Date   

Re: [Amel Yacht Owners] Re: Auxiliary fuel tanks

Mark Pitt
 

Hi Thomas,

   I burned quite a bit of fuel doing the Panama to Galapagos trip in 2004 in my SM.  I bought fuel in Academy Bay (Galapagos) and ran it though my fuel polisher on the way to my tank.  Other cruisers with me in the Galapago also bought fuel and used their Baja or other filters.  None of us had a problem.  Compared to Indonesia and some other places, the fuel seem quite good.  On the 19 day passage from the Galapagos to Fatu Hiva (Marquesas) we only used about 300 liters but at the time of departure I certainly felt better knowing that the boat was full up with fuel (including 8 jerry cans).  I even filled a couple of jerry cans on Islas Isabella just before departure. The Galapagos was great -- a real highlight, albeit a bit rolly.  Don't miss it over fuel concerns.

    Mark Pitt

  Sabbatical III, SM #419, currently in Spain


On 12/27/2017 3:31 PM, thomas.kleman wrote:
Thanks Bill- We don't motor sail either, and try to sail from and to anchorable depths as a game (and for that time when our engine quits at an inopportune time). My interest in the fuel project is that we are planning on heading west from Bonaire after this next hurricane season and sailing to Columbia, Panama, and on to French Polynesia. I don't mind admitting that this will be a step up for us in terms of distance (it's just my wife and I).........I'm researching the fuel issue as I look at videos and read about the challenges of the routes I'm considering.

Depending on whether we stop in the Galapagos, the leg from Panama could be 28 days..........an extra 100-200 liters of fuel hopefully wouldn't be needed but might reduce my own stress in the first 10 days. We currently keep 5 Jerry cans in the life raft locker at the bottom and have the raft in the port cockpit lazarette. I'm not entirely happy with this arrangement and I've been researching alternatives for 3 years, off and on. 

Always good to get input from Amel owners who have more miles under their keels than we do.


Re: [Amel Yacht Owners] Re: Auxiliary fuel tanks

eric freedman
 

Hi Thomas,

Did you read my posts about adding fuel bladders and auxiliary tanks to  Kimberlite Amel

Super Maramu #376?

 

The fuel in the Galapagos can be quite poor and I would not suggest taking on fuel there.

Fair Winds

Eric

 

 

From: amelyachtowners@... [mailto:amelyachtowners@...] On Behalf Of thomas.kleman
Sent: Wednesday, December 27, 2017 3:31 PM
To: amelyachtowners@...
Subject: RE: [Amel Yacht Owners] Re: Auxiliary fuel tanks

 

 

Thanks Bill- We don't motor sail either, and try to sail from and to anchorable depths as a game (and for that time when our engine quits at an inopportune time). My interest in the fuel project is that we are planning on heading west from Bonaire after this next hurricane season and sailing to Columbia, Panama, and on to French Polynesia. I don't mind admitting that this will be a step up for us in terms of distance (it's just my wife and I).........I'm researching the fuel issue as I look at videos and read about the challenges of the routes I'm considering.

 

Depending on whether we stop in the Galapagos, the leg from Panama could be 28 days..........an extra 100-200 liters of fuel hopefully wouldn't be needed but might reduce my own stress in the first 10 days. We currently keep 5 Jerry cans in the life raft locker at the bottom and have the raft in the port cockpit lazarette. I'm not entirely happy with this arrangement and I've been researching alternatives for 3 years, off and on. 

 

Always good to get input from Amel owners who have more miles under their keels than we do.


Re: [Amel Yacht Owners] Re: Auxiliary fuel tanks

thomas.kleman <no_reply@...>
 

Thanks Bill- We don't motor sail either, and try to sail from and to anchorable depths as a game (and for that time when our engine quits at an inopportune time). My interest in the fuel project is that we are planning on heading west from Bonaire after this next hurricane season and sailing to Columbia, Panama, and on to French Polynesia. I don't mind admitting that this will be a step up for us in terms of distance (it's just my wife and I).........I'm researching the fuel issue as I look at videos and read about the challenges of the routes I'm considering.

