Limitations of Weir Boxes to Keep in Mind

When you’re looking for a primary flow management device, there are several different options that you can choose, including a weir box. Weir boxes have several strengths and, when used correctly, can make it easier for your operators to take accurate flow readings.

That being said, weir boxes also have some limitations that you should keep in mind. Like most flow management devices, weir boxes aren’t suitable for all applications, which means installing one of these devices isn’t always the best choice. Here are a few weir box disadvantages that you should consider before you invest in a flow management device.

Connecting to a Pressurized Pipe

If you’re thinking about installing your weir box in an industrial application, it likely means that you’ll need to connect your device to a pipe with pressurized flow. While this is possible, certain conditions must be met to make sure that your weir box functions the right way.

To ensure accurate readings, the flow entering your weir box must be at the correct velocity, as with all flow management devices. When the flow in your system is pressurized, you’ll need to add a flow conditioning accessory to your weir box. Some options include an energy absorber, flow straightener or baffle plate.

Added expense is the reason that this is a disadvantage. If you want to save as much money as possible on your flow management device, using a weir box to measure flow from a pressurized pipe may not be the best choice.

Vulnerability to Debris

Being vulnerable to debris is another of the biggest weir box disadvantages. Weir boxes work their best in applications where the flow is free from floating debris. In applications where these issues are possible, your weir box may not function the way that you need.

There are two reasons that weir boxes are vulnerable to debris. First, when there is solid debris in the flow, it can result in sedimentation in the weir pool, which will raise its depth and impact the accuracy of your readings. Second, for a weir to function correctly, the crest of the weir must remain clear so that free spilling is possible. Floating debris has the potential to attach to the crest, which would block the flow.

Need to Avoid Certain Temperatures

Weir boxes are also limited in that they can only be used in certain temperatures. Unless you are able to add external heating to the weir pool, it is not possible to use a weir box in freezing temperatures. Weir boxes may also have problems in extremely hot climates. So, if extreme temperatures are common in the location where you need to install a flow management device, something other than a weir box may be necessary.

Now that you know about some of the most common weir box disadvantages, you should be able to decide if this device is right for your system, and if you’re ready to purchase a weir box, Tracom, FRP is here for you. We specialize in producing fiberglass flow products such as weir boxes, and our team would be glad to help you decide what style of device matches your flow management needs. Contact Tracom today to request a quote.

Tracom News

More Resources!

Wastewater Management Device News

Your Guide to Fiberglass Control Panel Consoles

Control panels are essential to every single aspect of wastewater management and water treatment facilities. These are areas where your control and monitoring instruments, equipment ...
Read More →
Wastewater Management Device News

Your Guide for H Flume Installation

H flumes are some of the most versatile open channel flow tools, providing the consistently accurate readings that your operation needs. One of the benefits ...
Read More →