Abstract:
A method for forming a coating film on an internal surface of an elongated tube, includes longitudinally holding the elongated tube, applying a coating solution to the internal surface of the elongated tube; and drying the coating solution while carrying out a heat process for sequentially heating the elongated tube by using a heat source. The heat process includes adjusting the descending rate of the heat source so that a through-hole in the elongated tube is clogged with the coating solution whose viscosity is reduced by heating of the heat source, and sucking the through-hole in the elongated tube from the lower side thereof so that a portion of the through-hole that is clogged with the coating solution moves downwards along the elongated tube.
Abstract:
The previously carried out internal coating of contact tubes not only required very much manual labor and was very time consuming, but it was also unsatisfactory in regard to adhesion of the contact liquid to the surface and homogenity of the catalyst. By the simultaneous action of heat on the liquid interface in the tubes during the lowering of the liquid level as well as by a specially suited apparatus for this purpose which operates according to the principle of communicating tubes there is provided the possibility of a good adhesion to the surface as well as the formation of a homogeneous layer at very little operating expense.
Abstract:
An assembly for connecting pipe lining machine to a device to be pulled through a pipeline or the like is provided in which a coiled connector spring is attached between the device to be pulled through the pipe and the lining machine. A keeper member fixed to the connector is designed to be removably connected to a cement lining machine while permitting relative rotation thereof.
Abstract:
An applicator for applying a layer of coating material around the circumference of an internal surface of a bore within a member, such as on the internal surface of an elongated socket. The applicator includes a chamber which has an elongated portion which can be inserted within the bore of the member to be coated. This chamber is then filled with the coating material to be applied. When the member to be coated is arranged on the elongated portion of the chamber, such arrangement is sensed and serves to actuate a mechanism for providing an opening within the elongated portion. Coating material then passes through this opening into contact with the internal surface of the member.
Abstract:
A method and apparatus for temporarily straightening and spinning of pipes wherein at least three sets of rollers are used, each set including four rollers of which two are rotatably mounted in fixed locations and the other two of which are movable by hydraulic driving means, one or more of the fixed location rollers being drivable; collars, each made of three hinged segments, are used around the pipe, which collars are circumferentially stronger than the pipe wall; by pressing the movable rollers against the collars, the collars are held closed and the pipe is held straight while being spun. The invention is particularly although not exclusively applicable for use in a process of lining of pipes.
Abstract:
A uniform, continuous layer of a drag reduction material is applied to the internal wall of a conduit by injecting into the conduit the material in liquid form via an apparatus capable of applying the liquid to the internal conduit wall. The apparatus supplies the liquid to the wall at a rate proportional to the rate of travel of the apparatus through the conduit. The drag reduction material may be injected into the conduit either prior to the injection of the apparatus or may be contained in a chamber within the apparatus.