Epc project interdepency and Work Flow- promo

EPC Project Interdependency

and

Work Flow

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Table Of Contents

Topic Page

Introduction to EPC Project Management 5

EPC Project Management work flow 13

Engineering Document Issuance Purpose 19

Engineering Work Flow 21

Procurement work flow 43

On Shore Project Schedule and Schedule dependency 46

Work Front Concept 48

Advance Work Packaging 52

Sample WBS 65

Piping Engineering as case study 73

Vessel Fabrication Work flow as case study 83

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Don’t be like this…

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EPC Project Management

- Introduction

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EPC stands for Engineering, Procurement, Construction and is a prominent form of contracting agreement in the construction industry. The engineering and construction contractor will carry out the detailed engineering design of the project, procure all the equipment and materials necessary, and then construct to deliver a functioning facility or asset to their clients. Companies that deliver EPC Projects are commonly referred to as EPC Contractors. The EPC phase of the project is also known as the Execution phase which normally follows what is know as a FEED or Front End Engineering Design phase. The FEED is a basic engineering design used as the basis for the EPC phase. The FEED can be divided into separate packages covering different portions of the project. The FEED packages are used as the basis for bidding on when the client offers the EPC work to the market. Under an EPC contract, the contractor designs the installation, procures the necessary materials and builds the project, either directly or by of the work.

In some cases, the contractor carries the project risk for schedule as well as budget in return for a fixed price, called lump sum LSTK depending on the agreed scope of work. EPCM stands for Engineering, Procurement, Construction Management. This type of contract is different to an EPC Contract in that the Contractor is not directly involved in the construction but is responsible for administering the Construction Contracts. EPCI stands for Engineering Procurement Construction and Installation which is a common form of contracting arrangement in the Offshore Construction Industry. As opposed to an EPC contract, the offshore facility or vessel that is constructed has to be transported and installed at the project location. EPIC stands for Engineering Procurement Installation Commissioning is typically a Lump Sum Turn Key (LSTK) type Contract integrating the responsibility going from the conception to the final acceptance of one or more elements of a production system. It can be awarded for all, or part, of a field development.

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EPC Project Organization

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http://www.ignitetribes.com/

EPC Project Organization

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Design Procurement Manufacturing/

Fabrication Shipment

Installation Construction &

Erection Inspection & FAT Hand-Over

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Engineering in the Project

11


Engineering Discipline

12


- Work Flow

13

Engineering work flow concept is required to be fully understand for someone who involved in the EPC Planning and Activity Sequencing. This concept is applied when the EPC level 4 schedule is developed. The process of engineering work to produce the required deliverables depends on not only within the functional discipline itself but also among the process, mechanical and piping engineering functions. Engineering in EPC project is the task of translating a set of functional requirement into a full set of drawings and specifications depicting every detail of a facility, Engineering involves varieties of specialties, which include : • Process •Civil and Structure •Mechanical •Piping •Electrical •Instrumentation •General Engineering •Safety

Engineering Work Flow

There are many interdependencies between engineering documents. For instance piping routing drawings are issued after the process diagram Is defined. Most of the documents will usually issued several times, at different stages to for review as well as to incorporate the comments. Typically a document is first issued for Internal Review (IFR) of the other disciplines, then to client for comment (IFC), it will be returned to be incorporated with the client comments and issue for Approval (IFA), then for construction (IFC) and last once everything is confirmed and will Approve for Construction (AFC)

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The entire strategy is dependent on Engineering and Procurement providing their deliverables to meet Path of Construction. Contractor mobilizes based on Engineering forecast of IFC EWPs (Engineering Work Packages).

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Engineering Work Flow

Engineering Disciplines

Activity Process Civil and Structure

Mechanical Piping Electrical Instrumentation

Diagrams

Geographical Drawing

Architecture Drawing

Calculations

Equipment or material spec, data sheet & requisition

Site work spec

Engineering phase is very much concerned with documentation.

