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Work Instruction - Yibal Khuff - Mechanical - Static Effect of Nozzle Loads on Horizontal Equipment and Foundation Design 1
Scope This work instruction is prepared to standardise the method for transferr ing the nozzle loads (Force and moments) to the base of the saddle of horizontal equipment and foundation design for Yibal Khuff project. The procedure is prepared with a focus on limitations in commonly used mechanical design software (PV-Elite) in considering the global forces and moments in support analysis and foundation load data calculation. If any other software is used same needs to be modified accordingly. Engineers implementing this procedure are encouraged to discuss with lead engineer in case of any clarification / concerns.
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References KHF-00-104133-MS-7771-00001-0000 KHF-00-104133-MS-7771-00001-0000_Rev. _Rev. 03 : Technical Specification of Vessels 31.22.20.31_Version 35 : PRESSURE VESSELS (BASED ON ASME SECTION VIII) Pv-Elite User Manual
3
Qual Qualif ific icat atio ion n and and Assu Assump mpti tion on.. 1. As per requirement of Project specification only top process nozzle forces and moments to be transferred to foundation. Hence nozzle on dish ends and on the bottom of the shell has been excluded for further analysis. 2. Torsional moment (MT) is assumed to be have only local effect and hence same has not been transferred on to foundation. 3. Global force and moment coordinates direction in PV-Elite and Coordinate direction in technical specification of vessels nozzle load table are different. For easy understanding, in this procedure, direction has been considered inline with PV-Elite input. See Fig.1 and Fig.2 on sheet 2 4. Nozzle loads have been combined to other loads only for operating load case not for other l oad cases.
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Method Step -1
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Identify the nozzles to be considered for the transferring the nozzle force and moments moments to base. base. Enter the standard piping force/moments or actual piping force/moments as applicable in sheet 2. All input parameters are identified in light blue colour.
Step-2
Enter the PV-Elite input loads (See yellow cells) in the PV-Elite at respective nozzle location through force/moment input and check vessel design is ok or not. Modify design as required.
Step-3
Refer Additional instruction and points in sheet 2 for extracting foundation load data values from PV-Elite.
Cons Consid ider erat atio ion n for for diff differ eren entt forc force e and and mome moment ntss 1. Vertical loads (Fy) Vertical loads direction has been considered -ve as this will increase loads on the s addle/foundation and its conservative. 2. Transverse Force (Fz) PV-Elite considers the global force input as acting on the centre line of the vessel. However, in reality the loads acts at the nozzle nozzle and shell junction. Hence to simulate actual condition in the software, moment arm to be factored by ratio of actual moment arm (saddle height + vessel radius) / saddle height. For the purpose of this procedure Saddle height is considered from centre of the vessel centre line.
3. Circumferential Moment (Mx) PV-Elite does not have provision for inputting the moment hence this moment need to be converted to equivalent force by dividing with saddle height. This equivalent force of Mx is input in Pv-Elite by adding to transverse force Fz as calculated in point no. 2 above to arrive total transverse force Fz.
4. Longitudinal Force (Fx) PV-Elite consider global force acting on the centre line of the vess el. However, in reality the loads acts at the nozzle and shell junction. Hence to to simulate actual condition condition in the software, moment moment arm to be factored factored by ratio of actual actual moment arm (saddle height + vessel radius) / s addle height. Global Longitudinal force (Fx) is not being added by PV-Elite to wind and seismic shear force hence governing Wind/Seismic Longitudinal shear force need to be added user defined global force separately.
5. Longitudinal Moment (Ml) PV-Elite does not have provision for inputting the moment hence this moment need to be converted to equivalent force by dividing with saddle height. This equivalent force of Ml is input in Pv-Elite by adding to Longitudinal force Fx as calculated in point no. 4 above to arrive total longitudinal force Fx. 6
Calcul Calculati ation on and Founda Foundatio tion n Load Load data data on GA drawi drawings ngs Refer Sheet No.2
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Figures Refer Sheet No.2
Equipment Tag Vessel Diameter Vessel Radius Saddle height from Vessel Centreline Wind Long. Load Seismic Long. Load
Nozzle Tag (Add All Top Process Nozzles)
R-4501 / R-4601 2.5 meter 1.25 meter 2 meter 7.76 kN 84.23 kN
Instruction / Help (in blue colour) - See shee t 3
From PV-Elite Output See point 1 From PV-Elite Output See point 2
Values as per specification table / Piping Actual Loads
PV-Elite Input (See Fig.3)- Add at nozzle location as separate force
Nozzle Tag Fx (FL) Fy (P) Fz (FT) Mx (MC) My (MT) Mz (ML) Fx Unit kN kN-m N1 36 -40 50 71 71 94 N3 36 -40 27 54 80 98.5 XX 0 0 0 0 0 0 XX 0 0 0 0 0 0 Ignored XX 0 0 0 0 0 0 XX 0 0 0 0 0 0 XX 0 0 0 0 0 0 XX 0 0 0 0 0 0 XX 0 0 0 0 0 0 Total of nozzle loads 192.5 Maximum of wind or seismic longitudinal load (Add as user defined g lobal force) 84.23 Foundation Load Data on GA Drawing (For operating case other cases to follow on same line) Left saddle Right Saddle Vertical Saddle Load - kN Sliding Fixed Specify as per GA (Including effect of piping load) 363 362 From PV-Elite Output See Point 3 Due to Wind / Seismic (Operating Case) Transverse Wind Shear (Per saddle)- kN Transverse Wind Moment (Per saddle)- kN-m Transverse Seismic Shear (Per saddle)- kN
32.7 65.4
32.7 65.4
From PV-Elite Output See Point 4
42
42
From PV-Elite Output See Point 5
Transverse Seismic Moment (Per saddle)- kN-m
84
84
Longitudinal Wind Shear (Fixed saddle Only)- kN
N.A.
7.76
Longitudinal Wind Moment (Fixed saddle Only)- kN-m
N.A.
15.52
Seismic Shear (Long - Fixed saddle Only)- kN
N.A.
84.23
Seismic Moment (Long - Fixed saddle Only)- kN-m Due to Piping Nozzle Loads (Operating Case only)
N.A.
168.46
Transverse Shear (Per saddle)- kN Transverse Moment (Per saddle)- kN-m
121 242
66 132
Longitudinal Shear (Per saddle)- kN
N.A.
192.5
Longitudinal Moment (Per saddle)- kN-m Friction Loads
N.A.
385
Friction factor
0.4
N.A
145.13
N.A
Friction load - kN Figure 1_PV-Elite
Figure 3_Global Force/Moment Input
Fy kN -40 -40 0 0 0 0 0 0 0 -80
Fz 116.75 70.875 0 0 0 0 0 0 0 187.625
0
0
From PV-Elite Output See Point 1 Not applicable for sliding saddle, accordingly take care From PV-Elite Output See Point 2 Not applicable for sliding saddle, accordingly take care
From PV-Elite Output see point 6 From Total Fx force for all nozzles Not applicable for sliding saddle, accordingly take care
PV-Elite Output see point 7 See PV-Elite input for fixed saddle s hall be zero for sliding shall be based on arrangement selected.
