|
|
22-10-2009, 11:44
|
#1
|
Registered User
Join Date: May 2006
Location: Nicholasville, Kentucky
Boat: 15 foot Canoe
Posts: 14,191
|
Bronze Seawater Strainers
Ok, I've decided to buy one of those Groco beauties but now they have plastic, stainless or monel filter baskets. Just as I make a decision to make a big ticket purchase there is another choice.
Is it worth the extra cost to get stainless or monel filter?
regards,
__________________
John
|
|
|
22-10-2009, 11:55
|
#2
|
Registered User
Join Date: Aug 2009
Location: Sarasota, FL
Boat: All kinds of 'em, from 9' dinks to 100+' motoryachts, power or sail...
Posts: 89
|
Probably depends on what the conditions are like where you're at, and which line you're installing it on (Raw water intake for main? Gen? AC? The more it's used, the more growth you'll see/the more you'll have to clean it). As far as the water itself, the temperature plays a big part, and with growth, well, it varies, even down to which marina you're at around here.
But generally speaking, I'd say yes, it's worth it to go w/the stainless at least.
Rob
__________________
USCG Lic. Capt. Rob Welling
Professional Delivery Captain
|
|
|
22-10-2009, 11:57
|
#3
|
CF Adviser
Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
|
If you're in a hot marina where you burn through zincs, you'll find you also burn through metal strainers, even monel.
__________________
cruising is entirely about showing up--in boat shoes.
|
|
|
22-10-2009, 12:01
|
#4
|
Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,515
|
metal
They used to just come with metal. My guess is metal will last longer for you. If you are banging it on the dock to get something out,,, etc Not sure what the $ premium is . Monel is the "best", but SS ought to be fine...
|
|
|
22-10-2009, 12:06
|
#5
|
Registered User
Join Date: Jul 2009
Boat: 48' 1963 S&S yawl
Posts: 851
|
Quote:
Originally Posted by Bash
If you're in a hot marina where you burn through zincs, you'll find you also burn through metal strainers, even monel.
|
I'd be interested to see what common marine metal is more electronegative than monel. How would it "burn through"?
|
|
|
22-10-2009, 23:08
|
#6
|
Registered User
Join Date: May 2006
Location: Nicholasville, Kentucky
Boat: 15 foot Canoe
Posts: 14,191
|
Thanks for the input. I'll be calling tomorrow to see who has the best prices.
regards,
__________________
John
|
|
|
22-10-2009, 23:24
|
#7
|
Registered User
Join Date: May 2006
Location: Nicholasville, Kentucky
Boat: 15 foot Canoe
Posts: 14,191
|
For engine raw water. The water temp here is in the 70s year round. No marina. Probably a bit of stray electrons in the water but not overly hot.
regards,
__________________
John
|
|
|
23-10-2009, 00:08
|
#8
|
Registered User
Join Date: Nov 2006
Location: Back in Northern California working on the Ranch
Boat: Pearson 365 Sloop and 9' Fatty Knees.
Posts: 10,469
|
Hi John...Just bought one for "Trust". It came with a plastic screen. All I can guess is it was cheaper to make. As far as-- "you'll find you also burn through metal strainers", I would question that as I cannot see the electrical path since the input hose and outlet hose would be full of air when the engine is not running due to the syphon break.
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"
|
|
|
23-10-2009, 03:24
|
#9
|
Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,384
|
Quote:
Originally Posted by S&S
I'd be interested to see what common marine metal is more electronegative than monel. How would it "burn through"?
|
Monel is listed as #63 on the galvanic series of metals in sea water from Army Missile Command Report, where the larger numbers indicate more noble (cathodic, less active) metals. In a galvanic couple, the metal higher in the series (or the smaller the number) represents the anode, and will corrode preferentially in the environment.
Stainless Steels (316 @ #67, 301 @ #72, 316L @ #76), Silicon Bronze (@ #70), and the Titaniums (#82 - #88) are all more noble than Monel.
➥ Corrosion Control - Galvanic Table
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
|
|
|
23-10-2009, 05:20
|
#10
|
Registered User
Join Date: Feb 2007
Location: Northern Vermont
Boat: "Piscator"
Posts: 87
|
Check Ebay for good price
Hi John,
I bought one on Ebay for a very good price about a year ago, brand new in the box. Monel screen.
We are finally in the water, launching party was several weeks ago in Newport, RI. Sitting at the dock trying to get the boat finished enough to head south to the Bahamas for the winter. We have at least several more weeks to go.
Here is the boat at the dock at Newport Shipyard, party tent in the background, bow of more typical Shipyard boat on the right (the majority of boats here are over 100'. We may be the smallest at 32').
Hope your boat is going well.
__________________
John
Chuck Paine Sarah 32 under construction
|
|
|
23-10-2009, 07:27
|
#11
|
Registered User
Join Date: Nov 2006
Location: Back in Northern California working on the Ranch
Boat: Pearson 365 Sloop and 9' Fatty Knees.
