Chemical plant commonly used pump selection list

Typical chemical pumps in daily chemical production process include: feed pump, reflux pump, bottom pump, circulation pump, process pump, injection pump, supply pump, flush pump, sewage pump, fuel pump, lubricant pump and liquid seal pump Etc. Characteristics and Selection Requirements See the table below: Characteristics and Selection Requirements of Typical Chemical Pumps Pump Name Features Selection Requirements Feed Pump (including Feed Pump and Intermediate Feed Pump) 1. Stable flow rate 2. Higher general lift 3. Some Raw material viscosity or solid particles 4. Pump inlet temperature is generally room temperature, but some of the intermediate feed pump inlet temperature can be greater than 100 ℃ 5. Work can not stop 1. Centrifugal pump is generally selected 2. High lift , Consider positive displacement pump or high-speed pump 3. Pump backup rate of 100% Return pump (including the top, middle and bottom of the return pump) 1. Flow range, lift low 2. Pump inlet temperature is not high , Generally 30 ~ 60 ℃ 3. High reliability of work 1. Centrifugal pump is generally used 2. Pump standby rate of 50% to 100% Bottom pump 1. Flow range of changes (general use Liquid level control flow) 2. Large flow 3. Pump inlet temperature is higher, generally greater than 100 ℃ 4. Liquid generally in the gas-liquid two-phase 5. High reliability of the work 6. Harsh conditions, the general precipitation of dirt 1 Commonly used centrifugal pump 2 selection of low cavitation allowance pump, and the necessary perfusion head 3 pump standby rate of 100% circulating pump 1 flow stability, lower head 2 a wide range of media 1. Selection of centrifugal pump 2. Press the media selection of pump models and materials 3. Pump backup rate of 50% to 100% Product pump 1. Flow smaller 2. Lower head 3. Pump inlet temperature is low (overhead products are generally room temperature, the middle out And the bottom product temperature slightly higher) 4. Some products intermittent pump operation 1. Should use a single-stage centrifugal pump 2. For high purity or precious products, requiring a reliable seal, the pump standby rate of 100%, for general products, spare Rate of 50% to 100%. For intermittent operation of the product pump, the pump is generally not equipped with a pump 1. Flow is very small, strict measurement requirements 2. Working at room temperature 3. High discharge pressure 4. Injection of chemicals for the medium, often corrosive 1. Selection column Plug or diaphragm metering pump 2. For corrosive media, the pump overcurrent element is usually corrosion-resistant materials 3. General intermittent operation, not equipment Pump sewage pump 1. Flow smaller, lower lift 2. There are often sewage Corrosive media and abrasive particles 3. Continuous flow control requirements of the traffic 1. Selection of sewage pumps, slurry pump 2. Often require the use of corrosion-resistant materials 3. Pump standby rate of 50% to 100% Fuel pump 1. Flow smaller , The pump outlet pressure is stable (generally 1.0 ~ 1.2MPa) 2. High viscosity 3. Pump inlet temperature is generally not high 1. Depending on the viscosity, the rotor pump and centrifugal pump can be used 2. Pump standby rate of 100% lubrication Pump and seal pump 1. Lubricating oil pressure is generally 0.1 ~ 0.2MPa 2. The mechanical seal seal liquid pressure is generally higher than the sealed chamber pressure 0.05 ~ 0.15MPa 1. Generally with the host Supporting the supply 2. General for the screw pump and gear pump, but the large-scale centrifugal compressor group often use centrifugal pumps

Brinell Hardness Tester

Brinell hardness tester is a precision measuring instrument for measuring brinell hardness of metals .
Brinell hardness tester is mainly used for cast iron, steel, non-ferrous metals and the degree of hardness measurement of the soft material such as alloy, brinell hardness test is one of the largest dimple all Hardness Testing method, it can reflect the comprehensive performance of materials, from the sample organization microsegregation and composition is not uniform, so it is a kind of hardness test method with higher accuracy.

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