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From Sequential To Concurrent Execution

Engineering Procurement Construction

Engineering

Procurement

Construction

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Project Execution

The Past: sequential execution

The Present: concurrent execution

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- Engineering Document Issue Purposes

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Issuing Purpose

FYI For Your Information IAB Issued For As-Built ICR Issued For Construction Record IFA Issued For Approval IFB Issued For Bid IFC Issued For Construction IFD Issued For Design IFE Issued For Estimate IFH Issued For Hazop IFP Issued For Purchase IFR Issued For Review IFS Issued For Squad Check IFU Issued For Use IFV Issued For Void RLM Red Line Mark-up RTS Return To Supplier SFR Supplier Issued For Review SFS Supplier Issued For Squad Check AFC Approved for Construction

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- Engineering Work Flow

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Engineering Workflow

22 Source : Herve Baron Oil & Gas Engineering Guide slideshare


Engineering Workflow

23 Source : Herve Baron Oil & Gas Engineering Guide slideshare


Engineering Document Review Cycle

Step Review cycle Rule of credit

Increment % Cumulative %

1 Study and design preparation 5% 5%

2 Issue for review (IFR) 10% 15%

3 Issue for approval (IFA) 20% 35%

4 Issue for construction (IFC) 30% 65%

5 Approved for construction 35% 100% 24

Engineering Document Review Cycle

IFR IFA IFC

P&ID REVIEW

HAZOP

PIPING MTO & PO

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Document Control

Engineering

Client

Vendor

Documents submitted to client

Approval/ Comments

Documents submission Comments

•Client Review cycle. (IFR,IFA,IFC,AFC) •Client Review duration

•Engineering submission cut-off •Maintain internal and external baseline

•Vendor information criticality for client doc approval

•Vendor duration to incorporate the comments •Vendor delivery estimation

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Vendor Data

Engineering is the integrator of the Plant equipment, and is highly dependent on vendor data

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Engineering Work Flow – Process Design

Process Design

PFDs H&M balance

P&IDs

Process data sheet

Equipment specification

Vendor drawings

Rotating Pressure vessels Heat exchangers Fired equipment Packages etc.

Layout Civil Electrical

Piping

Instrumentation

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Piping Engineering Flow

PFD

Process equipment

list

Piping isometric

drawing IFC

Stress ok ?

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3D

Modeling

(General)

1st Model review

2nd model review

3rd model review

3D

Mo

de

l

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3D

Modeling

(Skid

Project)

1st Model review (30%)

2nd model review (60%)

3rd model review (90%)

3D

Mo

de

l

IFA pipe support dwg

IFA pipe GA dwg

IFA piping plan dwg

IFA structural GA

IFA tubing routing layout

IFI pipe ISO

IFA Instrument cable routing layout

IFA instrument cable trench &tray layout

IFA Instrument location

IFA Skid Tie-in report

IFA General structural deflection

& stress analysis report

IFA Structural GA dwg

IFC Instrument location dwg

IFC pipe GA dwg

Piping Materials

P&IDs 1st issue

Plot plan

IFD P&IDs

E&I main cable routing

First equipment vendor dwg

IFC piping ISO

Final piping MTO

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Skid 3D Modelling – Interdependency

30% PDMS

30% model review

Update PDMS model 30%

Issue close out report

Report review by EPCC contractor

60% PDMS

60% model review



90% PDMS

90% model review


Issue close out 90% report

Report review by EPC contractor

Receive final comment from EPC contractor

Successor for 60% PDMS (issue close out report)

IFI for piping ISO

IFI [Piping Isometric]

IFA cable routing layout

IFA instrumentation location

IFA pipe support drawing

IFA piping GA drawing

IFA piping plan drawing

IFA structural GA drawing

Successor for 90% PDMS (issue close out report)

EPC contractor review piping GA

EPC contractor review piping plan

EPC contractor review pipe support

EPC contractor review structural GA

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Skid 3D Modelling – Piping GA as example

30% PDMS

30% model review



Report review by EPCC contractor

60% PDMS

60% model review



90% PDMS

90% model review


Issue close out 90% report

Report review by EPC contractor

Receive final comment from EPC contractor

Prepare and Submit IFA Rev.A [Piping GA Drawings]

EPC Contractor Review [Piping GA Drawings]

Incorporate Comments & Submit IFC Rev.0 [Piping GA Drawings]

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Engineering Work Flow-Process, Mech and Piping

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Engineering Work Flow –C&S, Mech and Piping

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Engineering Work Flow – E&I

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Engineering Work Flow – Instrumentation

•Instrument Index

•Instrument Data sheet

•Instrument Hookup Diagram

•Instrument Loop Diagram

•Instrument I/O List

•Instrument Layout Diagram

•Cause & Effect Diagram

•Cable Schedule Diagram

•Project Interconnection Diagram

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I/O List is a contains list of instrumentation which serve as an input or output of control system. Hence the tag number that physically has a cable which connects to the control system appears on I/O list.

