Topics

Dessalator Watermakers & Filmtec Membranes


 

I learned something today with from a great 54 owner, from Dessalator, and from reading the recent specifications sheet for Filmtec SW30 membranes.

·        The actual pressure for the Green Zone on a Dessalator high-pressure gauge is between 60 and 65 BAR

·        In normal seawater temperature and salinity and at 55 BAR the SW30 series of membranes will produce:

o   SW30 2521 = 47 liters/hour or 3*47 = 141 liters/hour

o   SW30 2540 = 109 liters/hour or 2*109 = 218 liters/hour

·        Obviously the production rate with pressure set inside the Green Bar (60-65 BAR), will be greater than the above

·        Dialing back the pressure to change the product water production to the original specs of the watermaker may cause the water maker to shut down.

My statement of reducing the pressure to set the produced water in the sight-glass at the original output for the D50/60, D100, and D160 is no longer valid for normal water temperature and salinity. And the D160 with new membranes will produce over 200 liters/hour.

 

WARNING: Filmtec has increased the efficiency of these membranes and depending on the age of your membrane(s) you may not see the increased production.


I attach the Filmtec Spec Sheet that I refer to:



I hope this helps and clears up things.


Bill

CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


Matt Salatino
 

Won’t running over 56-58 bar affect the membrane life?
Off hand do you know the pressure range specs for the membrane?
I run ours at the low end of the green, thinking I’m being safe.
~~~⛵️~~~Matt

On Sep 9, 2020, at 8:49 PM, CW Bill Rouse <brouse@...> wrote:

I learned something today with from a great 54 owner, from Dessalator, and from reading the recent specifications sheet for Filmtec SW30 membranes.

·        The actual pressure for the Green Zone on a Dessalator high-pressure gauge is between 60 and 65 BAR

·        In normal seawater temperature and salinity and at 55 BAR the SW30 series of membranes will produce:

o   SW30 2521 = 47 liters/hour or 3*47 = 141 liters/hour

o   SW30 2540 = 109 liters/hour or 2*109 = 218 liters/hour

·        Obviously the production rate with pressure set inside the Green Bar (60-65 BAR), will be greater than the above

·        Dialing back the pressure to change the product water production to the original specs of the watermaker may cause the water maker to shut down.

My statement of reducing the pressure to set the produced water in the sight-glass at the original output for the D50/60, D100, and D160 is no longer valid for normal water temperature and salinity. And the D160 with new membranes will produce over 200 liters/hour.

 

WARNING: Filmtec has increased the efficiency of these membranes and depending on the age of your membrane(s) you may not see the increased production.


I attach the Filmtec Spec Sheet that I refer to:



I hope this helps and clears up things.


Bill

CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


 

Mat,

Not according to Dessalator who states that the green bar on their high-pressure gauge is set for between 60 - 65 BAR. And according to Filmtec the Maximum operating pressure is 69 BAR

image.png
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 2:17 PM Matt Salatino via groups.io <helmsmatt=yahoo.com@groups.io> wrote:
Won’t running over 56-58 bar affect the membrane life?
Off hand do you know the pressure range specs for the membrane?
I run ours at the low end of the green, thinking I’m being safe.
~~~⛵️~~~Matt

On Sep 9, 2020, at 8:49 PM, CW Bill Rouse <brouse@...> wrote:

I learned something today with from a great 54 owner, from Dessalator, and from reading the recent specifications sheet for Filmtec SW30 membranes.

·        The actual pressure for the Green Zone on a Dessalator high-pressure gauge is between 60 and 65 BAR

·        In normal seawater temperature and salinity and at 55 BAR the SW30 series of membranes will produce:

o   SW30 2521 = 47 liters/hour or 3*47 = 141 liters/hour

o   SW30 2540 = 109 liters/hour or 2*109 = 218 liters/hour

·        Obviously the production rate with pressure set inside the Green Bar (60-65 BAR), will be greater than the above

·        Dialing back the pressure to change the product water production to the original specs of the watermaker may cause the water maker to shut down.

