SAILTEC's Forespar Katalog 2015 - page 38

36
MARELON MARINE PLUMBING
TYPICAL HEAD
COCKPIT DRAIN
NOTE: IF A THRU-HULL IS TO BE INSTALLED LESS THAN
6”(152.4mm) ABOVE WATERLINE, A BALL-VALVE OR
SEACOCK MUST ALSO BE USED.
SINK DRAIN
Pump Out Deck Fill
Vent
1-1/2”
(38.1mm)
Overboard
Discharge
3/4”
(19.05mm)
Intake
AT LEAST 10”(254MM)
ABOVE WATERLINE
1-1/2”
(38.1mm)
Y-Valve
1-1/2”
(38.1mm)
Vented
Loop
Marine Head
Holding Tank
Thru-Hull
Tailpipe
Ball-Valve
Sink
Flush Head
Cockpit Drain
Industrial vs Marine
Industrial or household fittings typically use the NPT (National Pipe Tapered) tapered
thread. The marine valves, thru-hulls, tailpipes and seacocks used in boats employ the
NPSM (National Pipe Straight Mechanical) parallel thread form. Tapered industrial fittings
are not intended to be joined with parallel marine fittings.
Marelon® Valves and Fittings
Almost all Marelon® valves, thru-hulls and fittings use NPSM parallel thread forms that
require thread compound or Teflon® tape to seal. There are two exceptions to using
parallel threads in Marelon®. Our Marelon® “93 Series” plumbing system comes
standard with buttress threaded thru-hulls that mate to buttress threaded valves. And
our Marelon® “HC Series” line of reducing tailpipes all employ true NPT tapered threads.
British vs United States Parallel Thread Standards
The American NPSM parallel thread standard has a thread flank angle of 60˚. The British
Standard Pipe, or BSP standard for parallel threads has a thread flank angle of 55˚.
Identification can also be made by inspecting the root and crest of the threads. The
truncation of the root and crest of American standard threads are flat. The truncation of
55˚
60˚
BRITISH BSP
N.P.S.M.
AMERICAN N.P.S.M.
A WORD ON THREAD FORMS
TYPICAL INSTALLATIONS
Taper to Straight
Mismatch
The temperature range of Marelon® is:
-40˚ F to +176˚ F or -40˚ C to +80˚ C
LIMITED WARRANTY
Forespar
®
accepts no responsibility for valve
or thru-hull components which are improperly
installed, tampered with or have inadequate
MARELON
®
MARINE PLUMBING
For Use Above And Below Waterline
Compatible With Traditional Bronze Fittings
Precision Molded Plumbing Systems
Complete Freedom From Corrosion
U.L. Approved & ISO Certified
A.B.Y.C. Compliant
Marelon
®
is the modern material for marine plumbing
systems. Its non-corrosive proprietary formulation of
polymer composite compounds uses a resins and additives
to produce a superior marine-grade product that will not
deteriorate like traditional bronze marine plumbing parts.
COMPOSITE, NON-CORROSIVE MARINE PLUMBING SYSTEM
Learn More
BUTTRESS
45˚
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