Analysis of fluid transport and selection criteria for steel

[Abstract] works with a wide range of steel, often in the actual project mix phenomenon. In this paper, the existing standards in China, a brief analysis of the fluid transport pipe manufacturing, materials and use of relevant technical requirements.

[Keywords:] steel tube; standards; specifications; materials

[Abstract] Great variety of steel pipes are required in the projects, which causes the confusion of pipes' utilization in the actual construction. On the basis of combining with the current standards of our country, this article briefly analyzes the corresponding technical requirements about the manufacture, materails and utilization of the steel piping for fluid transportation.

[Keywords:] Steel piping; Standards; Specifications; Materials

1. Introduction
Steel pipe manufacturing standards in China, there are structural steel pipe and fluid transport of the points. Structural steel used primarily in metal structures such as bridges, steel frame, etc., it is only required to ensure strength and stiffness, and tightness of the pipe not a requirement.

Steel is mainly used for the conveyance of fluids with pressure fluid transfer, which in addition to ensure that the requirements in compliance with the appropriate strength and rigidity, but also sought assurances that closed, that is required in the factory steel hydraulic pressure test by the root. To pressure pipes , it is often the medium transport flammable, explosive, toxic, corrosive, temperature, pressure medium, it should be used for fluid transport pipe. in practical engineering, procurement and construction, often found with mix or replace structural steel pipe for fluid transport phenomenon, which affect the quality, resulting in hazards or cause of the accident, which is not allowed. The following national standards on the basis of several fluid transport pipe manufacturing, performance, specifications, materials and application scope of analysis.


2. Fluid transport and the use of standard steel
Transmission fluid with the standard range of steel pipe, steel pipe in practice due to a variety of nature, technology, media, different fluid transport pipe manufacturing method, welding, materials, specifications, etc. are also different. For the production, construction, maintenance, etc. convenience, and better distinguish different types of steel pipes, tubes and prevent fluid transfer between the mix of other types of steel or misuse, according to national standards, this article on the following four typical analysis of fluid transport pipe.

2.1 low pressure liquid delivery pipe.

GB/T3091 <<low pressure liquid delivery galvanized welded steel pipe>>, GB/T3092 <<low pressure liquid delivery welded steel pipe>> standard furnace welded steel pipe is generally (and sometimes also used for resistance welding manufacturing), which in addition to fluid transport items will be seized with the pipe, the only additional requirements of the bending test, so this kind of steel fabrication, inspection requirements are relatively low. Their size ranges from 1 / 8 "~ 6" thick wall thickness and grade level of ordinary two, material grades are Q195A, Q215, Q235A three, applicable to the design temperature of 0 �� ~ 100 ��, the design pressure of not more than 0.6MPa water and compressed air systems.

2.2 The general fluid transport pipe.

Normal fluid transport pipe for fluid transport are common high-frequency spiral welded steel pipe, general fluid transport spiral submerged arc welded pipe, seamless steel tubes for fluid transport three.

2.2.1SY/T5038 <<general transmission fluid with high-frequency spiral welded steel pipe>> is used in welding steel, the size range DN150 ~ DN500, wall thickness from 4.0mm ~ 10.0mm 9 kinds of specifications, materials, brands are Q195, Q215, Q235 three, for the design temperature does not exceed 200 ��, the medium is water, gas, air, heating, steam and other common fluids.

2.2.2SY/T5037 <<general fluid transport spiral submerged arc welded pipe>> is used in arc welded steel, the size range of DN250 ~ DN2500, wall thickness from 5.0mm ~ 20.0mm total of 15 kinds of specifications, materials, brands are Q195, Q215, Q235 three, for the design temperature 0 �� ~ 200 ��, the design pressure of not more than 1.0MPa water, gas, air, heating, steam and other common fluids.

2.2.3GB/T8163 <<transmission fluid with seamless steel tubes>>, is the application of one of the largest steel pipe manufacturing standards, its manufacturing methods are hot-rolled, cold drawn, thermal expansion in three ways, size range from DN6 ~ DN600, wall thickness from 0.25mm ~ 75.0mm 66 kinds of specifications, materials, brands are 10,20,09 MnV, 16Mn total of 4, for the design temperature is less than 350 ��, the design pressure of less than 10.0MPa, the oil, gas and public media conditions general fluid transportation. reposted elsewhere in the Research Papers Download http://www.hi138.com 2.3 boiler tubes.

