Claim Case Study - Concordia Universityusers.encs.concordia.ca/home/h/h_abaeia/Project... · Web...
Transcript of Claim Case Study - Concordia Universityusers.encs.concordia.ca/home/h/h_abaeia/Project... · Web...
Claim Case Study
Submitted By:
Hossein Abaeian 7119852
Waad Alghazi 6697658
INTRODUCTION
The project includes the erection of mechanical equipment and installs piping included in
the SAG MILL MECHANICAL contract. The history of the project is summarized as the
following:
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Summary of Contract:
Name of the contract: SAG MILL MECHANICAL contract
Project start date: 30 April, 1990
Actual Project start date: 3 May, 1990
Project planned finishing date: 31 August, 1990
Actual Project finishing date: 14 December, 1990
Type of the contract: Lump Sum
Total amount of contract: $2,549,130
On January 31st 1990, owner invites the contractor for bidders list for SAG mill
mechanical contract. Contractor qualifies for the project at the plant. Proposal request for
SAG mill mechanical contract was issued by the owner on the 19th of March 1990.
Contractor submitted the proposal on the 17th of April 1990. Between 17th of April 1990
and May 3rd, 1990 owner and contractor exchanged correspondence relative to the
proposal and participated in bid clarification meeting. On May 3rd 1990 the owner granted
the contractor the SAG mill mechanical contract for $2,549,130. The contract duration
time March 1990 to August 1990 (20 weeks). Upon the award of the contract the
contractor mobilized its forces to the project site immediately. However the contractor
was prevented to execute the work as settled with the contract. The claim is conducted
because of several reasons. One the contractor was not able to access the work areas as
planned date. Second, late delivery of equipment and some of the equipment were
delivered damaged or with deficiencies. Third, construction drawings, vendor drawings
and revisions of drawings were submitted late. These changes were imposed upon
Contractor without the prior issue of a Change Order. These problems impacted the time,
productivity and cost of construction. The engineer advised the contractor to complete the
contract without deficiencies by 13th of December 1990. Refer to the history and key
communication summary between the owner/engineer and contractor.
Picture bellow shows the work breakdown structure of the project:
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SCOPE ANALYSIS :
The mechanical equipment erection work in the contract was divided into six main physical areas of the site excluding the piping. The piping work was spread out over all
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the areas and is considered as the 7th area. The six areas with the relative volume of labour content are described briefly.
CHANGES TO THE CONTRACT :
The changes made to the contract are divided into 5 main categories as described below:
1. Changes in information regarding delivery of equipment (shell delivery changed
from June to July, then to the end of August), changes of equipment delivery
dates varied between one and six months later than the specified delivery dates
(most of which the contractor was not notified of)
2. Changes of the erection work caused by change in delivery of equipment
3. Changes in access for unloading equipment and erection work due to late
completion of work to be performed by owner’s forces or other contractors
4. Changes to the methods specified (to ease the effects of lack of access and late
deliveries and to correct defects on equipment supplied by owner)
5. Changes in the scope of work to be performed (including changes and revisions in
the designs done after the contract was awarded and correctional work)
MAN-HOUR :
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In the case of actual man-hours spent on site, they have been divided to two main
sections:
1. Man-hours spent on the works assigned in the original contract
2. Man-hours spent on the extra work added to the original contract afterwards The two
man-hour sections are further divided into three subsections that include the premium
hours, regular hours and shift differential hours. In order to calculate the total man-hour
value of the project, the labour cost was assumed to be $40/hour for the regular hours and
$50/hour for the shift differential and extra-work hours.By subtracting the amount of
earned man-hours in the billing file from the amount of actual man-hours, the claim
balance for the man-hour section is found.
CHANGE ORDERS :
The original contract was signed based on the given drawings at the time, and the
contract price that was used for bidding was found through studying the drawings and
determining the required scope for the project. Afterwards, some changes to the project
schedule were made due to changes in the scope of the work and the occurrence of
several delays. These changes caused major loss in productivity, which needs to be added
to the claim. Based on the communication between the owner/engineer and the contractor
some of the drawings had to be redrawn or revised, adding more value to the claim
requested. Also, several change orders were issued due to delays and changes made,
which had been calculated and provided to the engineer. The total loss in productivity
due to the points mentioned above is estimated based on the Charles Leonard method by
using the Charles Leonard charts. To find the effect of changes on the productivity, the
costs of change orders and reissuing of drawings were added and divided by the contract
price. From the charts, using the line with two major causes for drawings and change
orders, the amount due to loss in productivity is determined.
Area # 0 – General
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Unpaid Man-hours:
Item # Item Description Detail Estimated Man-hours
Earned Man-hours
Unpaid Man-hours
1 Mobilization Mobilization -LABOUR
80 80 0
72 Demobilization Demobilization - LABOUR
40 40 0
Total Unpaid Man-hours 0
Extra Man-hours:
Item # Item Description Regular Man-hours Premium Man-hours1 Mobilization 1,211 84.75
72 Demobilization 0 0TOTAL 1,211 84.75
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Delay Analysis:
As-Planned Dates
Item # Item Description
Detail Planned Start Date
Planned Finish Date
1 Mobilization Mobilization – LABOUR
30 APR 1990 04 MAY 1990
72 Demobilization Demobilization - LABOUR
31 DEC 1990 31 AUG 1990
As-Built Dates
Item # Item Description
Detail Actual Start Date
Actual Finish Date
1 Mobilization Mobilization – LABOUR
07 MAY 1990 16 MAY 1990
72 Demobilization Demobilization - LABOUR
14 DEC 1990 14 DEC 1990
As-Planned vs As-Built Schedule (Area_0)
Delay: 3.50 M
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Change Orders:
Number of Change orders: 19 Total Number of Orders: 62
Area # 1 – Crusher Building
This area includes an existing building housing the storage bin for the CLARABELLE MILL that receives the ore directly from the mine. By means of apron feeders the ore is extracted from the base of the bin which is fed to the conveyors. The conveyors then transport the ore to a series of cone crushers in the building, where it is reduced in size and is then fed elsewhere in the mill for further processing. There are 6 apron feeders at the base of the bin; where each apron feeder feeds its own conveyor belt. The purpose of the work in this area is to redirect some of the ore of this bin to the new SAG mill using only 2 of the apron feeders. This is done by taking 2 apron feeders out of service, removing the conveyor and installing new ones and hence modifying the apron feeders to ensemble the direction and capacity of the new conveyors.
