S.Kameshwaran

Welcome to the Presentation on

Pre-Tender Estimate

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Contents

Before You Start

Design Steps

Lighting

Earthing

Cabling

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Before You Start

Check the Documents Step-1 : Ensure that all the documents mentioned in the NIT are enclosed or

not. If not notify BU immediately. Step-2 : Check whether the documents enclosed are sufficient or not. If not,

notify BU immediately. Step-3 : Ensure that the documents have reached other departments

concerned also (Civil / Instrumentation).

Time Schedule Step-1 : Check the date of raising the queries, Prel. BOQ & Final BOQ. Ask for sufficient time for raising the Query (Query shall be raised only after

clear understanding of Scope, Design Input Adequacy check)

Who is the owner? You are the owner for the tender. While committing the dates for Query,

BOQ etc., please consult other disciplines also.

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Before You Start

Record Keeping Ensure that all your workings are done in a separate Writing Pad. No loose

papers Store all your files in Server only (Never in Local) Record important oral discussions with BU and Vendor

Calculations Automate your work as far as possible (Useful for revisions) First timers – Do the calculations using calculators once. Prepare a summary (Ensure that there is no carry forward error) Understand the concept of the calculation before using the template.

DIRACL Use DIRACL format at the beginning itself and raise queries based on this

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Diagram

Vendor offer review

Estimation by us.

Pre-Tender Job

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Steps

Queries

Preliminary BOQ

Final BOQ

Queries shall include all disciplines & equipment related queries also.

Preliminary BOQ shall contain all the items required for estimation.

Quantity need not be accurate .

No more item shall be added in Final BOQ

Final BOQ shall contain all items with exact quantity.

DBR shall be attached with Deviations and QPs

Post order Design Fee to be included

Lighting

Photometry

Luminous Flux

Illuminance

Luminous Efficacy

Light Output Ratio

Glare

Reflectance

Uniformity

Maintenance Factor

Black Body Radiation

Colour Temperature

Colour Rendering Index (CRI)

Metamerism

Lighting

Lighting requirement are based on the following lighting engineering criteria

Lighting level Glare restriction Direction of incidence of light and shadow effect Colour appearance and colour rendering

Lighting

NO. of Fittings = Lux Level x Area to be Illuminated Required (Lumen Output Per Fitting x COU x LLF)

L x WRoom Index =

Hm (L+W)

L = Room Length W = Room Width Hm = Mounting Height of Fitting (from working plane) Work Plane = Desk or Bench Height

Where:

Lighting

Typical values of LLF or Maintenance Factor:

Office & air conditioned interiors = 0.8Industrial interiors prone to dust accumulation = 0.7Industrial interiors with highly dust prone areas = 0.6

Lighting

MLDB - Incomer (ACB/MCCB/ SFUs) Outgoing (MCCB/SFUs/MCBs)

Sub DB/ Feeder Pillar- Area wise (voltage drop/ optimising cables) Depending upon requirement

Lighting panel Incomer (MCB cum ELCB)/ Outgoing with necessary phase segregation (MCB)

Lighting

MLDB

LIGHTING TRANSFORMER

PCC

SUB LDB

FEEDER PILLER MCB DB

LightingLamps Wattage Lumen Color lamp (k)

GLS Lamps

25 230 -

40 415 -

60 710 -

100 1340 -

200 3000 -

FTL Lamps

20 940 6500

36 2450 6500

40 2450 6500

54 4500 6500

CFL Pin Type

9 600 6500

10 600 6500

11 900 6500

13 900 6500

18 1200 6500

26 1800 6500

LightingLamps Wattage Lumen Color lamp (k)

HPMV

80 3400 4200

125 6200 4200

250 12750 4200

400 22750 4200

HPSV

70 5600 1950

150 13500 1950

250 26000 1950

400 42300 1950

METAL HALIDE

70 5600 4300

150 11500 4300

250 20000 4300

400 35000 4300

Halogen Lamps

300 5000 -

500 9500 -

1000 20000 -

Earthing

Main Earthing Conductor (Below Ground)

Bare conductor buried under ground, forms the main earth grid.

• For switchyard, earth mat is formed.

• For Plant area, Earthing network is formed interconnecting all

individual plant earth grids.

Equipment Earthing conductor (Above ground)

Equipment body Earthing

MV/LV switchboard Body Earthing

Cable tray Earthing

Earthing

Treated Earth pit

Directly driven earth electrode

Plate electrode

Deep bore earth electrode

Earthing

Factors affecting Soil Resistivity

Type of soil

Moisture

Dissolved salts in water

Temperature

Grain Size

Seasonal Variation

Artificial Treatment