MS for Ductwork System

Saigon M&C Tower Project Method Statement For Ductworks

Page 2

General Aim Scope of works Methodology

I. Duct Installation Works 1. Air Duct Connection

2. Air Duct Seal

3. Air Duct Insulation

II. Air Devices Installation Works 1. Volume Dampers (VD), Volume Control Dampers (VCD), Fire Dampers (FD).

2. Diffuser, Grille

3. Plenum Chamber, Silencer Chamber

4. Flexible Duct, Canvas Joints

5. Louver, Access Door, Outdooor Hood

A 12/03/09 FIRST ISSUE C.T.P J.R.P L.Q.K N.A.K


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General:

Items: - The Method Statement for Air Distribution Installation Works.

Aim: The aim of works is to describe mechanical works associated with installation of Air

Distribution Installation Works and to ensure compliance with contract requirements,

specification and quality control.

Scope of Works: The scope of work for this method statement shall include all the Ductworks for the

SAIGON M&C TOWER Project.

Methodology:

I. Duct Installation Works: Table1: Rectangular Duct Thickness Schedule

1. Air Duct Connection: Table 2: Regulation for air duct connection Schedule

Corner Angle Duct Connection Companion Angle Duct

Less than 600 (mm) C , TDC NA

601 to 1500 (mm) TDC NA

1501 to 2500 (mm) NA Flange-40x40x3.0mm

Duct size largest

dimension (mm)

Over 2500 (mm) NA Flange-40x40x4.0mm

Maximum Spacing (mm) 1100 1200

Size of Bolt & Nut (mm) 8 mm 8 mm

Diameter (mm) 3.2 mm 3.2 mm Rivet Maximum Spacing on

Center (mm) 65 mm 65 mm

Largest Dimension (mm)

Duct Size (L max) Up to 400 600 800 ~ 1250 1600 ~ 2500 Above 2500

Steel Sheet Thickness 0.5 0.6 0.8 1.0 1.2


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Table 3: Support, hanger, spacing schedule

Duct size Less than

400 400 ~ 999 1000 ~1999

2000 ~

2500 Over 2500

Angle steel V-30x30x2.5 V30x30x2.5 V-40x40x3 V-

50x50x3.5

U-

80x38x3.5

Round bar 2 x Φ8 2 x Φ10 2 x Φ10 2 x Φ10 2 x Φ12 Hanger

Max. pitch L 3000 3000 2500 2500 2500

Angle steel V-30x30x2.5 V30x30x2.5 V-40x40x3 V-

50x50x3.5

U-

80x38x3.5 Vertical

support Max. pitch L One point for each floor

1.1 Duct size over 1500mm:

For duct size largest dimension over 1500mm show be as Figure 01:

Detail A show be as Figure 02, Figure 03:

Figure 01: Typical duct connection detail (using flange joint)

Figure 02: Detail of bolt spacing for flange joint

100

Angle steel flange (see table 02)

Bolt hole 8mm

Sealed

100

100

Concrete slab

Air Duct

Detail A L ≤ 1200

Hanger rod M10

Angle steel (see table 3)

Anchor bolt

W

Air flow Air flow


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1.2 Duct size under 1500mm: For duct size largest dimension under 1500mm show be as Figure 04

Detail B show be as Figure 05, Figure 06, Figure 07

Figure 05: Detail of Cross Aim Brace Spacing

Figure 03: Detail of connection angle for flange

Figure 4: Branch duct connection detail (using Transverse Duct Connector (TDC) joint)

A ≤ 150 mm B ≤ 200 mm 100 mm ≤ C ≤ 150 mm

C

C

B C

A

B C A 4 hole Φ10

Air duct

Cross aim brace

W

Air flow

Air flow

L = 0.25W; L≥150mm

L

Main duct

Detail B

Branch duct

Change between section

Air flow

Rivet 3.2mm

5mm thk Washer Rubber gasket

Width: 25mm, 5mm thk

Air Duct

Angle steel flange (see table 02)

Bolt & Nut 8mm


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Table 4: Size, Thickness and Spacing of TDC Joint Schedule

Duct Size largest dimension (mm) Less than 700 700~1200 1200~1500

Size of TDC Duct End (minimum) (mm) 30 30 30

Thickness of TDC Corner (minimum) (mm) 1.2 1.2 1.2

Thickness of Cross Arm Brace (minimum)(mm) 1.0 1.0 1.0

Maximum Spacing (mm) 1100 1100 1100

Max 1100

Bolt M10

Cross Aim Brace (see table 4)

Air Duct TDC Corner (see table 4)

Figure 06: Cross Aim Brace detail

Bolt M10 TDC corner 1.2mm thk

TDC duct end (see table 4)

Rubber gasket (see figure 08)

Nut M10

Nut M10

TDC flange



Figure 07: Typical TDC assembly detail

Air duct Corner plate (see detail)

