The boiler is designed to exclude the air in the vessel during manufacturing, installation, overhaul and boiler hydraulic pressure test. Therefore, the steam box or saturated steam outlet pipe, the superheater of each stage, the reheater, the header or the connecting pipe are designed. The air tube. In many cases, air tube leakage accidents occur after the boiler is put into use. The leaking parts are mostly the butt welds of the air pipe and the pipe joint and the fillet welds of the air branch pipe and the air main pipe. The reason for the leakage is as follows: the air pipeline is generally discharged by the installation unit according to the site conditions, and all kinds of supervision and inspection are not taken seriously. The weld joint has no groove, the opposite mouth is skewed, the pipe opening is gas cutting, the weld slag is slag, the air hole is not welded. There are many defects such as penetration, and the internal defects develop into leakage due to vibration, thermal stress and the like during operation.
Boiler sewage draining pipes belong to the installation unit and are laid by themselves according to the site conditions, most of which are laid along the boiler. There are several cases of such pipeline leakage: due to poor welding conditions on the back side of the pipe laying weld, there are many welding defects, resulting in leakage; the pipe and the valve butt welds leak more, the reason is mostly that the pipe is not beveled and the opposite is not the same. , deflection, strong counterpart, etc.; joint pipe joints and pipe butt welds or weld line leakage, mainly because the pipe is fixed on the steel frame, and the header expands with the furnace, due to the frequent start and stop of the boiler, resulting in fatigue of the weld; The pipe bursts due to internal and external corrosion thinning, mainly caused by internal non-flowing hydrophobic and external rain. For such leakage, the boiler draining and draining pipeline can be subjected to spectroscopy and thickness measurement, the thinned pipeline is replaced, and all the welded joints are re-standard welded and non-destructively tested. Re-adjust the pipes that are not expanding.
The superheater and reheater desuperheating water pipes may also leak. There are several cases: the desuperheating water flow orifice leaks, because the boiler original desuperheating water flow orifice plate is flanged, the arrangement is relatively compact, and the flow of each branch pipe, Temperature unequal; pipeline leakage is mostly due to the desuperheating water pipes are generally laid side by side, the pipe and pipe gap is small or even no gap, leakage due to vibration caused by vibration during operation; leakage due to medium erosion and thinning of the pipe wall, mainly occurs in elbows Part; leakage of pipe welds, mainly due to leakage of welds without beveling and welding defects. The following measures can be taken for the above problems: the flange type flow orifice plate is changed to the welded type, and the distance is appropriately pulled for easy maintenance and operation; the whole temperature inspection and thickness measurement of the temperature reducing water pipe are performed, and the wall thinning is replaced. All the welds without beveling are re-welded; the piping system is reasonably arranged and fixed to avoid rubbing, and the insulation with rainproof measures is taken to avoid external corrosion.
Since most of the temperature casings of the boiler main, reheat steam system and water supply system are screw-connected, as the number of start-stops increases after the operation, the medium flow in the pipe causes vibration, which may cause leakage due to the temperature of the casing thread. When the weld is low, the temperature casing is replaced during the adjustment of the unit, which poses a certain threat to the safety and economic operation. The treatment is to change the threaded temperature casing to a welded temperature casing using the unit size.
Double Arm Electric Medical Pendant with multi kinds of gas outlet and power socket can be choosed; The Ceiling Pendant is modular assembly, to make the Medical Pendant suitable to different environment use; it is inevitable choice for operation theater and ICU room;The pendant is mainly used to place monitor, electric knives and medical instruments needed by general surgery operations. Its bearing weight is more than 120kg. It could provide the necessary medical gas, power for operations with output terminal. It is equipped with all kinds of pluggable, quickly-connecting gas terminals.
Double Arm Electric Medical Pendant
Electric Surgical Pendant,Electric Ceiling Pendant,Electric Hospital Pendant,Electric Cavascope Pendant
Shandong Lewin Medical Equipment Co., Ltd. , https://www.lewinmed.com