Selection of outlet flow rate for reciprocating pumps
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Dear experts, what type of flow meter is suitable for use at the outlet of a reciprocating pump? Taking water as an example, the main issue is that the flow rate fluctuates significantly at present. Thank you
Uneven flow is a major drawback of reciprocating pumps. Generally, the following two methods are used to improve the uniformity of flow rate in pipelines. 1. Use of multi-cylinder reciprocating pumps By utilizing multi-cylinder reciprocating pumps, the movements of the pistons in each cylinder are spaced by a certain phase difference; the total volume of fluid delivered is equal to the sum of the volumes delivered by each cylinder. This superposition can improve the unevenness of the flow rate in reciprocating pumps. 2. Install the air chamber Install the air chamber at the beginning of the extrusion pipeline. The air chamber can act as a buffer for liquid flow.
Thank you. Changing the pump is unlikely; adding a buffer is something that could be considered. If I replace the gauge, which one would you recommend?
Please tell me the reciprocating frequency of your pump; our products are capable of measuring pulsating flow, and in cases where the pulsation is rapid, no buffer is required.
It is recommended to use vortex flow meters or differential pressure orifice plates; they should be placed as far away as possible from the pump outlet. If there are significant fluctuations in that area, a buffering device can be installed if conditions permit
The main issue to address is flow rate fluctuations. Firstly, flow meters are not suitable for operating in pulsating flows, as their accuracy is poor in such conditions. Secondly, even if the flow rate can be measured, an ever-changing value doesn’t serve any practical purpose. Therefore, a flow damper should be installed at the pump outlet, and the flow meter should be placed as far away from the pump outlet as possible.
Electromagnetic is recommended. If it’s possible to reduce pulsation, orifice plates, electromagnets can be used, and even vortex flow meters can work as well.
A pulse damper can be installed on conventional reciprocating pumps, and an electromagnetic flowmeter can be considered for flow measurement