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Corrosion and protection of carbon steel bolts in LNG terminal

LNG terminals are mostly located in coastal areas, in the marine atmospheric environment with high humidity and high salt. According to ISO 12944-2, coastal and offshore areas with high salinity belong to high corrosive environment and are classified as C5. However, a large number of carbon steel bolts are used for natural gas pipelines and utility pipelines in LNG terminal. In this environment, ordinary carbon steel bolts will soon corrode, the bolt corrosion products will expand, and the threads will bite together. It is difficult to screw the nuts during maintenance, and they can only be cut off by gas […]

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Elastic instability analysis of dished head

As one of the main components of the equipment, the structural form of the pressure vessel head has been very mature. If sorted according to the stress conditions, the best is the spherical head, followed by the elliptical head, and then the dished head. The flat cover head has the worst stress, and the calculated thickness of the head with good stress is relatively thin. In our conventional design, the best choice is often between the stress and processing difficulty. Oval and dished heads are used most. Elliptical head: the standard type with long short axis ratio of 2 is […]

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Locking of high strength bolts

The metal structure of amusement facilities adopts four connection modes: welding connection, rivet connection, ordinary bolt connection and high-strength bolt connection. Among them, high-strength bolt connection is commonly used, and the relaxation mode of high-strength bolt is mainly double nut relaxation. The description of bolt connection in the relevant specifications of amusement facilities is too simple, so that in the actual operation process, the operation of amusement equipment enterprises is not very standardized. Due to the incorrect use of high-strength bolts, the fatigue fracture and connection failure of high-strength bolts have become a more hidden accident form of amusement equipment, […]

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How to design pipeline layout

How to design pipeline layout First, a set of beautiful pipe layout pictures, look at the design of other families, do not be blinded by the beautiful pipe layout pictures photos. Want to know how to design high quality piping arrangements? You also want to design such a work? Then the following knowledge can not miss it. Without further ado, let’s take a look at how piping design should be carried out. Requirements for piping layout design (1) piping layout design should be in line with the process piping and instrumentation flow chart requirements. (2) piping layout should be integrated […]

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Production process of stainless steel pipe

Stainless steel pipe is one of the rapidly developing varieties of steel in China, and its output has increased nearly 15 times in recent 20 years. However, due to the gap between process technology and equipment level, many high-grade varieties can not be produced, especially stainless steel and high nickel alloy steel pipes for chemical and nuclear power industries still basically rely on imports. On the key devices of some important equipment in chemical industry, electric power (especially nuclear power) and other industrial departments, stainless steel and high nickel alloy long pipes are often used, with an outer diameter of […]

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Whether the eccentric reducer at the inlet of centrifugal pump is installed on……

To understand this reason, first understand a knowledge point: cavitation phenomenon. Of course, if you only do industrial installation, you don’t need to know so much, because there are complete and correct installation methods in the instructions of each pump manufacturer, and you only need to construct according to the drawings. Cavitation Working principle of centrifugal pump: the driving machine drives the impeller to rotate through the pump shaft to generate centrifugal force. Under the action of centrifugal force, the liquid is thrown to the impeller outlet along the blade channel, and the liquid is collected through the volute and […]

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Judge the cause of tube explosion according to the characteristics of explosio……

The explosion and leakage of boiler tubes is a problem often encountered in boiler operation, which affects the safe and stable operation of the unit. The causes are complex and involve many interdisciplinary subjects, so it is often difficult to make a correct judgment on the causes. The “rapid” emergency repair method can not fundamentally solve the accident, so that the tube explosion of the same reason may occur again, resulting in unnecessary losses. According to the common characteristics of tube explosion in the field, this paper summarizes the methods to judge the cause of tube explosion according to the […]

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Installation of oxygen pipeline

A large amount of oxygen is used in ironmaking, steelmaking, on-line cutting, semi-finished product renovation and other processes in metallurgical plants, which need to be sent to users from oxygen generation station through storage tank and pressure reducing device by oxygen pipeline. The material of oxygen pipe is mostly carbon steel pipe; Stainless steel pipe should be used for the parts with serious corrosion; Small diameter can also be used copper tube or aluminum tube. The diameter of oxygen pipe varies, and the oxygen pipe used in large converter steelmaking can reach 350mm. Oxygen is a kind of strong combustion supporting […]

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Difference and difference of pressure reducing valve, safety valve, pressure s……

Pressure reducing valve, safety valve, pressure stabilizing valve and pressure relief valve are all pressure valves, which are mainly functional differences. The pressure reducing valve is a device that reduces the medium with high pressure to medium with low pressure. The characteristic of the valve is to keep the outlet pressure and temperature within a certain range when the inlet pressure is constantly changing. Safety valve is used to prevent boiler, pressure vessel and other equipment or pipeline from damage due to overpressure. When the pressure is slightly higher than the normal working pressure, the safety valve will automatically open […]

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Experimental study on transverse fretting wear of flange bolts

In order to study the loosening mechanism of flange connection bolts in transverse vibration, the transverse fretting wear test of fasteners was carried out by means of transverse vibration fatigue testing machine, and then the decline process of preload and preload torque of bolt connection under different transverse loads and frequencies was observed, and the wear amount and surface damage were measured. The results show that the decrease of bolt preload can be divided into two stages; At the beginning of the experiment, the decrease of preload is in the plastic deformation stage and the decrease of preload is in […]

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