Analysis of chemical composition of brass pipe tubes

The high-precision brass pipe is a precision-formed zinc-containing copper alloy pipe with high dimensional accuracy, good mechanical properties, easy cutting, excellent thermal conductivity, high strength and good seawater corrosion resistance. High-precision brass pipes are widely used in electric power (thermal power, nuclear power, etc.) generator sets, petrochemical transportation, seawater desalination, sea salt production, shipbuilding and other marine industries, mainly used in the manufacture of various condensers and heats that are in contact with corrosive media. Pipes, such as exchangers, condensers, water supply and oil, filters, pumps and valves. With the development of related industries, especially the rapid development of power, marine and marine industries, the market demand for high-precision brass pipes has risen rapidly. The brass pipe itself is sensitive to stress corrosion cracking. When there is sufficient tensile stress and ammonia-containing corrosive medium at the same time, it will cause stress corrosion cracking. There has been a breakage of the brass pipe in the vacuum pumping zone of the condenser. There is a large tensile stress in some copper pipes. In addition, the ammonia content in the vacuum pumping zone is high. After a period of operation, the stress corrosion is intensified and eventually the copper pipe is broken.

The use of deactivation for more than 3 days, the water side is emptied, open the manhole door to ventilate and dry; short-time decommissioning, to maintain the pumping operation, to prevent the deposition of suspended solids in the circulating water, etc., to slow the deactivation of the condenser. Use maintenance opportunities to check the corrosion, scaling, cleaning, etc. of the condenser equipment, master the first-hand information of the condenser operation in time, and establish an inspection account according to the inspection requirements, standardize the record of the inspection situation, and standardize the condensation. Method for making and storing copper pipe samples. Since the eddy current flaw detection detects the copper pipe that is leaking and not leaking, and detects the hidden danger in the copper pipe, the eddy current flaw detection is based on the theory of electromagnetic induction. When the probe is close to the conductor, the induced eddy current generated by the conductor affects the coil around the probe. The magnetic field causes a change in the coil impedance increment to identify the defect. Eddy current testing plays an important role in mastering the current status of condenser copper pipes in order to better carry out maintenance work. The quality of copper pipes should be checked, and the eddy current testing of condenser copper pipes should be strengthened.