New to site, but I did try to search for an answer without success.

Question is, how much clearance do you need between the DH pump and the casing?

Little background, it is plastic 6" for 60' and coupled to 4" plastic to 130'. I have a 3" submersible pump that would like to run deeper than 60'. Water table has been +- 30', but that fluctuates during the dry season here in the southern Philippines.

Any help would be appreciated.