One of the features of a Witt Lining Systems drop in PVC tank liner is that the welds used to fabricate the liner are a continuous or homogenous weld. Although the weld starts out as an overlap of two adjoining PVC sheets, the use of dielectric radio frequency welders results in a finished, monolithic, single thickness joint. Even if you cut through a weld sample to look at it from the edge other than the mark of the welding bar there is no difference between where the overlap once was and the untouched area of the sheet on either side of the weld. The properties of the sheeting material on our liners is maintained throughout the weld as well.
It is this type of weld that makes a Witt drop in tank liner unlike other bonded or rigid lining systems. Lining systems that involve bonding material to the substrate require a welding strip to be applied to the abutting seams. These welds are made by fusing just a few mils of each surface layer to each other. Clearly the seam section of a bonded liner does not have the same mechanical properties of the rest of the sheeting. With rigid lining systems, sheets are welded together with a weld rod and again just a few mils of each surface layer are holding the joint together. The weld rod itself often contains different mechanical and chemical resistance properties than the sheet itself.
The benefit to you, as a user of a Witt Lining Systems tank liner, is that you can have the highest quality weld seams available in the industry and still do the installation with your own in house personal. Even the smallest tank liner requires skilled technicians to install a bonded or rigid lining system but with a Witt liner that work is already done for you. Simply drop the liner in your tank and you are done.