V3 3 Method of Measurements

Synchrotron Light Source for Experimental Science and Application in

the Middle East (SESAME)

COOLING AND HVAC SYSTEMS

VOLUME III

Section 3

Method of Measurements

SESAME COOLING AND HVAC SYSTEMS

M 2 Methods of Measurement

PREAMBLES (FOR ELECTROMECHANICAL WORKS)

1. The Bills of Quantities shall be read in conjunction with the Instructions to Bidders,

General and Special Conditions of Contract, Technical Specifications, Appendices

and Drawings. The documents are to be taken as mutually explanatory and inter-

related to one another.

2. Unless otherwise mentioned, all quantities of works shall be measured “Net” in

accordance to the drawings or/as ordered by the engineer, and generally, according to

method of payment mentioned in the tender documents.

3. In the case of discrepancy in quantities of works performed by the contractor and

those shown on the drawings, and should such discrepancy by acceptable to the

employer, then the quantities agreed by the Engineer shall be taken into account in the

measurement of quantities.

4. All quantities shown in the Bill of Quantities re approximate, and the purpose of such

quantities is to obtain a close estimate of the value of the works. However, the

contractor shall be paid for the actual amount of work the contractor carries out in

accordance with the contract, as determined by direct measurement during the

progress of the works whether the actual quantities are more or less than those shown

in the Bills of Quantities. Those quantities are not intended to be used by the

contractor for the ordering of materials.

5. The Unit Price and the rates inserted in the Bills of Quantities respectively shall be

comprehensive and shall include for complying in all respects with the requirements



of the Technical Specifications, drawings and all other related tender documents. This

shall cover all the obligations under the contract and all matters deemed necessary for

the proper construction, completion of and remedy of defects in the works. No claims

for additional payment will be allowed for any error, or misunderstanding of the work

involved by the contractor.

6. In the Bills of Quantities, a unit price or rate shall be inserted against its respective

item with quantities only. The value of any item left un priced shall be deemed to be

covered by other rates and prices entered in the Bills of Quantities.

7. All measurements of the executed works called for in the Contract shall be based on

the unit price stated in the Bills of Quantities and made according to the

specifications. Any work done by the Contractor, but not called for in the Contract or

not requested in writing by the Engineer, shall not be included in the measurement.

8. The unit rate of the materials and equipment shall be based on the Specification, all

components as required and specified under each item concerned in the

Specifications, Technical Data and Notes on Contract Drawings, and all other

Contract documents.

MECHANICAL WORKS (CONT'D)

9. The Bills of quantities are classified under headings and sections with the same

reference numbers and titles as the specifications.

10. Each section referred to in the Bills of quantities shall be read in conjunction with the

respective section and with all other related sections of specifications.

11. The Bills of Quantities, Specifications, Schedule of Equipment and Drawings and all

other Contract documents are complementary to each other.

12. It is the responsibility of Contractor to check the locations and quantities of the

materials and equipment to be executed in accordance with the contract drawings.

13. The Unit Rate shall include the following:

(The following requirements are complementary to the mentioned items in the B.O.Q.),

General

1. Supply of materials and equipment.

2. Off loading and handling from trucks on site to place of installation.

3. Installation of materials and equipment.



4. All civil work required and connected with the mechanical installations, such as :

equipment concrete bases and supports, cutting through walls and slabs for passage

of pipes and conduits and ducts, pipe sleeves, re-patching, fixing of pipe and duct

hangers and supports to structure, wooden frames for air outlets and louvers and wall

mounted fans, excavation and back fillings, riggings, hosting, water proofing,

cleaning, protection and painting..

5. All testing balancing, adjusting, commissioning and handling to client complete

operational systems and equipment.

6. Allowance for cleaning and for proper protection of all equipment plants, electrical

installations and structures during insulation and paintings.

7. Disinfection, flushing and water treatment.



MECHANICAL WORKS

General (Cont’d)

8. All labor, materials, tools, instruments, electric power supply fuel and water required

for installation, testing, balancing, adjusting, disinfection, flushing, operation and

commissioning.

9. Thermal insulation for all equipment, valves, trimming and accessories.

10. System identifications, tags, labels, nameplates and charts.

11. Shop-drawings and record drawings.

12. Spare parts and components for ideal running of all services and equipment.

13. Spare parts information and tools.

14. Operation and maintenance manuals.

15. Training.

16. Samples as required by the Engineer.

17. Inspection, testing and rejection of all materials and workmanship.

18. Maintenance of all items supplied by contractor as per Contract Conditions.

19. The price of all electrical driven equipment is deemed to include coordination for all

electrical wiring, conduits, earthing, cables cable trays, cable ladders, fixations with

all accessories.

