Offpipe Assistant.pdf

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OFFPIPE ssistant User Manual

O FPIPE A s istan t

TM

Us r Ma ual V rsion: 2. .2

Copyright © 2010-2 015 offpip assistant..com. All

ights Res rved.

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INDEX 1 FU CTION ................... ................ ................ ................ ................ ................ .............. 1 2 INSTALLATION............................. ................ ................ ................ ................ .............. 2 3 HO TO US ............................... ................ ................ ................ ................ .............. 3 4 FA LT MESS AGES & 5 TE HNICAL

OTES ..................... ................ ................ ................ ............ 16

UPPOR & AUTH RIZATIO .............................. ................ ............ 17

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1 FUNCTION OFFPI E Assist ntTM is a set of co puter aided design software for offsho e pipeline S-Lay. This softwar is used t provide ptimized onfigurati n param ters for S-Lay barge, with little cost of ca lculating time. Effici ncy and uality of ffshore pipelay design can be improved by using

FFPIPE ssistantT .

OFFPI E AssistantTM has several fea ure functi ns as foll wing: 1. Precise laybar e and stinger modeling. It is e sy for us rs using

FFPIPE ssistantTM

to constr ct precise model of laybarge nd stinger, which c n be sav d as mo el file and read by t e softwar directly i the futur . Users c n get roller coordinates corres onding to the bendi ng radius f pipeline specified by users r apidly. This function makes it ossible to build a la barge model database of a co pany, w ich will be called dir ctly in an lysis. This type of model building improves the effi iency, pr cision an convenience of laybarge and stinger m del construction co pared wi h that of

FFPIPE.

2. Finit element analysis f r normal ipe laying. Just like OFFPIPE, it is a basic function of OFFPIPE Assist ntTM to conduct st tic finite

lement a alysis for normal pipe laying.

Accordin to engin ering par meters in ut by us rs, the so tware can provide FEA results rapidly. Due to focus of softw re, OFFPIPE AssistantTM doe not provide modul s of initial laying, abandon/recovery and dynamic nalysis. 3. Opti ized layi g parameters selec ion. This unction allows user to obtain optimized laybarge configuration with

inimum otal stress within t e specifi d pipelin bending

radius a d tension scope, according o FEA r sults. Alt ough the analysis results o OFFPIPE AssistantTM and O FPIPE ar e almost he same, users are allowed to select a calculating core within OFFPIPE AssistantTM

EA core and OF PIPE FE core. I

OFFPIPE core is c osen, it s ould be n ted that t e calcula ion time

ill increas because

of the tim of opera ing OFFPIPE. By above functio s of OFFPIPE AssistantTM, u ers can et best la barge co figuration for certai pipe layi g project, which is an importa t reference for later design pr cedures.

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2 INST LLATIO To star to use O FPIPE A sistantTM, please: 1. Inse t the installation CD into the C -ROM dr ive, or unzip the inst allation pack file. 2. Cop “OFFPIPE Assistant” folder in root directory of ins allation C or installation pac file to har disk of y ur PC. 3. Inse t the attached hard lock into o e of USB port in yo r PC. 4. Dou le click “ FFPIPE ssistant.e e” icon in the folder to start th software. OFFPI E AssistantTM runs n PC wit Windows XP or Wi dows 7.

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3 HOW O USE

Fig. 3.1 Main interface of OFFPIPE Assi tantTM

Figure 3.1 show the mai interface of OFFPIPE Assis antTM, which includ s 4 main parts: 1. Main menu an tool butt ns are in the top of window,

hich are used to run importan

functions of the soft are. 2. A tre view is i the left o interface, users can go to any part of th software by clicking the corre ponding it em in the tree view. 3. In the right, th re is the operation window,

hich is used to edit model, run analysis

and view the results. 4. In the bottom is the des cription window, it shows so e descrip ions and guides fo user. Brief pr ocedure o running

FFPIPE ssistantT is shown as followi g:

1. Edit r load pr ject para eters. (1) Click “Project Parameters” in the ree view, and click the button to load / save you project p rameters, or call Stinger Builder TM to

uild your laybarge & stinger models. I

there is n project file to load, then go to the next tep to edi your proj ct param ters.