My statement of reducing the pressure to set the produced water in the sight-glass at the original output for the D50/60, D100, and D160 is no longer valid for normal water temperature and salinity. And the D160 with new membranes will produce over 200 liters/hour.

 

WARNING: Filmtec has increased the efficiency of these membranes and depending on the age of your membrane(s) you may not see the increased production.


I attach the Filmtec Spec Sheet that I refer to:



I hope this helps and clears up things.


Bill

CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


Matt Salatino
 

Specs online are max pressure 69 bar/1000 psi. 

~~~⛵️~~~Matt A50#27

On Sep 9, 2020, at 8:49 PM, CW Bill Rouse <brouse@...> wrote:

  SW30 2521


Matt Salatino
 

Thanks Bill,
After I asked, I figured I’d man-up and search for myself. I found the exact page you posted.
I guess it’s safe to run a bit higher pressure. The WM will shut off if the pressure goes too high I believe......
Well this means that the float in the flow meter will disappear when the pressure is higher in the green zone (it does).

~~~⛵️~~~Matt

On Sep 9, 2020, at 9:23 PM, CW Bill Rouse <brouse@...> wrote:

Mat,

Not according to Dessalator who states that the green bar on their high-pressure gauge is set for between 60 - 65 BAR. And according to Filmtec the Maximum operating pressure is 69 BAR

<image.png>
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 2:17 PM Matt Salatino via groups.io <helmsmatt=yahoo.com@groups.io> wrote:
Won’t running over 56-58 bar affect the membrane life?
Off hand do you know the pressure range specs for the membrane?
I run ours at the low end of the green, thinking I’m being safe.
~~~⛵️~~~Matt

On Sep 9, 2020, at 8:49 PM, CW Bill Rouse <brouse@...> wrote:

I learned something today with from a great 54 owner, from Dessalator, and from reading the recent specifications sheet for Filmtec SW30 membranes.

·        The actual pressure for the Green Zone on a Dessalator high-pressure gauge is between 60 and 65 BAR

·        In normal seawater temperature and salinity and at 55 BAR the SW30 series of membranes will produce:

o   SW30 2521 = 47 liters/hour or 3*47 = 141 liters/hour

o   SW30 2540 = 109 liters/hour or 2*109 = 218 liters/hour

·        Obviously the production rate with pressure set inside the Green Bar (60-65 BAR), will be greater than the above

·        Dialing back the pressure to change the product water production to the original specs of the watermaker may cause the water maker to shut down.

My statement of reducing the pressure to set the produced water in the sight-glass at the original output for the D50/60, D100, and D160 is no longer valid for normal water temperature and salinity. And the D160 with new membranes will produce over 200 liters/hour.

 

WARNING: Filmtec has increased the efficiency of these membranes and depending on the age of your membrane(s) you may not see the increased production.


I attach the Filmtec Spec Sheet that I refer to:



I hope this helps and clears up things.


Bill

CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


Thomas Peacock
 

This is not an area of expertise for me. However, I would like to either make a couple of points or ask of couple of questions, depending on my depth of knowledge.

The Dessalator manual mentions not to run in water less salty than normal ocean water. However, a member of this forum, name escapes me, stated that you could run in brackish water so long as you did not exceed the water production rate, which for me is 60 liters per hour. My theory on why was that either high pressures, or high water production rate was potentially harmful to the membranes. Is this correct?

Thanks

Tom Peacock
SM 240 Aletes
Chesapeake Bay

On Sep 9, 2020, at 3:23 PM, CW Bill Rouse <brouse@...> wrote:

Mat,

Not according to Dessalator who states that the green bar on their high-pressure gauge is set for between 60 - 65 BAR. And according to Filmtec the Maximum operating pressure is 69 BAR

<image.png>
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 2:17 PM Matt Salatino via groups.io <helmsmatt=yahoo.com@groups.io> wrote:
Won’t running over 56-58 bar affect the membrane life?
Off hand do you know the pressure range specs for the membrane?
I run ours at the low end of the green, thinking I’m being safe.
~~~⛵️~~~Matt

