THREADED CONNECTION FOR STEEL PIPE

A threaded connection for steel pipe is provided that prevents galling on the sealing surfaces during make-up while providing high sealing performance after completion of make-up. The pin (10) includes a nose (112) including a pin taper guide surface (112a) and a pin sealing surface (113) including...

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Bibliographische Detailangaben
Hauptverfasser:	SHIN UGAI, MASAAKI SUGINO
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 is provided that prevents galling on the sealing surfaces during make-up while providing high sealing performance after completion of make-up. The pin (10) includes a nose (112) including a pin taper guide surface (112a) and a pin sealing surface (113) including a taper surface (113a). The box (20) includes a nose-receiving portion (22) including a box taper guide surface (22a), a box sealing surface (23) including a taper surface (23a), and a buffer surface (24). The taper angle of the taper surfaces (113a, 23a) includes a second taper angle larger than the taper angle of the taper guide surfaces (112a, 22a). The threaded connection (1) is constructed so as to satisfy Dp2>Db2>Dp1 and Lb2>Lp2. The buffer surface (24), located between the box taper guide surface (22a) and taper surface (23a), as a length of 0.75 mm or larger, and is located outward of a imaginary plane (V) determined along radial directions. FIG. 3