Rob
Forum Moderator
and I've removed the Whatsup number. Normally I'd also remove the email address, but will leave you two to discuss on the condition that you report back in the thread what's decided. Let me know when you've emailed and I'll delete that too.
As a comment on the block of text, it doesn't mention if the pressure loss was measured for a moving free surface or a (non)wetted pipe. I can't see a diameter either to see if it's surface tension, gravity or forced flow driven.