PADEYE PLUS User Manual

Transcription

PADEYE PLUS – Padeye Design and Optimizer
for Un-stiffened Padeyes
User Manual
Version : 1.0.0
Date : 07-November-2014
License Information
PADEYE PLUS
PADEYE PLUS software and source code are property of Technomak Offshore & Marine
Consultancy.
The software along with this user manual allows the purchaser to use the
software for commercial and non-commercial purpose.
DISCLAIMER OF WARRANTY
Neither Technomak Offshore & Marine Consultancy (and its group of companies), nor the
author of this program and documentation are liable or responsible to the purchaser or user for
loss or damage caused, or alleged to be caused, directly or indirectly by the software and its
attendant documentation, including (but not limited to) interruption on service, loss of business,
or anticipatory profits.
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Contents
_
License Information ................................................................................................. 2
About PADEYE PLUS............................................................................................... 4
Unit System .............................................................................................................. 5
PADEYE PLUS Inputs .............................................................................................. 5
Padeye Properties Calculation................................................................................ 8
Modifying the Results .............................................................................................. 9
PADEYE PLUS Output ............................................................................................. 9
Limitations ................................................................................................................ 9
References .............................................................................................................. 11
Appendix ................................................................................................................. 12
Appendix 1.1 - Example 1..................................................................................... 13
Appendix 1.2 - Example 2..................................................................................... 21
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About PADEYE PLUS
PADEYE PLUS is designed for iOS platforms and available on iPhone and iPads. This manual
gives step by step procedure to use the software, which can be used to design, optimize and
modify unstiffened padeyes for offshore, onshore and harbor lifts.
PADEYE PLUS
automatically calculates matching shackle, optimum plate grade and thickness, clearances
between shackle and padeye. The user can edit and modify the padeye parameters to suit their
specific requirements and available inventory. Padeye design is carried out in accordance with
AISC Allowable Stress Design (9th Edition), API-RP-2A Working Stress Design (21st Edition) and
best practice in the industry. You can download and install PADEYE PLUS from App Store.
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Unit System
Current version of PADEYE PLUS uses millimeter-Metric Tons. Angular measurements are in
degrees.
PADEYE PLUS Inputs
Main input sheets for PADEYE PLUS is similar to the below. The user interface may vary
depending on the platform and equipment (iPad or iPhone).
Input Sheet
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Padeye SWL
This is the padeye safe working load for which padeye is to be designed. If there are no specific
requirements, user may input only the static load. All factors of safety based on best industrial
practice and design codes are automatically included during design and optimization.
OOP Angle
This is the actual out of plane angle (angle between padeye plane and sling) for the padeye.
This may be left empty, in which case a default OOP angle of zero degrees will be considered
for Offshore/Harbour lift, zero for Onshore lift and 2.5 degrees if the padeye is designed for DNV
standards. To override default values, input actual OOP angle in degrees.
It is not a good practice to provide unstiffened padeyes for higher OOP angle. To prevent
accidental input error, a warning message is displayed when the OOP angle is greater than 10
deg for lift weight >= 100 MT or OOP angle is greater than 15 deg for a lift weight of < 100 T.
Factor of Safety
Factor of safety is the design factor including dynamic factor, consequence factor and skew load
factor. This may be left empty, in which case the software considers a factor of safety of 2.0 for
Offshore lifts, 1.5 for Harbour lifts and 1.35 for onshore lifts. User can override the default
values by entering the required Factor of Safety.
Sling Angle
Sling angle is the angle made by sling with horizontal. This may be left empty, in which case a
default sling angle of 60 degrees will be used for Offshore/Harbour lifts and 45 degrees for
Onshore lifts. However, if your padeye is symmetrical, the default sling angle is 90 degree.
User may enter the actual sling angle. The software automatically designs the padeye for the
sling angle ± 5 deg.
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Lift Type
Default lift type is Offshore, which can be changed to Harbour lift or Onshore lift based on the lift
condition. If the lift is land lift with moving crane, harbor lift shall be selected. Proper selection
of lift type will ensure that the recommended factor of safety is automatically selected.
Icons and Symbols
Click on the
button to get quick help on the inputs.
Click the Email Icon
result.
on the ‘Basic Parameters’ and ‘Advanced Parameters’ tab to email the
To display this user manual, click
clicking the Email Icon
Click
Use
. User can email the user manual by
below the user manual.
at any stage to go back to the previous screen.
to display the About Box.
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Padeye Properties Calculation
Optimization
When the user finishes the inputs and clicks
button, the software tries to find
an optimum padeye based on the inputs. It uses the best industrial practice, recognized design
codes (AISC-ASD, API-RP-2A-WSD and DNV 2.7-1). It also selects an optimum shackle and
checks the key parameters such as jaw width clearance, clearance between inside of shackle to
the padeye (including reduced clearance for lifting slings) and all the unity ratios including
bending unity ratios. The result screen after optimization is similar to the below.
‘Basic Parameters’ Tab
‘Advanced Parameters’ Tab
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Modifying the Results
User is allowed to edit and modify any of the key padeye parameters – from main dimensions of
padeye to material grade, shackle, thickness and number of main plates, cheek plates and