20. All electrical wiring, steel conduits, earthing, cables, cables trays, cables ladder,

fixation, complete with all accessories for the connections from the nearest isolation

switch to the equipment with connection of mechanical equipment

21. Surface treatment, priming, under coating, barrier coating, finish painting and

protective paintings and labelling as described in the specifications.

22. Silencer splitters, buffles, profile steel frames, angle frames, boltings to the served

equipment and ducting protection against corrosion and erosion as per specialized

recommended manufacturer.

Note :

a. The unit rate shall also include supply, install test and commission of all equipment

relate trimmings and accessories as shown on drawing or called for in specifications.



MECHANICAL WORKS

General (Cont’d)

b. Where duct lining installed, the net dimensions shall be as per design drawings. The

unit rate of duct works shall be based on the net free dimensions of actual internally

installed duct work and without calculating of neoprene dimensions and the weight of

joints, hangers, supports, seams, lapping, stiffener, dampers vanes, angles ….etc,

which shall be included in the unit rate.

B. Mechanical Materials and Equipment

(Such as but not limited)

1. Pipe work: galvanized steel, iron, Black steel, copper, stainless steel, Random for all

services.

The unit rate shall deemed to be include all pipe fittings and joints such as elbows,

bends, tees, reducers, unions, expansion joints, flanges, anchoring, sleeves, floor plates,

puddle flanges, safety valves, pressure and temperature gages, balancing and measuring

taps, test plugs and test points, sockets and all joining materials, and pipe hangers and

supports, and expansion bellows loops and joints, thermometers, flexible connection and

joints, fire retardant and protection sealants for all pipes crossing fire rated structures,

automatic air vents with isolating valves, all p-traps, s-traps, pipe cleanouts, drain cocks at

bottom of risers and main pipes for drainage system, adapters and dielectric unions for

connecting dissimilar materials, excavation and back-filling, chasing in walls, painting,

pipe protection against corrosion, pipe coating, all kind of valves, fixed orifice double

regulating valves measuring tabs and orifices unless other wise indicated on B.O.Q and all

accessories as required per specifications and drawings.

Pipe work shall be measured in meter (M).

2. Ductwork: For Ventilation and Air Conditioning.

a. The unit rate shall include metal sheets ducting with all joints,

sealant compound, fire retardant sealants for all ductwork passing through

fire rated structures, hangers and supports and brackets, reinforcing angles,

flexible connections, bird screens, volume access doors and panels, all

vanes, volume splitter damper (VSD), volume control and regulating

damper, fire dampers, smoke dampers, fire and smoke dampers, expansion

with rod and lock screws, coating, painting all joints, plenum boxes, sound

attenuaters, volume damper, adapter and coupling unless other wise

indicated on B.O.Q and all accessories as specified and as show on

drawings.



MECHANICAL WORKS

General (Cont’d

b. Ductwork weight shall be calculated net in kg unless otherwise

indicated in B.O.Q (the calculation taken from the approved shop

drawings based on the dimensions and length of actual installed

ducting only without calculating the weight of joints, hangers,

supports, seams, lapping, stiffener, dampers vanes, angles etc.

which shall be included in the unit rate).

c. Where duct lining installed, the net dimensions shall be as per

design drawings. The unit rate of duct works shall be based on the

net free dimensions of actual internally installed duct work and

without calculating of neoprene dimensions and the weight of

joints, hangers, supports, seams, lapping, stiffener, dampers vanes,

angles ….etc, which shall be included the unit rate.

B. Mechanical Materials and Equipment (Cont’d)

3. Insulation : The unit rate shall include all joints, sealant compounds, bands, vapour

barrier, and all finishing, coating protection and cladding with all accessories as called for

in the specifications.

Duct insulation shall be measured in square meter (m2) for the installed ducting.

Pipe insulation shall be measured in meter (m) stated the diameter of pipe.

4. Flexible Duct

a. Flexible duct shall be measured net by length (taken from the approved shop

drawings) based on the dimensions and length of actual installed ducting taken

along the center line over all fittings.

b. The unit rate shall include sealant compound , fire retardant sealants,. Hangers,

supports, brackets, flexible connections, plenum boxes, joints, painting , adapter

and coupling ,all accessories as specified and as shown on drawings.

