API and Special Application Drill Pipe

Roschen manufactures a full line of drill pipe in nominal sizes from 2 7/8" to 7 5/8" in E, X, G and S grades and with a wide range of API and non-standard wall thicknesses. Sour service grades are also available by special request.
 

The raw material supplied to Roschen is manufactured by reputable tube and tool joint suppliers at industry recognized facilities. All of these products are thoroughly inspected upon receipt to verify that they meet Roschen specifications. Specially selected steels with stringent cleanliness requirements provide enhanced fracture toughness that translates into greater safety margins for the end user....

CONNECTIONS Roschen provides pipe with API threaded connections for each of the various sizes. In addition, SDP-DS compatible double shoulder connections are available.

This connection uses a standard API thread form with a secondary internal shoulder. It offers significantly improved torque performance over conventional API connections.

DESIGN The life of the drill string is maximized by designing pipe that is resistant to fatigue. Fatigue stress is primarily concentrated in areas where there is a sudden change in geometry. In drill pipe this is the upset area adjacent to the tool joint weld. It consists of a transition from the thin cross-sectional area of the drill pipe body to the thick cross-sectional area of the tool joint. The longer and smoother the manufacturer can make the upset transition area the better it is for resisting stress concentrations. This is done by making the transition zone between the body of the pipe and the tool joint as smooth and gradual as possible. Using the company's special upsetter, Roschen is able to manufacture an extended internal upset with a shallow run-out angle that blends seamlessly into the pipe body's internal diameter. This greatly improves the pipe's performance and helps to ensure it will not fail in this stress prone region. To reduce fatigue even further, Roschen also grinds both the internal and external diameters of the assembled pipe adjacent to the weld line.

Tool joint forgings are required to meet or exceed API specifications. Prior to assembly, each tool joint is inspected to guarantee dimensional properties and tested to make sure they provide proper mechanical integrity. Tool joints are normally supplied two inches longer than standard API lengths providing additional re-cut capability and greater service life. Longer lengths can also be supplied by special request.
 

ROSCHEN@ INC.                                 
ROSCHEN@ GROUP LIMITED
ROBERT ROSCHEN@ LIMITED
ROSCHEN@ HOLDINGS LIMITED    
HEFEI ROSCHEN@ TOOL CO., LTD.
ROSCHEN@ GEOLOGICAL TOOL CO.,LTD.
SHANGHAI ROSCHEN@ INTERNATIONAL CO., LTD.
ROSCHEN@ GEOLOGICAL INSTRUMENTS CO., LTD.  
EMAIL: roschen@roschen.com ; roschen@roschen.net
Website: http://www.roschendrill.com
http://www.roschenmining.com
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