Depending on whether we stop in the Galapagos, the leg from Panama could be 28 days..........an extra 100-200 liters of fuel hopefully wouldn't be needed but might reduce my own stress in the first 10 days. We currently keep 5 Jerry cans in the life raft locker at the bottom and have the raft in the port cockpit lazarette. I'm not entirely happy with this arrangement and I've been researching alternatives for 3 years, off and on. 

Always good to get input from Amel owners who have more miles under their keels than we do.


Re: [Amel Yacht Owners] Re-rigging and mast step

thomas.kleman <no_reply@...>
 

I was advised to run a line along the deck between the base of the main mast (the vang attaches here) and the on-deck cleat, with a fairlead about 12 inches to port of the mast; then to a dedicated block mounted under the genoa block in the large chainplate hole. In this way you can store the staysail sheet just above this block on the rail and retrieve it easily without going on deck in "staysail conditions".............based on an "N" of 2, it seems to work well although I'm still fiditzing with it.

Tom Kleman
SV L'ORIENT
SM2K # 422


Re: [Amel Yacht Owners] SSB Grounding/Earthing

eric freedman
 

Bill,

You have that 100 % right,

You do not want to hook the transceiver to the yellow green bonding.

Fair Winds

Eric

Kimberlite Amel Super Maramu #376

 

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Wednesday, December 27, 2017 11:37 AM
To: amelyachtowners@...; Daniel Frey
Subject: Re: [Amel Yacht Owners] SSB Grounding/Earthing

 

 

Daniel,

 

You are asking a very important question. I have found that this subject seems to be misunderstood by many Amel owners and some Amel employees.

 

First and very important, from reading your email, I believe you may be confusing the yellow/green Amel Bonding wire with 220VAC "Earth." The 220VAC Earth wire is also yellow/green. You need to have a good understanding of the difference. This is especially confusing because they look identical.

 

Secondly, I am not an SSB expert, but FYI, when Amel installed an SSB on SM's, they did not connect any component to either the Amel bonding wire or Earth wire. 

 

Amel also removed the BLU wire which connects the skeg-mounted sintered SSB ground plate to the Amel Bonding system. On a SM this is behind a panel at the Nav station and the BLU yellow/green wire is connected to a connector block (see photo). The BLU wire is only connected to the sintered SSB ground plate. Once you disconnect it from the connector block at the cart table it is not connected to anything else.

 

 

Best,

 

CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  
http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970


Re: [Amel Yacht Owners] Re: Weigh carrying capacity of SM

Beaute Olivier
 

Hello Kent and Bill,

overloading a vessel not only changes its stability but also brings more power into the structure and masts/rigging.
A big overload could result in stringers/bulkheads breaking when the vessel hits the waves in heavy conditions, possibly breaking shrouds strands too.
The Super Maramu has a light displacement of 15.3 tons (with masts, sails, running rigging, some mooring lines and fenders). The tanks (water and fuel) take 1.5 tons.
You should not load with more than 2.5 tons (including crew and life-raft...).

Stay safe and have all a happy new year!

Olivier


On Monday, December 25, 2017 6:46 PM, "greatketch@... [amelyachtowners]" wrote:


 
Kent,

I suspect when you describe your boat's current waterline status you are looking at the painted waterline on the hull.  That is not the waterline as drawn for the boat on her design drawings.  

When we picked up Harmonie she was almost empty of gear.  I saw the painted waterline was significantly higher at the bow then the stern. About 3 inches if my memory is correct.  This struck me as very odd for an unloaded boat.  So I measured the distance from the water to the gunwale at bow and stern and compared to the architects drawing.  She was spot on her correct fore and aft trim as per the drawing.

Take away lesson:  The painted waterline is not necessarily where she should sit!  If you were to load our boat until the water at the bow was even with the painted line, you would have water at the top of the bowthruster well, and maybe over it!  Note that I have NOT done this measurement on ANY other Amel.  It is possible it only applies to #160.  Amel might have changed the painted waterlines at other times, or a previous owner might have changed yours!  

I do not know if Amel painted the waterline higher at the bow on our boat as an aesthetic thing, or just got it wrong, but it's definitely not where the boat should sit in the water.

As for how much you can carry...