Scope Of Work:
1. Remove the existing belt conveyors 1 and 2 (which take the ore from
apron feeder1)
2. Remove the existing belt conveyor 9 (which takes the ore from apron
feeder 6)
3. Remove the existing drive (gear box and couplings), motor and base plate
for apron feeders 1 and 6
4. Break out the existing concrete bases for the drive, motor and base plate
for apron feeders 1 and 6
5. Form and pour new concrete bases for the drives and motors for apron
feeders 1 and 6
6. Install, align and couple the new drives and motors
7. Modify existing chute work for apron feeders 1 and 6.
Unpaid Man-hours:
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Item # Item Description
Detail Estimated Man-hours
Earned Man-hours
Unpaid Man-hours
2Remove existing
conveyors
Remove existing
conveyor847 847 0
11
Modify existing
feeders plate work &
concrete pads
Pour crusher pads
112 112 0
Modify existing feeders
343 326 17
Modify existing plate work
87 83 4
Total Unpaid Man-hours 21
Extra Man-hours:
Item # Item Description Regular Man-hours
Premium Man-hours
2 Remove existing conveyors 0 011 Modify existing feeders plate work &
concrete pads296 97.50
Total 296 97.50
Late Equipment Delivery Dates:
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Item # Item Description
Equipment # Contract Date
Actual Delivery Date
Delay Time
2Remove existing
conveyors
N/A N/A N/A N/A
11Modify existing feeders plate
work & concrete pads
24-FDR-001 15 JUN 1990 18 SEP 1990 3M +3DAYS
24-FDR-006 15 JUN 1990 18 SEP 1990 3M +3DAYS
Delay Analysis:
As-Planned Dates
Item # Item Description
Detail Planned Start Date
Planned Finish Date
2 Remove existing
conveyors
Remove existing conveyor
09 JUL 1990 31 JUL 1990
11Modify existing feeders plate
work & concrete pads
Modify existing feeders
30 JUL 1990 13 AUG 1990
Modify existing plate work
09 JUL 1990 20 JUL 1990
As-Built Dates
Item # Item Description
Detail Actual Start Date Actual Finish Date
2 Remove existing conveyors
Remove existing conveyor
04 SEP 199005 NOV 190
28 SEP 199030 NOV 1990
11 Modify existing feeders plate
work & concrete pads
Modify existing feeders
10 SEP 199007 NOV 1990
28 SEP 199030 NOV 1990
Modify existing plate work
10 SEP 1990 30 NOV 1990
As-Planned vs As-Built Schedule (Area_1)
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Delay: 3.71
Changes and causes & Effects Relationship:
Cause Effect Relationship
Late delivery of equipment (chute, motors, drives)
Modification of feeders is
delayed
Feeders cannot be modified without
the equipment
Requirement to salvage conveyors
Removal of the existing
conveyor is delayed
Conveyors salvaged instead of scrapped
Access problems to conveyors
Late access to work area Lack of access during extra work on
feeder #6 by others
Extra work due to modifications
Delay to feeder #1 pending structural steel work by
others
Extra work on structural steel supports
to feeder #6 & #1
Impact Analysis: (Refer to Daily Site Report)
Late Delivery of Equipment: Row code number: 197Requirement to Salvage Conveyors: Row code number: 192 to 196, 198 to 201
Access Problem to Conveyors: Row code number: 190 to 191
Extra Work due to Modifications: Row code number: 192 to 196, 198 t0 201
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Change Orders:
Number of Change orders: 12 Total Number of Orders: 90
Area # 2 – Conveyors
The new SAG mill is housed in the mill building. The ore is transported from the
Crusher Building to the mill building through the Coarse Ore Silo. Ore transportation
is done by 2 exterior conveyors: the ore silo feed conveyor and the SAG mill feed
conveyor.
First is the ore silo feed conveyor that has a total length of 560 feet. This conveyor
starts at the upper level of the crusher building. About 124 feet long of the conveyor
section is included in the crusher building. At around 41 feet above the ground, the
conveyor leaves the building with length of approximately 436 feet. Then continues
upwards to an elevation of about 118 feet above ground elevation where it ties in at
the top of a second ore storage bin. This second bin is referred to as the "Coarse Ore
Silo".
The second conveyor, the SAG mill feed conveyor, originates at the base of the
Coarse ore silo (85 feet) and continues into the new mill building (45 feet) where it
discharges into the SAG mill. About 95 feet of this conveyor is outside and is fully
enclosed in a steel structure.
Scope Of Work:
1. Off-load the conveyors, drives and accessories from railcars at the
designated rail delivery point about 6 miles from the site;
2. Transport to site;
3. Assemble the bents;
4. Erect the bents;
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5. Erect the conveyor galleries;
