A pipe coupling inc1udes a pair of half members which have a half-ring shape on the x-y plane and a thickness along the z axis, wherein the half member includes a first end on which a circumferential groove is disposed, the circumferential groove including a first groove surface and a second groove surface which are inclined over the x-y plane; and a second end on which a circumferential protrusion is disposed, the circumferential protrusion including a first protrusion surface and a second protrusion surface which are inclined over the x-y plane, wherein the first groove surface and the second groove surface are inclined over the x-z plane in the same angle and direction as the first protrusion surface and the second protrusion surface.
1. A pipe coupling comprising a pair of half members which have a half-ring shape on an x-y plane and a thickness along a z-axis,
the half member comprising:
a first end on which a circumferential groove is disposed, wherein the circumferential groove comprises a first groove surface and a second groove surface which are inclined over the x-y plane; and
a second end on which a circumferential protrusion is disposed, wherein the circumferential protrusion comprises a first protrusion surface and a second protrusion surface which are inclined over the x-y plane,
wherein the first groove surface and the second groove surface are inclined over the x-z plane in the same angle and direction as the first protrusion surface and the second protrusion surface,
wherein the first end comprises a third groove surface perpendicular to the x-y plane between the first groove surface and the second groove surface,
wherein the second end comprises a third protrusion surface perpendicular to the x-y plane between the first protrusion surface and the second protrusion surface, and
wherein the third groove surface is inclined over the x-y plane in the same angle and direction as the third protrusion surface.
2. The pipe coupling according to claim 1 ,
wherein the half member further comprises flanges disposed at the first end and the second end, and having an elliptical connecting hole, and
wherein a major axis of the elliptical connecting hole is perpendicular to y-z plane.
3. The pipe coupling according to claim 2 ,
wherein the flanges include first flanges disposed at one of the pair of the half members and second flanges disposed at another one of the pair of the half members, the first flanges corresponding with the second flanges via bolts,
wherein the flanges are tightened by adjusting nuts coupled with the bolts so as to tighten the pipe coupling.