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09075 Qualification of Lean Duplex Grade Ldx 2101 (UNS32101) for Carcass Material in Flexible Pipes

Picture for 09075 Qualification of Lean Duplex Grade Ldx 2101 (UNS32101) for Carcass Material in Flexible Pipes
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Product Number: 51300-09075-SG
ISBN: 09075 2009 CP
Author: Jonas Gudme and Torben Steen Nielsen
Publication Date: 2009
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Unbonded Flexible pipes have inner armour of stainless steel made from a helix structure of an S-shaped continuous strip. Typically the selected stainless steel grade has been AISI 316L (UNS S31603). The recent development of lean duplex materials has provided attractive alternatives due to the increased strength, good corrosion resistance and lower cost.

The carcass in an unbonded flexible pipe is exposed to the conveyed fluid or gas but protected from marine seawater surroundings. This paper describes acceptance criteria for autoclave testing in CO2 / H2S environments. Observations are made on initiation of pitting and selective corrosion on LDX 2101 (UNS S32101). Results from both short and long term tests are evaluated in order to validate an acceptable duration for autoclave testing.

Key Words: flexible pipe, carcass, lean duplex stainless steel, autoclave testing, acceptance criteria.
Unbonded Flexible pipes have inner armour of stainless steel made from a helix structure of an S-shaped continuous strip. Typically the selected stainless steel grade has been AISI 316L (UNS S31603). The recent development of lean duplex materials has provided attractive alternatives due to the increased strength, good corrosion resistance and lower cost.

The carcass in an unbonded flexible pipe is exposed to the conveyed fluid or gas but protected from marine seawater surroundings. This paper describes acceptance criteria for autoclave testing in CO2 / H2S environments. Observations are made on initiation of pitting and selective corrosion on LDX 2101 (UNS S32101). Results from both short and long term tests are evaluated in order to validate an acceptable duration for autoclave testing.

Key Words: flexible pipe, carcass, lean duplex stainless steel, autoclave testing, acceptance criteria.
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51316-7325-Investigation of the Stress Corrosion Cracking Behavior of Duplex and Lean Duplex Stainless Steel Parent and Weldment Materials in Sour Service

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Lean duplex stainless steel (LDSS) can provide mechanical properties similar to that of duplex stainless steel (DSS) and is less expensive. The focus of this work was to assess the stress corrosion cracking (SCC) and SCC susceptibility of DSS and LDSS in chloride-containing sour water conditions.

 
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