On Sep 9, 2020, at 8:49 PM, CW Bill Rouse <brouse@...> wrote:

I learned something today with from a great 54 owner, from Dessalator, and from reading the recent specifications sheet for Filmtec SW30 membranes.
·        The actual pressure for the Green Zone on a Dessalator high-pressure gauge is between 60 and 65 BAR
·        In normal seawater temperature and salinity and at 55 BAR the SW30 series of membranes will produce:
o   SW30 2521 = 47 liters/hour or 3*47 = 141 liters/hour
o   SW30 2540 = 109 liters/hour or 2*109 = 218 liters/hour
·        Obviously the production rate with pressure set inside the Green Bar (60-65 BAR), will be greater than the above
·        Dialing back the pressure to change the product water production to the original specs of the watermaker may cause the water maker to shut down.
My statement of reducing the pressure to set the produced water in the sight-glass at the original output for the D50/60, D100, and D160 is no longer valid for normal water temperature and salinity. And the D160 with new membranes will produce over 200 liters/hour.

 

WARNING: Filmtec has increased the efficiency of these membranes and depending on the age of your membrane(s) you may not see the increased production.

I attach the Filmtec Spec Sheet that I refer to:



I hope this helps and clears up things.

Bill
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar




--
Tom Peacock
SM 240 Aletes
Chesapeake Bay


 

Tom,

Filmtec states the following about the SW30 2540 membrane, "This membrane is rated for a maximum 700 gallons per day, we use it in our watermakers to produce actual 21 gallons per hour from standard seawater (35000 ppm). In brackish water, freshwater production will increase but you should not exceed 30 gallons per hour or 700 gallons per day."

So, I believe that if you turn the pressure down so that the flow rate does not exceed the rating for the sum of the flow rates of your membrane array, you'll be doing exactly what Filmtec states above.

Here are the flow rates of common SW30 membranes:
image.png
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 3:12 PM Thomas Peacock <peacock8491@...> wrote:
This is not an area of expertise for me. However, I would like to either make a couple of points or ask of couple of questions, depending on my depth of knowledge.

The Dessalator manual mentions not to run in water less salty than normal ocean water. However, a member of this forum, name escapes me, stated that you could run in brackish water so long as you did not exceed the water production rate, which for me is 60 liters per hour. My theory on why was that either high pressures, or high water production rate was potentially harmful to the membranes. Is this correct?

Thanks

Tom Peacock
SM 240 Aletes
Chesapeake Bay

On Sep 9, 2020, at 3:23 PM, CW Bill Rouse <brouse@...> wrote:

Mat,

Not according to Dessalator who states that the green bar on their high-pressure gauge is set for between 60 - 65 BAR. And according to Filmtec the Maximum operating pressure is 69 BAR

