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HKIS – PQSL (16 Nov 2015)Sr. Kenny LuiBSc, LLB, MMgt, MACSMHKIS, MRICS, RPS(QS), PFM
BASIC UNDERSTANDING OF MVAC SYSTEM AND MEASUREMENT
Prepared by: Kenny Lui 1
What are we going to cover tonight?
What is MVAC System?How to measure it from a QS perspective?
Disclaimer Note
This set of notes has been prepared according to the author’s own experience of therelevant practice and is intended for educational purpose and information only. Noresponsibility for loss occasioned to any person acting or refraining from actionoccasioned by or as a result of any material included will be accepted by the authoror its company.
The materials and information contained herein are not intended to offer or provideany technical advice concerning the topics covered. Please consult professionalengineers or your QS senior where necessary.
What is MVAC System?
MVAC
HVAC ACMV
What is MV?
MVA. Music VideoB. Mechanical Ventilation
What is AC?
ACA. Alternating CurrentB. Air Conditioning
What is MVAC System?
ACMV
8
MV System
9
MV SystemAxial Fans
10
MV SystemCentrifugal Fans
11
MVAC System
http://chemistry.bd.psu.edu/jircitano/gases.html
12
MVAC System
P T
P T
13
MVAC SystemWindow Type Air‐Conditioners Moveable Air‐Conditioners
14
MVAC SystemWall Air Conditioners Ceiling Mounted / Cassette Air‐Conditioners
15
Chillers Cooling towers
Air handling units
16
Fan Coil Units
Pipeworks to / from Fan Coil Units
17
Chilled water pipeworks Insulation
Protective Coverings and Finishings
18
Ductwork Insulation
Protective Coverings and Finishings
19
MVAC System
Chiller AHU / FCU
CHWS
CHWR
Fresh Air Duct
Supply Air Duct
Return Air Duct
Air Grilles
Condensate DrainCondensate Drain
Electrical and Control
PAU
20
MVAC SystemWhat do you hear tonight
What do we not discuss / explore tonight
21
MVAC SystemFurther Reading / Study
http://www.airintelligence.co.uk/wp‐content/uploads/2012/10/cooling‐cooling.jpg
http://ac2015.net/posts/air‐conditioner‐working‐principle/
https://www.youtube.com/watch?v=_lFUlA1PZ8U
How to measure it from a QS perspective?
23
Preparation for Measurement
Drawings
Specifications / Codes of Practices
Standard Method of
MeasurementPreambles
Sample Bills
24
Preparation for Measurement
DrawingsSpecifications / Codes of PracticesStandard Method of MeasurementPreamblesSample Bills, if any
25
DrawingsLegend, Notes & Abbreviations
26
DrawingsLegend, Notes & Abbreviations
27
DrawingsLayout
28
DrawingsLayout
Fresh Air Louvre –Builder’s Trade
29
DrawingsLayout
30
DrawingsLayout
31
At Roof Level
At 1/F
32
DrawingsEquipment Schedule
33
DrawingsEquipment Schedule
34
DrawingsSchematic (Water side)
Plant RoomArea
Non‐Plant Room Area
35
DrawingsSchematic (Water side)
36
DrawingsSchematic (Air side)Mech. Vent.
37
DrawingsSchematic (Air side)A/C
38
DrawingsMVAC Provision Zoning
39
DrawingsTypical Details
40
DrawingsCable Schedules
41
DrawingsElectrical Schematic
42
DrawingsControl Schematic
43
DrawingsLegend, Notes & Abbreviations
Schematic (Air side) A/CSchematic (Air side) Mechanical Ventilation
Typical DetailsElectrical and Control
44
Preparation for Measurement
DrawingsSpecifications / Codes of PracticesStandard Method of MeasurementPreamblesSample Bills, if any
45
Specification / Code of Practice
46
Specification / Code of Practice
47
Preparation for Measurement
DrawingsSpecifications / Codes of PracticesStandard Method of MeasurementPreamblesSample Bills, if any
48
HKSMM 4
Always modified by Preamble
49
HKSMM 4INFORMATION PROVIDED MEASUREMENT RULES DEFINITION RULES COVERAGE RULES
SUPPLEMENTARY INFORMATION
Qty
Classification Table Supplementary Rules
50
HKSMM 4
51
HKSMM 4
52
HKSMM 4
53
HKSMM 4
54
HKSMM 4
55
HKSMM 4
56
HKSMM 4
57
HKSMM 4
58
HKSMM 4
A.
