Gas Transmission
Wide Range of Operating Conditions
Wide Range of Capacity Control Steps including Single Acting Cylinders
Large drivers
Difficult Valve Selection due to the Wide Operating Range
Complex Acoustic Responses
Storage Injection and Withdrawl
Higher Pressures
Attention to Cylinder Lubrication
Water cooled packing cases
Wide Range of Operating Conditions
Difficult Valve Selection due to the Wide Operating Range
PRC (Petroleum / Refinery / Chemical)
Industrial Gasses
More Stringent Specification Limitations
New Customer base
Equipment Type:
Large Frames
JGU, JGZ, KBB and KBV
Some JGC and JGD
Large Two Throw Frames
Requiring Special Tools for Maintenance
High Flows with Large Piping
High Frequency Components
Large, Low Natural Frequency Cylinders
VS Forged Steel Cylinders
High Pressure
Lubrication
Water Cooled Packings
Available Tailrods
Driver Type:
Electric Motor
Unique Installations
Shaft Sizing Restrictions (see Packager's Standards)
Always Requiring Torsional
Often Requiring Torsional Detuning Devices (flywheels, detuners, special couplings...)
VFD (Variable Frequency Drive)
Unique Installations
Shaft sizing restrictions
Always Requiring Torsional
Often Requiring Torsional Detuning Devices (flywheels, detuners, special couplings...)
Wide range of speeds, often with blackout ranges due to torsional response
Large Gas Engines
High horsepower - high excitation forces
Longer drive trains
Often Requiring Torsional Detuning Devices (flywheels, detuners, special couplings...)
Some larger engines designed for power generation may require special couplings and attention to torsional results
Gear Boxes
Difficult to detune torsionally
Most often requiring special couplings
Axial and Lateral Alignment Concerns including Thrust Limitations
Location:
Offshore and FPSO
Limited Access
Limited Space for Maintenance
High Visibility
International Destinations
Less Support Infrastructure in some Regions
Other:
Sour Gas
Proper Materials
Purge and Vent Systems
Pneumatic Fixed Volume Clearance Pockets
Supply and vent lines
Complex controls
Project Reviews:
Many Critical Projects can be successful with a comprehensive review of the system during different phases of the project:
Budget and Quotation Phase
Regional Sales Managers and Applications Engineering can provide assistance in selection
Order Phase
Order Entry can provide assistance with scope of supply
Applications Engineering can provide assistance with documentation, including torsional data
Tech Services can provide assistance with packaging design for maintenance support and vibration avoidance
Installation and Start-Up Phase
Tech Services can provide assistance with installation review, start-up check list review, review of vibration concerns
Torsional Providers:
The success of the torsional analysis depends heavily on the modelling of the equipment and operating range of the compressor. A torsional provider must be familiar with moderate to high speed reciprocating compressors and must be provided with the full range of operation of the compressor. The operating range is to include part load cases, cases with single acting cylinders and speed variations. Familiarity with Ariel compressors is quite helpful in understanding aux end amplitudes, the availability of the torsional data (mass elastic data, torque effort data and fourier coefficient data) and availability of specific flywheels, detuners and internal flywheels.
Acoustical and Mechanical Providers:
Familiarity to moderate and high speed reciprocating compressors will aid in the successful acoustical and mechanical analysis. Some larger skids and many platform mounted skids may require a skid analysis to ensure vibration levels and stress levels of skid, piping and vessels are acceptable.
Torsional and Acoustical analyses may have interfering recommendations. More complex the operating ranges have a greater chance of interference between the torsional, acoustical and mechanical systems.
Ariel
Corporation Application Manual
16 June 2006