Sunday, December 19, 2010

CrazyEngineers Forum

CrazyEngineers Forum

Funky Looking Glass Command Prompt Window On Windows 7, Vista And XP

Posted: 19 Dec 2010 10:01 AM PST

When I was surfing through net, i found this GLASS COMMAND PROMPT.. All those computer lovers who love great visualizations can find this glass cmd prompt from the following link:


Enjoy the new look of your command prompt :p

GRE books

Posted: 19 Dec 2010 06:07 AM PST

Hi friends!

I got some GRE books and i would like to share with you.Hope this will be useful for you!

http://www.mediafire.com/?xnsc3ffg7cpp79v[/URL]

Personality Development!

Posted: 19 Dec 2010 06:05 AM PST

Continued!

Self-Flushing Debris Filter

Posted: 19 Dec 2010 06:04 AM PST

Self-Flushing Debris Filter


The quality of the cooling water intake and the amount of debris in that water affects the operation and performance of the condenser and therefore the thermal performance of the typical steam plant.

Material such as slime, calcium carbonate, calcium sulfate, magnesium dioxide, silt, petroleum products, corrosion products, and the like adhere to the inside of the heat exchanger and condenser tubes. The accumulation and growth of such deposits reduce the overall heat transfer coefficient and will have an adverse effect on the operation of process equipment, plant availability, production, and maintenance cost.

Traditionally, plant maintenance teams isolate and open each heat exchanger or condenser unit periodically in order to clean the tubes manually using high-pressure water jets or mechanical scrapers. This process is labor-intensive, costly, and may require process shutdown. Furthermore, when the equipment returns back to operation, the fouling process begins anew.

there is an online method to clean the heat exchanger or condenser , it is DEBRIS FILTER

Self-Flushing Debris Filter



The debris filter is the ultimate protection for condenser tubes, it is designed to automatically separate and remove fibrous and coarse debris from the cooling water during operation of the cooling system. In order to protect the condenser not only from unwanted particles flushed into the cooling system by the cooling water, but also from particles originating from the cooling water intake channel or pipes themselves, the debris filter should be located as close as practical to the CONDENSER INLET .

Since the debris filter is the last protection in-line of the screening systems in front of the condenser, particular care has been taken to ensure high reliability, availability and performance as well as low maintenance.








Intake screens are often ineffective in protecting heat exchanger tubes from debris. Many plants designed with through-flow traveling screens located upstream of the condenser still experience heavy debris carryover or are victims of macro fouling via mollusk or crustacean growth within the intake tunnel, which causes many clogged condenser tubes. The normal practice is to clean the tubes manually, but this requires an outage or a period at reduced load, depending on the condenser design.

A debris filter or automatic pipe strainers provide the best filtration, ranging from 50 microns to 10 mm. These strainers can be sized to remove the carryover and fine debris that pass through intake screens to prevent buildup inside the condenser or exchanger tubes.


The debris filter replaces a section of the cooling water piping. Water and debris enter into the filter housing, and filtered water exits the screen mesh. Debris larger than the mesh size is trapped over the screen area. Based on the desired setpoint for the increased pressure drop above the clean screen, or on a preset time interval, the debris-cleaning rotor travels over the screen mesh to lift and remove debris from the screen surface. The debris-cleaning cycle lasts only a few minutes. The debris is then discharged into the sewer or into the cooling water discharge from the plant using a small quantity of water.




Fixed, semi-spherical shaped filter elements separate the filter area into several independent filter chambers, and consequently no debris can bypass the filter elements. A hood-shaped backwash rotor, located at the raw water side, always covers one filter chamber completely, while a special engineered gear box actuates and rotates the backwash rotor from the clean water side of the filter. The backwash process is automatically initiated by a pressure differential measuring system which monitors debris accumulation permanently.


Not only can the backwash process be triggered automatically by the pressure differential measuring system, the backwash sequence can also be started manually from the local control cabinet.






This is the typical TECHNOS Self-Flushing Debris Filter , and its components shown in the figure above , this system is installed at Most of Thermal Power Station , for its ultimate benefits and advantages .

The attached files are (*.pdf ) files which describe in detail the debris filter , and TECHNOS Catalog

Condenser Vacuum low reasons

Posted: 19 Dec 2010 06:00 AM PST

Vacuum low reasons:




1. Check condenser surface area, make sure it is clean (you can do inspection for one room while the other still in service and you need to reduce load) this is if possible with your business operations

2. Check for leakage around flanges, gaskets, valves etc, near ejector and condenser

3. Check MP steam pressure which drives the ejector (is it according to the required pressure)??

4. Check ejector drain and steam trap which send the condensate back to condenser (plug-up or not)??

5. Check if someone has opened chest valve / valve after governor drain, maybe drain valve is open instead of steam trap, because condensate which goes back to condenser should pass steam trap, not through drain.

6. Check your vacuum breaker is not in service

7. Check level of condenser, it should be good, and check temperature of cooling water for condenser, it should be low enough to condenser steam.

Personality Development!

