • In addition, the polypropylene outer layer provides protection against shear pressures and impacts throughout shipment, installation, and the duration of the subsea production structures’ operational lifecycle.

- Wide Application Range of 2LPP Coated Pipe

  • Customized 2LPP coating systems for protecting short straight lengths of pipe and field joints are also available.
  • These coating systems can be applied to fabricate custom parts for subsea production systems, such as bends, spools, jumpers, Pipeline End Terminations, Pipeline End Manifolds, and other similar components.

Minimum Layer Thickness of 2LPP Coated Pipe

Nominal Diameter Minimum Coating Thickness (mm)
Less than or equal to 100 1.8
125-250 2
300-500 2.2
600 or more 2.5

It is acceptable to use a coating thickness of up to 10% less than the necessary thickness on a 1m long pipe, provided that the thinner area does not exceed 5m2. 50 mm ends of tubes less than DN 500 and 100 mm ends of tubes equal to or more than DN 500 should be free of adhesive unless otherwise specified by the Buyer. DN 500 tubes shall be free of adhesive. Unless otherwise stated by the customer, the length of the uncoated ends should not exceed 150mm.

The Service Life of 2LPP Coated Pipe

Operating Temperature(℃) Expected Minimum Service Life (Year)
23 50
60 50
80 30
90 16
100 8
If the coatings are used at alternating temperatures, their expected service life should be inferred from the values made above.

What is PP Coating?

Polypropylene, often known as PP material, is a colorless, odorless, non-toxic, transparent solid substance that is non-flammable. It has a density of just 0.90 –” 0.91g /cm3, making it one of the lightest sorts of plastics available on the market. Under 80°C, it can withstand the corrosion of acids, alkalis, salt liquids, and a variety of organic solvents, but it can break down under the influence of high temperatures and oxidation when exposed to these conditions.

In addition, it is extremely stable to water, with a water absorption rate of about 0.01 percent and a molecular weight of around 81 million 150 million. Excellent molding, however, because of the shrinkage rate (1 percent to 2.5 percent), it is not suitable for usage. Thick wall goods have a tendency to droop, and it is difficult to achieve the standards for some of the higher dimensional precision parts. Good surface gloss is also a need.

A synthetic resin with exceptional characteristics, polypropylene is a thermoplastic synthetic resin with a variety of applications. Polypropylene has been widely developed and applied in many fields since its introduction, including machinery, automobiles, electronics and electrical appliances, construction, textile, packaging, agriculture, forestry, fishery, and the food industry. Its chemical resistance, heat resistance, electrical insulation, high strength mechanical properties, and good high wear-resisting processing properties have made it a popular choice for many industries.

History of the Development of PP Materials

G. Natta was the first to successfully polymerize propylene into polypropylene (using aluminum chloride and titanium as catalysts), and he was also the first to create the idea of directed polymerization, which gained widespread attention.

In 1957, polypropylene production plants with capacities of 6000T/a and 9000T/a were developed by Italian and American businesses, respectively.

Within a few decades, polypropylene had a period of rapid growth from the late 1960s to the mid-1970s.

Because of improvements in polypropylene yield during the 1980s, it is currently just slightly lower than that of polyethylene, placing it in second place overall among synthetic resins.

In 1962, the People’s Republic of China began investigating the technique of polypropylene manufacture. Polypropylene has grown at an exponential rate in China since the 1980s. China has implemented certain modern polypropylene manufacturing technology and equipment, which has resulted in a significant increase in the volume of production and the country entering a stage of rapid development. In 2012, the total manufacturing capacity of PP was 12.967 million tons (million tons). The manufacturing capacity of PP was 20.13 million tons per year in 2015.

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