Specifications

orderly with valves, drains and connections readily accessible. Piping must not interfere

with bilge access.

Hose and plastic piping will be used to the greatest extent possible, as described below.

Joints in CPVC piping, where not made with unions, shall be made with compression

type fittings. Unions in polypropylene are to be made with manufacturer supplied

welding system. Where hose is used for water and exhaust lines, connections shall be

by double hose clamps with barbed ends, Aeroquip unions, or equal. Connections to

moving machinery shall be flexible and as close to the moving part as practical.

Watertight and engine room bulkhead penetrations to use NMP ROX cable and piping

transit system fittings to maintain watertight integrity and sound insulation properties.

Seacocks to be Forespar Marelon, fiberglass reinforced plastic, flush closing. Efforts will

be taken to minimize the number of through-hull fittings by combining functions.

Emergency plugs to be attached at each through-hull fitting. Through hulls are to be

labeled showing function and a clear diagram provided showing precise location

throughout the boat.

Basket strainers and strainer plates on suction sea chests are to have net area of at

least 2.5 times that of the suction pipe.

Valves to be stainless steel or ABS approved plastic valves. Maximum use of ball

valves shall be made where practical. Valves shall be labeled showing system, function

and indicating normally open or normally closed.

Check valves shall be of the ball type or spring type depending on application. Vented

loops shall be fitted on all pump raw water/bilge overboard discharge lines with an open

circuit (where able to siphon back into the bilge or piece of hardware, eg engines and

bilge lines) to prevent siphoning.

All piping shall be run in a tidy manner with due consideration given to service and

access. All black and gray water lines to have end caps on straight runs for clean-out. All

pipes are to be fully supported at regular intervals with proper pipe clamps and hangers.

All hydraulic piping shall be isolated from the hull to minimize noise transmission.

The following are suggested manufacturers for piping materials. The intent of this list is

to establish a minimum standard for piping, fittings and valves. Alternative

manufacturers complying to similar standards can be considered.

Plastic piping - Nibco Chemtrol

Plastic valves - Asahi, George Fischer, or Nibco Chemtrol

Hydraulic hose - Aeroquip or Parker

Hydraulic valves and fittings - Aeroquip or Parker

Fuel and lube oil hose - Aeroquip

Fuel and lube oil valves & fittings - Aeroquip or Worcester

Pipe clamps and handers - Stauff (stainless steel)

9.2. Piping

Piping Systems Table

Salt Water

- Pipe - Polypropylene or CPVC (schedule 80)

- Joints - Heat welded polypropylene or solvent welded CPVC

- Connections - Aluminum/plastic flanged, plastic/plastic unions