A Super Maramu has a LWL of 41.3 feet, a Waterline Beam of about 14.5 feet...
A SM has a LWL Area of (very roughly) 0.67 *41.3* 14.5 ~ 400 sq feet
So to sink her a extra inch overall will take 400 * 5.33 ~ 2,100 lbs or close to one ton. 
That's actually a pretty conservative number for a SM because as she settles deeper her LWL becomes a bit longer. 

So how deep you can take her...  I don't have a good answer.  

If loaded so the heavy stuff was down as low as possible and not concentrated at the ends of the boat, I'd guess two inches (two tons) would be a conservative number.  

Carrying that much weight as "deck cargo" would certainly reduce the stability of the boat. But I have no idea if it would be dangerous because I don't know her designed center of gravity or metacentric height.  For a real answer I think you'll have to talk to a naval architect, or ask Amel.

Honestly, my suggestion would be to take the money you would spend on the fuel for that trip and donate it to have the material shipped commercially to the nearest working port.  

Bill Kinney
SM160, Harmonie
Key West, FL


---In amelyachtowners@..., wrote :

Hi all.
We are going to carry supplies to Caribbean from Ft Lauderdale to hurricane stricken islands this winter. I'm wondering how much weight I can take on safely. Loaded with all our supplies and provisions, Kristy sits about 1 1/2 inches above the original waterline in the stern, and 4 inches above waterline at the bow.

Can I load her to that waterline? If I go above it, the engine and generator exhausts will be below the water. That doesn't seem like a good idea. If that is ok, what other considerations are important if I load her another inch or more above the waterline?

I was going to carry one pallet (40" x 40" x48") on the foreword cabintop and another one or two broken down below decks as carrying capacity allows. I don't know the weight of the pallets yet.

Any thoughts?

Thanks andMerry Christmas!
Kent
SM 243
Kristy



Re: [Amel Yacht Owners] SSB Grounding/Earthing

Bill & Judy Rouse <yahoogroups@...>
 

Daniel,

You are asking a very important question. I have found that this subject seems to be misunderstood by many Amel owners and some Amel employees.

First and very important, from reading your email, I believe you may be confusing the yellow/green Amel Bonding wire with 220VAC "Earth." The 220VAC Earth wire is also yellow/green. You need to have a good understanding of the difference. This is especially confusing because they look identical.

Secondly, I am not an SSB expert, but FYI, when Amel installed an SSB on SM's, they did not connect any component to either the Amel bonding wire or Earth wire. 

Amel also removed the BLU wire which connects the skeg-mounted sintered SSB ground plate to the Amel Bonding system. On a SM this is behind a panel at the Nav station and the BLU yellow/green wire is connected to a connector block (see photo). The BLU wire is only connected to the sintered SSB ground plate. Once you disconnect it from the connector block at the cart table it is not connected to anything else.



Best,

CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970


Re: [Amel Yacht Owners] Re: Pump Replacement and backflow preventers

Bill & Judy Rouse <yahoogroups@...>
 

B. Kinney,

Like I said, I have several theories as to why a one-way (check) valve was installed in the output line near the pump. However, to state those theories would be stating speculation and unlike some, I really don't like to publically speculate because it may be taken by others as fact. So, when I have a choice, I do not state unproven theories publically. And, when I am in in doubt, I believe it is safe to assume that Amel's original design is the best option.

Best,

CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970


Help- Where do I find...

jgermain@...
 

... files/photos etc to dismantle a Bonfiglioli Main sail outhaul?  I also need the numbers for the bearings and the seals to order replacements.


Second question: DRIFT... I have posted many replies to various queries yet my posts do not show when I open a thread... anyone doing me a dirty?


Happy New Year everyone.

 

 


Re: [Amel Yacht Owners] Re: Bilge maintenance

Patrick McAneny
 

Bill, Since you don't use bleach , what if anything do you put in your water tank to reduce bacteria growth .
Happy Holidays,
Pat SM #123


-----Original Message-----
From: greatketch@... [amelyachtowners]
To: amelyachtowners
Sent: Mon, Dec 25, 2017 3:34 pm
Subject: Re: [Amel Yacht Owners] Re: Bilge maintenance

 
We don't have any trouble with the bilge smell in the boat, for two reasons.  

We are not terribly fussy about what goes down the drain, but we do always was dishes with the strainer in the drain.  We also have a sink trap that catches other "chunks" under the sink in the galley. I wouldn't say we were any more careful about this than we would be in home without a garbage grinder.