<image.png>
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 2:17 PM Matt Salatino via groups.io <helmsmatt=yahoo.com@groups.io> wrote:
Won’t running over 56-58 bar affect the membrane life?
Off hand do you know the pressure range specs for the membrane?
I run ours at the low end of the green, thinking I’m being safe.
~~~⛵️~~~Matt

On Sep 9, 2020, at 8:49 PM, CW Bill Rouse <brouse@...> wrote:

I learned something today with from a great 54 owner, from Dessalator, and from reading the recent specifications sheet for Filmtec SW30 membranes.
·        The actual pressure for the Green Zone on a Dessalator high-pressure gauge is between 60 and 65 BAR
·        In normal seawater temperature and salinity and at 55 BAR the SW30 series of membranes will produce:
o   SW30 2521 = 47 liters/hour or 3*47 = 141 liters/hour
o   SW30 2540 = 109 liters/hour or 2*109 = 218 liters/hour
·        Obviously the production rate with pressure set inside the Green Bar (60-65 BAR), will be greater than the above
·        Dialing back the pressure to change the product water production to the original specs of the watermaker may cause the water maker to shut down.
My statement of reducing the pressure to set the produced water in the sight-glass at the original output for the D50/60, D100, and D160 is no longer valid for normal water temperature and salinity. And the D160 with new membranes will produce over 200 liters/hour.

 

WARNING: Filmtec has increased the efficiency of these membranes and depending on the age of your membrane(s) you may not see the increased production.

I attach the Filmtec Spec Sheet that I refer to:



I hope this helps and clears up things.

Bill
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar




--
Tom Peacock
SM 240 Aletes
Chesapeake Bay


 

Tom,

I am sorry, I said Filmtec. This quote was from another water maker using Filmtec membranes. You will find it here:

Bill
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 3:41 PM CW Bill Rouse via groups.io <brouse=gmail.com@groups.io> wrote:
Tom,

Filmtec states the following about the SW30 2540 membrane, "This membrane is rated for a maximum 700 gallons per day, we use it in our watermakers to produce actual 21 gallons per hour from standard seawater (35000 ppm). In brackish water, freshwater production will increase but you should not exceed 30 gallons per hour or 700 gallons per day."

So, I believe that if you turn the pressure down so that the flow rate does not exceed the rating for the sum of the flow rates of your membrane array, you'll be doing exactly what Filmtec states above.

Here are the flow rates of common SW30 membranes:
image.png
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 3:12 PM Thomas Peacock <peacock8491@...> wrote:
This is not an area of expertise for me. However, I would like to either make a couple of points or ask of couple of questions, depending on my depth of knowledge.

The Dessalator manual mentions not to run in water less salty than normal ocean water. However, a member of this forum, name escapes me, stated that you could run in brackish water so long as you did not exceed the water production rate, which for me is 60 liters per hour. My theory on why was that either high pressures, or high water production rate was potentially harmful to the membranes. Is this correct?

Thanks

Tom Peacock
SM 240 Aletes
Chesapeake Bay

On Sep 9, 2020, at 3:23 PM, CW Bill Rouse <brouse@...> wrote:

Mat,

Not according to Dessalator who states that the green bar on their high-pressure gauge is set for between 60 - 65 BAR. And according to Filmtec the Maximum operating pressure is 69 BAR

<image.png>
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 2:17 PM Matt Salatino via groups.io <helmsmatt=yahoo.com@groups.io> wrote:
Won’t running over 56-58 bar affect the membrane life?
Off hand do you know the pressure range specs for the membrane?
I run ours at the low end of the green, thinking I’m being safe.
~~~⛵️~~~Matt

On Sep 9, 2020, at 8:49 PM, CW Bill Rouse <brouse@...> wrote:

I learned something today with from a great 54 owner, from Dessalator, and from reading the recent specifications sheet for Filmtec SW30 membranes.
·        The actual pressure for the Green Zone on a Dessalator high-pressure gauge is between 60 and 65 BAR
·        In normal seawater temperature and salinity and at 55 BAR the SW30 series of membranes will produce:
o   SW30 2521 = 47 liters/hour or 3*47 = 141 liters/hour
o   SW30 2540 = 109 liters/hour or 2*109 = 218 liters/hour
·        Obviously the production rate with pressure set inside the Green Bar (60-65 BAR), will be greater than the above
·        Dialing back the pressure to change the product water production to the original specs of the watermaker may cause the water maker to shut down.
My statement of reducing the pressure to set the produced water in the sight-glass at the original output for the D50/60, D100, and D160 is no longer valid for normal water temperature and salinity. And the D160 with new membranes will produce over 200 liters/hour.

 

WARNING: Filmtec has increased the efficiency of these membranes and depending on the age of your membrane(s) you may not see the increased production.

I attach the Filmtec Spec Sheet that I refer to:



I hope this helps and clears up things.

Bill
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar




--
Tom Peacock
SM 240 Aletes
Chesapeake Bay


David Wallace
 

If upping the pressure above 800 psi I would first make sure that the pressure vessel and the end cap seals are able to withstand the higher pressure.

