I was wondering if anyone knows what is meant by "Design for no negative tolerance on compressor capacity".
Thanks,
|
Posted 20 April 2018 - 01:30 PM
I was wondering if anyone knows what is meant by "Design for no negative tolerance on compressor capacity".
Thanks,
Posted 20 April 2018 - 01:40 PM
I was wondering if anyone knows what is meant by "Design for no negative tolerance on compressor capacity".
chempro,
The extra or more flow capacity consideration for a compressor than the required capacity is normally called "No Negative Tolerance" which will lead to zero negative tolerance...
Posted 20 April 2018 - 10:30 PM
API, and other standards fo rotating equipment, allows a machine to be designed with a tolerance. I don't recall the exact numbers, but it is typical that a standard allows for machine that performs within ±2% on head. For instance, you specified 100 m of head for a centrifugal pump. That manufacturer can design for that and on test, if it produces between 98 and 102 m of head, it will can be said to pass the test. This is something many designers fail to recognize and can lead to various issues (overpressure, insufficient capacity) if not considered in the overall system design.
By specifying that you want a compressor designed with no negative tolerance, it means you want a guarantee the machine will test at the specified performance or better. Using my pump example, if I had specified the pump for 100 m with no negative tolerance, it would fail the test below 100 m. The challenge with such a design is that it may cause the manufacturer to overdesign the machine. My pump might now produce 104 m of head when I asked for 100. I have seen manufacturers agree to no negative tolerance, only if we will accept higher positive tolerance on test.
Asking for zero tolerance is ridiculous because no engineering design is that good.
Posted 21 April 2018 - 11:25 AM
Thanks Technical Bard.
Co2 Removal Membranes Between Compressor StagesStarted by Guest_Sinclc_* , 26 Mar 2024 |
|
|
||
Answered
Centrifugal Compressor Performance Curves In Aspen HysesStarted by Guest_Rafcio_* , 14 Mar 2024 |
|
|
||
Design Gauge Pressure Inlet To A Centrifugal Compressor.Started by Guest_Mohammad3799_* , 03 Mar 2024 |
|
|
||
Gas CompressorStarted by Guest_Md Ziaul Islam_* , 23 Jan 2024 |
|
|
||
Settle Out Pressure For Reciprocating CompressorStarted by Guest_prashant.badgujar_* , 03 Jan 2024 |
|
|