Need a continuous length of 40 ft (approx) is this doable. Can this be spliced? Tks
In my experience it is rare to buy a roll of 50 to 100 feet of surgical tubing that has no splices to start with. I am used to seeing one or two. The splices are typically small barbed plastic end to end couplers. The short answer is that, yes. It can certainly be spliced in the same way.
The long answer in the context of diving, I would avoid splices. As a recreational dive instructor and a cave diver, I look for potential points of failure and try to minimize them. I know that is not always easy. I would also be very careful about joining surgical tubing with a knot. Because of it's highly elastic nature, surgical tubing has a tendency to work loose when tension is repeatedly applied and released. Some really good and string knots simply don't work well with surgical tubing. I have used zip ties successfully, for example when making surgical tubing loops to secure gear. Zip ties can be used in essentially the same fashion as you would use cable clamps to form a loop in the end of a piece of steel cable.
Without knowing what 40 feet of tubing would actually be used for that is probably the best answer I can come up with.
We have used this material before but our application required short lengths. If you use in in long lengths you will need to provide a support for it, a trough for it to lay in. It can be spliced with a connector that has a nipple on both ends. The tubing just pushes on to the nipple, no glue is required. You don;t mention how much pressure will be in the tube or if it's gas or liquid. We used the tubing for air and it worked well for that. It is a somewhat stretchy but I don;t recommend stretching it in the installation. Just let it lay at its natural position.