The drive pipe is a very important part of the Hydram and it should be laid straight with an even fall from the feed well to the Hydram. Please see here for more information on drive pipe layouts.
We strongly recommend the use of heavy wall steel tube for the drive pipe. Up to 150mm bore is available in 7 metre lengths of galvanised steel tube, screw and socketed, to BS 1387. Hydrams up to size 3 have a threaded body to take his pipe directly. For larger Hydrams, please contact Allspeeds.
Plastic drive pipes may be used in certain limited circumstances e.g. for small Hydrams where the fall and lift are low but please consult us first as a plastic drive pipe is likely to cause the Hydram to not work.
The length of the drive pipe is also important and as a general rule for falls greater than 2 metres, it should be between 3.5x and 5x the fall. For a fall of 10m, the length should be between 35m minimum and 50m maximum. For falls of 2m or less, the drive pipe should be made less than 7m long (i.e. one length of pipe).
The following are the standard sizes of drive pipe for each Hydram. Do not deviate from these sizes without first contacting Allspeeds.