6. Complete assembly of conveyors;
7. Install drives, motors and chutes;
8. Install conveyor belts.
Unpaid Man-hours:
Item #
Item Description
Detail Estimated Man-hours
Earned Man-hours
Unpaid Man-hours
7 & 20
Install ore silo feed conveyor / Install conveyor
belting
Install ore silo feed conveyor & associated equipment
1,615 1,534 81
18Install pebble
conveyor – sagInstall pebble conveyor –
sag503 503 0
19 Install sag mill feed conveyor
Install sag mill feed conveyor
935 935 0
Total Unpaid Man-hours 81
Extra Man-hours:
Item # Item Description Regular Man-hours
Premium Man-hours
7 Install ore silo feed conveyor 1167 262.518 Install pebble conveyor – sag 132 1319 Install sag mill feed conveyor 259 3920 Install conveyor belting 0 0
Total 1558 314.5
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Late Equipment Delivery Dates:
Item # Item Description
Equipment # Contract Date Actual Delivery Date
Delay Time
7Install ore silo feed conveyor
24-BC-101 1 MAY 1990 24 AUG 1990 115 Days
24-BC-101BLT 1 JUL 1990 22 AUG 1990 52 Days
24-BC-101M 28 MAY 1990 17 JUL 1990 50 Days
18
Install pebble conveyor –
sag
33-BC-102 1 JUN 1990 18 OCT 1990 139 Days
33-BC-102BLT 1 JUL 1990 22 AUG 1990 52 Days
33-BC-102M 15 JUN 1990 17 JUL 1990 32 Days
33-CH-109 15 MAY 1990 10 JUL 1990 56 Days
19
Install sag mill feed conveyor
33-BC-101 1 MAY 1990 8 NOV 1990 191 Days
33-BC-101M 30 JUN 1990 17 JUL 1990 17 Days
33-CH-105 1 MAY 1990 10 JUL 1990 70 Days
800-BC-101BLT 1 JUL 1990 24 JUL 1990 23 Days
20 Install conveyor belting
33-BC-101BLT 1 JUL 1990 22 AUG 1990 1 M + 23 Days
Delay Analysis:
As-Planned Dates
Item # Item Description Detail Planned Start Date Planned Finish Date7 Install ore silo
feed conveyorLine 1 to 5Line 2 to 25
7 MAY 199023 JUL 1990
01 JUN 199010 AUG 1990
18 Install pebble conveyor – sag
Install pebble conveyor –
sag
25 JUN 1990 20 JUL 1990
19 Install sag mill feed conveyor
Install sag mill feed
30 APR 1990 20 JUN 1990
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conveyor
As-Built Dates
Item # Item Description Detail Actual Start Date Actual Finish Date
7Install ore silo feed
conveyorLine 1 to 5
Line 2 to 2516 MAY 199020 JUN 1990
18 JUN 199020 JUL 1990
18 Install pebble conveyor – sag
Install pebble conveyor – sag
08 AUG 1990 28 AUG 1990
19Install sag mill feed
conveyorInstall sag mill feed conveyor 30 MAY 1990 10 OCT1990
As Planned vs As Built Schedule (Area_2)
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Delay: 1.37 M
Changes and Causes & Effects Relationship:
Cause Effect Relationship
Crusher Building – Access Problem
Ore Silo Feeder’s Installation
Is Delayed
Lack Of Access During Work By
Others On Feeder #6
Late Delivery Of Equipment
Ore Silo Feeder’s Installation
Is Delayed
Late Supply Of And Deficiencies
In Head Section & In Conveyor
Gear Box
Extra Work On Galleries
Ore Silo Feeder & Sag Feed
Conveyor’s Installation Is
Delayed
Cribbing And Re-Cribbing Of
Conveyor Galleries & Faulty
Welds In Conveyor Galleries
Extra Work On Foundation
Ore Silo Feeder’s Installation
Is Delayed
Conveyor Bent Foundations Off
Line & Modifications To Bents To
Suit Foundations
Impact Analysis: (Refer to Daily Site Report)
Crusher Building- access problem: Row code number: 447,452, 459, 477
Late Delivery of Equipment: Row code number: 439, 446
Extra Work on Galleries: Row code number: 440 to 445, 453 to 489, 461 to 464, 466 to 476, 478 to 494, 499 to 507, 509 to 517
Extra Work on Foundation: Row code number: 465, 495, 508
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Change Orders:
Number of Change orders: 79 Total Number of Orders: 316
Area # 3 – Coarse Ore Silo
The point of the Coarse Ore Silo is to supply a flow capacity between the SAG mill
and the existing crusher building. The Coarse Ore Silo is a cylinder made of concrete
having a diameter of 64 feet and a height of 118 feet. The interior surface of the silo
is lined with steel rail track. On top of the silo is a structural steel penthouse with
about 38 feet long by 22 feet wide and 18 feet in height. The ore enters via the Coarse
Ore Silo feed conveyor at the top of the silo inside the penthouse structure and is
discharged into the silo. The ore falls through a series of chutes; in the lower part of
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the silo; then passes onto one of the 2 apron feeders. At the base of the Coarse Ore
Silo the feeders release the ore onto the SAG mill.
Scope Of Work:
1. Erect the penthouse steel, roofing and siding;
2. Install the apron feeders including drives and associated plate work, and
3. Erect the silo crane hoist in the penthouse.
Unpaid Man-hours:
Item # Item Description
Detail Estimated Man-hours
Earned Man-hours
Unpaid Man-hours
4 Penthouse steel erection
Erect penthouse steel
663 663 0
5Install plate
work feeders & motors
Install ore silo feeders
775 775 0
Install plate work ore
519 519 0
12 Erect silo Install sag mill 87 87 0
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crane hoists feed conveyor15 Install pumps
– ore storageInstall conveyor
belting24 24 0
Total Unpaid Man-hours 0
Extra Man-hours:
Item # Item Description Regular Man-hours Premium Man-hours
4 Penthouse steel erection 24 19
5 Install plate work feeders & motors 218 1412 Erect silo crane hoists 16 015 Install pumps – ore storage 0 0
Total 258 33
Late Equipment Delivery Dates:
Item # Item Description Equipment # Contract Date Actual Delivery Date
Delay Time
4 Penthouse Steel Erection
N/A N/A N/A N/A
5
Install Plate work Feeders & Motors
33-Ch-101 5 Jun 1990 20 Aug 1990 2M +16 Days
33-Ch-102 5 Jun 1990 20 Aug 1990 2M +16 Days
33-Ch-103 5 Jun 1990 26 Jul 1990 2M +16 Days
33-Ch-104 5 Jun 1990 26 Jul 1990 2M +16 Days
33-Fdr-101 20 Apr 1990 15 Jun 1990 1 M +25 days
33-Fdr-102 20 Apr 1990 15 Jun 1990 1 M +25 days
12 24-Cn-101 20 May 1990 3 Aug 1990 2M +14 DAYS
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Erect Silo Crane Hoists
24-Cn-101m 20 Jun 1990 9 Aug 1990 1M +20 Days
24-Cn-101m1 20 Jun 1990 9 Aug 1990 1M +20 Days
24-Cn-101m2 20 Jun 1990 9 Aug 1990 1M +20 Days
24-Cn-104 30 Jun 1990 3 Aug 1990 34 Days
33-Cn-102 30 Jun 1990 3 Aug 1990 34 Days
33-Cn-102m1 20 Jun 1990 9 Aug 1990 1M +20 Days
33-Cn-102m2 20 Jun 1990 9 Aug 1990 1M +20 Days
15 Install Pumps – Ore Storage
33-P-112 30 Jun 1990 11 Jul 1990 11 Days
Delay Analysis:
As-Planned Dates
Item # Item Description Detail Planned Start Date
Planned Finish Date
4 Penthouse steel erection
Erect penthouse steel 07 MAY 1990 01 JUN 1990
5Install plate work feeders & motors
Install ore silo feeders 30 APR 199030 MAY 199002 JUL 1990
23 MAY 1990 04 JUL 1990 04 JUL 1990
Install plate work- ore storage
Install pump ore storage
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15 Install pumps – ore storage
Install conveyor belting 23 JUL 1990 27 JUL 1990
As-Built Dates
Item # Item Description Detail Actual Start Date
Actual Finish Date
4 Penthouse steel erection
Erect penthouse steel 04 JUL 1990 15 AUG 1990
5 Install plate work feeders & motors
Install ore silo feeders 13 JUN 199004 SEP 1990
20 JUN 1990 14 SEP 1990Install plate work- ore
storageInstall pump ore
storage
15 Install pumps – ore storage
Install conveyor belting
04 SEP 1990 14 SEP 1990
As-Planned vs As-Built Schedule (Area_3)
Delay: 2.80 M
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Causes & Effects Relationship:
Cause Effect Relationship
Penthouse Steel – Access Problems
Erection Of Penthouse Steel Is
Delayed
Late Delivery Of Penthouse Steel,
Pouring Of Concrete Bin, Supply Of
Steel Decks
Feeders – Access Problems
Feeders & Motors Installation
Are Delayed
Late Delivery Of Liners & Motors
Late Delivery Of Silo Crane Hoists
Erection Of Crane Hoist Is
Delayed
Late Delivery Of Crane Host &
Modifications To Crane Trolley
Impact Analysis: (Refer to Daily Site Report)
Penthouse Steel- Access Problems: Row code number: 606 to 607
Feeders – Access Problems: Row code number: 608 to 621
Late Delivery of Soil Crane Hoists: Row code number: 622
Change Orders:
Number of Change orders: 19 Total Number of Orders: 105
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Area # 4 – Sag MillThis area includes the largest item of work, the installation of the SAG mill. The SAG
mill consists of a center shell and 2 heads, one at each end: the feed head and the
discharge head. The shell and the 2 heads consist of three sections. At the centre of the
head section a trunnion is bolted. The trunnion supports the mill and the mill rotates on
the trunnion. The trunnion rests on pedestals.Coarse ore from the Coarse Ore Silo is fed
into the SAG mill via the SAG feed conveyor. The SAG mill rotates and breaks this
coarse ore down into smaller pieces.
Scope Of Work:
1. Install the 32 foot diameter SAG mill including sole plates, turn-on bearings,
head and shell sections, discharge trammel, drive gear and pinions, pinion
shaft bearings and sole plates and plate work;
2. Align the SAG mill as per the manufacturer's requirements;
3. Sandblast the SAG mill shell interior and install rubber lining;
4. Install the SAG mill lube system;
5. Install SAG mill lining, grates, lifters and turn-on liners;
6. Install and commission liner handling machine and mill jacking cradles;
7. Install SAG mill main driver motors, cooling fans with drives, motors and
cooling coils, and
8. Supply and install connecting ducts between cooling fans and mill motors.
Unpaid Man-hours:
Item # Item Description
Detail Estimated Man-hours
