Nordhavn Expedition Yacht Fish 75 Sinks?

Very good answer and also very true

We have been installing pre-strainers for their post-strainers for a couple years now. I agree, leaving the post-strainer is good for keeping impeller parts out of the system. I understand a new suction-side system is coming, but it typically takes Sweden 3-5 years to respond to such issues.

Hi, Do you have any influence with the manufacturer that can add any credence to your claim?

Most seachests are an open hole in the hull bottom with a grate, however water intake does lose some speed/velocity in the seachest as the opening is much larger allow some particulate to drop out, the the size of the thru-hull going to the raw water pump, and many other thru-hulls going to other things such as the generator etc. I have also seen some seachests that had a large thru-hull going to the seachest above it/mounted to it, and then had smaller thru-hulls running off of it.

If you're telling me that a 1' maybe 2' section of 3" or 4" wire bound hose going from the raw water pump on the engine to the sea-strainer mounted on a stringer isn't going to transmit some vibration to the stringers, you've surely never stepped foot in the engine room on a larger sportfish with NON-commonrail MANS running in gear on 1 cylinder bank. You don't need to put your hand on it, you can see it. As well as other engines to a lesser degree.

That same very large and successful sportfishing boat builder is also the largest user of the same MAN engines that you are referring to and they do not have strainers and yet you can still feel the vibrations when running on one bank. Strange one that ?.

I still think you need to edit the original post and then maybe have another look at your latest as I think I am reading that there are "smaller thru' hulls running off of it". do you mean valves mounted on the side of the sea chest.

What is the actual drop in speed / velocity of the water.

As for those strainers on the Volvo's, they denied there was any problem for the best part of two years and 60+ boats with IPS's installed from one manufacturer alone. They were paying for one alternator that was mounted on the inboard forward area of the port engine and that was being sprayed by the water leaking out of the strainer mounted on the forward inboard area of the starboard area plus they would pay for the forward engine mounts on the engines. They rather do that then admit their mistake and do as everybody was doing anyway and installing Groco's in-line before the sea water pump.

They, VP, now have a different top on the strainer and they are still installing them in the pressure side of the system (as far as I know)

And they are?

Similar story to Strainers and Mud Boxes

You want a PV Diagram or what?

I used to deal with a pair of KAD 44's in the mid 90's thru 2002. The best routine was to change all rubber bits before Boss arrived, neither the Belts nor Impeller ever **** themselves on a Boss Trip after this routine was established. It is no fun laying on top of a boiling engine changing either while the big man stresses, I have done it twice and try to avoid these situations as far as possible these days.

Hi, Do you have any influence with the manufacturer that can add any credence to your claim?

Not sure I catch the drift, but it begs credibility?

I simply work with a builder that introduced the first IPS powered boat in the US. We have had many overheating issues, and have been installing Groco 2000 strainers on the intake side to remedy them, at our own expense.

Not sure anyone has influence with Volvo corporate, and the least of all would be me.

I did, however, just see an IPS 600 on display in Miami with the strainer on the suction side of the pump, where it should be. There have been countless compaints about their pressure side strainer since that first IPS model in 2004. That would make the Volvo Sweden reaction time 7 years, not 5-6.

Did that answer your question K1W1?

Soooo, is there any news on the Nordy?

Which Nordy..?

"Nordhavn Expedition Yacht Fish 75 Sinks?"

The Melanie Jeane?

Hi,

This is what I posted just after asking the question.

The answer I was after is they are a great place to find the blades that have come off the Impeller before they get to the coolers.

Personally I hate those plastic things Volvo use apart from what I just wrote.

http://www.yachtforums.com/forums/121116-post19.html

Yep, I read the entire thread. I was looking for new information on status.


Thanks

She is sitting in the yard. Word is they will repair her. Nothing new on the cause for sinking. As you would expect, nobody is talking in anticipation of the lawyers taking the lead.

34 years, not 7. SW filter on the pressure side has been used by Volvo since the introduction of the AQD40A in 1977.

Karl

Thank you. I'd be curious to see pix of the interior. I can not imagine what the owner is going through.

This thread left the Nordhavn story a long time ago....

How do you figure that?

The boat was tied to the dock with, most likely, the shore cord plugged in and the battery charger on. So the pumps could have kept running indefinitely.

And if the boat was underway the batteries would be getting charged via the engines or again the charger through the genset.

I don't believe anybody is saying just put in only large capacity pumps. Just that having only small capacity pumps is worthless in a situation like the Nordhavn's.

But having nothing but large automatic pumps sure beats only having small ones like what apparently was on the Nordhavn. And it can lead to the need for less thru hulls.

Yes it did and some of the posts are worthy of their own thread. At the same time, it's funny how many posts are the same basic information or question listed early in the thread and how many miss facts already stated. Number and size of pumps carried on the Nordy for instance.

Since last week there is another thread on Bilge Pumps why I think we can end that kind of general discussions in this thread and continue here:

http://www.yachtforums.com/forums/technical-discussion/15559-determining-bilge-pump-size.html