Posts: 10,469
|
Quote:
Originally Posted by Oceansandmts
Hi John,
I bought one on Ebay for a very good price about a year ago, brand new in the box. Monel screen.
We are finally in the water, launching party was several weeks ago in Newport, RI. Sitting at the dock trying to get the boat finished enough to head south to the Bahamas for the winter. We have at least several more weeks to go.
Here is the boat at the dock at Newport Shipyard, party tent in the background, bow of more typical Shipyard boat on the right (the majority of boats here are over 100'. We may be the smallest at 32').
Hope your boat is going well.
|
Beautiful boat!
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"
|
|
|
23-10-2009, 07:33
|
#12
|
Registered User
Join Date: Jul 2009
Boat: 48' 1963 S&S yawl
Posts: 851
|
Quote:
Originally Posted by GordMay
Monel is listed as #63 on the galvanic series of metals in sea water from Army Missile Command Report, where the larger numbers indicate more noble (cathodic, less active) metals. In a galvanic couple, the metal higher in the series (or the smaller the number) represents the anode, and will corrode preferentially in the environment.
Stainless Steels (316 @ #67, 301 @ #72, 316L @ #76), Silicon Bronze (@ #70), and the Titaniums (#82 - #88) are all more noble than Monel.
➥ Corrosion Control - Galvanic Table
|
Thanks! Passivated stainless would be a possible better chioice. Ours has a bronze body and monel screen(close numbers). No problems after 20 or so years. (Groco).
|
|
|
23-10-2009, 07:50
|
#13
|
CF Adviser
Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
|
not really certain
Quote:
Originally Posted by S&S
I'd be interested to see what common marine metal is more electronegative than monel. How would it "burn through"?
|
All I can tell you is that on a previous boat where I was having electrolysis problems that we finally tracked down to a nearby Sea Scout vessel, the monel basket in my bronze Groco strainer was the first indication of trouble. The strainer was fairly close to the thru-hull, but had no electrical connection to it and was not part of the boat's bonding system. A great deal of water circulated through it since it was attached to the refrigeration system.
Turns out the Sea Scouts had hooked up an automotive-type battery charger from a car parts store when their inverter/charger went south. Saved themselves a bit of cash and cost everyone else on the dock a fortune. Nearby boats would burn through their shaft zincs in about 6 weeks. The Bayliner next to the scout ship lost both trim tabs. But I was surprised that the monel didn't stand up to the situation, especially given how expensive those filters are.
__________________
cruising is entirely about showing up--in boat shoes.
|
|
|
23-10-2009, 07:54
|
#14
|
Registered User
Join Date: Jul 2009
Boat: 48' 1963 S&S yawl
Posts: 851
|
Quote:
Originally Posted by Bash
All I can tell you is that on a previous boat where I was having electrolysis problems that we finally tracked down to a nearby Sea Scout vessel, the monel basket in my bronze Groco strainer was the first indication of trouble. The strainer was fairly close to the thru-hull, but had no electrical connection to it and was not part of the boat's bonding system. A great deal of water circulated through it since it was attached to the refrigeration system.
Turns out the Sea Scouts had hooked up an automotive-type battery charger from a car parts store when their inverter/charger went south. Saved themselves a bit of cash and cost everyone else on the dock a fortune. Nearby boats would burn through their shaft zincs in about 6 weeks. The Bayliner next to the scout ship lost both trim tabs. But I was surprised that the monel didn't stand up to the situation, especially given how expensive those filters are.
|
Nuts! How'd you find out it was they that were frying the marina?
You'd think that the zincs would have saved the screen. Must have been isolated from them
|
|
|
23-10-2009, 08:12
|
#15
|
CF Adviser
Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
|
it became a "neighborhood" problem
Quote:
Originally Posted by S&S
Nuts! How'd you find out it was they that were frying the marina?
|
One of my neighbors was an electrical engineer, and he had a system where he could hook up his multimeter to an in-water probe and compare it to the electrical signature of the boat. He could even tell if your zincs were gone. He did this to several boats, mine included, and was able to triangulate on the Sea Scouts.
No surprises there. That "ship" had been an on-going disaster. The leader had sent the buys up the mast with steel wool to prep it for varnish, and the shreds landed on the non-skid of the boat in the downwind slip, which after a week turned red with rust. Not just flecks--the whole deck was red.
Back to the automotive battery charger, the scout leader denied any possibility that his "ship" was causing the problem, but his shore power lines mysteriously began disappearing from that moment forward, regardless of how often he replaced them. Couldn't seem to last the night. Problem solved.
__________________
cruising is entirely about showing up--in boat shoes.
|
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Rate This Thread |
Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Advertise Here
Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
Vendor Spotlight |
|
|
|
|
|