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SHANGHAI TIANYANG STEEL TUBE CO., LTD.

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Product Name

BIMETAL CLAD PIPE

Material

Backing Steel:X42-X80 L360/245NB J55 K55 N80 L80 P110 20 20G...
CRA Layer: Austennitic SS (304 316/316L 321 904L Alloy254SMO N08031...)
Ni Base Alloy (LC2242 2262 Alloy825 Alloy59 N06625 N10276...)
Ni-Cu Alloy (B10/B30 N04400...)

Standard

API 5LD (NO.:5LD-0083)

O.D.

15-300MM

W.T.

(Backing)1.5-36MM

(CRA Layer)0.2-15MM as required

Length

0.5-12 Meter according to buyer's request

Technique

Metallurgical,Mechanical

Application

Ground Gathering Pipeline, OCTG, Transmission Pipeline, Desulfuration, Sewage Discharge Pipe, Seawater Pipe, Heat Exchanger

Application Principle

The wall thickness of base pipe is as the pressure bearing layer to promise the safety, the wall thickness of cladding/lining pipe is as the functional layer to make the base pipe more resistant to corrosion.

 

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Problems of mechanical composite pipe

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Material Selection basis of corrosion-resistant alloy pure material (corrosion mechanism of natural Gas Field)

According to NACE MR0175, the development and production environment of natural gas field can be divided into acidic environment and sweet environment. The acidic environment contains H 2 S and H 2 S partial pressure is greater than 0.03mpa. The sweet environment contains CO2 and Cl-, but does not contain H 2 S or H 2 S partial pressure is lower than 0.03mpa. Corrosion mechanism in acidic environment Corrosion mechanism in acidic environment H 2 S                     H +  +  HS - HS -                      H +  +  S 2- 2H + + Fe            Fe 2+  +  H 2 ↑ Therefore, in acidic environment, in addition to uniform corrosion and local corrosion on the surface of pipes, a series of metal ...
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Advantages of bimetal metallurgical clad pipe

  u   Taking 316L as an example, its yield strength should be greater than or equal to 207Mpa which is specified in API specification 5LC, but still lower than that of ordinary pipeline steel. Therefore, in order to bear pressure, it is necessary to increase the wall thickness, resulting in a substantial increase in material costs. u   Therefore, the bimetal clad pipe is adopted by the oil industry, on the one hand, is forced by the environment, on the other hand, it also has its own unique technical advantages. u   Bimetallic clad pipe combines two advantages: high strength of base pipe and corrosion resistance of lining pipe. Compared with carbon steel and corrosion resistant alloy, bimetallic clad pipe has excellent performance and high cost performance. u   Since 1991, it has been widely used after decades of development. It has also been widely recognized in the petroleum product transportation and refining industry, and the American Petroleum Institute (AP...
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