Proposed solutions for all identified and viable root causes
Proposed solutions 1. Procurement of
Pros
Cons
• Uniform column ID
• Raw material cost will increase • Transportation cost will increase • Handling charges will increase • High delivery time • Column ovality during transportation may occur • Rectification (if any) is difficult at site • Required column thickness may not be available in standard pipe • Standard column ID cannot be customised according to process requirements • Standard seamless pipe readily available only for 10-12’’ NB size • Column ovality during transportation may occur • Rectification (if any) is difficult at site
customised plate length
throughout the column length
2. Fabrication of column using standard seamless pipe instead of plate
• Uniform column ID throughout
the column length
• Fabrication cost will reduce • Fabrication time will reduce
3. Installation of cartridge trays at column vendor shop by tray vendor with separate MR
• Rectification work (if required) at column vendor workshop is easier
• No single point responsibility
in project management
and cost effective
• Equipment delivery will get delayed due to involvement of two separate
• Reduce standard installation time
at site
agencies
• Prevent column from deforming its shape due to self-weight during • Zero rework/repair activity at site • Elimination of crane requirements for installation of trays at site transportation • Project management through single point responsibility vendor • Rectification work (if required) at column vendor workshop is easier • Reduce standard installation time at site • Prevent column from deforming its shape due to self-weight during transportation • Zero errors in mismatching of column ID and tray OD at site • Zero rework/repair activity at site • Elimination of crane requirements for installation of trays at site and cost effective
• Coordination issues between column
vendor and tray vendor • Vendors may face LD (Late
delivery) charges
• Errors in matching of column ID and tray OD • Challenges in procuring column through this philosophy • Transportation cost may increase or decrease based on shop locations • Supply cost may increase because column vendor may add its profit of both the vendors
4. Single point responsibility vendor for column and tray under RFQ and installation at shop
margins
Table 3
and supervisors (Nalin Kumar- ED(T), Arun Kumar (HOD-MTMS), and Inder Kumar (Sr.GM-MTMS)), who helped him in completing this work.
Limited’s Mass Transfer Mechanical and System Department in the Equipment Division. He has more than 17 years of experience in design, engineering, and troubleshooting of column trays, internals, and other mass transfer equipment in grassroots and revamp projects. He holds a bachelor’s degree in mechanical engineering and a Diploma in mechanical engineering with specialisation in power plant engineer- ing. Email: urmilesh.tiwari@eil.co.in
Reference 1 Optimising cartridge tray installation, PTQ Revamps, 2024.
Urmilesh Tiwari is an Assistant General Manager in Engineers India
www.digitalrefining.com
Revamps 2025
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