When it comes to accurate flow management and measurement, there is no more versatile tool than the Parshall flume. However, as you probably know, there are several factors you need to consider when installing your flume to make sure it operates correctly, including the upstream conditions in your system.
If you’ve never installed a Parshall flume before, or if you’re installing a new flume in your system and need a refresher, it’s a good idea to learn a little about proper upstream conditions and how they can be maintained. Here are a few tips for guaranteeing proper Parshall flume upstream conditions so that you can be sure that this tool is functioning the way that you need.
Tranquil and Sub-Critical
When you’re trying to make sure that the Parshall flume upstream conditions in your system are correct, it’s important to spend some time thinking about your flow.
As you might be aware, the flow entering your flume needs to be tranquil, which means that it is free from turbulence. The best way to ensure tranquil flow is by making sure that the channel entering your flume is smooth and long enough to allow your flow to be properly developed.
You also need to be sure that the flow entering your flume is sub-critical. The reason for this is that Parshall flumes accelerate the flow to super-critical levels, and if the flow entering the flume is subcritical, your readings will be impacted. If necessary, you can install a flow conditioner to ensure the proper velocity of your flow.
Another factor to consider when examining upstream conditions in your system is whether or not the flow is evenly distributed in your channel. If the flow is not evenly distributed, it will not enter your flume correctly, making it virtually impossible for you to take the accurate readings on which your operation relies.
Carefully examine the flow in your channel, paying special attention to how it is distributed. If it is uneven, you may need to make adjustments.
Guiding Your Flow
As you can probably see, maintaining the right upstream conditions is crucial in making sure that flow in your system correctly enters your flume. While we’ve covered some of the most important factors related to upstream conditions, there are a few issues left to discuss.
First, there can be no bends in the channel as it approaches your flume. Any bends or turns can impact flow velocity, possibly preventing it from entering your flume at the optimal sub-critical state. Finally, to make sure your flume captures the flow, you will need to install wing walls to direct the flow from your channel into your flume.
Find Your Parshall Flume
As long as you’re careful about maintaining the right Parshall flume upstream conditions, you should be able to reap the benefits of this dependable device. Find the right Parshall flume for your operation by checking out the product inventory at Tracom, FRP.
Tracom offers a range of flume styles, including the popular Parshall flume. Our products are made of fiberglass, meaning they’re guaranteed to last for years to come. Contact us today for more information.