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Fi . 3.2 Load r save project parameters

(2) Cli k “Gener l Parame ers” in the tree vie , and in ut gener l parameters of the project in operation window:

Fig. 3.3 In ut general parameters

In whic : “Water Depth” edit: Input w ter depth. “Tension” edit: In ut tension of tensio ers. 4

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“Water Density” edit: Input ensity of ea water. “Tange t X” edit: Input X coordinates of tange t point b tween barge pipeli e arc and stinger pi eline arc. “Barge Radius” e it: Input pipeline be ding radi s on layb rge. “Stinger Radius” dit: Input pipeline b nding radius on stinger. “Layba ge Model” edit: Choose laybar ge model by clicking the butto by side. “Consi er Roller Length”

heckbox: Specify whether to take rolle support length into

account i analysis. (3) Cli k “Pipelin

Parame ers” in th tree vie , and in ut pipelin parameters of the

project in operation window:

Fig. 3.4 In ut pipeline parameters

In whic : In “General” Groupbox: “SMYS” edit: Inp t yield str ss of pipe steel. “Max S rain” edit: Input ma imum pip strain all wed. “Unit L ngth” edit: Input len th of unit after stinger tip. “Pipe T pe” radio roup: Select pipe type, single or pipe-in-pipe. “Nonliear” checkbox: Deter ine whet er to con uct nonlinear analysis. If chec ed, the “ ” and “B” e its are used to inpu Ramberg-Osgood

odel par meters. Please not nonlinea

constituti e model is valid on ly for OFFPIPE calculation core. Local alculation core onl provide FEA with linear consti utive model. Ramberg-Osgoo equation in moment-curvatur form is: 5

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 K M   A K y M y 

   y 

B

(4.1)

in which 2  SMYS ED 2  SMYS  I M y  D K y 

I 

(D 4  (D  2t )4 ) 64

π

(4.2)

(4.3)

(4.4)

where K

Curvature;

K y

Nominal yield curvatu e;

M

Moment;

M y

Nominal yield momen ;

A

Ramberg-Osgood par ameter in moment-curvature f rm;

B

Ramberg-Osgood par ameter in moment-curvature f rm;

I

T e area m ment of i ertia;

D

Outside dia eter of t e pipeline;

t

all thickness of the ipeline. In “Pip line” Groupbox: “Pipe Dimension” combobo : Specified pipe di ension. “Outside diamete ” edit: sh w pipe ou side diameter. “Wall T ickness” ombobox: Input wall thicknes of pipe. “Outer ayer 1 T ickness o Pipeline” edit: Input thickness of pipe coat 1. “Outer ayer 1 D nsity of Pipeline” edit: Input d nsity of pipe coat 1. “Outer ayer 2 T ickness o Pipeline” edit: Input thickness of pipe coat 2. “Outer ayer 2 D nsity of Pipeline” edit: Input d nsity of pipe coat 2. In “Optional” Groupbox, parameters are optional, if not pecified

r specifie as zero,

then a de ault value will be specified by he software. “Young”s Modulu of Pipe

teel” edit: Input You g”s Modulus of pip steel. De ault value

is 207000MPa “Steel

ensity” e it: Input d nsity of pipe steel.

efault value is 7697 0N/m3.

“Weigh in Air” edit: Input pipeline weight per m ter in air. If not spe ified or s ecified as zero, this value will be calculated automatically by the softw re. “Weigh in Wate ” edit: In ut pipeline weight per mete in water.. If not s ecified o 6

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specified as zero, t is value

ill be calc lated aut matically y the soft ware.

“Inertia Moment” edit: Inpu inertia m ment of ipeline cr ss section. If not s ecified o specified as zero, t is value

ill be calc lated aut matically y the soft ware.

(4) Cli k “Run S inger Builder” in the tree view, and click the bu ttons to r n Stinge Builder TM to build y ur laybar e & stinger models.

Fig. 3.5

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all Stinger Builder

2. Inpu analysis arameter and run he analysis to get roller supports coordinates. (1) Click “Analysi ” in the tr e view, a d click th buttons to run the nalysis, if user wan to edit so e param ters for a alysis, th n just go to next step. “Single Analysis” button: Conduct static normal ipe laying FEA for single case. “Select Best” button: Conduct calc lation of choosing best layi g parameters with minimum total stress. Time wasted and iteration times are s own in “ ime” and “Cycle Nu ber” edit .

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Fig. 3.6 Run an lysis

(2) Click “Parameters for S lect Best” in the tree view, and input par meters for choosing best laying parameters.