spacer plates.
User can use this to suite the available shackle dimensions and material
inventory. Click on the button to edit the parameters. When the user changes the material
grade, reduction in yield strength according to thickness is automatically applied. Then the
padeye is changed, the pinhole diameter for main plates, cheek plates and spacer plates are
automatically resized to suit the selected padeye pin.
IMPORTANT
PADEYE PLUS does not overwrite the calculations when the changes are made. To make the
modifications effective in the output, user should press
.
PADEYE PLUS Output
PADEYE PLUS output is displayed when calculation is complete and Report Icon
is
selected. AISC and Combined stress checks are carried out for all designs. If DNV Stress
Check is checked, additional output is displayed with DNV contact stress and Tear-out stress.
The results can be emailed in pdf format, if your device supports email functionality, by clicking
Email Icon
.
Limitations
1.
Current version of PADEYE PLUS is specifically made for offshore industry and uses
Working Stress Design methodology only. We can implement design codes such as
LRFD etc. based on customer feedback.
2.
In some cases, the optimizer may not converge. This is mainly because the optimizer
fails during geometry check (such as jaw width clearance). In such a case the App
throws a message as below.
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In such a situation, it is recommended to review the results by clicking the Report icon
and manually change the last optimized parameters.
3.
While changing the shackle, user needs to first select the shackle before pressing the
Select Icon
. This is a known issue and user is requested to select the desired
shackle first.
4.
In some cases, the output may display ‘*FAIL*’ in the geometric compatibility check.
This is mostly because the iteration converged to an adequate padeye, but failed to
select a proper spacer plate. In such a case, user is requested to
the
results by manually changing the spacer plate thickness.
5.
The optimizer is suitable for padeyes between 1.0 MT and 1814MT. Due to the same
reason mentioned in (4), the geometric compatibility with available shackle size may fail
for very small padeyes, in which case the user is requested to design manually.
6.
Present version does not include the spacer plate in the drawing produced. User shall
take care to include the spacer plate as per the recommendation.
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References
1
2.
3.
"Manual of Steel Construction – Allowable Stress Design”, 9th Edition, by American
Institute of Steel Construction
"Recommended Practice for Planning, Designing and Constructing Fixed Offshore
Platforms – Working Stress Design", API-RP-2A WSD, 21st Edition, by American
Petroleum Institute
“Standards for Certification – Offshore Containers”, June 2013, DNV 2.7-1 by Det
Norske Veritas
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Appendix
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Appendix 1.1 - Example 1
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Objective :
The purpose of this exercise is to design a padeye of 55 MT capacity for Offshore use. The
padeye shall also conform to DNV 2.7-1 guidelines.
Inputs for the optimization is as below. Ensure that the ‘DNV Stress check’ is checked.
Input Screen
Upon pressing
, output similar to the below is obtained.
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Output of Example-1
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Verification of the inputs indicates that the minimum out of plane angle of 2.5 deg (for DNV 2.71) is automatically selected. Sling angle is default for offshore lift (60 deg) and factor of safety is
default for offshore lift (2.0 as per API-RP-2A WSD).
Most suitable shackle and list of
compatible shackle with minor variation in pinhole diameter is also listed. Out of plane shear
force (9.81 * (55 * sin(2.5) + 0.05 * 55) = 50.512 KN) is calculated in accordance with the OOP
angle and considering API recommendation.
Geometrical compatibility is checked and spacer plate to suit the recommended shackle spread
is also automatically selected.
Padeye obtained has a maximum unity ratio of 0.9631, indicating the results are optimized. The
results can be manually verified.
A not-to-scale drawing of the padeye is also produced along with the report which can be used
for production.
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Appendix 1.2 - Example 2
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Objective:
A generic padeye of 200 MT lifting capacity for offshore use with a factor of safety of 2.5 is to be
designed. The padeye shall also have a design out of plane angle of 1.0 deg. Available plate of
25mm S355J2G3 is in stock. Further the available shackle is 250MT Greenpin-6033. Padeye
designed shall suit the available shackle.
Step 1:- Get an optimum design for SWL of 200MT, Factor of Safety of 2.5 and OOP angle of
1.0 deg. Input screen is shown below.
Input Screen
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Pressing
gives an optimum padeye as per below screen shot.
However, as you noticed, the shackle and plate sizes are different. You can change the shackle
by pressing the Crosby,200.0 T button, which gives a list of shackles in database. Scroll down
and select the 250 T Greenpin-6033 from the list and press
. Screenshot for the steps is as
below.
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Select 250 MT Greenpin-6033 from list
Press
. An alert message
confirming the selection is displayed
The main plate thickness is to be changed from 60mm to 63.5mm and the outer cheek plate
thickness to be changed from 22.5mm to 25.0mm. To change the plate thickness, select the
‘Advanced Parameters’ Tab. You can click on the plate thickness 60.000 and 22.500 . A
user input message asking for the new thickness appear. Once the values are filled in, the table
is updated as per below.
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Click on the cheek plate 5&6 and
change to 25mm
The final screen after the thickness changes should appear as below.
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Which verifies that the changes have been accepted. Press
to rerun the
new analysis and update the report. The report generated will be similar to the below. Review
the output and you can see that the plate thickness are changed and the Shackle is also
changed to selected shackle. Further the pinhole dia, and parameters related to shackle (jaw
width, inside length etc) are also changed.
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Output of Example-2
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PADEYE PLUS User Manual

Transcription

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