Piping Engineering Manhours Estimation

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Manhours Estimation is a Critical Activity during Bid Stage as well as during project execution. It helps keep design cost in control. Piping Manhours are generally divided into 4 Categories.

Piping Design Manhours Estimation

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
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Piping Material Control Manhours Estimation

Piping Material Control involves various activities such as preparation of Material Management Criteria, Review of PID,s, MTO at various Stages. Typical manhours required for each of these activities are as follows.

Sr. Activity/Unit Hours
1 Material Management Criteria with PID Review / Per PID 3
2 Preliminary Material Take-Off and Request For Quotation / Per Isometric 0.5
3 Intermediate Material Take-Off and Purchase Order / Per Iso 1
4 Final MTO : Manual / Per Iso 1
5 Final MTO : From 3D Model / Per Iso 0.5
6 Material Shortage / Overage Report / Per RFQ, PO 80
7 Supervision Activities : 10% of Above Total 10%
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Piping Material Engineering Manhours Estimation

Piping Material Engineering involves various activities such as preparation of Piping Material Specification Notes and Data, Preparation of individual Material Classes,  Preparation of Enquiry and Purchase Specifications, Special Items List and Data Sheets, Valves Data Sheets etc. Typical manhours required for each of these activities are as follows.

Sr. Activity/Unit New Update
1 Preparation of Piping Material Specification Notes and Data : Total 20 5
2 Individual Piping Material Classes 20 4
3 Enquiry / Purchase Specifications for Pipes, Valves, Fittings / Per Spec. 5 New
4 Testing, Cleaning, Passivating Specifications / Per Spec 20 5
5 Special Items List/Data Sheets/Spec / Per SP Item 8 4
6 Insulation, Coating, Painting, Lining Specificaiton / Per Spec. 20 5
7 Welding / NDE Specification 20 5
8 Project Commodity Catalog : Total 8 New
9 Line List Index Development/Maintainence / Per line 0.5 0.5
10 Supervision of All Above Activities : 10% of Total Above. 10% 10%
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Piping Stress Analysis Manhours Estimation

Piping Stress Analysis involves various activities such as preparation of stress critical lines list, modelling of lines in stress package such as CEASAR II, analysis of lines, marking of supports, creation of stress packages and updations/creation of stress design criteria. Typical manhours required for each of these activities are as follows.

Sr Activity/Unit Hours
1 Study of Project Specificaitons and Bid Documents. 40
2 Creation of Stress Design Criteria/Instructions from Bid Documents. : Total 40
3 Listing/Defining Stress Systems from PID : Total 20
4 Preparation of Stress Critical Lines List : Total 40
 5  Stress Analysis and Supporting of Critical Lines/ Per Line  12
 6  Preparation of Stress Reports / Per Report 10
 7  Spring Data Sheets, Index, TBE / Per Spring 3
 8  Special Support Design and Index / Per Support  4
9  Expansion Joint Data Sheet, Index, TBE / Per Joint  3
10  Sway Braces Data Sheets, Index, TBE / Per Brace 4
11  Struts Data Sheets, Index, TBE / Per Stress 4
 12  Support Markup of Non Critical Lines / Per Line  1
 13  Trunions Calculations / Per Calculation  2
14 AFC Isometric Stress and Support Review / Per Iso 0.5
15 Supervision and Co-ordination : % of Total of Above 10%

Supervision and Co-ordination activities includes :

  1. Review of Stress systems.
  2.  Vendor communication.
  3. Interdepartmental communication with Civil, Mechanical and process department.
  4. Job close out report preparation.
  5. Other miscellaneous activities which are not listed above
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Piping Lead Engineer Manhours Estimation

Piping Lead Engineer has to perform various activities to ensure smooth execution of piping engineering work with appropriate quality control. Some of such activities are Field Trips, Preliminary Job Site Survey, Fabrication Inspection Trips, Support Activities, Front End Planning etc. Typical manhours required for each of these activities are as follows.

Sr. Activity / Unit Hours
1 Preliminary Job Site Survey : Field Trips / Per Day 8
2 Construction Work Package Preparation / Per Package 20
3 Construction Support Trips / Per Week 40
4 Fabrication Shops Survey / Per Day 8
5 Department Management Review / Per Meeting 2
6 Technical Support Activities / Per Day 2
7 Technical Assistants (Area Engineers etc.) / Per Week 80
8 Front End Planning : One Time 120
9 Supervision Activities : 10% of Total Above 10%
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