If you are using plastic tanks, it is most likely to store some sort of dangerous chemical. It can range from simple gasoline to a highly corrosive and/or flammable material. Obviously, the tanks are not something you want to leave unrepaired, so if you need plastic welding repairs, then this is what you need to consider:
What Kind of Tank You Have
There is a vast amount of different types of tanks, each with varying uses. You might have chemical storage tanks, freestanding batch or process tanks, dye tanks, triple rinse tanks, anodizing tanks, pre-flux tanks, or any one of several others. It all depends on the chemicals you have in them, and what you need them for. It is also entirely possible you have several different needs, and will need different tanks for each of the chemicals you use.
What Parts Your Tank Needs
Obviously, different tanks use different parts, and you need to ensure that you are buying and using the correct parts for them. A well-trained and educated staff can ensure your tanks are fitted with everything they need, and they should offer continued support and maintenance. Look for the company with a dedicated staff that can offer you 24/7 emergency repair services.
What Tank You Need
Your needs boil down to your wishes, so whatever it is you wish to store in your plastic tanks is entirely up to you. Therefore, it is possible you will need a custom tank. If so, when you choose a company to outfit and repair your tanks, inquire if they do custom tank builds, since not everyone does. If they do, then ensure they are able to design a tank for your exact needs. A reliable company will not only be able to do this, but their tanks will also be resistant to chemicals and not corrode. It would also be beneficial if they offer steel fabrication services and hot dip galvanizing assistance.