THREADED CONNECTION FOR STEEL PIPE

A threaded connection for steel pipe with improved sealability against the internal and external pressures is provided. A threaded connection (1) includes a pin (10) and a box (20). The pin (10) includes a male thread (11), a nose (12), a pin shoulder surface (13), and a pin sealing surface (14). Th...

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Bibliographische Detailangaben
Hauptverfasser:	OKU, YOUSUKE, SUGINO, Masaaki
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ENGINEERING ELEMENTS AND UNITS FIXED CONSTRUCTIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PIPES SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A threaded connection for steel pipe with improved sealability against the internal and external pressures is provided. A threaded connection (1) includes a pin (10) and a box (20). The pin (10) includes a male thread (11), a nose (12), a pin shoulder surface (13), and a pin sealing surface (14). The box (20) includes a female thread (21), a box shoulder surface (23), and a box sealing surface (24). The box sealing surface (24) has a seal point (SP) on the taper surface (242) located at the midpoint thereof as determined along the direction of the pipe axis (CL). The distance LsP between the tip of the nose (12) and the seal point (SP) as measured in the direction of pipe axis (CL) is 13 mm or larger. The shoulder angle a between the pin or box shoulder surface (13 or 23) and a plane (VP) perpendicular to the pipe axis (CL) is 2 to 13 degrees. The ratio TBITP of the wall thickness TBof the box to the wall thickness TP of the pin (10) as measured at the seal point (SP) is 1.7 or higher.