(3) For a long period of time, operating at a low flow rate, the shield pump is inefficient and will cause heat to evaporate and cause the pump to dry and thus damage the plain bearings. 3 shielded pump type and scope of application According to the temperature, pressure, viscosity and particles with or without particles, shielding pump can be divided into the following categories: (1) The basic type of conveying medium temperature does not exceed 120 ℃, lift less than 150m . Various other types of shielding pumps can be based on the basic type, through the modification and improvement. (2) Reverse Circulation In this type of shielded pump, the direction of liquid flow to the bearing lubrication, cooling, and cooling of the motor is exactly opposite to the basic one. Its main feature is not easy to produce cavitation, especially for easy vaporization of liquid transport, such as liquefied petroleum gas, chloroform and so on. (3) High temperature type General conveying medium temperature up to 350 ℃, the maximum flow 300m3 / h, head up to 115m, suitable for hot medium oil and hot water and other high temperature liquid. (4) high melting point pump and motor with a jacket, can greatly improve the motor heat resistance. For high melting point liquid temperature up to 250 ℃. Jacket can pass steam or a certain temperature of the liquid, to prevent the crystallization of high melting point liquid. (5) High-pressure high-pressure shielded pump shell is a high-pressure vessel, the pump can withstand high system pressure. In order to support the shield under internal high pressure, the stator coil can be used to withstand the pressure. (6) When the self-priming suction tube is not filled with liquid, the pump drains liquid by means of automatic suction to adapt to extracting liquid from the underground container. (7) Multi-stage type equipped with multiple impeller, suitable for high-lift fluid delivery, the highest lift up to 400m. (8) Mud type is suitable for transporting liquids mixed with a large amount of mud. 4 shielded pump selection precautions General shielded pump using the transport part of the liquid to cool the motor, and the annular gap is small, so the liquid must be clean. For conveying a variety of liquid mixtures, if they produce precipitation, coking or jelly, then the selection of shielding pump (non-mud type) may block the shielding gap, affecting the pump cooling and lubrication, resulting in burning graphite bearings and motors. Shielded pumps are generally circulating cooling pipe, when the ambient temperature is lower than the freezing point of the liquid pumped, the anti-freezing measures should be used with the accompanying pipe to ensure easy start-up pump. In addition, the shield pump should strictly comply with the opening sequence of the outlet valve and inlet valve at start-up. When the pump is stopped, the outlet valve should be closed first. When the pump operation is stopped, the inlet valve is closed and the outlet valve is closed. In short, the use of shielded pump, completely leak-free, effectively avoiding environmental pollution and material loss, as long as the correct selection, the operating conditions did not abnormal changes in normal operation, almost no maintenance workload. Shielded pump is the ideal pump to transport flammable, explosive, corrosive and valuable liquid.
Socket-Weld Flanges has a female socket in which pipe is fitted. Fillet welding is done from outside on the pipe. The socket welding flange is similar to a slip-on flange except it has a bore and a counterbore dimension.
The counterbore is slightly larger than the O.D. of the matching pipe, allowing the pipe to be inserted into the flange similar to a slip-on flange.
The diamter of the smaller bore is the same as the I.D. of the matchine pipe A restriction is built into the bottom of the bore which sets as a shoulder for the pipe to rest on.
Weld Flanges,Socket Weld Flanges,ANSI Socket Weld Flanges,Steel Socket Weld Flanges
Shandong Zhongnuo Heavy Industry Co.,Ltd. , https://www.zhongnuoflange.com