Instrument index is a document containing list of instrument devices within a plant. Instrument index shall include tag number of all physical instruments

Reference Drawing P&ID, HMB

Instrument Index Reference Document

Cause & Effect

I/O Count will determines the required capacity of a system

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Instrument Data Sheet is a document containing specification and information of an instrument device. It specifies general information of instrument such as tag number identification, service description, location (line number/equipment number), P&ID number or drawing number reference, process data (if applicable), calibrated range (if applicable), material, performance details (such as accuracy, linearity – if applicable), hazardous certification (for electrical device), accessories required, etc. The details of information in data sheet may differ among each types of instrument such as transmitter, switch, gauge, control valve

Instrument Data Sheet

Reference Drawing P&ID, HMB,

Reference Document Instrument specification, piping specification, calculation, vendor catalogue

Once the data sheet completed, it is attached to requisition which to be sent to vendors. Vendors will offer their quotation with various model and manufacturer among the offers. Having been considered its technical and commercial aspects, the instrument is purchased. Following the purchase order, vendor will submit supporting document and drawing. Based on vendor data, instrument data sheet may be updated to accommodate details to make the data sheet “as-built”.

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Hook-up drawing is a detailed drawing showing mounting and connection of instrument to process lines and corresponding list of required material.

Hook-up drawing also gives information the requirement of bulk material for each installation. It also details its specification (size, type and material) and the quantity.

There are two types of hook-up drawing: 1. Process Hook-Up This hook-up drawing contains typical installations for instrument which connects to the process 1. Pneumatic Hook-Up

Hookup Drawing

Reference Drawing P&ID, Installation Detail

Specification, Piping Specification

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Instrument Layout is also known as instrument location plan. This drawing shows the exact position of each instruments with reference to plant layout.

The point indication of instrument position and its mounting stand where instrument to be mounted and process tap location.

Often the tap location and the instrument is separated quite distant. In some project, it is not mandatory to show the process tap location

Instrument Layout

Reference Drawing P&ID, Piping

Plan,piping GA and ISO

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Cable Schedule is a document containing list of instrument cables to install, cable type, length, origin, destination and route.

Reference Drawing Instrument Cable Layout,

Interconnection block diagram

Cable Schedule Reference Document

Instrument Index / I/O List

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- Procurement Work Flow

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Procurement Work Flow

Inquiry issued to bidders

Tender Evaluation and client approval

Purchasing request created

Purchasing order placed

Received Key vendor drawings

Approved key vendor drawings

Fabrication FAT or Final inspection

finished Ex-work

Delivery at site

General procurement work flow and how rule of credit being assigned to each step.

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Procurement Work Flow

Procurement progress calculation excel sheets are available for download in ignite.com

Progress tracking sheet for procurement work flow

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Typical On-Shore Project Schedule and

Dependencies

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Work front Concept

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Work Front

Engineering progress is commonly measured by assigning a weight, usually the required number of required manhours, to each task/deliverable. Once the task is performed/ the deliverable is issued, the corresponding manhours are earned. The earned progress divided by the total number of manhours gives the % progress. As each engineering task/deliverable is scheduled at certain dates, it is possible to anticipate the progress that should be earned at a given date. It is the planned progress. At regular period, usually on a monthly basis, the actual progress of each activity/deliverable is measured against the planned progress. An actual progress less than the planned progress might show a lack of resources and a need for increased mobilization to get back on plan, following a (re-)forecast progress curve. Although such progress measure is commonly used, it could be deceiving. It indeed reflects rather well the progress of engineering on its own but not how well is engineering supporting the Project schedule. Let’s consider that engineering must issue 2 material requisitions, an urgent one for a Long Lead Item and another one which is required later on. Engineering will earn progress whatever requisition it issues, even if putting the Project in delay by issuing the non urgent requisition first. One sees that the above measure of progress alone is insufficient. It must be complemented by monitoring that important Milestones are met. These Milestones are first of all, the ones associated with the issue of the Requisition for the equipment. Long lead items have naturally to be purchased early. All equipment and packages also need to be purchased as early as their technical definition allows. Indeed, engineering development is highly dependent on information from vendors. The sooner the purchase orders are placed the sooner the vendor information will be available. Next come the Milestones associated with Bulk Material Procurement to support construction, such as the Piping MTO and the Structural Steel MTO (for an off-shore Project).

