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Search: Posts Made By: Charbel
Forum: LIVE PLC Questions And Answers January 30th, 2018, 04:38 AM
Replies: 14
Views: 713
Posted By Charbel
I guess better to use PI control for both flow...

I guess better to use PI control for both flow and pressure.
Forum: LIVE PLC Questions And Answers January 30th, 2018, 03:37 AM
Replies: 14
Views: 713
Posted By Charbel
dear lord Farquaad, thanks a lot and yes I...

dear lord Farquaad,

thanks a lot and yes I agree with you, 4.2 LPS was determined by design so this shouldn't be exceeded.

I assume clipping is easy to be done on the flow control to make it...
Forum: LIVE PLC Questions And Answers January 29th, 2018, 11:19 PM
Replies: 14
Views: 713
Posted By Charbel
Thank you, but how to ensure that the control...

Thank you, but how to ensure that the control doesn't fall outside the stated range ( 2.7 LPS to 4.2LPS)
Forum: LIVE PLC Questions And Answers January 29th, 2018, 11:42 AM
Replies: 14
Views: 713
Posted By Charbel
controlling underground pump using level and flow

Dear,

We have a Variable speed pump located in an underground pit, the purpose is to perform the following
1- When the level is high, the pump will need to run at a maximum allowable frequency...
Forum: LIVE PLC Questions And Answers January 22nd, 2018, 04:32 AM
Replies: 21
Views: 1,549
Posted By Charbel
thank you tragically1969!

thank you tragically1969!
Forum: LIVE PLC Questions And Answers January 19th, 2018, 08:26 AM
Replies: 21
Views: 1,549
Posted By Charbel
hi tragically1969, this comparison sheet was...

hi tragically1969,

this comparison sheet was given to me by the contractor to check it, I feel he is cheating.... so I am trying to reply to him and show him that LED are in fact better than LCD
Forum: LIVE PLC Questions And Answers January 19th, 2018, 08:14 AM
Replies: 21
Views: 1,549
Posted By Charbel
dear guys, thank you for your feedback. ...

dear guys,

thank you for your feedback.

I have depicted several advantages of LED over LCD which contradicts with the one indicated in the attached comparison sheet
1- better contrast
2-...
Forum: LIVE PLC Questions And Answers January 19th, 2018, 03:54 AM
Replies: 21
Views: 1,549
Posted By Charbel
is it accurate?, I am more lenient to go with LED

is it accurate?, I am more lenient to go with LED
Forum: LIVE PLC Questions And Answers January 19th, 2018, 03:54 AM
Replies: 21
Views: 1,549
Posted By Charbel
LCD vs LED

Dear,

please see attached comparison sheet by the contractor, I don't find it accurate, please advise, appreciate your feedback.

thank you,

Charbel
Forum: LIVE PLC Questions And Answers January 19th, 2018, 02:31 AM
Replies: 21
Views: 1,549
Posted By Charbel
LCD vs LED

dear,

from performance point of view, which one you think it is better to recommend (not taking into account the price)
to use LCD screens or LED screens?

I believe that LED screens are...
Forum: LIVE PLC Questions And Answers December 12th, 2017, 04:07 AM
Replies: 23
Views: 1,490
Posted By Charbel
230VAC vs 24VDC

Dear,

what is the advantage of using 230VAC over 24VDC for discrete signals (digital input and outputs)

It is well understood that 24VDC is to be used for safety purposes

however, the client...
Forum: LIVE PLC Questions And Answers July 6th, 2017, 11:38 AM
Replies: 1
Views: 420
Posted By Charbel
Chilled water control system

Dear,

I am looking from control point of view for the chilled water control system, is it better to have heat exchanger in the plots? or directly going to the plots?

