Regarding the selection and reuse of flowmeters, what determines whether the flowmeters in existing plants can be reused for renovation and expansion projects?
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This post was last edited by 328104062 on 2016-6-21 at 11:18. As the title suggests: In the current expansion project, it is intended to reuse a set of instruments (their location of use and explosion protection ratings meet the requirements; it’s just that the facility is being expanded). 1. When selecting instruments, what parameters does the process engineering team need to provide to the instrumentation/control engineering team? 2.4.3.2 Conditions for the monitoring section: 1) Objects to be monitored: components of the medium, physical properties, operating state (gas/liquid), operating conditions (temperature and pressure), as well as monitoring parameters (temperature, pressure, liquid level, flow rate, etc.). 2) Monitoring locations: on-site, near the equipment, in the control room, and in the computer center. 3) Purposes of monitoring: indication, recording, accumulation, control, alarm generation, and interlocking functions. 2. For expansion projects, can flow meters (such as mass flow meters) be reused? What calculations are required for this? What factors determine whether it is possible to make use of existing assets? Things like pressure drop, accuracy (depending on what), range, transmitter differential pressure range (orifice plate) – what else? Please talk about the various types of instruments you know, thank you!
The conditions to be checked also include the design temperature and design pressure, as well as the local climate conditions, to ensure that the instrument is not damaged under extreme conditions. Regarding the reuse of flowmeters, it is generally possible to seek assistance from the corresponding manufacturer for calculations; any calculations done by oneself can only serve as a reference, and the manufacturer’s calculations must take precedence.
Which parameters should be calculated as a basis for determining whether benefits can be realized? ? ?
It depends on the type, but usually the performance curves are examined to see whether the pressure loss and other parameters meet the process requirements. As for other factors such as β and Reynolds number, if they are not appropriate, the software will generally report an error.
Taking orifice plates as an example of flow meters: temperature, pressure, composition of the fluid, the range for which the flow meter is designed, the flow rate and range ratio after expansion, the range of the differential pressure transmitter, and the pressure loss generated
When expanding the capacity of a device, it is generally not possible to reuse existing flowmeters; unlike measuring instruments for pressure, temperature, etc., whose values usually do not change much. Expansion often implies an increase in flow rate, and flowmeters can be reused as long as they remain within their measurement range; otherwise, they cannot be used. Generally, flow meter manufacturers can evaluate whether a flow meter can be reused by considering parameters such as the typical flow rate and maximum flow rate used in the process.
Each type of flow meter is suitable for different operating conditions, which makes the scope of discussion too broad. It would be better to specify which flow meters can be reused and provide the corresponding process conditions, so that it’s easier to discuss the matter.
For a flow meter to be reused, first, its various parameters must meet the requirements for measurement; secondly, it must be calibrated to ensure that its accuracy and stability satisfy the needs of production.
The other instruments are not very clear; the mass flow meter is fine. The main thing that needs to be determined is whether the flow range is appropriate； Is the pressure loss acceptable ； As for whether the power supply and signal components are suitable or not, there is actually a very convenient approach: have a technician select products based on the new operating conditions, and then check whether the models of those selected products are similar to those of your existing products – just make a comparison item by item.