Earned Man-hours
Unpaid Man-hours
30 Sag mill Receive/assemble 3,445 2,756 689
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installation sag millErect liner handler 48 48 0
Total Unpaid Man-hours 689
Extra Man-hours:
Item # Item Description Regular Man-hours Premium Man-hours
30 Sag mill installation 2,554.5 927.5
Total 2,554.5 927.5
Late Equipment Delivery Dates:
Item # Item Description
Equipment # Contract Date Actual Delivery Date
Delay Time
30
Sag Mill Installation
33-CC-101 15 JUN 1990 15 AUG 1990 61 Days33-CN-101 15 MAR 1990 20 MAY 1990 66 Days33-CH-106 15 MAY 1990 13 JUN 1990 29 Days33-SM-101 31 MAY 1990 11 DEC 1990 194 Days
33-SM-101MA 30 MAY 1990 12 NOV 1990 5M +13 days33-SM-101MB 15 JUN 1990 12 NOV 1990 150 Days33-SM-101C 30 MAR 1990 13 JUN 1990 75 Days33-TS-101 30 APR 1990 13 JUN 1990 44 Days
Discharge Head Section D, E, F
31 MAY 1990 31 AUG 1990 1M +14 days
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Delay Analysis:
As-Planned Dates
Item # Item Description
Detail Planned Start Date
Planned Finish Date
30 Sag mill installation
Install Sole plates 30 APR 1990 18 MAY 1990Assemble
Components09 MAY 1990 08 MAY 1990
Install Ring Gear 30 MAY 1990 15 JUN 1990Install Motors 11JUN 1990 26 JUN 1990Install Pinions 18 JUN 1990 22 JUN 1990Install Liner
Handler18 JUN 1990 22 JUN 1990
Erect Mill Crane Hoist
20 JUN 1990 27 JUN 1990
Install Clutch 27 JUN 1990 4 JULY 1990Install Guards 02 JUL 1990 13 JULY 1990Install Liners 11 JUL 1990 14 AUG 1990
Install Trommel 06 AUG 1990 15 AUG 1990Commission 20 AUG 1990 31 AUG 1990
As-Built Dates
Item # Item Description
Detail Actual Start Date Actual Finish Date
30 Sag mill installation
Install Sole plates 30 MAY1990 15 JUN 1990Assemble
Components20 JUN 1990 27 JULY 1990
Install Ring Gear 08 OCT 1990 17 OCT 1990Install Motors 04 SEP 1990 21 SEP 1990Install Pinions 08 OCT1990 24 OCT 1990Install Liner
Handler26 SEP 1990 05 OCT 1990
Erect Mill Crane Hoist
01 DEC 1990 11 DEC 1990
Install Clutch 15 NOV 1990 09 NOV 1990Install Guards 10 SEP 1990 14 SEP 1990Install Liners 17 OCT 1990 21 NOV 1990
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Install Trommel 07 NOV 1990 16 NOV 1990Commission 21 NOV 1990 28 NOV 1990
As Planned vs As Built Schedule (Area_4)
Delay: 3.00M
Causes & Effects Relationship:
Cause Effect Relationship
Sole Plates Cannot Be Installed
Sole Plate Installation Is
Delayed
Foundation Work For Sole Plate Is
Incomplete
Late Delivery Of Discharge Head Sections
Sag Mill Assembly Is
Delayed
Discharge Head Sections Are Needed
For Mill Assembly
Overcasting Of Discharge Head Sections
Sag Mill Assembly Is
Delayed
Treatment Of Overcasting Needs Extra
Time
Discharge Trunnion Misalignment
Sag Mill Assembly Is
Delayed
Treatment Of Misalignment Needs Extra
Time
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Bull Gear – Extra Alignment/Conflict In Installation Method
Sag Mill Assembly Is
Delayed
Change In Design & In Method Of
Construction Needs Extra Time
Late Delivery Of Motors Sag Mill Assembly Is
Delayed
Motors Are Needed For Completing The
Work
Impact Analysis: (Refer to Daily Site Report)
Problem #1: Sole Plates
Problem #2: Late delivery of discharge head sections
Problem #3: Overcasting of discharge head sections
Problem #4: Discharge trunnion misalignment
Problem #5: Bull gear- extra alignment/conflict in installation method
Problem #6: Late delivery of motors
Change Orders:
Number of Change orders: 146 Total Number of Orders: 557
Area # 5 – Sag Mill – Other
This area includes components other than the SAG mill itself that are related to the
operation of the SAG mill.
Scope Of Work:
1. Install plate work;
2. Install magnets;
3. Install cone crusher and lube system;
4. Install pumps
5. Install vibrating screens.
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Unpaid Man-hours:
Item # Item Description Detail Estimated Man-hours
Earned Man-hours
Unpaid Man-hours
17 Install plate work –sag
Install plate work –sag
1,151 1,151 0
Erect crane hoist sag
40 40 0
24 & 49
Install lube system & cone crusher
Receive/assemble crusher/lube
system
958 958 0
28 Install magnets/associated
Install magnets/associate
d
271 81 190
43 Install pump – sag Install pump – sag 487 487 044 Install vibrating
screensReceive/assemble vibrating screens
335 335 0
Total Unpaid Man-hours 190
Extra Man-hours:
Item # Item Description Regular Man-hours Premium Man-hours17 Install plate work –sag 502 44
24 & 49 Install lube system & cone crusher 515.50 7128 Install magnets/associated 32 243 Install pump – sag 30 444 Install vibrating screens 166 14
Total 1,245.5 135
Late Equipment Delivery Dates:
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Item #
Item Description Equipment # Contract Date Actual Delivery Date
Delay Time
17 Install plate work –sag
33-CH-107 30 MAY 1990 27 JUN 1990 27 days33-CH-108 30 MAY 1990 6 JUL 1990 1M + 7 days33-CH-110 15 JUN 1990 01 AUG 1990 1M + 15 Days33-CH-113 15 JUN 1990 22 JUN 1990 7 Days
