Free Draining

Hello everyone,
If there is a free draining requirement, does it mean it has to be sloping? I have dealt with this before and based from my memory, a free drain does not necessarily mean sloping. A horizontal line can be free draining as long as there is no pocket.

Thanks in advance.

I also agree, the line need not be sloped, BUT it could be. The term "free draining" means it's an open drain (vented), and not a pressurized drain.

Thank you JOP & 11echo!

If there is a direction for the free draining, does it mean we have to slope down to that direction? I just want to keep it simple and follow the P&ID. I know it doesn't hurt to slope the line but during fabrication a lot of things can go wrong when fabricating a sloped line. Some people want to do extra by specifying to slope the line even when the P&ID does not require us to slope it.

When you have any drain line you want the "commodity" to go to someplace, sloping the line just helps that process. Actually if you'll look in the training forum here there is a article on "under ground piping plans" ...it touches on all this, I suggest you give it a look.