Posted: 19 Dec 2010 05:52 AM PST

Interesting videos!

Learning to push your limits!

Earthing File from " SCHNIDER ELECTRIC"

Posted: 19 Dec 2010 04:46 AM PST


Earthing System is very important issue for electrical distribution , so I attached files talking about types of earthing , I hope it benefits you all.



EARTHING_SYSTEMS_PPT


Get Your Short Link With us & Forex market
Get Your Short Link With us & Forex market

< go to the link , the download link will be shown within seconds >


Thermal Power Station , Steam Power Plant , Electricity Production , Operation and Commissioning

Reveres Power Protection., Theory & Setting .

Posted: 19 Dec 2010 04:16 AM PST

Reverse Power Protection.














1- Protection against overspend 32G (# 1).

In case of Turbine Failure, the Turbine is tripped and then the Generator is tripped by operation of reverse power relay to prevent overspending of the Turbine generator unit.


2- Protection against generator motoring 32G (#2).

-Generator motoring protection is designed for the prime mover or the system, rather than for the generator.

- With steam turbines, Turbines will overheat on low steam flow, motoring results from a low input To the Ac Generator,

- When This I/P can't meet all the losses, the deficiency is supplied by absorbing real power from the system.

- since field excitation should remain the same , the same reactive power would flow as before motoring , thus, on motoring the real power will be into the generator, while the reactive power may be either flowing out or into the generator


















Setting of Reverse Power Relays


Data for setting calculations
-Rated Capacity of Generator -------- 440,000 KVA
-No Load Loss of Generator --------- 1,785 KW
-No Load Loss of Turbine ---------- 1,350 KW
-No Load Loss of TG unit ---------- 3,135 KW
-Permissible Motoring Time ------- 60 Sec.
-Relay Constant ------------------- 1 P.U. = Generator KVA






Setting Of Reveres Power Relay 32G ( #1 )


1- Reverse Power Trip Level


Trip Level < No load loss of TG unit * 0.3
= 3,135 * 0.3
= 940.5 KW
Pick up = Trip level / relay constant
= 941 / 440,000
= 0.0021 P.U.
Setting = - 0.002 P.U. ( 880KW )


2- Reverse Power Trip Delay


Trip Delay < Perm. Motoring time (60 Sec.)
Setting = 50 Cycles (1 Sec.)












Setting Of Reveres Power Relay 32G ( #2 )


1- Reverse Power Trip Level


Trip Level < No load loss of TG unit * 0.5
= 3,135 * 0.5
= 1,568 KW
Pick up = Trip level / relay constant
= 1,568 / 440,000
= 0.004 P.U.
Setting = - 0.004 P.U. ( 1,760KW )


2- Reverse Power Trip Delay


Trip Delay < Perm. Motoring time (60 Sec.)
Setting = 750 Cycles (15 Sec.)

Swirling problem at boiler’s start-up

Posted: 19 Dec 2010 03:15 AM PST
At boiler's start-up, one should take care of water swirling at boiler's Drum, especially when you start at Cold Start Mode.
Swirling at cold start, makes water level fluctuates very much at the Drum. Therefore it can trip the boiler with Drum level Hi Hi protection (MFT).
Imagine you have some of water in a kettle, and you start boiling the water, the mixture will be water and bubbles. That is what happened at drum but with so many fluctuations.
Water swirling takes time until water level stabilize, when a build up pressure at Drum equal to 1 barg. You can notice this from the Drum level indicator.
So, how can we eliminate such this problem?



1- Open start up blow off valves ( 2 valves )
2- Open continuous blow down valve ( 1 valve )
3- Reduce warm up fuel flow mass ( rate of fuel )







http://science-hamza.blogspot.com/

Skills Required To Get Selected In MNC Like Infosys?

Posted: 19 Dec 2010 01:36 AM PST

hey friends i wanna know what kind of skills (Technical) are required in person so as to get selected in a big MNC like infy????

And if i know just the basics of something lets say Oracle database is it good to add it in my resume, as i know just the basics???? :happy:

generate electricity while walking

Posted: 19 Dec 2010 01:06 AM PST

can anybudy help me in final year project. I want 2 knw abt its mechanism,hardware, working in detail. If u can plz help me out,u can suggest thro' a video too


Thanx
Regards JRS:confused:

The Power of TeamWork

Posted: 18 Dec 2010 11:04 PM PST

Inspirational:-)

Birth of the Solar System

Posted: 18 Dec 2010 10:54 PM PST

Team Work

Posted: 18 Dec 2010 10:51 PM PST

Out of words!

Fresher salaries equal to or greater than those with 1 year experience in IT

Posted: 18 Dec 2010 10:47 PM PST

I had observed an interesting thing during my tenure as a software engineer with a leading IT company. Many times, the fresh campus recruits were offered salary equal to or even more than that of the employees with 1+ years of experience.

It often led to frustration among the experienced employees that the fresh candidates joining their teams, doing even lesser work were getting paid higher or equally with them.

Has this happened in your company?
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