33-CH-117? 30 MAY 1990 27 JUN 1990 33 Days33-CH-123? 30 MAY 1990 22 JUN 1990 28 days33-DI-101 20 JUN 1990 08 AUG 1990 1M + 18 Days33-DI-103 20 JUN 1990 12 JUL 1990 22 Days33-DI-105 20 JUN 1990 27 JUN 1990 7 days33-LR-106 30 JUN 1990 26 JUL 1990 25Days33-LR-110 30 APR 1990 09 JUL 1990 2M + 16 days33-PB-101 15 MAY 1990 09 JUL 1990 1M + 24 days
24 & 49
Install lube system & cone crusher
33-LU-101 01 APR 1990 14 SEP 1990 5 M +13 days33-LU-102 01 APR 1990 13 JUN 1990 2M + 11 days33-LU-103 15 MAR 1990 12 JUN 1990 2 M +27 days33-LU-104 15 APR 1990 15 JUN 1990 2 M +27 days
28 Install magnets/associated
33-CH-115 30 MAY 1990 31 JUL 1990 2M + 1 day33-CH-116 30 MAY 1990 31 JUL 1990 2M + 1 day
43Install pump – sag
33-P-101 31 MAY 1990 24 AUG 1990 2 M+ 23 days33-P-102 31 MAY 1990 24 AUG 1990 2 M+ 23 days33-P-103 31 MAY 1990 24 OCT 1990 2 M + 23 days33-P-104 31 MAY 1990 24 OCT 1990 2 M+ 23 days33-P-105 30 JUN 1990 11 JUL 1990 11 days33-P-106 30 JUN 1990 11 JUL 1990 11 days33-P-107 30 JUN 1990 12 OCT 1990 3M+ 13 days33-P-108 30 JUN 1990 12 OCT 1990 3M+ 13 days33-P-109 31 MAY 1990 24 AUG 1990 2 M + 23 days33-P-110 31 MAY 1990 24 AUG 1990 2 M + 23 days33-P-111 30 JUN 1990 11 JUL 1990 11 days
44 Install vibrating screens
33-CH-114 30 MAY 1990 09 AUG 1990 2M + 10 days33-CH-125 30 MAY 1990 09 AUG 1990 2M + 10 days
33-LU-104-H 15 APR 1990 15 JUN 1990 2M33-LU-104-H2 15 APR 1990 15 JUN 1990 2M
33-LU-105 15 APR 1990 15 JUN 1990 2M33-LU-105-H 15 APR 1990 15 JUN 1990 2M
33-LU-105-H2 15 APR 1990 15 JUN 1990 2M33-VS-101 30 APR 1990 15 JUN 1990 1M+ 16 days33-VS-102 30 APR 1990 15 JUN 1990 1M + 16 days
Delay Analysis:
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As-Planned Dates
Item #
Item Description
Detail Planned Start Date
Planned Finish Date
17 Install plate work –sag
Erect crane hoist sag Install plate work –sag
20 JUN 199011 JUL 1990
27 JUN 199008 AUG 1990
24 & 49
Install lube system & cone crusher
Receive/assemble crusher/lube system
04 JUN 1990 19 JUL 1990
28 Install magnets/associate
d
Install magnets/associated 02 JUL 1990 11 JUL 1990
43 Install pump – sag Install pump – sag 06 JUN 1990 06 AUG 199044 Install vibrating
screensReceive/assemble vibrating
screens18 JUN 1990 13 JUL 1990
As-Built Dates
Item #
Item Description Detail Actual Start Date Actual Finish Date
17 Install plate work –sag
Install plate work –sag
20 AUG 1990 29 AUG 1990
24 & 49
Install lube system & cone crusher
Receive/assemble crusher/lube system
13 AUG 1990 17 AUG 1990
28 Install magnets/associated
Install magnets/associated
13 AUG 1990 29 AUG 1990
43 Install pump – sag Install pump – sag 19 JUL 199004 SEP 1990
15 AUG 199014 SEP 1990
44 Install vibrating screens
Receive/assemble vibrating screens
25 JUL 1990 22 AUG 1990
As-Planned vs As-Built Schedule (Area_5)
Delay: 3.43M
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Causes & Effects Relationship:
Cause Effect Relationship
Delayed Access To Magnets Magnets Installation Is
Delayed
Late Delivery Of Magnets Delayed The
Installation
Delayed Access & Availability Of Cone Crusher
Plate work Installation Is
Delayed
Crusher Feed Chutes Is Needed To
Install The Plate work
Hold Placed By WelOn-Cone Crusher Assemble &
Installation
Cone Crusher
Installation Is Delayed
Change In Design & In Method Of
Construction Needs Extra Time
Non-Availability Of Cone Crusher Components
Cone Crusher
Installation Is Delayed
Difficulty In Obtaining Parts For Cone
Crusher Delayed The Installation
Availability Of Lube Unit Lube System
Installation Is Delayed
Lube Unit Is Needed To Install The
Lube System
Impact Analysis: (Refer to Daily Site Report)
Delayed Access to Magnets: Row code number: 1331 to 1332
Delayed Access and Availability of Cone Crusher: Row code number: 1348 to 1355
Hold Placed by Wel on Cone Crusher Assemble and Installation: Row code number: 1348 to 1355
Non-Availability of Cone Crusher Components: Row code number: 1356 to 1358, 1363
Availability of Lube Unit: Row code number: 1325 to 1330
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Change Orders:
Number of Change orders: 64 Total Number of Orders: 19
Area # 6 – Secondary Grinding
This is an existing area where Contractor was required to carry out modifications to
existing equipment, removal of existing equipment, and installation of new
equipment. Ore, in the form of a slurry, originating from the SAG mill is fed into the
cyclone clusters and then into the ball mills. There is one ball mill for each cyclone
cluster. The ball buckets feed steel balls into the ball mills. The ball mills rotate and
break the slurry down into finer material for further processing.
Scope Of Work:
1. Remove one existing cyclone cluster;
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2. Receive and install 3 new cyclone clusters (each consists of a combination of
steel cones, bowls and basins and is about 13 feet in diameter, is about 14
feet high and weighs about 3 tons);
3. Remove the existing pinion and bearings and replace these with new
assembly components on ball mills 4 and 5;
