December 2, 2008
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Home / Tech Trends / The Butler Unit Provides an Efficient Aalternative to welding

04.09.2008

The Butler Unit Provides an Efficient Aalternative to welding

Increasing pipeline system dependability is among one of the most crucial issues for oil companies. At the same time, equally important is reducing pipeline construction time without losing quality. This is especially true in case of production areas located in the regions, where short summers, boggy grounds and permafrost restrict construction time. As a solution for the above problems, the Service TT company offers a service enabling fast pipeline construction using a unique method, which employs a Butler unit. Property of Service TT, this unit uses a mechanical pipe joint system SURE-LOCK (taper-and-bell joint). 
The Butler mechanical pipe joint system (SURE-LOCK) is employed worldwide. SURE-LOCK method invented by a U.S. engineer Major Butler in 1970s is quite a novelty for Perm region.
The Butler method is unique in enabling to join pipes mechanically, withoug welding. The long-time experience in using this technology proved mechanical pipe joining to be as dependable as conventional welding.
The SURE-LOCK mechanical pipe joint systems and BULLS-EYE pipe-calibration systems are approved by Rostekhnadzor (Safety and Technical Supervision Committee) to be used in pipeline construction on the Russian Federation territory.
The Butler technology offers:
the possibility to speed up pipeline construction by five to eight times.
cost effectiveness.
ecological cleanness and safety of construction process;
possibility to build in any weather conditions;
possibility to reduce personnel engaged in laying the  pipeline.
This technology is based on pressing one of the pre-manufactured (taper-bell) pipes into another. Prior to joining, Butler epoxy-resin based sealant is placed on the taper zone on the outside of the tapered pipe end and inside the bell.
Epoxy sealant does not affect the joint strength and used only to ensure 100-percent corrosive resistant joint seal. It also creates corrosion-resistant environment inside the joint, which is of paramount importance when joining pipes with internal coating. At the ends of steel loops aluminum protectors can be installed to protect a pipe against electrochemical corrosion.
As a result, a quality joint is produced that makes ultrasonic and X-ray inspections unnecessary. Mechanical taper-and-bell pipe joints that were made using Butler method are subject to 100 percent  functional inspection of technological parameters for pipe preparation and joining modes, as well as to 100 percent visual inspection and destructive control after every 200 joints.
On introducing this method, the mechanical joints have been repeatedly tested both by independent laboratories and directly by the equipment users. The experience of Butler Tech International proves the joint faults to be 0.0001 percent.
In case of this method,  steel pipes  with internal and external insulation are used.  The pipe coating remains intact, and that is especially important for the purpose of corrosion preventing. Together, these features make the pipeline operation very efficient and reliable. 
At present, Service TT has a resource potential sufficient to build nearly 100 kilometers of pipeline a year using the Butler method.
This new technology appears to be interesting for many oil and gas majors. Today, Butler fast construction method is used to build oil pipelines on LUKOIL-Komi’s and LUKOIL-Perm’s sites. Also, it is planned to build pipelines and field facilities for well clusters of TNK-Nyagan.

 

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