We also have "U" traps made of three elbows and tubing where the drains empty into the sump.  Always full of water, they prevent the backup of any engine room odors into the cabin.

Bleach is something I don't use on the boat at all.  It is just too corrosive to too many things.

I clean the sump when it looks like it has accumulated enough "gunk" to need it.  It's not very often it needs it. I look whenever I am in the engin e room, but I don't have the cleaning on my routine maintenance schedule.  

Bill Kinney
SM160, Harmonie
Key West, FL



Re: [Amel Yacht Owners] SSB Grounding/Earthing

Jean-Pierre's MacBook Air <jgermain@...>
 

Hello Daniel,

First time I’ve seen your name here; WELCOME!

For the HF, go to Facebook “Offshore SSB Radio and Email”.

Excellent knowledge base.


Jean-Pierre Germain
SY Eleuthera, SM 007
Panama. 

On 27 Dec 2017, at 04:39, danielmfrey63@... [amelyachtowners] <amelyachtowners@...> wrote:


Hello


I have installed an Icom M801E on my Santorin. My setting: The Transceiver is at the navigation table, the tuner in the Lazarette, the ground plate in the skeg plus a whip antenna.

The Transceiver is connected with the tuner via control cable and an antenna cable.

The control cable has on both ends small earthing wires, which connect to the Transceiver earthing point resp. to the tuner earthing point.

The tuner is connected/earthed to copper piece in the Lazarett.

Have you additionally earthed the Transceiver with a yellow/green cable? If yes, where does it go to? To the ground plate / the copper in the Lazarette which goes to the ground plate in the skeg? Or, if yes, does it go to the tuner?

Thanks for Your advice.

Best - Daniel

SY HEUREKA (SN 64), Kuşadası (Turkey)





SSB Grounding/Earthing

danielmfrey63@...
 

Hello


I have installed an Icom M801E on my Santorin. My setting: The Transceiver is at the navigation table, the tuner in the Lazarette, the ground plate in the skeg plus a whip antenna.

The Transceiver is connected with the tuner via control cable and an antenna cable.

The control cable has on both ends small earthing wires, which connect to the Transceiver earthing point resp. to the tuner earthing point.

The tuner is connected/earthed to copper piece in the Lazarett.

Have you additionally earthed the Transceiver with a yellow/green cable? If yes, where does it go to? To the ground plate / the copper in the Lazarette which goes to the ground plate in the skeg? Or, if yes, does it go to the tuner?

Thanks for Your advice.

Best - Daniel

SY HEUREKA (SN 64), Kuşadası (Turkey)



Re: [Amel Yacht Owners] Re: Pump Replacement and backflow preventers

greatketch@...
 

Bill,

I am not sure where we disagree.  

You seem to accept that that backward flow through the AC circuit is possible.  If it was not possible, why have the check valve?  They only have one purpose:  stopping reverse flow.  

If water can flow backward, then it would not be long before the hose was empty and air was being sucked into the sea water circuit.  Must be: because the discharge end of the hose is above the water line.

I can not address the toilet pump.  My boat doesn't have one, I have never seen that setup, so I don't know what kind of pump it is or the piping details, or if there is a check valve. 

Bill Kinney
SM160, Harmonie
Key West, FL





---In amelyachtowners@..., <yahoogroups@...> wrote :

B Kinney, 

I believe you are incorrect.

The engine and the generator have seperate connections to the Sea Chest which are "superior" to the saltwater manifold connection. In other words, the saltwater manifold is connected higher than the engine or generator....the only way that either the generator or the engine would suck air through the AC water pump is if the sea chest is clogged or turned OFF. If it is, either the engine or the generator would suck water/air through everything including the toilet saltwater siphon break. However, before any of this would happen the vacuum alarm switch (circa about year 2000) would be activated, energising the alarm and light.

Like I said, I do not know exactly why it is there, but I have several theories.

Best,

CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970



Re: [Amel Yacht Owners] Re: Pump Replacement and backflow preventers

Bill & Judy Rouse <yahoogroups@...>
 

B Kinney, 

I believe you are incorrect.