4. Remove the discharge trommel from ball mill 4;
5. Carry out piping work on ball mill 3, 4 and 5;
6. Install a reservoir and a series of chutes to feed balls into ball mills 3, 4 and 5.
Unpaid Man-hours:
Item # Item Description
Detail Estimated Man-hours
Earned Man-hours
Unpaid Man-hours
16 Install ball bucket
Install ball bucket
271 271 0
22 Install cyclone clusters
Install cyclone clusters
519 519 0
23 & 26 Ball mill # 5/ Modify existing
mills 3 & 4
Modify existing mills 3,4, & 5
383 214 169
Total Unpaid Man-hours 169
Extra Man-hours:
Item # Item Description Regular Man-hours Premium Man-hours
16 Install ball bucket 0 022 Install cyclone clusters 0 023 Ball mill # 5 0 026 Modify existing mills 3 & 4 227 7
Total 227 7
Late Equipment Delivery Dates:
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Item # Item Description
Equipment # Contract Date Actual Delivery Date
Delay Time
16 Install ball bucket
33-CH-119 30 MAY 1990 22 JUN 1990 23 DAYS33-CH-120 30 MAY 1990 22 JUN 1990 23 DAYS33-CH-121 30 MAY 1990 22 JUN 1990 23 DAYS33-CH-122 30 MAY 1990 22 JUN 1990 23 DAYS
22 Install cyclone clusters
N/A N/A N/A N/A
23 Ball mill # 5 N/A N/A N/A N/A
26 Modify existing mills 3 & 4
N/A N/A N/A N/A
Delay Analysis:
As-Planned Dates
Item # Item Description Detail Planned Start Date Planned Finish Date22 Install cyclone
clustersInstall cyclone
clusters04 JUN 1990 22 JUN 1990
23 Ball mill # 5 Modify existing mill # 5
09 JUL 1990 23 JUL 1990
Install ball mill equipment
09 JUL 1990 23 JUL 1990
26 Modify existing mills 3 & 4
Modify existing mills 3
04 JUN 1990 20 JUN 1990
Modify existing mills 4
15 AUG 1990 17 AUG 1990
As-Built Dates
Item # Item Description Detail Actual Start Date Actual Finish Date22 Install cyclone
clustersInstall cyclone
clusters23 JUL 1990 17 AUG 1990
23 Ball mill # 5 Modify existing mill # 5
23 JUL 1990 29 AUG 1990
Install ball mill equipment
23 JUL 1990 29 AUG 1990
26 Modify existing mills 3 & 4
Modify existing mills 3
06 SEP 1990 26 SEP 1990
Modify existing mills 4
14 NOV 1990 18 DEC 1990
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As-Planned vs As-Built Schedule (Area _6)
Delay: 3.90 M
Causes & Effects Relationship:
Cause Effect RelationshipAccess Problems To Install
CycloneCyclone Cluster
Installation Is Delayed
Late Completion Of Structural Steel & The
Cyclones Were Delivered In A Broken State
Access Problems To Install Ball Mill # 5
Ball Mill # 5 Installation Is
Delayed
Late And Changing Delivery Of New Pinion
For Ball Mill #5 & Difficulties With The
Alignment Of The Mill
Extra Work Done By INCO Ball Mill # 5 & Cyclone
Clusters Installation Is
Delayed
Hold While Inco Flipped Bull Gear,
Unavailability Of Inco Overhead Crane, &
Incorrect Bolts Supplied
Late Delivery Of Pinion Ball Mill # 5 Installation Is Pinions Are Needed To Complete Installation
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Assembles Delayed
Additional Work: Repositioning Of Ball Mill # 5
Ball Mill # 5 Installation Is
Delayed
Additional Work Needs Additional Time
Impact Analysis: (Refer to Daily Site Report)
Access Problems to Install Cyclone: Row code number: 1410
Access Problems to Install Ball Mill #5: Row code number: 1412 to 1414
Extra Work Done By INCO: Row code number: 1411, 1415
Late Delivery of Pinion Assembles: Row code number: 1416 to 1417
Additional Work: Repositioning of Ball Mill #5 :Row code number: 1418
Change Orders:
Number of Change orders: 11 Total Number of Orders: 51
Area # 7 – Piping
Unpaid Man-hours:
Item # Item Description
Detail Estimated Man-hours
Earned Man-hours
Unpaid Man-hours
14 Fab/erect utility piping
Fab/erect utility piping – ore storage
1,255 1,255 0
Fab/erect utility piping – sag
493 346 147
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25 Install hydraulics
Receive/assemble hydraulics
14,439 14,006 433
41 Process piping Fab/erect process piping - sag
775 775 0
Total Unpaid Man-hours 580
Extra Man-hours:
Item # Item Description Regular Man-hours Premium Man-hours14 Fab/erect utility piping 108 425 Install hydraulics 38 1341 Process piping 932.5 44
Total 1,078.5 61
Late Equipment Delivery Dates:
Item # Item Description Equipment # Contract Date Actual Delivery Date
Delay Time
14 Fab/Erect Utility Piping
N/A N/A N/A N/A
25 Install Hydraulics
33-HU-102 01 JUN 1990 07 DEC 1990 3M +17DAYS33-HU-102M 01 JUN 1990 17 OCT 1990 4M +16DAYS33-HU-103 01 JUN 1990 7 DEC 1990 3M +17DAYS
33-HU-103M 01 JUN 1990 17 OCT 1990 4M +16DAYS33-ZN-101 30 JUN 1990 17 OCT 1990 3M +17days33-ZN-102 30 JUN 1990 17 OCT 1990 3M +17days33-ZN-103 30 JUN 1990 17 OCT 1990 3M +17days33-ZN-104 30 JUN 1990 17 OCT 1990 3M +17days
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33-ZN-105 30 JUN 1990 17 OCT 1990 3M +17days33-ZN-106 30 JUN 1990 17 OCT 1990 3M +17days33-ZN-107 30 JUN 1990 17 OCT 1990 3M +17days
41 Process Piping N/A N/A N/A N/A
Delay Analysis:
As-Planned Dates
Item # Item Description
Detail Planned Start Date Planned Finish Date
14 Fab/erect utility piping
Fab/erect utility piping – ore
storage
04 JUN 1990 16 AUG 1990
Fab/erect utility piping – sag
25 JUN 1990 08 AUG 1990
25 Install hydraulics
Receive/assemble hydraulics
04 JUN 1990 13 JUL 1990
41 Process piping Fab/erect process piping - sag
30 APR 1990 24 AUG 1990
As-Built Dates
Item # Item Description
Detail Actual Start Date Actual Finish Date
14 Fab/erect utility piping
Fab/erect utility piping – ore
storage
23 JUL 1990 14 SEP 1990
Fab/erect utility piping – sag
17 SEP 1990 21 DEC 1990
25 Install hydraulics
Receive/assemble hydraulics
06 AUG 1990 15 AUG 1990
41 Process piping Fab/erect process piping - sag
16 JUL 1990 21 DEC 1990
As-Planned vs As-Built Schedule (Area _7)
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Delay: 3.90
Causes & Effects Relationship:
Cause Effect Relationship
Late Delivery Of Hydraulic
Units
Hydraulic Unit
Installation Is Delayed
Units Are Needed For Complete
Installation & Lack Of Drawings For
Routings
Process Piping Access Process Piping Is
Delayed
Lack Of Support Steel
Utility Piping Access Utility Piping Is Delayed Difficulty In Obtaining Routing & Lack Of