Chilled water system is...
Forum: LIVE PLC Questions And Answers April 3rd, 2017, 07:24 AM
Replies: 3
Views: 612
Posted By Charbel
dear, yes you are right, but it is not...

dear,

yes you are right, but it is not possible at this stage, I guess I should see what is the common practice and implement it.

thanks for any feedback and guidance,
Forum: LIVE PLC Questions And Answers April 3rd, 2017, 04:46 AM
Replies: 3
Views: 612
Posted By Charbel
flow override

dear,

i wanted to understand something concerning flow override.

usually a irrigation pumping station running based on pressure, which will control the variable speed of the irrigation pump,...
Forum: LIVE PLC Questions And Answers March 29th, 2017, 01:49 AM
Replies: 1
Views: 567
Posted By Charbel
MLSS location

dear,

for thickened sludge pumping station, is the MLSS located in tank or located on the discharge line, which location is better? (please refer to attachment)

maybe on the pump discharge is...
Forum: LIVE PLC Questions And Answers March 27th, 2017, 09:56 AM
Replies: 3
Views: 615
Posted By Charbel
Running a centrifugal pump against a closed valve

dear,

sometimes it is required to run a centrifugal pump after starting it against a closed valve to ensure that the proper pressure is built up and then open the motorized valve.

Do we usually...
Forum: LIVE PLC Questions And Answers March 27th, 2017, 06:00 AM
Replies: 5
Views: 847
Posted By Charbel
Directly buried FO cables vs Cables running in Underground ducts

Dear,

cables running in underground ducts offer several advantages (technically) over the ones running in directly buried such as FO cables running in underground FO ducts will be easier to...
Forum: LIVE PLC Questions And Answers March 16th, 2017, 12:46 AM
Replies: 3
Views: 765
Posted By Charbel
dear, this is intended for liquid LPG, and...

dear,

this is intended for liquid LPG, and we are using a check valve for this purpose, we want to check if it is possible to install in anyway limit switches on this check valve.

thanks,
...
Forum: LIVE PLC Questions And Answers March 15th, 2017, 11:25 PM
Replies: 3
Views: 765
Posted By Charbel
LPG check valve with Limit switch

Dear,

I am defining a check valve for LPG with Limit switch, is it available in the market?
Really appreciate any feedback on this issue.

Thank you,

Charbel
Forum: LIVE PLC Questions And Answers March 14th, 2017, 05:17 PM
Replies: 0
Views: 514
Posted By Charbel
LPG control system

Dear

I am working on designing a control system for LPG plant where waterbath Vaporizers are used. I was wondering how a LPG vaporizer will have to be controlled. So I found out that LPG inlet...
Forum: LIVE PLC Questions And Answers March 3rd, 2017, 01:40 AM
Replies: 7
Views: 1,526
Posted By Charbel
Switches for large network

Dear,

I have 130 RTU's connected in a ring network to a dual redundant PLC, can you kindly direct me on some special managed switch that can handle this large network.

the RTU's uses WAGO...
Forum: LIVE PLC Questions And Answers February 28th, 2017, 03:07 AM
Replies: 2
Views: 723
Posted By Charbel
plc cabinet location in MV room

Dear,

can the PLC cabinet be located in a MV substation or it has to be located in a separate room?

if separate room is needed, then partition (aluminum or any other type) inside the MV...
Forum: LIVE PLC Questions And Answers February 23rd, 2017, 09:48 PM
Replies: 1
Views: 1,147
Posted By Charbel
selecting of flow control valve

Dear,

I am working in selecting a flow control valve located downstream of positive displacement pump.

specs is requiring that CV to be between 30% for minimum flow, 50% for operating flow and...
Forum: LIVE PLC Questions And Answers February 15th, 2017, 04:09 AM
Replies: 5
Views: 1,324
Posted By Charbel
measuring flow in partial filled pipes

Dear,

Pipe size is 1200mm and I need to install sensor for measuring flow, I check krohne and Toshiba for electromagnetic flowmeter for partial filled pipes, maximum pipe size is 1000mm for krohne...
Forum: LIVE PLC Questions And Answers February 10th, 2017, 11:00 AM
Replies: 18
Views: 2,681
Posted By Charbel
please refer to as-built from contractor which...

please refer to as-built from contractor which are showing PDT and they are naming it as filter clogging device, that is why I am trying to figure out where this sensor will be located and if it can...
Showing results 1 to 25 of 284

 
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