Dave Gerr - Boat Mechanical Systems Handbook-How to Design, Install, and Recognize Proper Systems in Boats

Chapter 17:Sea Suction

looking at Figure 18-3.) In practice most sail-
boats didn’t follow this particular require-
ment As of 2008, H-27 has been revised to
allow through-hulls without seacocks above
the static (level) flotation waterline provided
reinforced piping or hose that resists kinking
and collapse is used. I don’t think I’ve ever

surveyed a sailboat that fully complied with

the old version of H-27. Still, on really serious

offshore voyagers, the old H-27’s approach to

requiring seacocks to the highest heeled

waterline may have merit. ABYC H-27 now

simply requires seacocks on all through-hulls

below the waterline. My recommendationis

Figure 17-5.

Through-hull spool