Installing Seacocks - Follow Up Info !!

[Tom S]

Duh. I don't know what I was thinking when I said 60 lbs

You are right they are no more than 10-15lbs usually.Its funny because I do know about the problems on some handles of the Marelon seacocks, but I once had an extra Marelon Thru-Hull and just for the heck of it I tested it by wacking it with a small sledge hammer while I rested it on a metal vice and I recall that I was pretty darn impressed. I think the only damage I saw was some nicks on the threads, thats all.

 

[Tom S]

Duh. I don't know what I was thinking when I said 60 lbs

You are right they are no more than 10-15lbs usually.Its funny because I do know about the problems on some handles of the Marelon seacocks, but I once had an extra Marelon Thru-Hull and just for the heck of it I tested it by wacking it with a small sledge hammer while I rested it on a metal vice and I recall that I was pretty darn impressed. I think the only damage I saw was some nicks on the threads, thats all.

 

[Ross]

Nice caliper !! I'll bet that it is easier to break a threaded thru hull than a

. Notch sensitivity is kind of a peculiar characteristic of some metals. If you score sheet aluminum with a sharp knife it will break or tear along that scratch. Low alloy steel doesn't much care. Consider how often we have hack sawed part way through a piece and then just bent it to break it off. Brass is particularly subject to this and some bronzes are very tolerant. If you work with aluminum wire just a knife cut in the wire can cause it to break where a copper conductor takes no notice.

 

[Ross]

Nice caliper !! I'll bet that it is easier to break a threaded thru hull than a

. Notch sensitivity is kind of a peculiar characteristic of some metals. If you score sheet aluminum with a sharp knife it will break or tear along that scratch. Low alloy steel doesn't much care. Consider how often we have hack sawed part way through a piece and then just bent it to break it off. Brass is particularly subject to this and some bronzes are very tolerant. If you work with aluminum wire just a knife cut in the wire can cause it to break where a copper conductor takes no notice.

 

[Ralph Johnstone]

Unfortunately ..........................................

.............. your research has also given most, if not all of us, good reason for sleepless nights.I think it safe to say that Hunter, at the very least, has delivered all of their sailboats over the last twenty years with NPS thru-hulls threaded into NPT ball valves.That being the case, I think we can say that pretty well 98%+ of all sailboats have this problem. I just never realized how bad an NPS looked jammed into an NPT. And when you consider the remaining wall thickness is 1.54 mm (0.070"), I was probably getting way too much sleep anyway.I see a BIIIIIIIIIG overhaul coming up in the near future on our 1999 H310.Best regards,s/v Island Hunter

 

[Ralph Johnstone]

Unfortunately ..........................................

.............. your research has also given most, if not all of us, good reason for sleepless nights.I think it safe to say that Hunter, at the very least, has delivered all of their sailboats over the last twenty years with NPS thru-hulls threaded into NPT ball valves.That being the case, I think we can say that pretty well 98%+ of all sailboats have this problem. I just never realized how bad an NPS looked jammed into an NPT. And when you consider the remaining wall thickness is 1.54 mm (0.070"), I was probably getting way too much sleep anyway.I see a BIIIIIIIIIG overhaul coming up in the near future on our 1999 H310.Best regards,s/v Island Hunter

 

[Maine Sail]

Sorry Ralph

Sorry Ralph...! Sleep is over rated any way. Right???

 

[Maine Sail]

Sorry Ralph

Sorry Ralph...! Sleep is over rated any way. Right???

 

[Ross]

Ralph, at the risk of further disturbing your sleep,

1mm = .0394 inches therefore 1.54 mm=0.0606 inches. ;D. Just don't let you big clumsey cousin start kicking things.

 

[Ross]

Ralph, at the risk of further disturbing your sleep,

1mm = .0394 inches therefore 1.54 mm=0.0606 inches. ;D. Just don't let you big clumsey cousin start kicking things.

 

[Maine Sail]

Ralph..

Ralph,Quote:"I think it safe to say that Hunter, at the very least, has delivered all of their sailboats over the last twenty years with NPS thru-hulls threaded into NPT ball valves."Let's not throw Hunter under the bus just yet. They may have been using "combination thread" thru-hulls which can be special ordered especially for an OEM the size of Hunter. Of course it still does not change the strength factor...

 

[Maine Sail]

Ralph..

Ralph,Quote:"I think it safe to say that Hunter, at the very least, has delivered all of their sailboats over the last twenty years with NPS thru-hulls threaded into NPT ball valves."Let's not throw Hunter under the bus just yet. They may have been using "combination thread" thru-hulls which can be special ordered especially for an OEM the size of Hunter. Of course it still does not change the strength factor...

 

[Ross]

Mainesail , on the woodenboat forum there is often

a discussion about copper rivets and roves. I think that pennys are cheaper than roves. Just have to find a way to hold the little buggers when we drill them. Just a bit shy of 1/16 inch.

 

[Ross]

Mainesail , on the woodenboat forum there is often

a discussion about copper rivets and roves. I think that pennys are cheaper than roves. Just have to find a way to hold the little buggers when we drill them. Just a bit shy of 1/16 inch.

 

[Stillraining]

Yep

Titainium is looking better all the time.

 

[Stillraining]

Yep

Titainium is looking better all the time.

 

[Ross]

Stillraining, allwet, mossy, swampthing,

have I covered it all yet.;D Just kidding. Bronze has a 5000 year track record. I think I will stick with that. I lived for a year and a half in eastern Oregon. Got real happy with 12 inches of rain each year. Didn't rain much here for July, August and most of September. I felt real bad about complaining about a few wet days.

 

[Ross]

Stillraining, allwet, mossy, swampthing,

have I covered it all yet.;D Just kidding. Bronze has a 5000 year track record. I think I will stick with that. I lived for a year and a half in eastern Oregon. Got real happy with 12 inches of rain each year. Didn't rain much here for July, August and most of September. I felt real bad about complaining about a few wet days.

 

[Salish Sea Cruiser]

How many thru-hulls does your boat have?

A Pacific Seacraft 34 has seventeen thru-hulls. Yikes!! The below water line ones are all "proper" thru-hulls. There are five of them at the waterline and they are the ball valve to thru-hull variety. I don't know if they are combo threads or not. That bothers me since those at the water line are only above water at best 50% of the time.The backing platers are "resin dipped plywood donuts."

 

[Salish Sea Cruiser]

How many thru-hulls does your boat have?

A Pacific Seacraft 34 has seventeen thru-hulls. Yikes!! The below water line ones are all "proper" thru-hulls. There are five of them at the waterline and they are the ball valve to thru-hull variety. I don't know if they are combo threads or not. That bothers me since those at the water line are only above water at best 50% of the time.The backing platers are "resin dipped plywood donuts."