Chemical centrifugal pump flow protection standards is rated flow of how many?

by:J&T     2020-06-19
Chemical centrifugal pump set in the specifications, are rated flow and standard flow, users in the selection of pump type often need according to the site, traffic need to adjust the size, then the normal rated standard flow transferred to how much is appropriate, the flow of the pump protection standard is how much? In order to ensure the safety of pump starting and normal operation, require the pump has small flow discharge, this is the small centrifugal pump flow. Work flow under 30% rated flow of pump, the pump should be set up under the low flow small flow line (for normal operation of the In the centrifugal pump discharge line and a return line) , known as the small flow line. Each type of centrifugal pump has small flow rate, lower than the flow of a centrifugal pump cavitation occurs ( There is also a big allows the work flow, between the two flow is the centrifugal pump allows the workspace) 。 1, when the flow rate under small flow pump, vibration speed will increase, in order to prevent the water pump cavitation, adjusted to open small return line, keep pump in steady state operation ( Role with compressor vibration prevention chuai line is a bit like) 2, some of the centrifugal pump can't stop the pump, such as boiler feed pump. Boilers are usually made of water pump water supply, according to the demand of different ( Lazy like winter alexi much less during the day, the wee hours) Need to adopt several pump water supply, with this small flow line, need to shut down the pump can be in in small flow loop ( Small consumed power) But I don't need to stop the pump - Irrigation water pump - Open pump operation again and again. 3, high pressure centrifugal pump pump, in order to prevent damage of pump pressure-out, before the pump to open small return line. The small flow pump protection of the small flow pump protection generally there are three ways. Respectively is: continuous circulation system design, design or design pump protection valve system control loop system. Advantages: 1, the design of control loop system selected pump could bypass flow value; Choose the bypass only in small flow condition automatically open, normally closed in order to save energy. Weakness: increase a set of control circuit of cost is too high. 2, design the loop control valve protection system advantages: since the change in the flow control valve automatic identification, automatic open and bypass circuit of the main road, fully automatic control; No other external devices or components control; Cost savings. 3 continuous circulation system, the design advantages: less investment; When there is little traffic on the process conditions, current limiting orifice plate bypass automatic first to eliminate it. Disadvantages: however much traffic, craft need to bypass line always flow through. Choose the pump should be put on the bypass flow is attached to the operation flow, otherwise easy to cause the pump output is not enough; Operation cost is higher; When the pump head high, liquid and are in a saturated temperature, current limiting plate hole may occur after gasification.
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