Abstract: The present invention provides a system for supplying a lubricant necessary for efficiently manufacturing high-quality seamless pipes or tubes in a piercing mill, an apparatus for manufacturing seamless pipes or tubes having the supply system, and seamless pipes or tubes manufacturing method. The system for supplying a lubricant has a storage tank of the lubricant, a plumbing extending from the storage tank to a position near disk rolls, a nozzle provided at the tip of the plumbing, a device for switching flow direction provided in some midpoint of the plumbing, a plumbing extending from the device for switching flow direction to the storage tank, and a device for releasing pressure in a plumbing, provided between the switching device and the nozzle.

Abstract: An apparatus which can thinly and uniformly apply a highly viscous lubricant on the threaded portion of a threaded joint for pipes comprises a steel pipe support unit which supports a steel pipe P having a pin while rotating the pipe, a lubricant circulation system in which a lubricant having its viscosity adjusted so as to be sprayable is circulated, a metering unit having a metering pump capable of metering the lubricant, a lubricant spraying unit having spray guns for spraying lubricant through nozzles toward the pin, a spray gun support unit which supports the spray guns so as to be movable in the axial and/or radial directions of the steel pipe P; and a controlling unit which controls the rotational speed of the steel pipe P by the steel pipe support unit and the speeds of movement of the spray guns by the spray gun support unit.

Abstract: The present invention provides a system for supplying a lubricant necessary for efficiently manufacturing high-quality seamless pipes or tubes in a piercing mill, an apparatus for manufacturing seamless pipes or tubes having the supply system, and seamless pipes or tubes manufacturing method. The system for supplying a lubricant has a storage tank of the lubricant, a plumbing extending from the storage tank to a position near disk rolls, a nozzle provided at the tip of the plumbing, a device for switching flow direction provided in some midpoint of the plumbing, a plumbing extending from the device for switching flow direction to the storage tank, and a device for releasing pressure in a plumbing, provided between the switching device and the nozzle.