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Post by banned on Mar 18, 2020 6:21:42 GMT -5
We used to use PSS on our boats. Freezing and dirty water tears them up then if someone steps on it. The simplicity is nice but just to delicate IMO.
Brian
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Post by krush on Mar 18, 2020 8:09:41 GMT -5
....... But what's not to like? It's the same seal technology as most water pumps. Why the hate? I have no problem with the seal design. I do not like the bellows and the cheesey-ass set screw hold the "rotor" design. I think PSS came out with a new design. Check out the LASDROP Gen2. It uses a traditional thick hose. The "rotor" part is clamped/squeezed to the shaft and it has a big spring built in to the rotor (so no cheesey bellows). Brian, does client require PSS seals? I've been up close and personal with all of them at boat show, and I really think LASDROP GenII is built much better. The owner talked with me for 30+ minutes, mostly about engineering stuff. Also, if LasDrop seal truly fails, inside the hose, there is very little restriction for a leak, so the water flow shouldn't be wide open. It almost could be called like a safety seal inside, but it doesn't touch the shaft. . And now I got half saying shaft seal, half saying packing box. WTF?! I'm truly on the fence. With new packing, they both are pretty much the exact same price.  |
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Post by yachtsmanwilly on Mar 18, 2020 9:30:05 GMT -5
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Post by krush on Mar 18, 2020 12:11:32 GMT -5
Remember now, there are two direction flows on the condenser packing! The steam seal regulator keeps it around a couple PSI. Depending on turbine load the regulator is venting or providing steam.
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Post by Avenger on Mar 18, 2020 15:52:14 GMT -5
That does look stouter, but I'd bet if you're operating in silt or whatever it will fail just as fast. The rubber bellows are pretty stout. I agree, not wire reinforced, but still fairly heavy. Does anybody have any actual instances of PSS failures, or is this more internet speculation?
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Post by badhattitude on Mar 18, 2020 20:42:57 GMT -5
I've seen a few dripless disasters. Most because the coming hose broke off and flooded the boat.
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Post by banned on Mar 19, 2020 6:43:28 GMT -5
We saw lots of problems with people continuously ordering parts most common was leaking because the seal surface got dirt in it and just won't seal anymore. I just don't see the logic to any drip less seal no matter how simple or well designed. A close fitting stuffing box with gor tex packing is requiring no attention for 6 months or more on boats that get used daily most in dirty water and then simply require a little tightening. It's a no brain er I'm happy to be done with them.
Brian
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Post by Avenger on Mar 19, 2020 8:43:12 GMT -5
As I said, I wouldn't add them if the boat didn't already have them. But I have to say they've been holding up well. Even that time the water feed got plugged. This year I'm adding a cross-feed to prevent that. The other thing I've learned is that if the boat sits for a long time, which mine certainly does, is to "burp" them to get water on the seal faces before putting things in gear.
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Post by krush on Mar 19, 2020 9:45:57 GMT -5
I spoke with DuraMax guy again today asking about interference fit. He said check out this company for packing box: www.retmarine.com/ All USA and they can whip out custom stuff fast. Looks like they do lots of stuff for lobsta boats EDIT: Holy SHIT. $889 For ONNE stuffing box 2"shaft 3"stern tube. I'll call and chat, but nevermind on that! Video: |
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Post by banned on Mar 19, 2020 18:48:33 GMT -5
That's to much. We pay 500 for 2.5" shaft 4" tube. Buck Algonquin now called Hydrosearch
Brian
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