Several years ago, I wrote an article about drop pipe: the pipe that connects to a submersible pump and carries the well water to the well head. In that article, I focused on plastic drop pipe, both rigid PVC and semi-flexible HDPE (poly pipe), describing the pros and cons of each and the load bearing capacity of the various sizes.
The importance of the load bearing capacity of drop pipe is directly proportional to the depth of a well. The deeper the pump setting, the more important it is to pay attention to the pipe manufacturer’s recommendations as to the maximum depth allowable for the size and schedule of the drop pipe, the maximum horsepower allowable, and the type of couplings and check valves to use. Table 1 from JM Eagle shows the maximum allowable pump setting depth for schedules 80 and 120 PVC drop pipe. The other PVC drop pipe manufacturers publish similar load tables.