There are a couple different reasons why there would be a need for a custom liner installation...
Large Multi-piece Liner Installations
John Terry Sales has significant experience with installing liners in the field. Your standard containment liner that's prefabricated to the finished size (i.e. 150' x 200') isn't going to require a custom installation, they can be installed without much trouble with equipment and a work crew. Although, sometimes the area needing to be lined is too large and a single liner can't be pre-fabricated to the required size (it would be too big to handle), in that situation, we'd need to build 2 or more liners and weld the edge(s) together on-site to create one large liner. Field welding is essentially done the same as would be done in the plant but is instead done on location. There would be additional charges for welding on location but sometimes it's necessary to have it done.
Another case requiring field installation is when using HDPE (High Density Polyethylene). HDPE containment liners cannot be pre-fabricated because the HDPE is a stiff rigid material. This is a strength of HDPE and makes it more puncture resistant but if it were folded for shipment, the folds would create irreversible weak-spots in the material because it would be stretched beyond its yield point.
During installation, in order to ensure a fully sealed liner, every welded seam is tested to make sure there are no leaks. This is how we do it, each seam actually consists of two welds in parallel with a small gap between them. After the weld is completed, both ends of the seam are sealed off and the gap between is pressurized until it can hold high pressure without fluctuation. In addition to that, another test is done on all junction points where two or more seams come together, but this test is done with equipment that covers the junction and is a vacuum test to ensure there are no leaks. After the installation, all the seam and junction tests are recorded and given to the customer as a record of completion.
There are a couple of things to consider if you're thinking about an HDPE installation. There's usually going to be more cost to use HDPE unless the size is too large to consider a prefabricated liner of LLDPE. Also, HDPE needs to be put together on site over multiple days or weeks which means weather can play a role in holding up or completely stopping work leaving the installation crew waiting around or scheduling to come back after weather is cleared. This can be alleviated by planning and watching the weather reports but it's hard with an installation spanning over weeks. Having said that, it's satisfying to have a completed HDPE lined pit that you know will last for a very long time.
Get In Touch With Us About Your Project
Whether you're interested in receiveing a quote on a containment liner installation project or just looking to get a rough estimate for a budget, all you need to do is give us a call or send us an email. Things that are helpful for us to know are the dimensions of the area to be lined, the depth and slopes if it's a pit, the materials you're considering, or the length of time you'd like the liner to last. If you know exactly what you need or have engineered drawings, great! Or if you aren't sure and would like to discuss it, give us a call either way. We'll be happy to help!