High pressure steel pipe is used to manufacture steel pressure vessel and pipeline quality carbon steel, alloy steel and stainless steel seamless pipe.
Manufacturing method is divided into hot-rolled (extrusion, expansion) and (rolling) in two cold-drawn. Wherein the hot-rolled (extrusion, expansion) steel pipe diameter range of 22 ~ 530mm, wall thickness in the range of 2.0 ~ 70mm; cold drawn (rolled) pipe diameter in the range of 10 ~ 108mm, wall thickness in the range of 2.0 ~ 13mm.
High Pressure Steel Pipe has good mechanical properties at room temperature and high temperature, strict quality control, for a variety of workplace under high pressure conditions. High pressure boiler steel pipes are mainly used in the field, high pressure fuel pipe, fertilizer equipment and pipes.
High-pressure pipeline installation with medium and low pressure pipe installation requirements similar, but more demanding, more stringent provisions, therefore, in addition to the requirements, the low-pressure pipe installation requirements, the following requirements should still perform.
Used to install the high-pressure pipe, fittings, fasteners and valves must have passed the test, along with the corresponding technical documentation, should be kept properly transported to the site, clearly marked, placed neatly. Before installation, it should be the inner and outer surfaces wipe clean, and check whether the foreign body inside the channel, is smooth. Check the nozzle and gasket sealing surface roughness meets the requirements, shall not affect the sealing performance of the sealing surface scratches (especially radial scratches), spots and other defects, in addition to the provisions of skimmed pipe, tube mouth and gasket sealing surface coated with oil or butter or white petrolatum protection. High pressure tube inspection and approval by the end of the threaded portion, in addition to the provisions of skim pipes should be painted in order to protect the transfer agent graphite or molybdenum disulfide grease oil.
Pipeline installation, it should use the official fixed pipe rack pipe rack and high-pressure pipes, pipe fittings contact design requirements should install a protective sleeve. When installing the exposed high-pressure flange pipe end thread chamfer. When installing the gasket, do not use a wire dipping advance shall spout and mat coated with butter, soft metal high-pressure washer should be accurately placed in a sealed housing. Flange bolts should be symmetrical tighten evenly, not over, after the bolt tightening, two concentric flanges should be parallel, exposed on the outside of the nut should be 2 to 3 buckle, at least not less than 2 buttons, and each bolt consistent exposed length. During the installation process, not use strong pull, strong push, twist or modify the strong seals and other ways to compensate for the thickness of the manufacture or installation errors. Pipe installation work continuously and as impossible to complete, should be promptly closed the open nozzle. Meter sampling site on the pipe parts should be installed with the pipe.