long run seawater hose

Hi all,

I have a sea chest aboard my boat and I'd like to use it to supply seawater to a head located about 30 feet away. It's an electric head and I was planning on installing a vented loop close to the sea chest and the seawater pump right after that. Is this feasible or should I instead install another sea cock closer to the head? (I'm trying to avoid unnecessary holes in the boat.)

If it is feasible what kind of hose or pipe would you recommend? I was thinking a hard pipe might be better (with a flexible hose where it passes through a bulkhead and where it attaches to the pump and the head.)

I'd also like to supply seawater to a foot pump in my galley. Could I use the same intake to supply that pump? I was thinking to install a no return check valve close to the head to avoid any cross contamination. Or should I use a completely separate line?

Thanks in advance for your advice!

 

Pex grade A or Uponor

I prefer working with Pex on brass fittings, but Uponor on plastic is better for corrosion concerns. Uponor is so much harder to use and really requires better and costlier tools for a small run like yours and always a concern for small spaces for all, so think ahead..

 

I've done some fairly long runs but nothing 30 feet. We have an inordinate amount of hull perforation with our chilling equipment, deck washdown pumps as well as house systems. On my last boat we did some consolidation on a retrofit. Found that upsizing on the common feed line allowed us to have two relatively high use pumps simultaneously with minimal issue. We had initially tried check valves but they rather quickly had issues, we swapped to swing gate check valves but even those had occasional issues sticking and we found that a 2 inch pipe feeds a 1.5 inch deck hose and a 3/4 inch deck hose just fine.

I use a Trident wire reinforced hose, it's not cheap but for below water line applications we get life spans measured in decades. Issue would be on a 30 foot run its liable to cost more than a seacock and thru hull.