The four major pipelines of the power plant include:
1: Main steam pipeline (two high temperature and high pressure steam pipelines between the superheater outlet header and the high pressure main steam valve interface);
2: Hot reheat steam pipeline (two high temperature and high pressure steam pipelines from the outlet header of the reheater to the interface of the medium pressure main steam valve);
3: Cold and reheat steam pipes (two high temperature and high pressure steam pipes between the high pressure cylinder exhaust port and the reheater inlet header interface);
4: High-pressure water supply pipeline (the high-pressure boiler supply water pipeline between the outlet of the electric feedwater pump and the inlet header of the economizer).
And special high-pressure pipes and fittings (elbows, flanges, tees, big and small ends, elbows) for the four major pipelines.

Chemical equipment refers to the process piping used in the downstream processing equipment of oil refining and ethylene including carbon steel pipes and stainless steel pipes (seamless and welded): the commonly used carbon steel pipe materials are 20# (GB/T8163), 20G (GB5310). 20g and 20# (GB9948) are rarely used. If it is used for Class A pipes, it must be 100% UT; the commonly used steel grades for stainless pipes are generally 304, 316L, 316Ti, etc.
Chemical equipment in a purely theoretical sense generally does not use CrMo steel and CrMoV steel grades. The entire equipment processing technology does not involve high temperature and high pressure hydrogen conditions, and emphasizes the corrosion resistance of the material transportation pipeline.
Special steel grades include Monel, Mo2Cu, etc.

Oil and gas pipelines are assembled by connecting individual pipes one by one. Modern oil and gas gathering pipelines and oil and gas pipelines are made of steel pipes connected by electric welding. There are many kinds of steel pipes, such as seamless pipes, spiral seam pipes, and straight seam pipes. Seamless pipes are suitable for pipes with a diameter of less than 529 mm. Spiral seam pipes and straight seam pipes are suitable for large diameter pipes. The cross-sectional structure of the gathering pipeline is composed of inner coating-steel pipe-outer insulation layer-heat preservation (cold insulation) layer; the simple one has steel pipe and outer insulation layer, while the inner wall coating and heat preservation (cold insulation) layer are both The oil and gas transportation process must be determined.

Drilling platform piping system can be divided into: bilge piping system, ballast water piping system, ventilation piping system, fire piping system, daily water piping system, drilling water piping system, compressed air piping system, fuel piping system, lubricating oil piping system, Hydraulic transmission piping system, steam piping system, boiler feed water and sewage condensate piping system, sea water (cooling water) piping system, exhaust piping system, solid control piping system, mud piping system, ash and slurry piping system, piling piping system, etc. And other purposes

Polyurethane insulation steel pipe insulation pipe for heating is widely used in liquid and gas transmission pipe network, chemical pipeline insulation engineering, petroleum, chemical industry, central heating network, central air-conditioning ventilation pipe, municipal engineering, etc. High-temperature prefabricated direct-buried thermal insulation pipe is a direct-buried prefabricated thermal insulation pipe with good thermal insulation performance, safety and reliability, and low engineering cost. Effectively solve the problems of heat preservation, sliding lubrication and waterproofing of pipe ends of prefabricated direct-buried heat insulation pipes for high temperature heat transmission at 130℃-600℃ in urban central heating. High-temperature prefabricated direct-buried thermal insulation pipes not only have advanced technology and practical performance that are unmatched by traditional trenches and overhead pipelines, but also have significant social and economic benefits, and are also powerful measures for heating and energy saving. High-temperature prefabricated direct-buried thermal insulation pipes adopt direct-buried heating pipeline technology, marking that the development of China's heating pipeline technology has entered a new starting point.

Ship pipelines are pipes used to connect various mechanical equipment on ships to transmit water, oil, gas and other related working fluids. There are two types of marine pipelines: power pipelines and marine system pipelines. The power pipeline is a variety of pipelines for the main engine and auxiliary machinery, including fuel, lubricating oil, cooling water, compressed air, exhaust, waste heat and other pipelines. The ship system pipeline is to improve the ship's sinking resistance and stability, and to meet the normal life needs of the crew and passengers. There are many ship systems, including a water supply system for supplying sea water and fresh water for the entire ship; a ballast water system for adjusting the ballast of a ship; a bilge water discharge system for removing bilge water; and a compressed air for the entire ship. Compressed air system for fire fighting; fire fighting system for fire fighting, etc. Most of the equipment used in these systems, such as pumps and compressors, are electric and can be controlled automatically.