Frequent Problems encountered by QS in Building Services Works

Building Services

a) prior knowledge on understanding MEP systems

b) prior knowledge on understanding engineering language

c) prior knowledge on understanding interfacing and/or interdependency relationship between different MEP systems

d) prior knowledge on the installation sequencing and methods of MEP systems

e) prior knowledge on the statutory requirements on MEP systems

f) prior knowledge on the SMM for MEP systems

g) prior knowledge on the market intelligence of MEP works for contractual packaging

h) understanding on how to read the MEP drawings

i) how to extract the information given by the engineers for the pricing of the MEP works

1.0 Electrical Installations 1.1 incoming power supply 1.2 mains and sub-mains installations 1.3 lighting installation 1.4 power installation 1.5 cable containment installation 1.6 emergency generator installation 1.7 lightning protection installation 1.8 earthing and bonding installation 1.9 miscellaneous works (general works)

What is MEP Works – Electrical Works

2.0 Mechanical Ventilation & Air Conditioning Installation

2.1 Condenser water system

2.2 Chilled water system

2.3 Condensate drainage system

2.4 Air conditioning system

2.5 Mechanical ventilation system

2.6 Smoke extraction system

2.7 Automatic temperature control system

2.8 Electrical power and control system

2.9 Miscellaneous works (general works)

3.0 Fire Services Installation

3.1 Incoming water supply

3.2 Fire hydrant and hosereel installation

3.3 Sprinkler installation

3.4 Drencher installation

3.5 FM200 installation

3.6 Automatic fire alarm detection installation

3.7 Electrical power and control installation

3.8 Portable fire extinguishers

3.9 Miscellaneous works (general works)

4.0 ELV Works

4.1 CCTV System

4.2 CABD System

4.3 PABX System

4.4 Security and Access Control System

4.5 Telephone System

4.6 Satellite TV System

4.7 Broadband installation

4.8 Carparking system

4.9 BGM System

4.10 Patrol Guard System

1.0 units (e.g. tonnes, kVA, ampere, kW, lux, etc.)

2.0 schematic design, line diagram

3.0 equipment / materials (e.g. chillers, LV switchboard, MCCB / MCB, busbar, fused connection unit, fast response sprinkler head, 2 way motorized control valve, addressable type detector, axial fan, centrifugal fan, isolating switch, etc.)

4.0 trade (e.g. final circuits, loop, air purging of pipework, ductwork dropper, drain and refill, pump head, etc.)

5.0 testing and commissioning, point schedule, O&M manual, preventive maintenance, corrective maintenance

Main Contract Works Builder’s

Works

HVAC

FS

P&D

ELEC

Materials and equipment submission

Builder’s works drawings submission

Shop drawings submission

Coordinated services drawings submission

1st fixing

2nd fixing

Final fixing

FAT / SAT

Testing and commissioning

Fire services regulations

Smoke extraction

Fire retardant system

2 layers of sprinkler heads

Fire alarm detection (hotel)

Interlock with air ventilation

EPD sound emission requirement

EPD – chimney installation

EPD – sewage water discharge (treatment)

Energy Assessment Ordinance

Measurement of Building Services Installations

1. Hong Kong Standard Method of Measurement for

Building Services Works (First Edition May 1993 / Forth Edition 2005)

2. - Electrical Installations

- Mechanical Installations

- Building Management, Security and Communication Installations

2.1 system classification

2.2 works coverage (e.g. FE, cladding to air duct)

2.3 application (final circuit / wiring & conduits)

3. Things to note:

3.1 interfacing related with building works

3.2 phasing of works

3.3 packaging of works

Market Intelligence on Contractual Packaging

1. Works packaging – separate packages or all-in-one package

1.1 technical complexity 1.2 specialization 1.3 value of works 1.4 coordination complexity 1.5 programming of works 2. Lump Sum or Re-measurement 2.1 nature of the works 2.2 basis of tender information 2.3 basis of final approved information 2.4 basis of measurement

Things to note in preparing the Building Services Tender / Contract Document

1. commencement of works - conditions

2. completion of works - criteria

3. phase completion may affect

- programming of works

- system handover

- defects liability period

- release of retention money

- temporary installations prior to full completion

of a particular system

- maintenance works for partial running prior to

the full completion of a particular system

Payment for Building Services Works

1. Progress / Stage / Milestone interim payment

2. Payment for engineering works

3. Payment for materials on site and off site

4. Payment assessment

- 1st fix

- 2nd fix

- final fix

- T&C

5. Payment withheld for submission of T&C records,

as-built drawings / records, O&M manual

6. Payment for maintenance works / miscellaneous works

Variation Works for Building Services Works

1. Entitlements

1.1 change in builder’s works

1.2 change in level of suspended ceiling

1.3 change in door opening direction

1.4 re-partitioning

1.5 change in room function (e.g. from pantry to

kitchen)

1.6 addition of metal framework at external wall

1.7 revision in fire compartmentation

1.8 as required in statutory inspections

2. Quantum Assessment

- basis of measurement

- change in one item may lead to corresponding changes in other items (e.g. addition of lighting circuits will lead to addition of lighting switches; omission of false ceiling may lead to addition of slim duct to insulated refrigerant pipe work or cladding to chilled water pipe work)

3. Rates Assessment

- contract rates

- pro-rata rates

- star rates

Variation Works for M&E Works (Cont’d)

4. Abortive Works

- entitlement

- evaluation

5. Miscellaneous Works

- draining and refilling

- testing and commissioning

- cleaning of works (e.g. air purging, chemical treatment)

- refueling works

- spare parts and tools

Variation Works for M&E Works (Cont’d)