Piping Design Manhours Estimation

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Piping Design Engineering involves various activities such as preparation of Plot Plans, Equipment Layouts, Equipment 3D Modelling, Pipelines 3D Modeling, Isometrics Extraction, Checking. 3D Model Review, Piping Layouts etc. Typical manhours required for each of these activities are as follows.

Sr. Activity / Unit New Update
Piping Specifications
1 Piping Layout Specification / PDB 40 10
2 Shop Fabrication Specification 40 10
3 Field Fabrication Specification 40 10
4 Tie Ins Specification 40 10
5 Geo-graphic Color Code Specification 40 10
6 Heat Tracing Specification 40 10
Direct 2D Cad Drawings
 1  Plot Plan Drawing 100  80
2  Equipment Layouts 100  40
 3  Piping Standards and Details Drawings / Per Drawing  40  10
4  Manual Piping Layout Drawings / Per Drawing 140  New
5 Manual Isometrics : New Lines / Tie Ins 8 New
6 Revise Existing Piping Plan Drawings 40 NA
 7  As Built Piping Plans – Manual 20  NA
8 Piping Heat Tracing Drawings 5 5
3D Modelling Workflow
1  3D Modelling : Equipments / Per Equipment 6  6
2 3D Modelling : Piping and Supports  4  4
3  Isometrics Extraction / Per Drawing 1  1
4  Piping Layout Extraction and Update / Per Drawing  40  New
Other Work
1  Vendor Drawings Checking/Drawing  1  NA
2 Non CAD Demolition Drawings 15 New
 3  Piping Drawings/Models etc. Index 20  New
 4  Designer Field Trips / Per Day  8  NA
5 Tie-In List / Per Tie In 1 1
6 3D Admin / CAD Co-ordinator / Per Week 40 NA
7 Isometrics Drawing Index / Per Isometric 1 1
Supervising Work
1 10% of Total Manhours Above 10% NA