Network Sites:
Latest
Forums
Education
Tools
Videos
Datasheets
Giveaways
Latest
Projects
Education
Latest
News
Technical Articles
Market Insights
Education
Latest
News
Opinion
Interviews
Product Highlights
Research
Forums
Log In
Join
Log in
Join Control.com
Or sign in with
Facebook
Google
LinkedIn
0:00
/
0:00
Podcast
Latest
Subscribe
Google
Spotify
Apple
iHeartRadio
Stitcher
Pandora
Tune In
Menu
Explore
Content
Company Directory
Forums
Industry Articles
Industry White Papers
News
Technical Articles
Textbook
Worksheets
Products
Circuit Protection
Connectors
Control Panel
Control Systems & HMIs
Enclosures, Racks & Cabinets
IIoT
Industrial Controls
Motors
Networking
PLCs & PACs
Pneumatics & Hydraulics
Power
Protocols
Robotics
Safety
Sensors
Simulation
Test & Measurement
Vision Systems
Wire & Cable
View All
Industry
Agriculture
Automotive
Building
Cement
Chemical
Electronics
Food & Beverage
Metal
Military/Aerospace
Mining
Nuclear
Oil & Gas
Medical & Pharmaceutical
Pulp & Paper
Rubber & Plastics
Utilities
View All
Articles
Latest
News
Technical Articles
Industry Articles
Industry White Papers
Forums
Latest
General Discussion
Hardware
Software
Communication
Education
Vol. I - Fundamentals
Vol. II - Instrumentation
Vol. III - Measurement
Vol. IV - Control
Vol. V - Reference
Worksheets
Datasheets
Directory
Company Directory
Podcast
Connect with us
Network Sites:
Home
Members
otised
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
Recent content by otised
Search Forums
New Posts
O
Primary Flow Element Accuracies
The accuracy depends on the accuracy of the dp transmitter AND the primary flow element. If you want +/- 1% accuracy, you must start with a calibrated flow element. That gets you a certified calibration sheet for the flow element. It also costs you more.
otised
Post #4
May 15, 2020
Forum:
Instrumentation & Measurement
O
Site Power Outage Due to Underfrequency
I have comments on IGV control and SRV control. The comments apply to a properly tuned system with control devices calibrated to their specifications and with the hydraulic control oil pressure within specifications. Regarding IGVs: When the IGVs are operated in temperature control mode...
otised
Post #29
Sep 20, 2019
Forum:
Power Generation
O
GE Speedtronic Mark IV Control System Cost
CSA, Overall, your cost estimates look reasonable. I will confirm that no Mark IVs were used for steam turbine control. The Mark IV was the first microprocessor based GE gas turbine control. At the time it was put into service, GE Steam Turbine was making their own control panels (not using...
otised
Post #3
Aug 28, 2019
Forum:
Power Generation
O
GT Driving Centrifugal Compressor
Shahabas, You don't say anything about what type of gas turbine is driving the compressor. Is it a GE design or some other design? is it single shaft or 2 shaft? Is it heavy duty or aircraft derivative? What is the rpm it is being rotated at? Do you know for certain that it is reverse...
otised
Post #3
Aug 14, 2019
Forum:
Power Generation
O
A Question About Intrinsically Safe Instrument
The instrument will operate and run properly. However, it will no longer be an intrinsically safe installation, it will not meet Ex requirements because in the event of a power supply failure there will be the capability of producing a spark with sufficient energy to ignite an explosive gas.
otised
Post #3
Jun 16, 2019
Forum:
Process Control
O
Level Gauge on Steam Drum
I don't know what your budget is, but back before I retired (over 9 years ago) our normal practice for boiler drum level measurement was to use differential pressure transmitters (with pressure compensation) for control and indication, with a code required independent measurement for indication...
otised
Post #2
Jun 9, 2019
Forum:
General Automation Chat
O
Gross Calorific Value Effects
GE supplies a fuel system that is designed for the heating value defined by the purchaser. They basically match the fuel nozzles to the specified gas. You would likely need to contact GE to see what changes (if any) are required to use your gas. It is possible control settings can be made to...
otised
Post #3
May 24, 2019
Forum:
Power Generation
O
Compressor Pressure Discharge
Abdullah, At 50 MW the IGV's are likely near the minimum angle and at 120 MW they are near or at maximum angle (you didn't identify which model gas turbine you have). Therefore the airflow through the gas turbine is significantly less at 50 MW. Also, at low IGV angle you may have inlet bleed...
otised
Post #3
May 12, 2019
Forum:
Power Generation
O
MKVIe Ground Detected Above 3300 RPM
From the information you have provided, I would suspect the problem to be in a solenoid that operates when L14HS (or L14HSX) picks up. You may be able to troubleshoot this when shut down. Compressor Bleed Valves would be one of the first things I would look at, but there are a lot of things that...
otised
Post #6
May 2, 2019
Forum:
Power Generation
O
Measuring Steam Quality
>As long as you have a properly calibrated temperature >sensor in the incoming steam, the amount of super-heat tells >you everything. ryanb clearly stated that the steam is saturated, so there is no superheat. I don't have any knowledge of a method of measuring the quality of saturated...
otised
Post #3
Apr 19, 2019
Forum:
Process Control
O
EGT 20 Deg C Lower Than Expected
>we will try to adjust the IGV setting next week. My concern >is the mass flow reduction when we introduce more >restriction at IGV, temperature might increase, but how much >the reduction of mass flow has impact on the exhaust thermal >energy. Reducing the IGV angle will lower the air...
otised
Post #4
Apr 19, 2019
Forum:
Power Generation
O
PG6111FA M-VIe control IGV hunting in Preselect Load
STLTLS, Warning on CTIM cable replacement: Make absolutely sure the sensors are thermocouples! Back before I retired, GE was using RTD's for these sensors. RTD's need copper interconnecting wires. They were typically 3-wire RTD's and all 3 wires must be used for accurate measurements.
otised
Post #15
Apr 12, 2019
Forum:
Power Generation
O
GE Frame-9E Standard Combustion Machine
Rokan, Do you have performance curves for both gas and HSD fuels? If so, do they indicate any difference in output between the 2 fuels? Where you are giving a difference in output between CC mode and SC mode, are you running CC mode with the exhaust gas passing through the HRSG and SC mode...
otised
Post #4
Apr 7, 2019
Forum:
Power Generation
O
Removing Measurement Orifice Plates to Stop Restrictions in Pipeline
What is missing from this discussion is whether or not you need to measure the flow in these pipes. If you no longer need to measure the flow in these pipes, and won't need to in the future, then remove the orifice plates. If you do need to measure the flow, what means will you be using that...
otised
Post #5
Mar 31, 2019
Forum:
Instrumentation & Measurement
O
Gas Turbine IVG
I think the rated speed of rotation of the compressor has little to do with the need for VSV's. The purpose of VSV's and VIGV's is to prevent compressor stall (similar to surge on a centrifugal compressor). The rated speed of the gas turbine is a function of the diameter of the wheels. The air...
otised
Post #15
Dec 23, 2018
Forum:
Power Generation
Top
Continue to site
QUOTE OF
THE DAY
“
”
-