Tender Estimate
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Transcript of Tender Estimate
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