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Re: Dp cooling

[email protected]
 

?Hello Vladimir,


I am all right! Hope you too! Well the things goes well here. Few weeks ago I just installed a new DP in my system. This is a VHS-4 from Varian. I was expecting better pumping speed, because the VHS-4 is capable up to 1200 L/sec. But some way that was not so enomorus change. The manufacturer advice for the inlet water temperature 15-20 celsius and for the outlet maximum 49 celsius at 0.15 gpm flow. So my DP is cooler than this.


One more interesting phenomenon was, I used Santovac 5 in this DP, but that was no difference between the performance when the Apiezon AP201 was in the pump.With the AP oil the pumping speed was better! Actually I checked at the bottom the boiler temperature. Using Santovac 5 that was 215 celsius, using AP201 that was 170 celsius. The latter is good for that fluid, but the 215 celsius is too low for the Santovac 5. I dismantled the DP and I recognised the uppermost top jet was dry no oil on the inner surface, and the second from the top was same. So I guess the pump was not enough hot.


Later I red that the VHS-4 was designed for silicon oils. So I decided to buy DC704 or equvivalent oil, and put a regulation valve in the feeder water line and a flow meter in the return water line. and just adjust the flow and than check the outlet temperature of the water not let hotter than 35 celsius or so.


For my IBAD application and DP the DC702 and DC704 oil is better than the Santovac 5.DC705 was also not suggested? for this pump.


Thanks a lot!


Best Rergards!


Attila



---In VacuumX@..., <chutko@...> wrote:

Hi Attila,

How are you? Hope everything is OK at your end. I didn't work with DP last 20 years, however I remember that overcooled water is also not good for DP because it leads to lower pumping speed and higher ultimate pressure. In case of too cool water you need to increase the heater power. Manufacturers usually recommend optimal inlet and outlet water temperature values. For instance, Leybold recommends inlet water temperature no more than 25C and outlet water temperature 30C, but they do not say anything about minimal values (but those values are different for different pumps and brands). As far as I remember, we always installed the control water valve and controlled water flow to get an optimal temperature by lowest ultimate vacuum and fast pumping speed.

Do not forget, the cooling water must flow from the top input flange or baffle to the bottom output? flange.

Best regards,

Vladimir

On 11/22/2013 1:39 PM, schneyolo@... wrote:
Hello,

I have (maybe a dummy ) question to the DP cooling. In many manuals are written about what if the cooling is not sufficient enough. But nowhere I have seen what happends if the coolig is too eccessive. For example, the cooling water flow is too high and the return line water is cold. In my case the inlet temperature of the cooling water is 15 celsius, the return is max. 25 celsius, but often 21-23 celsius. I don't know the water flow , but it is surlely more than 0.15 gpm, which is the reccondended by the manufacturer. I read somewhere if the DP wall is too cold, than the oil cannot flow back enough fast and that slows the punping speed and lowers the fluid level in the pump.

So if I overcool my? DP, what happens? Slower pumping speed, at gas load, slower pump down? and/or higher base pressure, cannot reach the ultimate pressure of the system?

Any comments?

Regards
Attila

Re: Dp cooling

 

开云体育

Hi Attila,

How are you? Hope everything is OK at your end. I didn't work with DP last 20 years, however I remember that overcooled water is also not good for DP because it leads to lower pumping speed and higher ultimate pressure. In case of too cool water you need to increase the heater power. Manufacturers usually recommend optimal inlet and outlet water temperature values. For instance, Leybold recommends inlet water temperature no more than 25C and outlet water temperature 30C, but they do not say anything about minimal values (but those values are different for different pumps and brands). As far as I remember, we always installed the control water valve and controlled water flow to get an optimal temperature by lowest ultimate vacuum and fast pumping speed.

Do not forget, the cooling water must flow from the top input flange or baffle to the bottom output? flange.