The engine and the generator have seperate connections to the Sea Chest which are "superior" to the saltwater manifold connection. In other words, the saltwater manifold is connected higher than the engine or generator....the only way that either the generator or the engine would suck air through the AC water pump is if the sea chest is clogged or turned OFF. If it is, either the engine or the generator would suck water/air through everything including the toilet saltwater siphon break. However, before any of this would happen the vacuum alarm switch (circa about year 2000) would be activated, energising the alarm and light.

Like I said, I do not know exactly why it is there, but I have several theories.

Best,

CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970

On Tue, Dec 26, 2017 at 6:40 PM, greatketch@... [amelyachtowners] <amelyachtowners@...> wrote:
 

Bill,


Those are exactly the valves I was referring to. My boat has two of them, one for each of the separate AC cooling pumps.  The check valves are there so that the genset and engine can't suck air back through the AC pump.  

If the only possibility was to back flow water, you might be able to skip it, but if you follow the AC cooling water line far enough it exits the boat at, or just above, the water line.  If you flow backwards though it, you will pretty soon pull air into the seawater manifold.  This is most likely if the seachest strainer is a "little bit" clogged, but can not be ruled out at any time. Centrifugal pumps offer no resistance to back flow of either air or water if they are not running. The need for a check valve is independent of the specifics of the Calpeda pump, it is needed for any centrifugal pump.

A check valve is not needed on the engine and genset raw water cooling circuits because those are positive displacement pumps and significant back flow is not possible (assuming all the vanes are on the impeller!) 

A failed open check valve on the AC pumps would be something to look for in case of a mysterious or occasional overheating or if there is frequent impeller failure on the genset or main engine that can't be traced to other causes.

On any plumbing system that uses a single source (the seachest) teed to multiple users some means of backflow prevention is required.  Either positive displacement pumps or check valves are needed on each circuit, or you will pull air back into the suction of the running pumps.

Bill Kinney
SM1690, Harmonie
Key West, FL



---In amelyachtowners@yahoogroups.com, wrote :


Duane, & B Kinney,

The check-valve Duane is referring to is on the output line of the Amel installed Calpeda AC Impeller Pump. This valve keeps unpressurized water from flowing back into the pump and sea chest when the pump is OFF. I am not sure why it is installed, but I have several theories.

Duane,

Each of those March pumps I have seen installed on an Amel is a victim of rust. That particular pump is not really marinized for saltwater installations. If you use that pump, keep a watchful eye for rust. As you probably know, the toilet flush water-siphon break system is above the A/C pump on a SM. You may be very careful to keep saltwater off of that pump, but will get drops from the siphon-break.

Best,




--


Re: [Amel Yacht Owners] Re: Pump Replacement and backflow preventers

greatketch@...
 

Bill,

Those are exactly the valves I was referring to. My boat has two of them, one for each of the separate AC cooling pumps.  The check valves are there so that the genset and engine can't suck air back through the AC pump.  

If the only possibility was to back flow water, you might be able to skip it, but if you follow the AC cooling water line far enough it exits the boat at, or just above, the water line.  If you flow backwards though it, you will pretty soon pull air into the seawater manifold.  This is most likely if the seachest strainer is a "little bit" clogged, but can not be ruled out at any time. Centrifugal pumps offer no resistance to back flow of either air or water if they are not running. The need for a check valve is independent of the specifics of the Calpeda pump, it is needed for any centrifugal pump.

A check valve is not needed on the engine and genset raw water cooling circuits because those are positive displacement pumps and significant back flow is not possible (assuming all the vanes are on the impeller!) 

A failed open check valve on the AC pumps would be something to look for in case of a mysterious or occasional overheating or if there is frequent impeller failure on the genset or main engine that can't be traced to other causes.

On any plumbing system that uses a single source (the seachest) teed to multiple users some means of backflow prevention is required.  Either positive displacement pumps or check valves are needed on each circuit, or you will pull air back into the suction of the running pumps.

Bill Kinney
SM1690, Harmonie
Key West, FL



---In amelyachtowners@..., <yahoogroups@...> wrote :

Duane, & B Kinney,

The check-valve Duane is referring to is on the output line of the Amel installed Calpeda AC Impeller Pump. This valve keeps unpressurized water from flowing back into the pump and sea chest when the pump is OFF. I am not sure why it is installed, but I have several theories.

