Features of Level 1 and Level 2 Service
The following chart compares features of each service with a standard Pulsation
Study.
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|
Features
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Level 1
Basic Sizing
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Level 2
Mini Pulsation Study
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Includes Mechanical Analysis (Note 1)
|
|
Risk Level See Note 2
|
Medium Risk
|
Lower Risk
|
Lowest Risk
|
Bottle Sizing Algorithms:
- API 618, 5th Edition; API 11P
- Wood VDN’s Sizing Technique
- Acoustic model using Time Domain (MAPAK software)
|
✓
✓
-
|
✓
✓
✓
|
✓
✓
✓
|
|
Operating Conditions Evaluated
|
Single condition per run
|
Up to 20
|
Up to 1000
|
|
Filter Design, if required (including sizing of choke tube, baffles, etc.)
|
|
✓
|
✓
|
|
Sizing of Orifice Plates
|
|
✓
(cylinder nozzle only)
|
✓
|
|
Utilize Wood VDN’s extensive database of past projects
|
|
✓
|
✓
|
Avoids any changes to bottle sizing
Allows packager to order material (without risk of size changing)
|
|
✓
|
✓
|
|
Calculate pressure pulsation and forces in bottles and cylinders
|
|
✓
|
✓
|
Calculate Static AND Dynamic Pressure Drop in choke tubes and
orifice plates
|
|
✓
|
✓
|
|
Calculate Static AND Dynamic Pressure Drop in the piping system
|
|
|
✓
|
|
Calculate pressure pulsation and forces throughout the compressor package
|
|
|
✓
|
Detailed performance analysis of compressor package, including
pulsation effects
|
|
|
✓
|
|
Minimize bottle costs (optimized design) to reduce capital cost for packager
|
|
|
✓
|
Mechanical analysis of piping, scrubbers, vessels to avoid resonance
(Design Approach 3 scope)
|
|
|
✓
|
|
Turnaround Time for Bottle Size Recommendations
|
Immediate
|
3 busness days
|
5-8 business days
for acoustical
recommendations
|
Notes:
1.
2.
Pulsation/Vibration Study per API 618 requirements.
For more information, including our FREE primer on pulsation/vibration studies,
refer to
www.BetaMachinery.com.
For application assistance,
call +1-403-245-5666.
Risk of inaccurately sized bottles:
If pulsation bottles are sized too large, the risks are:
- More difficult mounting and supporting requirements for large bottles.
- Higher capital costs for material and fabrication of large bottles.
If pulsation bottles are sized too small, the risks are:
- Reliability concerns if there are excessive pulsations and vibrations.
- Reduced performance and higher operating costs caused by excessive pressure drop.
- Higher capital costs if secondary volumes are required.
In rare cases, a mini pulsation study is not adequate to properly size bottles.
Instead, a full pulsation study is required.
This limitation could apply to specialty
gas compositions and very high pressures.