Best regards,

Vladimir

On 11/22/2013 1:39 PM, schneyolo@... wrote:

Hello,

I have (maybe a dummy ) question to the DP cooling. In many manuals are written about what if the cooling is not sufficient enough. But nowhere I have seen what happends if the coolig is too eccessive. For example, the cooling water flow is too high and the return line water is cold. In my case the inlet temperature of the cooling water is 15 celsius, the return is max. 25 celsius, but often 21-23 celsius. I don't know the water flow , but it is surlely more than 0.15 gpm, which is the reccondended by the manufacturer. I read somewhere if the DP wall is too cold, than the oil cannot flow back enough fast and that slows the punping speed and lowers the fluid level in the pump.

So if I overcool my? DP, what happens? Slower pumping speed, at gas load, slower pump down? and/or higher base pressure, cannot reach the ultimate pressure of the system?

Any comments?

Regards
Attila

Re: Dp cooling

 

开云体育

I'd agree with Dave.

One consideration, from a costs point of view, excessive water flow means (unless you recycle your coolant, or are on your own water supply) a higher than necessary water bill. Just a thought......

Cheers, Thomas J.

On 23/11/2013 8:01 AM, David Speck wrote:

?

Attila,

As long as your DP oil is not freezing and sticking to the sides of the line, I don't think you can have it "too cold".?

Dave

On 11/22/2013 4:39 PM, schneyolo@... wrote:
Hello,

I have (maybe a dummy ) question to the DP cooling. In many manuals are written about what if the cooling is not sufficient enough. But nowhere I have seen what happends if the coolig is too eccessive. For example, the cooling water flow is too high and the return line water is cold. In my case the inlet temperature of the cooling water is 15 celsius, the return is max. 25 celsius, but often 21-23 celsius. I don't know the water flow , but it is surlely more than 0.15 gpm, which is the reccondended by the manufacturer. I read somewhere if the DP wall is too cold, than the oil cannot flow back enough fast and that slows the punping speed and lowers the fluid level in the pump.

So if I overcool my? DP, what happens? Slower pumping speed, at gas load, slower pump down? and/or higher base pressure, cannot reach the ultimate pressure of the system?

Any comments?

Regards
Attila


Re: Dp cooling

 

开云体育

Attila,

As long as your DP oil is not freezing and sticking to the sides of the line, I don't think you can have it "too cold".?

Dave

On 11/22/2013 4:39 PM, schneyolo@... wrote:

Hello,

I have (maybe a dummy ) question to the DP cooling. In many manuals are written about what if the cooling is not sufficient enough. But nowhere I have seen what happends if the coolig is too eccessive. For example, the cooling water flow is too high and the return line water is cold. In my case the inlet temperature of the cooling water is 15 celsius, the return is max. 25 celsius, but often 21-23 celsius. I don't know the water flow , but it is surlely more than 0.15 gpm, which is the reccondended by the manufacturer. I read somewhere if the DP wall is too cold, than the oil cannot flow back enough fast and that slows the punping speed and lowers the fluid level in the pump.

So if I overcool my? DP, what happens? Slower pumping speed, at gas load, slower pump down? and/or higher base pressure, cannot reach the ultimate pressure of the system?

Any comments?

Regards
Attila

Dp cooling

[email protected]
 

Hello,

I have (maybe a dummy ) question to the DP cooling. In many manuals are written about what if the cooling is not sufficient enough. But nowhere I have seen what happends if the coolig is too eccessive. For example, the cooling water flow is too high and the return line water is cold. In my case the inlet temperature of the cooling water is 15 celsius, the return is max. 25 celsius, but often 21-23 celsius. I don't know the water flow , but it is surlely more than 0.15 gpm, which is the reccondended by the manufacturer. I read somewhere if the DP wall is too cold, than the oil cannot flow back enough fast and that slows the punping speed and lowers the fluid level in the pump.

So if I overcool my? DP, what happens? Slower pumping speed, at gas load, slower pump down? and/or higher base pressure, cannot reach the ultimate pressure of the system?

Any comments?

Regards
Attila
Does anyone recognize this pump?

 

I was wondering if anyone here knows anything about this pump I can not identify it?<br><br>Monroe King
Alcatel 2004A

 

Hi

Does someone know how to repair a Alcatel 2004A pomp.
regards
Paul
Re: ed ward

 



Best regards, ed ward
hi!