Dave Wallace
sv Air Ops
Maramu#104


On Sep 9, 2020, at 1:46 PM, CW Bill Rouse <brouse@...> wrote:


Tom,

I am sorry, I said Filmtec. This quote was from another water maker using Filmtec membranes. You will find it here:

Bill
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 3:41 PM CW Bill Rouse via groups.io <brouse=gmail.com@groups.io> wrote:
Tom,

Filmtec states the following about the SW30 2540 membrane, "This membrane is rated for a maximum 700 gallons per day, we use it in our watermakers to produce actual 21 gallons per hour from standard seawater (35000 ppm). In brackish water, freshwater production will increase but you should not exceed 30 gallons per hour or 700 gallons per day."

So, I believe that if you turn the pressure down so that the flow rate does not exceed the rating for the sum of the flow rates of your membrane array, you'll be doing exactly what Filmtec states above.

Here are the flow rates of common SW30 membranes:
<image.png>

CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 3:12 PM Thomas Peacock <peacock8491@...> wrote:
This is not an area of expertise for me. However, I would like to either make a couple of points or ask of couple of questions, depending on my depth of knowledge.

The Dessalator manual mentions not to run in water less salty than normal ocean water. However, a member of this forum, name escapes me, stated that you could run in brackish water so long as you did not exceed the water production rate, which for me is 60 liters per hour. My theory on why was that either high pressures, or high water production rate was potentially harmful to the membranes. Is this correct?

Thanks

Tom Peacock
SM 240 Aletes
Chesapeake Bay

On Sep 9, 2020, at 3:23 PM, CW Bill Rouse <brouse@...> wrote:

Mat,

Not according to Dessalator who states that the green bar on their high-pressure gauge is set for between 60 - 65 BAR. And according to Filmtec the Maximum operating pressure is 69 BAR