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Work Front

Then come the Milestones associated with Construction. These are the IFC Plot Plan, a pre-requisite to start any site work, and the IFC P&IDs, a pre-requisite to the issue of Piping isometrics. The 50% IFC Piping isometric milestone comes next, which typically falls half way through the Project, as ensuing works, such as pre-fab and erection have a rather incompressible duration, due to site constraints (capacity of pre-fab shop, space constraints for erection limiting the progress). Even if engineering deliveries are in sequence, the above engineering progress measure might still be deceiving, as it will only reflect the amount of engineering work completed and not the workfront made available to construction. Let’s consider for instance that two foundations are to be cast. The first one is a very large foundation and the second one a small one. Issuing the drawing of either the large or small foundation will earn engineering the same progress, although it will open quite a different workfront to Construction. One sees the necessity to measure the issued Workfront. In the case of foundations, for instance, this will be done by monitoring the cumulative quantity of concrete (m3) of all issued IFC foundation drawings. Producing an S curve, such as the one shown in next slide, showing both planned and actually issued quantities will give a true picture of how well engineering is supporting civil works. One will similarly monitor, for an On-Shore project, the cumulative quantity of steel (tons) of issued IFC Structural drawings. The cumulative tons (or dia inch) of IFC issued Piping isometrics will show the available piping workfront. Such progress curves, showing the actual versus planned available workfronts are instrumental to monitor engineering progress, identify shortage and take corrective actions (increase mobilisation). It is not perfect however and can still be deceiving, in case of out-of-sequence issues: engineering may have issued drawings representing significant quantities, but that does not generate construction workfront as such works can not be performed at this time (due to lack of access or pre-requisite for another work to be completed before, for instance).

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Work Front

Construction work-front planning and forecasting processes allow Materials to gather construction work package requirements and material situation throughout the supply chain with appropriate feedback into the EP process 51


Advanced Work Packaging

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Work Face Planning

Path of Construction

EWP CWP FIWPs

500 – 1000mhrs

Construction drives Engineering & Procurement EWPs(Engineering Work Packages) are Engineering deliverables CWPs (Construction Work Packages)& FIWPs (Field Installation Work Packages) are Construction deliverables

System turn-over drives Construction

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Work Face Planning

EWPs (Engineering Work Packages) set the precedence for Construction work.

Using the P&IDs (for item count) and Piping Layout Drawings (for lengths) a preliminary list for piping material requirement generated which known as piping MTO (piping material takeoffs) The GA drawing used for pipe erection while the piping ISO are used for pipe prefabrication. 54


Planned Path in Construction Work

Engineering Work Package (EWP)

Procurement Package (PP)

Supplier Equipment / material

Construction Work Package (CWP)

9 weeks lag

Work commences

Equipment / Material arrives prior to work commencing Purchase Order to supplier

Engineering’s Bill of Material

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Planned Path in Construction Work





9 weeks lag

Work commences


Engineering’s Bill of Material

Forecasting to meet scheduled IFC Contractor resource mobilized

1 2

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Constrained Path of Construction





9 weeks lag

Work commences


Contractor resource mobilized 2

Vendor Data needed to complete EW delivered late or incomplete

Lag gets squeezed CWP starts late

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Work commences

Purchase Order to supplier

Contractor resource mobilized 2

How do we improve this interface?

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Engineering Work Package (EWP) Construction Work Package (CWP)

Work commences Delay in Engineering will cause lag gets squeezed CWP

starts late

Model Review causes late changes

MTO can’t be created

No IFC or AFC status for P&IDs

Specification is not complete

Client or EPC take longer time for document review and caused delay

How are these mitigated / eliminated?

It is important to knows the work sequence in order

to plan for Construction Work Package.

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Engineering Work Package Progress

Ex : Piping Work Package.

2 P&IDs

3 Requisitions

4 Specifications.

1 3D modelling development

5 Pipe Stress analysis

6 Calculations

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Forecasting Scenario

Ex : Piping Work Package.

Next Weekly Forecast - EWP slips one week

EWP is forecast to meet scheduled IFC

Next Weekly Forecast - EWP slips another week

Contractor plans resource mobilization

Contractor tries to mitigate

Delay in Construction work and recovery needed

Delay in Engineering Work Package approval in return cause

delay in construction work.

