Tips for Weir Plate Maintenance

Every flow measurement device, including a weir plate, needs maintenance from time to time to make sure that it functions correctly. A variety of issues can affect the performance of a flow management device, and if you don’t address these issues, taking accurate measurements you need will be very difficult. Here are some simple tips for weir plate maintenance that will help you make sure that your device will last for years to come. 

1. Upstream Channel Maintenance

If you want your weir plate to work correctly, you first need to ensure that the upstream quality possesses the right characteristics. First, the channel must be straight as curves and dips can affect the flow profile. Upstream of the weir, there should also be a cross-section that is at least 15 times what you expect the maximum head to be.

The flow entering the portable weir should be subcritical and should be distributed evenly across the upstream channel. You also need to make sure that the upstream channel, as well as the weir pool, is free of debris such as plant growth. In the weir pool, debris can raise the pool’s floor and in the upstream channel, it can alter flow characteristics. 

2. Weir Maintenance

After you’re finished working on the upstream channel, you can move on to the weir itself. Weir plate maintenance mostly involves making sure that the weir is still positioned correctly. The weir crest should be level, in the center of your flow stream, and positioned two times the maximum head level above the floor of the weir pool.

You will also need to check the weir crest for signs of damage. If there is any debris blocking the weir crest, you should remove it, and you also need to look for rust, nicks or any other types of damage that might prevent flow from spilling freely. Lastly, look at the banks of the channel around the weir plate to make sure that flow is not bypassing your device. 

3. Downstream Channel

Examining the channel downstream of your weir plate is the last step of proper maintenance. Your first goal should be to look for any signs that submergence is occurring. When this happens, it will force your operators to adjust their flow equations, which makes taking accurate readings harder.

Next, you should carefully inspect the channel for warning signs of scouring, which is a wearing away of the downstream that can displace your weir plate. If you see any scouring, you’ll need to reinforce your channel to keep your device in place. Finally, clean the channel of debris so that flow can move through the channel unimpeded. 

Find Your Flow Device

As you can see, weir plate maintenance isn’t all that difficult as long as you follow the right steps. If you need a new flow device for your system, Tracom FRP is your go-to resource. We are proud to offer our customers a huge catalog of fiberglass products, including flow management devices and protective tools such as sun shades and equipment shelters. Contact Tracom today so that we can provide you with a quote for whichever product you’re interested in.