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1
- #1
bicycledisciple
Mechanical
- Nov 25, 2007
- 17
A question was asked here in this forum in 2022 but sadly, no soul has responded to it. As the thread is now closed, below is a reply :
reference :
The steps, atleast from a centrifugal compressor perspective are :
1. Make sure you have all the required info to size the compressor, including specifications that matter to the sizing. Consider off-design cases, like startup, or alternatives. You'd be often surprised how much of a problem these begin to pose later into the selection.
2. Run the internal company software with the gas analysis and process conditions.
3. Set the configuration. Is it a straight thru, back-to-back, double flow, straight thru intercooled, straight thru with extractions... ? This depends on what the company's offerings are.
4. Tweak selection based on frame size (min/max capacity range, min/max speed range) aero package (flow co-efficients, stage length, overall bearing length, nozzle sizes), thermo (discharge temp), ideal curve shape, coupling sizes, bearing sizes, rotordynamics. Pay attention to log dec, all your critical speeds, separation margins. If API 617 applies, the specific design criteria would need to be factored in.
5. Prepare API datasheet and performance curves. A general arrangement drawing will greatly help the customer in their planning. Optional : A utility datasheet.
6. If the technical selection meets requirements, the next step is moving to the commercial proposal. But that's a different phase. If the technical selection does not meet requirements, or if some new process changes come by, then iterate on steps above.
7. A firm technical proposal must do all of the above and also attach standard comments and exceptions to the specifications and include all the sub-vendor comments and exceptions as well. This sets the expectations of the customer right and almost always impacts the cost of the final offer.
This is the process of a system integrator, the application engineer who prepares the offer.
If you're looking for how a compressor component is designed, then that would be a core sub-speciality (like aero, rotordynamics, controls etc) and often you'd need a higher engineering degree to get sucked into those kinds of things. A PhD is often required by aerodynamicists or rotordynamics specialists (in some companies, they are called "Subject Matter Experts"). They work at the level of consultants and are often called to investigate unique and difficult problems and provide solutions quickly.
RG
Ron
-------------------------------
reference :
The steps, atleast from a centrifugal compressor perspective are :
1. Make sure you have all the required info to size the compressor, including specifications that matter to the sizing. Consider off-design cases, like startup, or alternatives. You'd be often surprised how much of a problem these begin to pose later into the selection.
2. Run the internal company software with the gas analysis and process conditions.
3. Set the configuration. Is it a straight thru, back-to-back, double flow, straight thru intercooled, straight thru with extractions... ? This depends on what the company's offerings are.
4. Tweak selection based on frame size (min/max capacity range, min/max speed range) aero package (flow co-efficients, stage length, overall bearing length, nozzle sizes), thermo (discharge temp), ideal curve shape, coupling sizes, bearing sizes, rotordynamics. Pay attention to log dec, all your critical speeds, separation margins. If API 617 applies, the specific design criteria would need to be factored in.
5. Prepare API datasheet and performance curves. A general arrangement drawing will greatly help the customer in their planning. Optional : A utility datasheet.
6. If the technical selection meets requirements, the next step is moving to the commercial proposal. But that's a different phase. If the technical selection does not meet requirements, or if some new process changes come by, then iterate on steps above.
7. A firm technical proposal must do all of the above and also attach standard comments and exceptions to the specifications and include all the sub-vendor comments and exceptions as well. This sets the expectations of the customer right and almost always impacts the cost of the final offer.
This is the process of a system integrator, the application engineer who prepares the offer.
If you're looking for how a compressor component is designed, then that would be a core sub-speciality (like aero, rotordynamics, controls etc) and often you'd need a higher engineering degree to get sucked into those kinds of things. A PhD is often required by aerodynamicists or rotordynamics specialists (in some companies, they are called "Subject Matter Experts"). They work at the level of consultants and are often called to investigate unique and difficult problems and provide solutions quickly.
RG
Ron
-------------------------------