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Potential Work Flow and Rule of Credit for Piping

Step Work Flow Increment % Cumulative %

1 EWP ID’d and mapped to CWP 5% 5%

2 Initial scope identified (line numbers) 15% 20%

3 Preliminary equipment data received 5% 25%

4 Initial routing of lines established 20% 45%

5 Initial bulk material (BOM) to supply chain 10% 55%

6 Piping studies rec’d for critical lines: 5% 60%

7 Final vendor data received 10% 70%

8 Final routings completed 5% 75%

9 P&IDs and LDT issued IFC 5% 80%

10 Stress analysis for large bore completed 5% 85%

11 BOM completed 5% 90%

12 EWP c/w all drawings/specs issued IFC 5% 95%

13 EWP accepted by Construction AFC 5% 100%

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What Makes Forecasting is a Challenge

Challenges

EWP process has many steps to get to IFC

The rules of credit (if they exist) are either not known or not utilized.

EWP development held back by outside influence (e.g., Systems, Vendor Data or Owner Decisions)

Construction mobilizes resources based on forecast completions of EWP IFC

Engineering forced to release partial EWPs or releases EWPs out of sequence or EWPs with HOLDS

EWP releases continue to slip but construction is now mobilized

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Engineering Work Package and Construction Work Package

CWP

Scope of Work

IFC drwgs Eng.Specs&Stds Equipment/Materials

Vendor info Quality Instructions

Regulatory approvals/permits

Turnover Documents Schedule (Level 5)

Engineering

Long Leads RAS dates

Material Mgmt Expediting Transportation Special

Requirements

Procurement

HSE/Safety Manpower req. Level 4 Schedule

QA/QC Construction Tools/Equip

Heavy Lift Plans Scaffold

Waste Mgmt Interfaces/Coordination

Construction

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Sample WBS

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WBS Structure

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WBS Structure

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Sample WBS for Electrical Construction

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Sample Pipeline Construction Project WBS for Refinery/Chemical Plant

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Sample Pipeline Construction Project WBS for Refinery/Chemical Plant

Sample WBS for piping construction project for a refinery or chemical plant may be organized as the following. It is worth to be organized by location wise (i.e. platform and pipe rack, platform and equipment around piping) prior to “Phase” WBS. Timely completion of piping construction is not only depending on timely receiving of engineering drawings and materials from Owner/EPC contractor but timely availability of the infrastructure should also be addressed. Sometime it refers to work front availability. Developing WBS is mainly depending on the project scope. It should be defined according to the project specific as every project is different, for instance, “Demolishing” WBS may also be added under “Phase” level priority to “Installation” WBS if your project scope involved a considerable amount of piping demolishing scope. “Above Ground” and “Under Ground” WBS can be left in case no underground piping work is included in the project. (1) Level 1: Plant Unit, e.g. Utility Unit, Ethylene Theatre Unit, etc. (2) Level 2: Area within a Unit, for instance, Area ABC, Area XYZ. Area demarcation is marked for a group of process piping on above ground and underground. (3) Level 3: Height. This is to segregate pipe work on the above ground and underground. (4) Level 4: Location where pipeline is run, for instance, piping on and around pipe rack, equipment and equipment platform. (5) Level 5: Phase, e.g. Fabrication, Installation (field erection, NDT) and pre-commissioning (hydro testing, air flushing, chemical cleaning etc.) Note : “Common” WBS name refers to common location where interconnecting piping is running between the pipe rack and equipment or equipment platform. Having a clear definition of what is and what is not meant by “Common” is important

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Sample Fuel Tank WBS

External Floating Roof Tank 0

Foundation work 1.0

Field erection works 2.0

Tank Bottom 2.1

Shell side 2.2

Roof works 2.3

Tank accessories installation

2.4

Fire fighting works

2.5

Bottom plates installation

2.1.1

Final coating 2.1.2

Shell plates installation

2.2.1

Nozzles and man ways installation

2.2.2

Final Coating 2.2.3

Center deck plate installation

2.3.1

Drainage piping 2.3.2

Final Coating 2.3.3

Internal Appurtenances

2.4.1

External accessories

2.4.2

Foam piping installation

2.5.1

Final coating 2.5.2

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Sample Fuel Tank WBS

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Piping Discipline

( Piping Fabrication, Tie-in and Commissioning )

