|
![[Under Construction]](images/undercon.gif)
| |
This basic GE compression skid requires torsional analysis for the driver
(motor, coupling and compressor drive train), acoustic analysis (pulsation
bottle sizing), dynamic structural analysis (compressor manifold, skid, driver
and compressor frame) and vessel code calculations (pulsation bottles, suction
scrubber vessel).
Manufacturers rely on sound package engineering principles for right sizing
components. The fabricator takes ultimate responsibility for the proper
operation of the unit. Packaging compressor skids is very competitive.
It's an exceptionally low margin business and inadequate component engineering /
errors add risk. TTS recognizes that engineering has to be cost effective
and delivered fast!
API Standards and Procedures
- API 617 - Axial and Centrifugal Compressors
- API 618 - Reciprocating Compressors
- API 619 - Rotary Type Positive Displacement Compressors
ASME Codes
- Boiler and Pressure Vessel Code
- B31.3 Process Piping
- B31.4 Pipelines
Requirements
- Each code or standard provides basic requirements for design. In
addition to the ASME Code(s) setting requirements on materials, life and
strength, the API standards set targets for the prevention of mechanical
resonance from torsional, acoustical or mechanical resonance.
-
- API 618 recommends three design approaches. Approach 1 provides
for simple calculations without acoustical simulation analysis.
Approach 2 adds acoustic suppression devices and simulation. Approach
3 adds mechanical analysis of the compressor manifolds and piping, checking
for interaction between acoustical and mechanical systems. The
appendices contain guidelines for the sizing of acoustic filters using the
Helmholtz method.
-
- Pressure Vessel Design
- Shaking forces in piping can cause vessel cracks. Vessel nozzles
are adequately reinforced to resist shaking forces of systems that may tune
up.
- Skid, Driver and Compressor Frame Design
- Design provides adequate stiffness to resist shaking forces with limited
deflection / displacement to protect the on board systems.
- Dynamic Analysis of Piping, Supports and Mechanical Systems
- Impact and design of overhung piping, resonance or pulsation induced
vibration and pulsation suppression
- Torsional (Rod & Gas Loading) & Mechanical Analysis
- Provide adequate separation between operating frequencies and sufficient
stiffness preventing resonance during normal and upset operating conditions.
|