 
















































































































































rocky_beech
Russ Thornton
****
Come, let us hasten to a higher plane, Where dyads tread the fairy fields of Venn, Their indices bedecked from one to n, Commingled in an endless Markov chain -- Stanislaw Lem (Cyberiad)
%

hi!

 
















































































































































rocky_beech
Russ Thornton
****
Come, let us hasten to a higher plane, Where dyads tread the fairy fields of Venn, Their indices bedecked from one to n, Commingled in an endless Markov chain -- Stanislaw Lem (Cyberiad)
%

Re: procedures for aluminization

 

This time I'll actually include a link so that you can see the file:
https://docs.google.com/file/d/0B1ZJFar_AuNBb2FURFFWd2t6YTA/edit?usp=sharing
or
http://tinyurl.com/c9775uh
?
Guy Brandenburg, Washington, DC?
http://gfbrandenburg.wordpress.com/
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
============================
From: Guy Brandenburg

procedures for aluminization

 

Here is my writeup on how to aluminize mirrors using our setup. No photos yet. Any comments welcome.
?
Guy Brandenburg, Washington, DC?
http://gfbrandenburg.wordpress.com/
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
============================
Diavac doc help

rydel_charles
 

Hi,

I am in search of the doc & shematics of the Diavac Penning & Pirani Jauge CT-2P & PT-9P. Does spmebody have it ?

Thanks in advance,

Charles Rydel
Re: Vacuum hoses?

Gomez Addams
 

Duniway, usually.

On Mar 5, 2013, at 8:25 PM, Guy Brandenburg wrote:

Where do y'all get your flexible vacuum hoses from these days?


------------------------------------

Yahoo! Groups Links



- Bill "Gomez" Lemieux,
The Highland Tinker
Granville Phillips 260 Ion Gauge Controller

 

I decided to provide information that may be some help to someone. I recently purchased a Granville Phillips 260 ion gauge controller for very cheap from Ebay; when tested the filament would not engage. The instruction manual was down loaded from Ideal Vacuum :

Looking at FIG 4-3 Q8 drives the magnetic latching relay K3 when closed applies power to the filament. C2 stores energy so that when momentary switch S2 is engaged; C2 keeps Q* turned on long enough to allow time for the relay to latch. C2 in my case was weak; when it was replaced the filament circuit worked. The controller was tested with my diffusion pump system more or less agreeing with my old CVC controller.
Re: Vacuum hoses?

 

Ebay....? Business and Industrial category

"stainless steel vacuum hose"? will get you in the zone for finding them.? also try leaving off the stainless steel.? It will generate more hits that you have to sort thru but you may find a good buy.?

Drew in sunny Florida

---------------------------------------------------------------------- ?


On Tue, Mar 5, 2013 at 10:25 PM, Guy Brandenburg <gfbrandenburg@...> wrote:
?

Where do y'all get your flexible vacuum hoses from these days?
Vacuum hoses?

 

Where do y'all get your flexible vacuum hoses from these days?
Re: Edwards ED200 Vacuum Pump

 

开云体育

Thank you Vaughn, much appreciated. I'd still like to get a manual / Instructions if possible but this gives me some details.

Don Black.

On 06-Mar-13 10:26 AM, Vaughn Mcdowell wrote:

?
try this link:

From: donblack1au
To: VacuumX@...
Sent: Tuesday, March 5, 2013 6:34 AM
Subject: [VacuumX] Edwards ED200 Vacuum Pump

?
Hello, does anyone have any information about the Edwards ED200 vacuum pump please. I'd like a manual, instructions, any information I can get please.
Thank you, Don Black.
Re: Edwards ED200 Vacuum Pump

 

try this link: http://scientific.se-source.com/items_v_w_x_y_z/V63.htm

From: donblack1au
To: VacuumX@...
Sent: Tuesday, March 5, 2013 6:34 AM
Subject: [VacuumX] Edwards ED200 Vacuum Pump

?
Hello, does anyone have any information about the Edwards ED200 vacuum pump please. I'd like a manual, instructions, any information I can get please.
Thank you, Don Black.
Edwards ED200 Vacuum Pump

 

Hello, does anyone have any information about the Edwards ED200 vacuum pump please. I'd like a manual, instructions, any information I can get please.
Thank you, Don Black.
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