Quantity Survey

QUANTITY SURVEY QUANTITY SURVEY AND AND

BILL OF QUANTITYBILL OF QUANTITYCONCEPTCONCEPT

ACTIVITY LEVEL PLANNING SYSTEM

Quantity Survey - DefinitionQuantity Survey - Definition

• To calculate the quantities in a predetermined structured way.

• Bifurcating the project into small areas.

• Identifying the each activity with unique mark numbers.

• Data Base Management

Quantity Survey - StandardsQuantity Survey - Standards

• Contract Technical Documents

• IS Codes

Quantity Survey - AdvantageQuantity Survey - Advantage

• Tracking Scope

• Precise Resource Planning

• To avoid multiple working by various level persons

• Uniformity in Reporting & Billing

• Faster Certification

Quantity Survey - Basic - CivilQuantity Survey - Basic - Civil

• Unique Identification mark for

Drawing Number with Rev. Number

Area Code

Mark Type

Item Code

Mark Number

AreaArea• Main Project - Hydrogen Unit

- Reformer Section

- Compressor House

- Technological Structure

- Pipe Rack

- PSA Foundations

- Cable Trench

- Paving etc

Mark Type for CivilMark Type for Civil

• Pile Cap - PC

• Pedestals - PD

• Plinth Beam - PB

• Beams & Slab - BS etc

QS Code & Client CodeQS Code & Client Code• QS Code is nothing but the Client Items.

For ExampleQs Code Client Code Item Description

1 1.10 Excavation in ordinary soil1a 1.10 a Excavation in ordinary soil upto 2m1b 1.10 b Excavation in ordinary soil 2 - 3.5m1c 1.10 c Excavation in ordinary soil below 3.5m2 1.20 Back Filling with Excavated Earth3 1.30 PCC 1:4:84 1.40 RCC M205 1.50 Formwork

5a 1.50 a Formwork Straight5b 1.50 b Formwork Curved6 1.6 Rebar

6a 1.60 a Rebar upto 12mm dia6b 1.60 b Rebar 16mm & above

Mark No.- CivilMark No.- CivilConstructable Units are to be given separate Mark Constructable Units are to be given separate Mark Numbers. For ExampleNumbers. For Example

Raft - RFT1

PD1 PD2Pedestals

Mark Nos.. QS Codes Involved

1) Excavation

2) PCC

3) Rebar

4) Form work

5) Foundation Bolt

6) RCC

7) Back Filling

Mark Number - CivilMark Number - Civil

SNO UNIQUE ID UOM QTY 1 195-1/PR-A/RFT/67A/RFT-1 CUM 14.40Here,

1951 - Represents A drawing code for drawing no 195 Rev 1 which has been referred for calculating quantity.

PR-A Represents Area code for Pipe Rack for “A” Row

RFT Represents a code for type of structure which in this case is Foundation Raft.

67A Represents Activity code for item “R.C.C. in foundation M-25 Grade.

RFT-1 Represents Mark No. as shown in the above referred drawing or as suggested by the quantity surveyors for easy identification ie the Raft for pipe rack grid 1

Quantity Survey - Basic - Quantity Survey - Basic - StructuralStructural


Drawing Number with Rev. Number

Area Code

Mark Type

Mark Number

Mark Type for StructuralMark Type for Structural

• Column - C• Crane Girder - CGR• Cross Beam / Tie Beam - CB / TB• Trestle - TRL• Bracing - BCG• Gusset Plate - GT• Bracket - BKT• Truss - TRS

Mark Number - StructuralMark Number - Structural

Pipe Rack Portal No.:1

Portal Column RHS

P1CR

Portal Column LHSP1CL

Portal BeamP1B1

P1B2

BracketBKT1

Bracing BCG1

Item No.: StructuralItem No.: Structural

Portal Column Mark No.: P2CR

2 Base Plate3 Stiffener

5 Rib Plate

6 Cap Plate 7 Bracket8 Moment Plate

1 Column ISMB

4 Gusset Plate

10 Rod

9 Chair Cleat

Mark Number - StructuralMark Number - Structural

SNO UNIQUE ID UOM QTY 1 195-1/PR-B/C/P2CR MT 2.50Here,

195-1 Represents A drawing code for drawing no 195 Rev 1 which has been referred for calculating quantity.

PR-B Represents Area code Pipe Rack in row “B”

“C” Represents a code for type of structure which in this case is Column.

P2CR Represents Mark No. as shown in the above referred drawing - Right Side Portal Column in Grid No 02.

STRUCTURAL - GeneralSTRUCTURAL - General

• Establishing Marking concepts with detail.

• Change of Sections updation at regular intervals

• Unit weights approvals

• Rolling Margin Establishment

Quantity Survey - Basic - PipingQuantity Survey - Basic - Piping


Area / Line Number

Service

Specification

ISO No. (Drg No.)

Spool Number

Service - ExampleService - Example

• Process Water - PW

• Cooling Water - CW

• Lube Oil - LO

• Purging Oil - PO

• Steam Line Low Pressure - SL

• Steam Line Medium Pressure - SM

• Steam Line High Pressure - SH

Mark Number - PipingMark Number - Piping

SNO UNIQUE ID UOM QTY 1 AG/10SW/1502/A1A/SP21 ID/IM 50/100Here,

AG Represents Area Code for Above Ground Piping

10SW Represents the Size & Service - 10” Line for Service Water.

1502 Represents the line number which is from ISO itself.

A1A Represents the Specification of pipe - Material & Class.

SP21 Represents Spool Number.

PIPINGPIPING

• Marking the Field Joint in line with GAD

• Spoolwise BOQ Calculation

• Different Symbols for Shop / Field Joint

• Releasing the ISO & Joint Master along with ID / IM Calculation

PIPINGPIPING

• Updation of Revision Drawings & Calculation as per revision using suffix for the joints.

• Separate Marking for Joints Deleted, Modified, Tie Joints, Repair due S/C’s mistake.

• As built drawing after completion

PIPING BOQPIPING BOQ

Spool No.: 21BOQ

1) Pipe size & length2) Elbow size & length3) Valve size & length

Joint Master

1) No. of shop joint & size 2) No. of field joint & size

Total Inch Mtr. of Spool 21

Total Inch Diaof Spool 21

ISO No. 1502

1

2

3

4

5

6

Process Cycle - Quantity SurveyProcess Cycle - Quantity Survey

BOQ Preparation by SE/QS

Cross Checking by PE

Submission to Client

Approval by Client by QS/PE

Copy to SEExecution

Deviations/Change of sections from SE

Incorporation in QS

Submission & Approval from Client by QS/PE