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Piping Tie-in Process

Normally, piping tie-in installation scope is involved in revamp project only. The progress tracking system for tie-in work includes Tie-in Tracker Sheet and Progress tracking sheet. Tie-in numbers against the Isometric drawings and work packages are listed in the tracker sheet. The tie-in type (Bolt-up, cut and weld, hot tap, cold tap and threaded are typical tie-in types in process industry), project area or system name and installed dates are also included in the tracker sheet. To develop Progress Tracking Sheet for overall Isometric drawings, the following work steps and weight factor percentages are utilized. 1. Preparation ( Scaffold erection if required/remove insulation if required) -20% 2. Tie-in work (Bolt up/cut & weld/hot tap/cold tap/threaded) -70% 3. Inspection (Sign QC document, example : flange make up check list) -10% The Progress Tracking System for Pipeline Erection Work Developing procedure of progress tracking system for pipeline erection work is the same as piping fabrication work except work steps and weight factor percentages. To do that, replace the following work steps and weight factor percentages with the existing ones and rearrange the formulae. 1. Material at Erection area - 5% 2. Piping Laying -20% 3. Preparation(align/tack weld) -20% 4. Full Welding Execution - 40% 5. Non Destructive Examination - 5% 6. Pipe Support Erection -15% 7. Final Inspection - 5%

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Commissioning Test package and Tie-In

System Commisionning

Piping Fabrication

Piping Tie-In

Piping Test Package

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Piping Tie-in Work Sequence

General piping tie-in work flow and how rule of credit being assigned to each step.

Weld map drawing

preparation

Withdrew material

Welding preparation

Spool assemble and

tack weld Welding NDT

Surface preparation and coating

Final inspection

Delivery at site

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Piping Hydrotest Work Sequence

Preparation Done Testing Reinstated Clear Punch list

General hydrotest work flow and how rule of credit being assigned to each step.

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Commissioning Test package and Tie-In

Test Package for Pre- Commissioning Tie-In List

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Piping Tie-In

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Special Pipe Support Drawing

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Piping Pre-Fab Drawing

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Piping ISO Drawing

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Vessel Fabrication

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Vessel Fabrication Work Flow

Exchanger Vessel Fit Up (Pre-Fabrication)

Exchanger Vessel Weld Out

(Assembly)

Tubesheet Fit Up / Weld Out

Testing (NDE, Hydro

Painting Ex-work

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Vessel Fabrication Work Flow

Shell Side Fabrication · Plate marking /cutting/ beveling and inspection · Shell plate rolling work · Longitudinal steel (LS) fit-up and inspection · LS welding and inspection (NDE) · Circumference steel (CS) fit-up and inspection · CS welding and inspection (NDE) Inlet and outlet nozzles fabrication · Pipe marking/cutting / beveling and inspection · Fit-up and welding of flanges and pipes · Inspection for nozzles to flange joints (NDE) Nozzle Attachments to Dished Head · Marking of nozzle location on dished head · Cutting/opening/ beveling and inspection · Fit-up and tack weld nozzle to dished head · Inspection for tack welding (if required) · Full weld - nozzle assembly with dished head · Inspection for nozzle to dished head welds (NDE) Nozzles and other accessories to Shell · Marking of nozzles location · Cutting/opening/ beveling and Inspection · Fit-up and tack weld nozzle assembly to shell/inspection · Full weld - nozzle assembly with shell · Inspection for nozzle to shell side welds (NDE) · Fit up and welding for instrument attachments · Fit up and welding for lifting lugs

Dished head Installation · Fit up and tack weld/Inspection – Dished head to shell · Full circumference welding · Inspection for full welds (NDE) Inspection (Hydro-testing) · Hydrostatic testing · Draining/drying and final inspection Blasting and Painting · Blasting/Inspection · Primer/Final coating/Inspection

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Vessel Fabrication Case Study

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Vessel Fabrication Process

87


Plate Cutting

88


Plate Rolling

89


Longitudinal Seam Welding

90


Longitudinal Seam Welding

91


Can to Can Fit-up

92


Can to Can Fit-up

93


Can to Can Fit-up

94


Tack Weld

95


Weld Inside Circumference of Can

96


Weld Outside Circumference of Can

97


Weld Outside Circumference of Can

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NDT

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The End

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