Drawings For Routings
Change Orders:
Number of Change orders: 53 Total Number of Orders: 170
Summary of overall project:
Area # UnpaidMan-hours
ExtraRegular
Man-hours
ExtraPremium
Man-hours
Number OfChangeOrders
Total Number OfOrders
0 0 1,226 84.75 19 62
1 21 296 97.5 12 90
2 81 1,558 314.5 79 316
3 0 258 33 19 105
4 689 2,554.5 927.5 146 557
5 190 1,245.5 135 64 190
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6 169 227 7 11 51
7 580 1,078.5 61 53 170
TOTAL 1,730 8,444.5 1,659.25 403 1,541
Total Delay:
Contract Start Date: 30 APR 1990 Actual Start Date: 03 MAY 1990
Contract Finish Date: 31 AUG 1990 Actual Finish Date: 14 DEC 1990
Contract Total Duration = 4 months (124 days)
Actual Total Duration = 7.5 months (229 days)
Total Delay = 229 – 124 = 105 days
Contractor’s Delay = 7 days (According to the labor strike on November for one week)
Owner’s Delay = 98 days
Charged Delay In DAYS Charged Delay In WEEKS Charged Delay In MONTHS
98 14 3.27
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As-Planned vs As-Built Schedule (Overall project)
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Delay: 3.50 M
Qualification of the Claim:
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Man-hours:
Description Man-hours Rate ($ / HR.) Cost ($)
Unpaid 1730 40 69,200
Extra Regular 8,444.5 40 337,780
Extra Premium 1,659.25 40 x 1.5 99,555
Total 506,535
OVERHEAD COSTS :
The several delays that occurred in this project caused the overhead costs of the
contractor’s site and headquarter offices to increase dramatically. The amount of the
overhead claim is equal to the fixed cost of the site office plus the portion of the fixed
cost of the head office for this specific project.
The fixed cost of the site includes the telephone billing, transportation, equipment, site
office cost, salary of the general foreman as well as the salary of the project manager for
the delay period.The headquarter cost regarding this specific project is equal to the
portion of the headquarter work on this project times the total billing for this specific
project. Portion of the work regarding the project is simply equal to the total head office
overhead divided by the total company billing.
Site Overheads:
Site overhead Rate Per Period ($ / Period) Charged Delay Period COST ($)
General Foreman 4,500 / month 3.27 months 14,715
Phone/Utilities on Site 400 / month 3.27 months 1,308
Site Office Trailer & Support
500 / week14 weeks 7,000
Crane/Tools 250 / day 98 days 24,500
Total 47,523
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Office Overheads:
Head Office Overhead = $ 600,000 / year
Contract Amount = $ 2,500,000
Total Company Billings = $ 8,000,000 / year
Allocable Overhead = (2,500,000 / 8,000,000) x 600,000 = $ 187,500
Daily Allocable Overhead Rate = 187,500 / 229 = $ 818.8/ day
Office Overhead Rate Per Period ($ / Period) Charged Delay Period Cost ($)
Project Manager 6,250 / month 3.27 months 20,437.55
Head Office 818.8 / day 98 days 80,242.45
Total 100,680
Change Orders:
From Summary Of Communications.
Change Order # Date Cost ($)
1 21 NOV 1990 24,173
2 21 NOV 1990 139,979.04
3 6 DEC 1990 43,061.98
4 21 DEC 1990 455,342.92
Total 662,557
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Drawing Revisions:
From Summary Of Communications.
Drawing Revision # Date Cost ($)
1 22 AUG 1990 449,459
2 17 OCT 1990 4,049
3 26 NOV 1990 155,342
4 11 DEC 1990 568,407
Total 1,177,257
Loss of Productivity:
There are different methods to calculate the efficiency of the crews working on each
project. The total loss in productivity due to the points mentioned before is estimated
based on the Charles Leonard method by using the Charles Leonard charts. To find the
effect of changes on the productivity, the costs of change orders and reissuing of
drawings were added and divided by the contract price. From the charts, using the line
with two major causes for drawings and change orders, the amount due to loss in
productivity is determined
Total Number of Change Orders: 403
Total Number of Orders: 1,541
% Of Change Orders: (403 / 1,541) x 100 = 26.15 %
% Of Loss of Productivity: 20%
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Qualification of the Claim
Man-hours $506,535
Site Overheads $47,523
Office Overheads $100,680
Change Order $662,557
Drawing Revision $1,177,257
Total cost $ 2,494,552
Loss of Productivity Cost = % loss of productivity x Total Costs
= 0.20 x 2,494,552 = $ 498, 910
Interest (2%):
Total Costs from = $2,494,552 +$498, 910= $2,993,462
Total Interest Cost = % of interest x Total Cost = 0.02 x 2,993,462= $59, 869
Total Claim Cost:
Total Claim Cost = $2,993,462+$59, 869=$3,053,331
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Conclusion:
Item Description Amount ($)
1 Change Orders 662,557
2 Drawing Revision 1,177,257
3 Man-hours 506,535
4 Site Overheads 47,523
5 Office Overheads 100,680
6 Loss of Productivity 498,910
7 Interest (2%) 59,869
TOTAL AMOUNT: 3,053,331
Two Legal parties signed a Lump Sum contract. The job consists of erecting a erect mechanical equipment and install piping included in the SAG MILL MECHANICAL contract. As every construction job, both entities encountered several obstacles during construction, which led to problems, delays and claims. The amount claimed by the contractor from the owner is mainly for the reason that the progress of work was affected throughout the whole project by the following:
Changes in information regarding delivery of equipment, Changes in access for unloading equipment, changes in access for the
erection work, Changes in the methods specified. Changes to the scope of work to be performed.
These changes decrease the effectiveness of the work force, which had been mobilized. The lack of advance information regarding the changes prevented Contractor from optimizing changes in their planning, such as postponing part of their mobilization, and optimizing the use of its resources, which resulted in additional costs.
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