How to determine the model of plunger pump selection
In the previous article, we introduced the basic principles of plunger pump selection, then we must consider how to choose the appropriate model and parameters according to our own needs. Specifically, it should be considered from five aspects according to the process flow, pump type basis, water supply and drainage requirements, etc .: body delivery volume, device head, liquid properties, pipeline layout and operating conditions, which are related to the production capacity and delivery of the entire device ability.
For example, in the process design of the design institute, the normal, small and large pump flow rates can be calculated. When the plunger pump manufacturer chooses the pump,
1. Flow rate is one of the important performance data for pump selection. Based on the large flow rate, taking into account the normal flow rate, when there is no large flow rate, usually 1.1 times the normal flow rate can be taken as the large flow rate. Generally, it is necessary to enlarge the 5% and 10% margin to select the type.
2. The head required by the installation system is another important performance data for pump selection. Including the name of the liquid medium, the nature of the liquid. Physical properties, chemical properties and other properties, physical properties are temperature c density d viscosity u solid particle diameter and gas content in the medium, etc. This relates to the system head, effective cavitation allowance calculation and suitable pump type: chemical properties , Mainly refers to the chemical corrosiveness and toxicity of the liquid medium, which is an important basis for selecting the pump information and the type of shaft seal.
3. The piping layout conditions of the device system refer to the liquid delivery height and the liquid delivery distance. Some data such as the high liquid level on the discharge side and the specifications of the pipeline and its length, data, pipe specifications, quantity, etc., are provided for the calculation of the system head and the check of the cavitation allowance.
Such as the operation of the liquid T saturated steam power P suction side pressure PS) the discharge side container pressure PZ altitude, ambient temperature operation is intermittent or continuous pump position is fixed or removable 5 operating conditions are a lot of content.