Steel tube used in the transport of fluids are commonly used in low and medium pressure boiler seamless steel tubes, two high-pressure boiler seamless steel tubes.

2.3.1GB3087 <<low and medium pressure boiler seamless steel tubes>>, its manufacturing methods are hot-rolled, cold drawn in two ways, size range DN6 ~ DN400, wall thickness from 1.5mm ~ 26.0mm, and other specifications, materials, There were two grades 10,20, for low and medium pressure boiler superheated steam, boiling water and other media.

2.3.2GB5310 <<high-pressure boiler seamless steel tubes>>, is a include carbon steel, chrome molybdenum steel, stainless steel pipe manufacturing standards for a variety of materials, manufacturing methods are hot-rolled, cold drawn in two ways. The size range To DN15 ~ DN500, wall thickness from 2.0mm ~ 70.0mm, and other specifications, carbon steel grades only 20G one, suitable for high pressure boiler superheated steam media.

2.4 stainless steel tube.

Stainless steel pipe for fluid transport are fluid transport stainless steel seamless pipe, boiler, heat exchanger with stainless seamless steel pipe two.

2.4.1GB/T14976 <<fluid transport stainless steel seamless pipe>> is a generic stainless steel pipe manufacturing standards, its manufacturing methods are hot-rolled, cold drawn in two ways, size range DN6 ~ DN400, wall thickness from 0.5mm ~ 15.0mm 33 kinds of specifications, materials, brands are 0Gr18Ni9 (TP304), 00Gr19Ni10 (TP304L), 0Gr17Ni12Mo2 (TP316), 00Gr17Ni14Mo2 (TP316L), 0Gr18Ni9Ti (TP321), 0Gr18Ni11Nb (TP347), 1Gr18Ni9Ti (not recommended), 0Gr25Ni20 ( TP310) a total of 19 species, for general fluid transfer.

2.4.2GB13296 <<boiler and heat exchanger of stainless steel seamless pipe>> is a special stainless steel boiler and heat exchanger tube manufacturing standards, manufacturing methods are hot-rolled, cold drawn in two ways. The size range is DN6 ~ DN100, wall thickness from 1.2mm ~ 13.0mm, and other specifications, materials, brands are 0Gr18Ni9 (TP304), 00Gr19Ni10 (TP304L), 0Gr17Ni12Mo2 (TP316), 00Gr17Ni14Mo2 (TP316L), 0Gr18Ni9Ti (TP321), 0Gr18Ni11Nb (TP347), 1Gr18Ni9Ti (not recommended use), 0Gr25Ni20 (TP310), 25 species.


3. Conclusion
All kinds of steel pipe for fluid transport material, performance, specifications and standards applicable to conditions there are stringent regulations, not only structural steel and steel pipe can not be mixed with fluid transport, a variety of fluid transport tube can not freely mix between. So in the actual construction of all the fluid transport pipe, fittings and welding materials used should be aware of the following questions: 1, note that in the production and construction in strict accordance with the appropriate standards in the selection; 2, attention must be in accordance with the design documents types of requirements, specifications, material selection, etc.; 3, note that the construction should be in accordance with their production technical level required for use; while steel factory must have a quality certificate and certification, production and construction materials should be identified and inspection and test status flags, etc., so as not to mix the serious consequences.


References
[1] GB/T3091 <<low pressure liquid delivery galvanized welded steel pipe>>
[2] GB/T3092 <<low pressure liquid delivery welded steel pipe>>
[3] SY/T5038 <<general transmission fluid with high-frequency spiral welded steel pipe>>
[4] SY/T5037 <<general fluid transport spiral submerged arc welded pipe>>
[5] GB/T8163 <<transmission fluid with seamless steel tubes>>
[6] GB3087 <<low and medium pressure boiler seamless steel tubes>>
[7] GB5310 <<high-pressure boiler seamless steel tubes>>
[8] GB/T14976 <<fluid transport stainless steel seamless pipe>>
[9] GB13296 <<boiler, heat exchanger with stainless steel seamless pipe>>
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