Duplex & Super Duplex Tubing, Super Duplex Tubes
Extensive examination and testing concluded that the failure was more than likely caused by Chloride Stress Corrosion Cracking . On twenty third March 2003, the manufacturing tubing within the Shearwater well SW05 failed after the well had been re-perforated.
After work to repair a leaking wellhead valve on the B annulus, the manufacturing casing seal meeting also failed, allowing communication between the A and B annuli. This paper describes the investigation of a excessive strength 25Cr Super Duplex tubing failure on the Shearwater HP/HT platform within the Central North Sea. Examination and analysis work conducted is described; conclusions as to the more than likely reason for the failure are offered, along with suggestions on avoiding related failures. 2205 twin phase steel has medium temperature brittleness, so it is essential to strictly management the method system of heat remedy and welding so as to avoid the prevalence of harmful phases and damage the properties.
The Fulmar wells use a production packer set in the 9.7/8 casing above the liner high; the Pentland properly, SW05, used a liner high completion, with a floating tubing seal stem stung into a polished bore receptacle at the 7 liner prime. A10 ft tubular joint of seven 38 lb/ft 25Cr Super Duplex tubing had split along its complete length and parted close to its connection to the tubing hanger. The initiation website of the failure was found to have originated from a hardened area of modified microstructure, underneath a floor region on the surface floor of the tubular.
We are one of many leading Supplier, Exporter and Manufacturer of Stainless Steel Duplex 2205 Seamless Tubes that's being made up from High Quality of Standard Raw Materials. Time and again referred as the work horse grade, these ASTM A789 Duplex Steel 2205 Seamless Tubes is essentially the most extensively used grade in the duplex family. Well, the principle good thing about a duplex construction in these ASTM A789 Duplex Steel S31803 Tubes is that it unites the approving qualities of a ferritic alloy by the use of these of an austenitic alloy . However, the usage of 2205 Duplex Seamless Tubes have to be restricted to temperatures which are below 600 Deg F. Meanwhile, extended high temperature publicity may be embrittled in these Duplex 2205 Stainless Steel. Tubing strings, also 25Cr high power Super Duplex, are 7 38 lb/ft from floor all the way down to a Tubing Retrievable Safety Valve, altering to five.half 26 lb/ft into the top of the liner.
The most appropriate proportion is that the ferrite phase and austenite section account for about half every, and the number of a certain section can not exceed sixty five% at most, so as to make sure the most effective complete performance. If the ratio of two phases is out of stability, for instance, too many ferrite phases, it's easy to form single-part ferrite in welding HAZ, which is sensitive to emphasize corrosion cracking in some media. Thus, we're the proper selection for a requirement of tube fittings manufactured with world class high quality and required on an urgent delivery foundation.