Attock Oil Refinery
Refinery Up-gradation Project Rawalpindi, Pakistan
A turnkey project managed by Mitsui Engineering and Shipbuilding Co. Japan. The project include civil, structure & building design work for heavy Crude unit & Reformer unit, Naphtha Hydrotreating processing unit, fixed bed Platforming unit; including roadways and pavements; drainage & under ground piping network, electrical duck banks & cable trenches, concrete foundations, steel structures & pipe racks, civil mechanical & plumbing design, checking and reviewing of steel shop drawings and vendor prints; supervision and management of works in all engineering aspects.
All design calculations and drawings were documented and compiled according to ISO standards as per client’s requirements.
Structural Steel Pipe Racks
Pipe racks to support oil transporting pipes in the Crude and Reformer units. Multilevel pipe racks were also designed to support compressors, motors and other mechanical equipments installed at different levels. Analyses of these structures were performed in SAP90 (Structural Analysis Program) and steel structure stress check was performed using the software’s post processor SAPSTL for both American and Japanese sections. Pipe racks with varying sizes from a length of 65m, width of 9m and a maximum height of 30m at mid spans were modeled for three-dimensional structural stability limiting the lateral deflections to 25mm due to mechanical/piping constraints. Two-dimensional analysis was performed against roughly calculated loads to obtain the tentative sizes of the members before building a 3D model for precise analysis. More than 1500 frame elements contributed in defining the geometry of each structure to analyze three-dimensionally against the accurately calculated dead, live, wind and earthquake loads. Thermal loads were also considered to cater for the piping stresses due to temperature variations and the structural self-weight was applied by activating the member weight option during runtime. Frame members end moment releases were activated to behave as pin connections for a realistic model. Isolated spread footings were designed for each column connected with beams in the lateral direction. Spreadsheets were generated to design the foundations against a number of load combinations. Design calculations and structural drawings with proper details and sections were produced as per international quality standards. |
Miscellaneous foundations
Foundations for motors, compressors and pumps lying on ground with manual calculations and by using specifically generated spreadsheets. Designs were performed against static loads only. Design calculations and structural drawings were wetted and approved by MES engineers before final issue. |
updated: June 2002