Originally Posted by tayana55
I thought 800 psi was working pressure for 1/2" copper, cupro nickel has higher working pressure for the same size tube.
What size nylon did you use and what was the run length ?
to cylinder on my boat is around 30 feet including bends, which brand of tube did you use and what does it perform like under heavy weather
I used 3/8" tubing from Parker Hannifin. I believe the total run on my boat is close to 90' (catamaran with hydraulic tie-bar and autopilot). If I recall, the manufacturer of my system, Ultraflex, recommended nylon for runs of up to 100'. If there is any squish in the helm it is not noticeable. We have run in force 9 conditions under autopilot
with no issues. I imagine any softness in the helm due to the tubing expanding under pressure is more theoretical than practical. Most of the time the tubing is not seeing anywhere near the pressures for which it is rated.
Nylon tubing has several important advantages. It is cheap
and light enough that I carry an extra 50' roll in case of emergency
. It is very easy to work with and does not require tubing benders and flaring tools. Installation
is very easy, even if you have lots of sharp bends as I did. I installed ours in an afternoon. I inspect it regularly and have found no signs of chafe or wear, but if a section did chafe through I could repair it in minutes with fittings that I got at the local hardware