The specific qualities of industrial pipe flanges
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In industries like the petrochemical, gas and oil industries, it is important that the alloys used for the pipe flanges and other fittings meet specific requirements. Depending on their location, and the use to which they will be put, fittings must be strong, and resistant to corrosion, stress, impact, the effects of welding and extremes of pressure and temperature.
For example, stainless steel pipe flanges used for undersea pipelines must be resistant to the corrosive effects of salt water, and must not warp or buckle at extreme depths where temperatures are low and pressures high. Oil refineries need to be sure their pipe flanges are easily welded but desensitised to welding (i.e. that the chromium giving them their anti-corrosion abilities remains active when heat is applied), that they are resistant to high internal pressures, and that they will not perform poorly in extreme weather or when exposed to fire conditions.
All this means the alloys used for industrial pipe flanges have to be of very high specification. Stainless steel alloys are generally one of two types: ferritic and austenitic. Ferritic alloys have high strength but are hard to weld, and possess low resistance to corrosion (improved by high levels of chromium and added elements like titanium and molybdenum.)
Austenitic alloys have a different crystalline structure, which is stabilised with the addition of nickel. This gives them impressive anti-corrosion abilities and makes them easy to weld, but they have less strength than ferritic alloys.
For this reason, duplex alloys are often used, which combine both ferritic and austenitic traits. At Chemi Petro we have pipe flanges in a wide range of specialist alloys, including duplex and super duplex. |
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Author Resource:-
The Article is written by chemipetro.co.uk providing Pipe Fittings and Pipe Flanges Services. Visit http://www.chemipetro.co.uk for more information on chemipetro.co.uk Products & Services___________________________
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This article is free for reproduction but must be reproduced in its entirety, including live links & this copyright statement must be included. Visit chemipetro.co.uk for more services!
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By :
Gen Federico
Submitted
2009-11-20 07:38:32 |
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