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:
Industrial Training School - Main Distant Learning
 

Poppy   Steam Forum  

FAC

Wednesday, March 14, 2018   By: MM [2231] 0 Stars
Hello,

We recently experinced some leakage in one of our low pressure heaters. Please could someone have a look at the photo and confirm if it looks to be a case of FAC?

Thanks!

PicturePicturePicture

Click on picture for full size view or to view PDF!

Post a Reply...
Viewed 204 times

Wednesday, March 14, 2018   By: Murphy [21] 4 Stars
Although a photo or picture is worth a thousand words, your photos dont show FAC or flow assist corrosion at this level of magnification. If your tubes are leaking they maybe from FAC on the shell side, but you will have to have the leaky tubes removed for a closer eval.

Murphy

Post a Reply...
Viewed 185 times

Sunday, March 18, 2018   By: basem belal [2194] 1 Stars
your photos refer to good situation of tubes, but this is not the case to take a decision from theses photos.
I tested a leakage case in low pressure heaters in a 660 MW power plant, the reason was very clear for us that there was small air leak into the condenser causes increasing in solved gases in condensate water and last one lead to tube failure of low pressure heater.
hope I helped you in my answer

Post a Reply...
Viewed 153 times

Sunday, March 18, 2018   By: Ross Burns [390] 5 Stars
Excellent responses to your question on flow assist corrosion or generically Erosion-Corrsion.

Erosion-Corrosion is a form of corrosion where the corrosion is accelerated by fluid flow.

Condenser tubes have experienced this based on my knowledge, but the cause is the result of the coolant flow at high flow rates like 5 ft per sec or more, and when the flow is above 10 or 15 ft per sec flow the rate then the failure is in days, and this would be say using Admiralty Brass. Also, the saltwater has to be corrosive enough when the passive protective layer is removed on the Admiralty Brass.

So, when the corrosion protective film get broken down from the high flow or high velocity of the coolant, then we are going to experience erosion-corrosion of tubing in a shell and tube heat exchanger. When the tubing is removed, then we can see the damage with the naked-eye.

In a heat exchanger such as a feedwater heater the tube are long enough so laminar flow is unlikely at some length down the tube, so turbulent flow is likely, but that does not mean high-velocity flow. However turbulent flow is a cause for erosion-corrosion in the event the coolant is corrosive at some level. So, we have to keep this in mind.

From the steam side the erosion-corrosion can occur from steam condensate impingement.

Unfortunately, the photos are really nice, but they are unhelpful in determining your erosion-corrosion, which is also called flow assisted corrosion or FAC.

Ross Burns

Post a Reply...
Viewed 149 times

Published on steamforum.com

 

Featured
superheated steam ideal gas
By: cmolanes@itba.edu.ar [50]

Mr. Pradeep:

Steam behaves well as an ideal gas if not too close to the saturation line if you place yourself on a Mollier chart, when the temperature and enthalpy lines coincide and are straight, horizontal lines, then it behaves as ideal, and this you can easily see on the chart.

I would rely though most on the steam values given by the chart or steam tables, because they are confident independently of the region , e.g. they stand both for ideal and real gas, but the ideal gas equation ....   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.

About 2/3 of internet traffic is useless traffic and consist of malicous-bad-robots.  However, there are good robots too.  We block bad-robots, and allow the good one's through, but we just do not count the good one's.  We want good straight-brand impressions for our advertisers!

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 Nationawide Boiler and they are the first to provide a 1000-BHP trailer mobile rental unit using a Superior Boiler.  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.

 

 

 

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
 
Industrial Training School - Maintenance
 
Industrial Training School
 
National Assoc of Stationary Operating Engineers
 
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