Fi . 3.7 Input parameters for select best

In whic : “Radiu Scope”

roupbox: In this gr upbox, the first co bobox is used to specify the

radius to be changed, which i barge radius, stinger radius, both or not change. “Min.” and 8

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“Max.” edit are use to input r adius sco e from w ich the best radius i chosen. “Step” edi is used t input ste length o radius change. Best radius will show in “Best” edit in “View” part whe calculation is completed. “Tension Scope” groupbox: In this g oupbox, the first combobox i used to determine whether to change tension. “Min.” and “Max.” edit are used to input tension scope from which the best tension is chos en. “Step” edit is us d to input step lengt h of tensi n change. Best tension will sh w in “Best” edit in “ iew” part “Parameters for

ynamic A alysis of

hen calc lation is ompleted.

FFPIPE” groupbox: In this gr upbox, there is onl

one edit t input, w ich is “Mi imum Separation of the Stinger Tip Roller”. Dynamic analysis is often c nducted in OFFPIPE, which r commen s that the roller on tinger tip should no contact t e pipeline in static nalysis.

his is due to that th pipeline stress on stinger tip

roller is sensitive with the laybarge mo ement in dynamic nalysis, if the sting r tip rolle contacts he pipelin in static analysis, then the pipeline stress on it wiill increas greatly in dynamic nalysis to exceed

MYS. Us r need to specify this “Minim m Separation of the

Stinger Tip Roller” alue and he software will tak this condition into ccount a d only the results in which the separatio of stinger tip roller is greater that this value will b take into the comp rison for elect bes tension a d pipelin bending adius. Th n user ca input the output re ult of OF PIPE As istantTM i to OFFPI E to run dynamic nalysis fo checking whether t e result i acceptable. “Calcul tion Core” radiogro p: Althou h the ana lysis resul s of OFF IPE AssistantTM and OFFPIPE are alm st the same, user are allo ed to select a calculating core within OFFPIPE AssistantTM FEA c re and OFFPIPE

EA core. Here cho se calculation core

from local and OFF IPE. If O FPIPE c re is spe ified, OFFPIPE AssistantTM will establish a new file named “CALC.d t” in “DA A” folder and a n w file n med “CALC.out” in “OUTPU ” folder in OFFPIP directory, and the conducts analysis with thes two files. Users ca check the analysis result of

FFPIPE by view t e “CALC. ut” file. If OFFPIPE

core is s ecified, t e path of OFFPIPE.bat file h s to be specified b clicking the button beside “OFFPIPE.B AT Path” dit, and the time co suming of OFFPIPE conducting analysis for one ti e has to be estim ted in “In erval” edi . It shoul be noted that the alculation time will increase

ompared with local core be ause of he time

asting of operating

OFFPIPE. If OFFPIPE FEA core is specified, bef ore analy is, please start OF PIPE and enter main operati g interfa e by pre s enter

utton, then press

lt+Enter o transfe

OFFPIPE from full creen mo e to window mode. (3) Click “Calculation Para eters” in the tree view, and i put calculation par meters in operation window. or the det il of calculation par meters, please refe to Stinge Builder TM 9

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user manual.

ig. 3.8 Inp t calculatio parameter s

When the checkbox “Auto” below checked, the default v lue of “P ecision” will be filled into the precision blank auto atically. I user wants to spec ify “Precision” value manually, he just need to unc eck the “ uto” checkbox. 3. View the result (1) Click “View” i the tree iew, and elect wh t you want to view, r just clic following nodes in he tree vi w.

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ig. 3.9 Select what you want to view

Fig. 3.10 Vie

Best Radi s and Tension

(2) Click “Best Radius and ension” in the tree view to vie

best radi s and ten ion which

produce t he minimum total str ess if “Sel ct Best” i conduct d. (3) Click “Roller Supports Coordinates” in the tree view to iew supp rt roller c ordinates.

Fig. 3.11 View roller supp rts coordin tes 11

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If the analysis

as been run to

enerate

est support roller coordinat s (the

coordinat s of stinger tip r ller is lo est). Th result

ill show in “Roller Supports

Coordina es” frame. The coor inates here always refer to th B.O.P. ( ottom Of ipe) poin of pipe, which is the lowest point of pipe cross section. (4) Click “Laybar e and Sti ger Confi uration” t view it.

