Liquid ammonia flow measurement
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How is the flow rate of liquid ammonia measured, and what is the accuracy?
Could you provide more detailed information on the actual operating conditions upstairs? Liquid ammonia generally exists in a gas-liquid two-phase flow; it is easier to handle when it is in a single-phase flow, as the accuracy may decrease in the case of a two-phase flow.
Now I want to install a flow meter at the outlet of the liquid ammonia storage tank to measure the amount of liquid ammonia used
Depending on the diameter and flow rate, it can reach up to Class 0.2
We use electromagnetic flowmeters in our company. It’s okay.
Our company is currently using vortex flowmeters, and the performance in terms of process control is satisfactory
Strictly speaking, ordinary electromagnets cannot measure liquid ammonia, but they can measure ammonia water.
Our company uses vortex flowmeters of the E+H brand; we have two sets of each domestic brand, and their performance is quite good
Our unit uses mass flow meters; those of class 0.2 are too expensive. There is also a Yokogawa vortex flow meter, but it gives low readings at low flow rates.
I think a radar level gauge can be used
The MICRO MOTION mass flow meter is easy to use
You can try using a thermal mass flow meter; its accuracy is about 0.5 levels lower than that of a Coriolis meter, it offers good stability, and its price is also slightly lower
Using an electromagnetic flowmeter is a good option; at certain pressures, liquid ammonia does not vaporize, so there is no two-phase flow
Under normal circumstances, liquid ammonia has a very low conductivity, which is why it is not used in most electromagnetic flowmeters; only the electromagnetic flowmeters manufactured by a few large companies are capable of measuring media with extremely low conductivity. Overall, it is not recommended.