Different
environments, different media, different materials... It seems that it
is not so simple to choose the right chemical pump. The wrong pump can
damage the equipment at least, and cause accidents or even disasters at
worst!
Today Shuangbao will introduce to you today the knowledge about type selection based on past trade experience, hoping to be of some help to us chemical workers.
Principles of chemical pump selection:
1. Make the type and performance of the selected pump meet the
requirements of process parameters such as device flow, lift, pressure,
temperature, cavitation flow, and suction.
2. Need to meet the requirements of medium characteristics.
The requirements of medium characteristics must be met. For pumps
conveying flammable, explosive, toxic or valuable media, reliable shaft
seals or non-leakage pumps are required, such as magnetic drive pumps
(no shaft seals, isolated magnetic indirect transmission). For pumps
with corrosive media, the convection parts are required to be made of
corrosion-resistant materials, such as fluoroplastic corrosion-resistant
pumps. For pumps conveying media containing solid particles, the
convection parts are required to be made of wear-resistant materials,
and the shaft seal should be washed with clean liquid if necessary.
3. High mechanical reliability, low noise and vibration.
4. Consider the input cost of pump purchase comprehensively.
The principles, internal structures, and components of some pumps are
similar, and the biggest difference is reflected in the material
selection, workmanship and quality of the components. Different from
other products, the cost difference of pump components is very
significant, and the price gap of hundreds or thousands of times is
reflected in the performance and service life of the product.
The selection basis of chemical pumps:
The selection basis of chemical pumps should be based on the process
flow, water supply and drainage requirements, and be considered from
five aspects, namely liquid delivery volume, lift, liquid properties,
pipeline layout, and operating conditions.
1. Трафик
Flow rate is one of the important performance data of pump selection,
which is directly related to the production capacity and delivery
capacity of the whole device. For example, in the process design of the
design institute, the three flow rates of normal, small and large pumps
can be calculated. When selecting a pump, the maximum flow is taken as
the basis and the normal flow is taken into consideration. When there is
no large flow, usually 1.1 times the normal flow can be taken as the
maximum flow.
2. Глава
The head required by the installation system is another important
performance data for pump selection. Generally, the head needs to be
enlarged by 5%-10% to select the model.
3. Liquid properties
Liquid properties, including liquid medium name, physical properties,
chemical properties and other properties, physical properties include
temperature c density d, viscosity u, solid particle diameter and gas
content in the medium, etc., which relate to the head of the system,
effective cavitation Quantity calculation and suitable pump type:
chemical properties, mainly refer to the chemical corrosion and toxicity
of the liquid medium, which is an important basis for selecting pump
materials and the type of shaft seal.
4. Piping layout conditions
The pipeline layout conditions of the device system refer to the
liquid delivery height, the delivery distance, the delivery direction,
some data such as the low liquid level on the suction side, the high
liquid level on the discharge side, and the pipeline specifications and
their length, material, pipe fitting specifications, quantity, etc. In
order to carry out the calculation of the comb head and the check of
NPSH.
5. Условия на работа
There are many operating conditions, such as liquid operation T
saturated vapor pressure P, suction side pressure PS, discharge side
container pressure PZ, altitude, ambient temperature whether the
operation is intermittent or continuous, and whether the pump position
is fixed or possible.
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