Duane,

Each of those March pumps I have seen installed on an Amel is a victim of rust. That particular pump is not really marinized for saltwater installations. If you use that pump, keep a watchful eye for rust. As you probably know, the toilet flush water-siphon break system is above the A/C pump on a SM. You may be very careful to keep saltwater off of that pump, but will get drops from the siphon-break.

Best,

CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970


Re: [Amel Yacht Owners] Re: Pump Replacement and backflow preventers

Bill & Judy Rouse <yahoogroups@...>
 

Duane, & B Kinney,

The check-valve Duane is referring to is on the output line of the Amel installed Calpeda AC Impeller Pump. This valve keeps unpressurized water from flowing back into the pump and sea chest when the pump is OFF. I am not sure why it is installed, but I have several theories.

Duane,

Each of those March pumps I have seen installed on an Amel is a victim of rust. That particular pump is not really marinized for saltwater installations. If you use that pump, keep a watchful eye for rust. As you probably know, the toilet flush water-siphon break system is above the A/C pump on a SM. You may be very careful to keep saltwater off of that pump, but will get drops from the siphon-break.

Best,

CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School  http://www.amelschool.com
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970


Re: Pump Replacement and backflow preventers

Duane Siegfri
 

Bill,

Thanks for the information!  I just wasn't sure what the downside of not having one is.

Happy holidays!
Duane


Re: Hurth Transmissions freewheeling folding prop

John Clark
 

Ian, I agree.  I haven't noticed any great lack of performance, except maybe in very light wind.  We are at hull speed rather easily at 15 kts, at 10 kts we can pretty much hold 5-6 kts at most points of sail.  This is while the shaft alternator is carrying all electrical loads.  We added solar shortly after purchasing the boat and no run the generator for maybe an hour every day in the morning.  If we are not on the boat, I turn off the inverters and the solar array holds the batteries near full charge and keeps the three refrigerator/freezers running.   We could probably not run the generator every day but it makes the morning easier (hot water, coffee, microwave, dish washer...)


Re: Pump Replacement and backflow preventers

greatketch@...
 

Duane,

The Marco pump has a built in check valve, you do not need to add another one.

Check valves are required on the centrifugal AC pumps. If there is no check valve when another pump (engine, genset, toilet) pulls water from the sea chest is is possible for water, and then air, to back flow through the AC pump and then with air in the system, everything goes wrong.

This is the downside of having a common seachest supplier multiple raw water users.

Bill Kinney
SM160, Harmonie
Key West, FL.


---In amelyachtowners@..., <sailor63109@...> wrote :

Merry Christmas all!


I'm replacing some of the engine room pumps, and I'm wondering if I need a backflow preventer?


I've installed a Marco gear pump (UP3/E) for the fresh water system.  It doesn't run unless a faucet is opened so it doesn't seem to need one.  (By the way, this is a noisy pump, you don't need a red light on the panel to know it's running).


I also have installed a March AC-5C-MD pump to replace the airconditioning pump.  What's the reason Amel put a backflow preventer on the orginal centrifugal pump?   Would backflow damage a centrifugal pump?


By the way, this pump has a lot of openings around the rotor so I'm making a cover for it for when there is anything wet happening in the engine room.  They make a sealed version of this pump but it's twice the cost.


Thanks,

Duane

Wanderer, SM#477


Pump Replacement and backflow preventers

Duane Siegfri
 

Merry Christmas all!


I'm replacing some of the engine room pumps, and I'm wondering if I need a backflow preventer?


I've installed a Marco gear pump (UP3/E) for the fresh water system.  It doesn't run unless a faucet is opened so it doesn't seem to need one.  (By the way, this is a noisy pump, you don't need a red light on the panel to know it's running).


I also have installed a March AC-5C-MD pump to replace the airconditioning pump.  What's the reason Amel put a backflow preventer on the orginal centrifugal pump?   Would backflow damage a centrifugal pump?


By the way, this pump has a lot of openings around the rotor so I'm making a cover for it for when there is anything wet happening in the engine room.  They make a sealed version of this pump but it's twice the cost.


Thanks,

Duane

Wanderer, SM#477