B.
C.
59
HKSMM 4
MEASUREMENT RULES
M.2 Pipework is measured over all inline fittings, short running lengths and branches, but not through items of ancillaries, headings and trapping sets.
M.3 Where an in‐line reduction in diameter occurs at a reducer or tee etc., the largest diameter shall be measured the full length of the fitting.
60
HKSMM 4
C.
61
HKSMM 4
DEFINITION RULES
D.2 Final supports are any element between the structure or the support structureand the pipe.D.3 The term pipework fittings isdeemed to include:(a) Bends, (b) Elbows, (c) Branches, (d) Reducers, (e) Tees,(f) Reducing bends, (g) Reducing tees, (h) Caps, (i) Flanges, and the like.
62
HKSMM 4
COVERAGE RULESC.2 Pipework is deemed to include:(a) Fittings for pipes
63
HKSMM 4In‐line fittings
Accessories
Ancillaries
64
HKSMM 4
65
HKSMM 4
66
HKSMM 4
67
HKSMM 4
MEASUREMENT RULES
M.2 Ductwork rectangular in section is measured over all in‐line fittings, short running lengths and branches, (but not through items of inline equipment).
M.3 Where an in‐line reduction in size (given by circumference/perimeter) occurs at a reducer or tee etc. the largest size shall be measured for the full length of the fitting.
68
HKSMM 4
COVERAGE RULES
C.2 Work is deemed to include all in‐line fittings
C.3 Work is deemed to include all cutting of ductwork to fittings, equipment and ancillaries, and providing all necessary materials, heat, bolts, nuts, washers and everything necessary for making joints and connections.
69
HKSMM 4
70
HKSMM 4
71
Preparation for Measurement
DrawingsSpecifications / Codes of PracticesStandard Method of MeasurementPreamblesSample Bills, if any
72
Preambles
73
Preambles
74
Preambles
75
Preambles
76
Preambles
77
Preambles
78
Preambles
79
Preambles
80
Preambles
81
Preambles
82
Preparation for Measurement
DrawingsSpecifications / Codes of PracticesStandard Method of MeasurementPreamblesSample Bills
83
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
84
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
85
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
86
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
87
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
Cross reference to drawings or specification
Type and duty stated
88
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
89
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
Type of material
Size, gauge or thickness and type stated
90
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
91
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
92
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
93
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
94
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
95
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
To be discussed in Electrical and Control Sections
96
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
97
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
98
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
99
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
100
Sample Bills
https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf
101
A ReminderEquipment
Pipework
Pipework in‐line fittings / ancillaries
Ductwork (rectangular)
Ductwork (circular / oval)
Ductwork in‐line fittings / ancillaries
nr
nr
nr
m
m
m2
102
A Reminder
103
Chilled water pipeworks Insulation
Protective Covering and Finishing
104
Chilled water pipeworks
What about: InsulationProtective Covering and Finishing
105
Chilled water pipeworks / Insulation / Protective Covering and Finishing
106
Chilled water pipeworks / Insulation / Protective Covering and Finishing
107
Ductwork Insulation
Protective Coverings and Finishings
108
Ductwork / Insulation / Protective Covering and Finishing
Insulation to rectangular ductwork is measured the nett area in contact with the base of all ducting as installed and overall ducting fittings and joints
109
Ductwork / Insulation / Protective Covering and Finishing
Protective coverings and finishings to insulated rectangular ductwork is measured the nett area in contact with the base of all ducting as installed and overall ducting fittings and joints
Disclaimer Note
This set of notes has been prepared according to the author’s own experience of therelevant practice and is intended for educational purpose and information only. Noresponsibility for loss occasioned to any person acting or refraining from actionoccasioned by or as a result of any material included will be accepted by the authoror its company.
The materials and information contained herein are not intended to offer or provideany technical advice concerning the topics covered. Please consult professionalengineers / your QS senior where necessary.