5. Diffusers, Air grills , registers

a. The unit rate shall include all materials associated and components, flashing,

clips, shims, fastening devices, separating panels, anchors, painting, frames,



flashing, neoprene gaskets, all accessories and associated works shown on

drawings and indicated as per specifications.

MECHANICAL WORKS

6. Air Handling Unit:

a. The unit rate shall include all parts including mixing box with return air and fresh

air dampers manual or motorized (as required), humidfire, cooling and heating

coils, electric reheat coils silencers and sound attenuators, all kinds of filters,

condensate drain arrangement, vibration isolators, flexible connection on fan

discharge, orifice plates, one set of spare belt drives per each fan, manometer

across each bag filter, and fan, anti vibration pad and floating base, electrical

connection and all other components as shown on the Drawings and as called for

in the Specifications.

b. Each coil of the air handling unit shall include :

One gate valve.

One commissioning set.

One strainer.

One double regulating valves.

Two pressure gauges.

Test points.

Two thermometers.

Two dielectric unions.

c. Air handling units shall be enumerated (No.)

7. Exhaust Fans:

a. General

The unit rate shall include vibration isolators resilient mountings, skids and

hangers, flexible connections on fan inlet and outlet, filters where required, insect

screen, back draft dampers or automatic shutter, pulleys with taper locks, inlet

guards, belt guards, lubrication points, sound attenuators to achieve the NC for the

served space and the outdoor, one set of spare belt drives per each fan, electrical

connections and all other accessories as shown on drawing and as called in

specifications.

Exhaust fans shall be enumerated (No.).

8. Chillers:



a. The unit rate shall include the chillers, all related valves and

trimmings including one gate valve, one commissioning set,

flexible connections, flow switch, two pressure gauges, two

thermometers, measuring orifice, concrete base vibration isolators

on factory skid and on the chiller base anti vibration pad, control

panels, electrical connection and all other components as shown on

the Drawings and as called for in the Specifications.

b. Chillers shall be enumerated (No.)

9. Pumps: All kinds of pumps for all services

Pumps shall be measured in unit.

a. General

The unit rate shall include isolating valves, globe valves, check valves, strainers,

pressure gauges, pressure relief vent, air release valves, flexible connections,

vibration isolators, control panels, electrical connections, concrete base and inertia

base as shown on the drawings and as called for in the specifications.

b. Variable Speed Pumps.

The unit rate shall include for each pump.

Two isolating valves, check valves, strainer, two pressure gauges, 20mm pressure

relief vent air release valves, two flexible connections, vibration isolators,

concrete base, inertia base.

The unit rate shall also include pump control panel, adjustable frequency driver,

sensor transmitters, differential pressure sensor, and all related power control

accessories as shown on the drawings and as called for in the specifications the

unit price shall also include coordination with the control equipment specialist for

the recommended locations and sizes of all sensor transmitters and differential

pressure sensors.



MECHANICAL WORKS (CONT'D)

10. Motor Control Centers:

The unit rate shall include the enclosure complete with all components and accessories

required for manual and automatic operation as specified; such as: circuit breakers, bus-

bars, push buttons, indication lamps, contactors, relays, over-load protection, interlocking

devices, alternators, selector switches, 3 phase isolating switch, phase failure, phase

reversal, earth leakage protection, voltmeters, ammeters, hour meter for each equipment,

visible and audible alarms, interconnecting wiring, labels for wiring terminals, equipment

served and for enclosure.

11. Control Panels :

The unit rate shall include the enclosure complete with all components and accessories

required for manual and automatic operation as specified; such as: circuit breakers, bus-

bars, push buttons, indication operation and fault lamps, contactors, relays, over-load

protection, interlocking devices, alternators, selector switches, 3 phase isolating switch,

earth leakage protection, interconnecting wiring, labels for wiring terminals, equipment

served and for enclosure.

12. Electrical Installations :

The price shall include all electrical wiring, steel conduits, earthling, cables, cables trays,

cables ladder, fixation, complete with all accessories for the connections from the nearest

isolating switch to the equipment.

13. Painting :

The unit price shall also include surface treatment, priming, under coating, barrier

coating, finish painting and protective paintings and labeling as described in the

specifications.

V3 3 Method of Measurements

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