<image.png>
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 2:17 PM Matt Salatino via groups.io <helmsmatt=yahoo.com@groups.io> wrote:
Won’t running over 56-58 bar affect the membrane life?
Off hand do you know the pressure range specs for the membrane?
I run ours at the low end of the green, thinking I’m being safe.
~~~⛵️~~~Matt

On Sep 9, 2020, at 8:49 PM, CW Bill Rouse <brouse@...> wrote:

I learned something today with from a great 54 owner, from Dessalator, and from reading the recent specifications sheet for Filmtec SW30 membranes.
·        The actual pressure for the Green Zone on a Dessalator high-pressure gauge is between 60 and 65 BAR
·        In normal seawater temperature and salinity and at 55 BAR the SW30 series of membranes will produce:
o   SW30 2521 = 47 liters/hour or 3*47 = 141 liters/hour
o   SW30 2540 = 109 liters/hour or 2*109 = 218 liters/hour
·        Obviously the production rate with pressure set inside the Green Bar (60-65 BAR), will be greater than the above
·        Dialing back the pressure to change the product water production to the original specs of the watermaker may cause the water maker to shut down.
My statement of reducing the pressure to set the produced water in the sight-glass at the original output for the D50/60, D100, and D160 is no longer valid for normal water temperature and salinity. And the D160 with new membranes will produce over 200 liters/hour.

 

WARNING: Filmtec has increased the efficiency of these membranes and depending on the age of your membrane(s) you may not see the increased production.

I attach the Filmtec Spec Sheet that I refer to:



I hope this helps and clears up things.

Bill
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar




--
Tom Peacock
SM 240 Aletes
Chesapeake Bay


Craig Briggs
 

HI Tom,
I think I'm the guy whose name escaped you. No problem - it's not the first time ;-)

I posted a while ago that the belief you cannot run in brackish water is a long standing "old wives tale" about water makers. I said one should simply not exceed the fresh water flow rate of your membrane. My post went on to assert your membrane will even be happy running in the fresh water of, say, the US Great Lakes or up the Guadiana River between Portugal and Spain.

The Dessalator manual saying only to use it in "normal ocean water" (whatever that is) is obviously written that way because their equipment uses a "Green Zone" which is calibrated for "normal" ocean water and they do not want to address any other usage scenarios for legal protection.  It is similar to car makers eliminating gauges in favor of "Idiot lights". 

So, yes, you are totally correct in your theory that high pressures which would give a (TOO) high production rate is (definitely) harmful to the membranes. And that is easier to do in low salinity water if you are not monitoring the flow rate, but only looking at the "Green Zone". 

-- SN68 Sangaris, Tropic Isle Harbor, FL


Patrick McAneny
 

Tom, Another owner posted a youtube video ,where a major manufacturer ,it may have been Spectra ,but not positive answered that question . He said as long as you are careful not to exceed the max psi ,it is fine to use in fresh water. He suggested to keep it a little lower and warned that it will get up to max more quickly. Being in fresh water and wanting to operate the W/M before leaving for the islands ,I called him to confirm this. He said that he has many operating on  the Great Lakes and other inland waters. If you search youtube you may find it.
Pat
SM Shenanigans


-----Original Message-----
From: Thomas Peacock <peacock8491@...>
To: main@amelyachtowners.groups.io <main@AmelYachtOwners.groups.io>
Sent: Wed, Sep 9, 2020 4:11 pm
Subject: Re: [AmelYachtOwners] Dessalator Watermakers & Filmtec Membranes

This is not an area of expertise for me. However, I would like to either make a couple of points or ask of couple of questions, depending on my depth of knowledge.

The Dessalator manual mentions not to run in water less salty than normal ocean water. However, a member of this forum, name escapes me, stated that you could run in brackish water so long as you did not exceed the water production rate, which for me is 60 liters per hour. My theory on why was that either high pressures, or high water production rate was potentially harmful to the membranes. Is this correct?

Thanks

Tom Peacock
SM 240 Aletes
Chesapeake Bay

On Sep 9, 2020, at 3:23 PM, CW Bill Rouse <brouse@...> wrote:

Mat,

Not according to Dessalator who states that the green bar on their high-pressure gauge is set for between 60 - 65 BAR. And according to Filmtec the Maximum operating pressure is 69 BAR

<image.png>
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Wed, Sep 9, 2020 at 2:17 PM Matt Salatino via groups.io <helmsmatt=yahoo.com@groups.io> wrote:
Won’t running over 56-58 bar affect the membrane life?
Off hand do you know the pressure range specs for the membrane?
I run ours at the low end of the green, thinking I’m being safe.
~~~⛵️~~~Matt

On Sep 9, 2020, at 8:49 PM, CW Bill Rouse <brouse@...> wrote:

I learned something today with from a great 54 owner, from Dessalator, and from reading the recent specifications sheet for Filmtec SW30 membranes.
·        The actual pressure for the Green Zone on a Dessalator high-pressure gauge is between 60 and 65 BAR
·        In normal seawater temperature and salinity and at 55 BAR the SW30 series of membranes will produce:
o   SW30 2521 = 47 liters/hour or 3*47 = 141 liters/hour
o   SW30 2540 = 109 liters/hour or 2*109 = 218 liters/hour
·        Obviously the production rate with pressure set inside the Green Bar (60-65 BAR), will be greater than the above
·        Dialing back the pressure to change the product water production to the original specs of the watermaker may cause the water maker to shut down.
My statement of reducing the pressure to set the produced water in the sight-glass at the original output for the D50/60, D100, and D160 is no longer valid for normal water temperature and salinity. And the D160 with new membranes will produce over 200 liters/hour.
 
WARNING: Filmtec has increased the efficiency of these membranes and depending on the age of your membrane(s) you may not see the increased production.

I attach the Filmtec Spec Sheet that I refer to:


I hope this helps and clears up things.

Bill
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar




--
Tom Peacock
SM 240 Aletes
Chesapeake Bay


Sv Garulfo
 



141L/h for the Duo100? I’ve never experienced that, even with brand new (2017) membranes at 500h operation in the Med or during the following 400h of operation in the Atlantic tropics and the Pacific tropics. 

