Tank Farm Field Construction Work Progress Measurement System- Sample Template for Practical Use

Please download to get full document.

View again

of 7
34 views
PDF
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Document Description
In construction projects Inch Dia unit of Measure is used to measure the progress of Piping Spool fabrication.
Document Share
Documents Related
Document Tags
Document Transcript
  http://www.toolboxforplanning.com/2013/06/tank-farm-field-construction-work.html#more Tank farm mechanical construction progress calculation sheet (system) would be an excellent resource for those who have never done field fabricated above ground tank construction work. The basis of an external floating roof type, tank farm construction progress calculation sheet/system is mainly depending on (1) Scope : Mechanical work for an external floating roof type, single deck with internal pontoon type for oil and fuel storage above ground tank. Civil foundation, cathodic protection work, fire system, cabling works and instrumentation works are not included in this calculation sheet. Engineering details design is done by Owner or EPC Contractor. (2) WBS (Work Breakdown Structure) : As described on Progress Calculation/Tracking System for Oil and Fuel Storage Tank Fabrication.  (3) Work Steps and Weight Factor: Field Construction for Each Construction Steps Method of progress calculation is the same as Progress Calculation/Tracking System for Fabrication. The only difference is construction work steps and weight factors. The details are as the following. Tank Bottom and Floating Roof Plate Field Erection Work Steps and Weight Factors  Field erection works steps for tank bottom (annular plate, sketch plate and rectangular plate) and floating roof (centre deck plates, pontoon plate and stiffeners) installation are 1) Position/lay plate, alignment and fit-up and tack welding (short-seam) 2) Full Welding (long-seam) and NDT (e.g. LPT at center deck, pontoon deck, RT test, etc.) 3) Field Blasting/Primer at field weld joints/Final Coating (if carbon steel tank) 4) Final inspection as per API 650 or Owner’s specific requirements Tank material at erection area is added as part of construction progress calculation assuming that  prefabricated materials are delivered by Contractor. Once again, decision on whether it will be included or not depends on company specific requirement and client’s approval. Work steps weight factor needs to be adjusted so as to facilitate exclusion of that work step. Use the sample work steps and weight factor table below for starting point.  Work Steps   Weight Factor   Material at Erection Area  5%  Lay Plate/ Alignment & Fit up welding  35%  Full Weld/NDT  45%  Field Blasting/Final Coating  10%  Final Inspection  5%  Tank Shell Side Field Construction Work Steps and Weight Factor  Shell plate field erection work steps includes as minimum, 1) Position, alignment and fit-up and tack welding 2) Full Welding at both sides(Front & Back joints) and Inspection (DP Test/NDT) 3) Field Blasting/Primer at field weld joints/Final Coating (if carbon steel tank) 4) Final inspection as per API 650 or Owner’s specific requirements  Then, they are listed in Work steps and % weight table for physical progress calculation. See a sample table below. Work Steps   Weight Factor   Material at Erection Area  5%  Position Plate/Alignment & Fit up Welding  35%  Full Welding both sides(Front & Back) /NDT  45%  Field Blasting/Final Coating  10%  Final Inspection  5%   Tank Accessories and Fittings Field Construction Work Steps and Weight Factors for Physical Progress Calculation Two different work steps weight factor tables are made in this system as the construction method for tank external accessories is different from internal apparatus. This will help you to track the  progress closely without distorting overall construction progress. (a) Construction work steps for tank external accessories installation at site includes (1) Member Assembly: -Lift the each section of prefabricated spiral stairway and welding onto tank body (Shell side), - Lift prefabricated platform and handrail materials on to tank roof, welding onto tank body and final bolt up - Lift prefabricated rolling ladder/rail tracks and handrails on to tank roof, welding on centre deck and final bolt-up with gauger platform (2) Final inspection as per API 650 or Owner’s specific requirements Then, the sample work steps and weight factor table can be used for tank external accessories conduction physical progress measurement. Work Steps   Weight Factor   Material at Erection Area  5%  Member Assembly  85%  Final Inspection 10%  (b) Construction work steps for tank internal accessories and nozzle installation at site includes 1) (Marking & Cutting for Nozzle holes, Alignment & Fit-up Welding for all) includes - Marking/cutting on nozzle locations, install reinforcement pad and fit-up weld with pre-fabricated nozzle, Alignment & fit-up/tack welding of pontoon legs, center deck support legs and gauge poles 2) Full Welding/NDT  3) Field Blasting/Primer at field weld joints/Final Coating (if carbon steel tank) 4) Final inspection Then, the work steps and % weight table for physical construction progress can be defined as below Work Steps   Weight Factor   Material at Erection Area  5%  (Marking & Cutting for Nozzle holes, Alignment & Fit up Welding for all)  35%  Full Welding/NDT  45%  Field Blasting/Final Coating  10%  Final Inspection  5%  Once you get construction work steps and weight factors above,.......   Apply Construction Work Steps and Weight Factors in Quantity and Physical Progress Calculation Sheet  As described in fabrication progress sheet, list the tank components, man hours, weights, etc. so as to track and monitor the status of each member to high level WBS which is in line with GA drawing. Firstly, find the quantity progress calculation sheet on “ Field Installation Status-Qty ” tag. Spread sheet is filled with complete data so as to show progress calculation sheet work. Construction work step progress for each member can be tracked by entering each work step  progress status. See the below snapshots of field erection progress updating section for tank  bottom and roof plate erection work,
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks