Poppy and the Steam Forum and Power Forum

Welcome to the steam and power forum, a bulletin board dedicated to questions and answers to Steam Plants and Power Generation Plants for steam boilers, turbine generator and heating problems. Dedicated to power plants, power generation, supercritical, and heating plants as well as steam boilers, steam turbine generators, gas turbines or combustion turbines, hrsg, steam heating, pressure vessels, steam line, including ASME questions and more. Remember the forum is made up of volunteers from experts to beginners. Unfortunately, we cannot allow free commercialism that promotes products, services, or sites.
 
The Steam Forum and Power Forum is being sponsored by the following:

Poppy   Steam Forum  

Poor vacuum in my Air Cooled Condenser

Tuesday, April 18, 2017   By: Steve [2140] 0 Stars
Hello, I have an ACC that has 8 cells and I can only achieve 26 of vacuum when I sub cool the unit. I checked the system for leaks with helium and I found and repaired two leaks. I also had my air ejectors inspected and cleaned by the OEM and they were within allowable tolerances. Does anyone have any suggestions what could be the issue. In the past I was able to achieve 29 of vacuum.

Any assistance would be greatly appreciated.

Thank You

Post a Reply...
Viewed 1054 times

Tuesday, April 18, 2017   By: Ross [390] 5 Stars
Hi Steve, well you have a puzzle that may need a few approaches based on information not given. You mentioned you had good vacuum to transform through the latent heat of steam to condensate at one time in the air cooled condensers. Okay, so the design is reasonable.

Do you clean the tubing or fins at regular intervals. If you dont then consider washing with water at under 100psi with a stream of say 1.5 inch fire hose. Detergent is not needed when washing the air cooled condenser.

Second, has the area that surrounds the air cooled condensers changed. Undesirable changes are structures that are now too tall or too close than before.

Are the cooling fans functioning as needed at revolutions specified and required?

Finally, consider an aggressive method for an air leak test by considering a decay test with the steam turbine generator operating. The decay test will revel to you the rate of decay of vacuum, which you will measure, for this must be compared to manufacturers specification. If the rate of vacuum decay is greater and you have already found all the tube leakers in the air cooled condenser then look at or examine your steam turbine gland seal steam system for the culprit.

Good luck
Ross

Post a Reply...
Viewed 1046 times

Wednesday, April 19, 2017   By: steve [2140] 0 Stars
Hello Ross,

thanks your for your reply.

The ACC were washed two months ago by setting up a power washer jig that sprays water at the same angle as the tubes to wash the fins out.

No new structures were installed in the vicinity.

I have my gland sealing steam psi at the highest PSI {10} recommended by the OEM.

again thank you for your assistance.

Post a Reply...
Viewed 1022 times

Wednesday, April 19, 2017   By: Ross [390] 5 Stars
I meant the gland seal system and not just the steam pressure to the steam turbine glands. Not knowing what you have, maybe you have an air leak in the gland seal system which is very likely and should be ruled out. Maybe I am missing something and you do not recover and collect drained condensate from your steam turbine gland seals and vent the air from gland seal system.

Ross

Post a Reply...
Viewed 1026 times

Thursday, April 20, 2017   By: Jim Watts [764] 5 Stars
It is possible the condenser is being required to desuperheat the exhaust steam. This uses up surface area.
The problem arises if the turbine blades have lost efficiency due to fouling and the steam exit temperature rises into the superheat region.
Check the exhaust steam temperature and compare it to the condensate temperature and the saturation temperature from steam tables for the absolute pressure you are reaching.
If the condensate temp matches saturation and steam temp is high your blades are fouled or other turbine problem.
if the steam temp matches saturation and condensate is low, you have air in the condenser.

Post a Reply...
Viewed 1017 times

Published on steamforum.com

 

Featured
Is Cp/Cv applicable to steam to calculate?
By: Kent mayhew [2161]

The reason that isobaric Cp heat capacity is greater than isometric Cv is that isobaric involves expansion. Remember our atmosphere has mass, so in order for a system to expand it must displace that mass. And this requires work. So Cp requires work plus the energy to heat the gas , while Cv only requires the energy to heat.

So for all gases and/or steam the work required to expand a given volume is the same that being the work required to displace our atmosphere by a given volume.

Hence t....   Read All
Advertising Info - Click Here!

It's hard not to look at this ad at least once, then you go to the next page an notice it again. Maybe you will not read the message, but you will be thinking about the brand and we call that brand impressions.

Imagine your static or animated display advertisement placed here, and if that is not enough you can include text too to expound on the virtues of your services and or products.    In addition, you can benefit by using our new advertisement feature to have your video included in your ad space.  Wow, make an infomerical with text and a display by combining all features to enhance the readers or audience's experience using your brand.  Ads can be much more than a static display ad. Here is an example of how your video could be used or position in this ad space:

 

Caption: This public domain video shows from ABB Power Transformers that ABB is a major transformer manufacturer throughout the world. ABB power transformers are built and designed to meet the individual customer's needs. This experienced attendance to details lies behind the success of ABB's transformers. This approach is carried throughout the manufacturing process: design, core, winding, drying, tank, quality assurance, assembly, testing, transport and installation and support. The author of the video is not an advertiser and is being used to show how the video ad can be of value to the reader since you have already being viewing the video.  It is hard not to think about the authors brand after viewing the video ad.  This is the benefit of Branding.

Your advertisement impressions are genuine with removal of bots, crawls or spiders in your impression count, and we take it one step further, for hackers and malicious-padders get excluded when they are identified. 

 

 

A Long-Game that Earns Tomorrow's Sales


Click on this Promotional Advertisement to Contact Us Today!

Good Branding Puts Your Brand or Company in the Front of a Decision-Maker’s Mind for a Purchase either Months from Now or Five-Years in the Future.

Good branding makes your brand or company the leader in a crowded field of other brands or companies vying for your potential or existing client's attention. 

An invitation to the buyer's table to negotiate potential sales from $thousands to $millions of dollars in any of these: Systems sale, Capital Equipment, Upgrades & Modifications,  Repairs, or Capital Project becomes easier now with a recognized brand that thinks forward by brand advertising.

Your advertising will cost you an unbelievable low amount, so ask for our Media Kit that has Specs and Rates. 

Below is some of our demographic data for steam and power forum users will speak for itself:

Bus Sector Percent   Education Percent
Manufacturing 11%   College 51%
Power Gen 20%   Grad School 20%
Chemical & Petroleum 15%      
Medical Facilities 6%      
Pulp & Paper / Forest 7%      
Pharmaceutical 7%      

Our network works hard for you with placements for full coverage on part of the network, or full network placement.  Brand yourself today and don’t miss-out on being invited to your client or future client's table because they forgot you.  Be the leader they will remember and be part of their capital project.  Tomorrow’s clients are your future.

 

Advertising and Marketing Agency for the steam and power forum
PE Marketing, LLC

Branding.jpg

Sponsors/Advertisers
Industrial Training School - Maintenance
 
Industrial Training School - Steel Making Tutorial
 
Confidentiality, Disclaimer; Policy
STEAM and POWER FORUM
© 2001 to Steam Forum, All Rights Reserved.
PE Marketing LLC is representing the steamforum for advertising and marketing
Valid XHTML 1.0 Transitional