We carefully monitor production and with pressure set at the lower end of the green zone, the flow-meter points to 75L/h and the actual production rate (at least according to the Amel fresh water tank floating gauge) is ~80L/h. 
If i push the pressure to the middle of the green zone, I can get the flow meter to read 100L/h but i was under the impression (and instruction from previous owner) that the safer pressure was at the bottom of the green zone. 

Am i missing something? I’d love 141L/h. (Maybe our freshwater tank is bigger than the gauge thinks 😜)


Thanks 
Thomas 
A54-122
Bora-Bora 




On Wed, 9 Sep 2020 at 08:50, CW Bill Rouse <brouse@...> wrote:

I learned something today with from a great 54 owner, from Dessalator, and from reading the recent specifications sheet for Filmtec SW30 membranes.

·        The actual pressure for the Green Zone on a Dessalator high-pressure gauge is between 60 and 65 BAR

·        In normal seawater temperature and salinity and at 55 BAR the SW30 series of membranes will produce:

o   SW30 2521 = 47 liters/hour or 3*47 = 141 liters/hour

o   SW30 2540 = 109 liters/hour or 2*109 = 218 liters/hour

·        Obviously the production rate with pressure set inside the Green Bar (60-65 BAR), will be greater than the above

·        Dialing back the pressure to change the product water production to the original specs of the watermaker may cause the water maker to shut down.

My statement of reducing the pressure to set the produced water in the sight-glass at the original output for the D50/60, D100, and D160 is no longer valid for normal water temperature and salinity. And the D160 with new membranes will produce over 200 liters/hour.

 

WARNING: Filmtec has increased the efficiency of these membranes and depending on the age of your membrane(s) you may not see the increased production.


I attach the Filmtec Spec Sheet that I refer to:



I hope this helps and clears up things.


Bill


Craig Briggs
 

Hi Pat,
If you run 800 psi in fresh water you will definitely damage your membrane. You want to limit the product water flow to that rated for the membrane in terms of LPH or GPH, definitely not the 800 +/- PSI for ocean water.  
Your sentence about "keep it a little lower and warning that it will get up to "max" more quickly" is telling - "max" is the maximum flow for the membrane, and that is reached at very low pressure in fresh water. The words "keep it a little lower" are hugely understated, as 200-300 psi is typically the fresh water range.  Actually, household RO systems operate without any pump at all, just the water service pressure in the range of 35 psi or so. 
--
SN68 Sangaris, Tropic Isle Harbor, FL


Patrick McAneny
 

Craig, I should not have used psi to convey what I meant, I always operate my W/M  at the low end of the green zone in salt water, and in fresh water the couple of times I have ran it just to be sure it was functional ,I kept the pressure slightly below the green zone. I don't even know what the psi is at the green zone . I just made sure that it did not go into the green or exceed normal water production level. Once again I only ran it for a short period to confirm functionality .
It obviously takes less psi to push fresh water thru the membranes and that is what I was trying to convey and was warned about by the manufacturer. Having said that ,he said providing you don't exceed the pressure limits ,it was fine to use your W/M in fresh water ,and many do.
Thanks,
Pat


-----Original Message-----
From: Craig Briggs via groups.io <sangaris@...>
To: main@AmelYachtOwners.groups.io
Sent: Thu, Sep 10, 2020 1:13 am
Subject: Re: [AmelYachtOwners] Dessalator Watermakers & Filmtec Membranes

Hi Pat,
If you run 800 psi in fresh water you will definitely damage your membrane. You want to limit the product water flow to that rated for the membrane in terms of LPH or GPH, definitely not the 800 +/- PSI for ocean water.  
Your sentence about "keep it a little lower and warning that it will get up to "max" more quickly" is telling - "max" is the maximum flow for the membrane, and that is reached at very low pressure in fresh water. The words "keep it a little lower" are hugely understated, as 200-300 psi is typically the fresh water range.  Actually, household RO systems operate without any pump at all, just the water service pressure in the range of 35 psi or so. 
--
SN68 Sangaris, Tropic Isle Harbor, FL