Fig. 3.12 View lay arge and stinger confi uration

“Layba ge and Stinger Con iguration” frame will show the alculated laybarge nd stinger configura ion para eters, su h as tang nt point n the bar e, roller heights an length o link beams. Where: “Tange t X”: Tangent point etween pipeline and horizont l plane o the plan specified by “Pipeli e angle” n the bar e, unit is meter. “Link L ngth”: Le gth of lin wire bet een cent r of pulley wheel on stinger A-frame and the first s inger section, and length of puppiece be ween stinger sectio s, unit is

eter.

“Stinger Upchord Angle”: A gles of stinger upchords, unit is degree. “Barge Roller Height”: Roller heights f support roller on l ybarge fr m bow to stern, uni is meter. “Stinger Roller H ight”: Roller heights of suppo t roller on stinger fr m bow to stern, uni is meter. All the information about tensioners will show in bold.

hen so e error occurs, the

correspo ding text output in “Roller Supports Coordinate ” and “L ybarge a d Stinge Configuration” frame will sho in red o blue, which means the roller support i higher o 12

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lower than the pip line, and “Laybarg and Sti ger Configuration” rame will show the separatio between roller supports and ipeline. Both “ oller Sup orts Coor dinates” a d “Layba ge and S inger Configuration” frame will show fault messag s if the increased e ror exceeds the “M x Error” nd the pr gram can not gene ate a lay arge and stinger configurati n by the given pip line bending radius within the max allo ed error. (5) Cli k “OFFPI E Input File” in th tree vie

to tran form the present e gineering

parameters to OFF IPE input file to be alculated by OFFPI E. Click t e button to save the OFFPIPE input file.

Fig. 3.13 iew OFFPI E input file

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Fig. 3.1 View anal sis result

(6) Click “Analysi Result” in the tree view to vi w the fini e elemen analysis esult, and click the utton to s ve it. (7) Click “View C art” in the tree view to view analysis res lt by char s.

Fig. 3.15 View hart

In whic : The chart in the middle of main interface is u ed to output analy is results, variables shown can be contr olled by “ Axis” and “Y Axis” r adiogroup by right side. 14

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“Save

icture” button: Save the chart as a pictu e file.

“Import OFFPIPE” button: IInduce O FPIPE a alysis results into t e chart t

compare

with the r sult calc lated by l cal core. On the ot er hand, this button can be used to filte OFFPIPE output files, which are com licated in format a d difficult to read by drawing software. Users can induce an OFFPIIPE output file and then vie the file filtered b checking the outpu file with the same ame in “ ILTERED OFFPIPE” folder in OFFPIPE Assistant directory. “Max S ress (MP )” edit: S ow maxi um stress of analysis result. (8) Click “View 3 Model” t view 3D In the 3D model

odel of calculated rofile of pipeline an stinger.

indow, “Roller State” checkbo is used t control whether to how rolle

support errors. Wh n the roll r support is higher than pipeline, it shows red, w en lower, shows bl e, when the pipeli e B.O.P. is within he roller support a justable ange, the support s ows green. "Stress State" checkbox is used to ontrol wh ther to s ow pipeli e stress state. The pipeline shows red t the nod in which otal stres > SMYS. Other col r means total stress < SMYS t this nod . Here is stress of

ed > Yell w > Gree > Sky Bl e > Deep Blue.

Fig. 3.16 View 3D Model

Some unctions in the tree view can be directly conduc ed from buttons. Just try it b yourself.

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ain men

and tool

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4 FAUL MESS GES &

OTES

Some f ault mess ges may e encoun tered by users and otes are listed belo : 1. A message window as Fi . 5.1 sho s.

Fig. 5.1 Fault messa e window

How to solve: Make sure to fill all the blank comboboxes and

dits befo e clicking

“Calculat ” button. 2. Soft are can not be started or run. How to solve: Please insert the attached hard lock into on of USB ort in you PC. 3. Please note t at the local FEA element analysis

ore of O FPIPE AssistantTM only pro ides finite

ith linear constitutive model. Nonline r model is valid

OFFPIPE calculation core is specified.

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5 TECHNICAL SUPPOR & AUT ORIZA ION For technical support and aut orization f OFFPI E Assista tTM, please visit: http://ww .offpipea sistant.com or contac : support@offpipeas istant.co

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