TDC joint


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Note:

Support, hanger will be concerned on method statement of M&E Support System Installation

Work: ME - REE - T+ - MS – G+ - GEN - 003

2. Air Duct Seal:

50

Seal TDC joint

Bolt hole 10mm

Air Duct

50

Angle flange joint Bolt hole 8mm

Seal

Air Duct

Figure 09: Position of Seal for TDC Joint

Figure 10: Possition of Seal for Angle Flange Joint

Bolt hole 8mm

Rubber gasket Width: 25mm Thickness: 5mm

15-20mm

Figure 08: Typical rubber gasket installation detail


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3. Air Duct Insulation: Table 5: Duct Insulation Specification Schedule

Applicable scope Material Type Density Thickness

Supply air duct 48kg/m3 25mm

Return air duct Glasswool Blanket

48kg/m3 25mm

Smoke exhaust duct Rockwool Board 60kg/m3 50mm

Supply air chambers

and sound

attenuation fittings

Glasswool Blanket 48kg/m3 50mm

Figure 11: Possition of Sealant for Duct Seam

Figure 12: Typical smoke exhause duct insulation detail

Seam

Board insulation 50mm (see table 5)

Alu. Sheet Cladding (if any)

Metal clips

Air duct

Pin Φ1.6mm (see figure 15)

Adhesive

Attached Alu. Tape (Width 50mm)

Seal (Inside Only)

Air Duct

Seal


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(Non-flammable)

Metal clip

Alu. foil facing

Alu. sheet cladding

Rockwool for smoke exhaust ductGlasswool for AC duct

Air duct

`

Pin Φ1.6mm (see figure 15)

Figure 14: Insulation detail for supply air chambers and sound attenuation fitings

Figure 13: Ducting insulation layer detail

Pins Φ1.6mm (see figure 14)

Metal clips Air duct

Glasswool 25mm thk Glass cloth


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Max. 300mm

Max. 300mm

Figure 15: Shape & distance of pins

Metal clip

Pin Φ1.6mm

Insulated duct

Bare duct

Max. 300mm

Max. 300mm


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Figure 17: Detail of typical insulation for diffuser box

50mm

50mm

Figure 16: Typical insulation menthod for TDC joint & flange joint

Plan view

Ceiling

Glasswool 25mm thk (outside duct)

Aluminum tape 25mm


Glasswool 25mm thk (inside diffuser box)

Screw

Air flow Chamber box

Front view

TDC joint

25mm

Metal slip Glasswool 25mm thk

Attached alu. tape 25mm

25mm

Metal slip

Flange joint

Pin Φ 1.6mm

Attached alu. tape 25mm

TDC or Flange joint Glasswool 25mm thk Alu. Tape 50mm

25mm

50mm Attached alu. tape 25mm


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II. Air Devices Installation Works: 1. Volume Dampers (VD), Volume Control Dampers (VCD), Fire Damer (FD):

Table 6: Quantity of hanger rods for Fire Damper

Rectangular Duct Spiral Duct

Duct size or Diameter (mm) Less than 300 Over 300 Less than 300 Over 300

Quantity of hanger rods (nos) 2 4 2 4

Figure 19: Detail of setting damper

Figure 18: Detail of typical insulation for grille (VHS type)


WallScrew

Frame

Tapping

Air duct

TDC joint

Air flow

L = 8D D: diameter of air duct

Concrete foundation

L

D

Air Fan

VD

VD

Air duct

Concrete slab


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Anchor bolt

Concrete floor slab

Angle steel

Insulation 25mm

Branch duct

Rubber pad

Bolt M8

Wall

Fire damper

Vertical duct

Access door FD

Wall

Concrete floor slab

Fire damper

VCD Access door FD

V-Angle steel

Rockwool 50mm

Duct elbow

Insulation 25mm

V-Angle steel

Anchor bolt

Hanger rod

Vertical duct

Bolt M8

Figure 20: Typical damper installation detail

PLAN VIEW

FRONT VIEW


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2. Diffusers, Registers:

Ceiling

SUPPLY AIR CHAMBER BOX

Glasswool 25mm thk

Glass wool 25mm thkInsulation (outside)

Opposed blade damper


Insulation (inside)

(if any)

Figure 21: Example of connection with chamber & duct

Connection with chamber box

H, W: Dimension of Diffusers opening size for ceiling (mm)

d : Diameter of flexible duct (mm)

Flexible

K = 150 ~ 300mm

D＋50mm

Connection with Duct

Figure 22: Detail of typical installation for supply air diffuser

K

W×H

Ceiling

Air duct

W＋50mm

H＋50mm D

W×H

K Ceiling

Chamber box

D

Flexible

H＋50mm

100mm or over


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RETURN AIR CHAMBER BOX

Ceiling

Screw Glass wool 25mm thkInsulation (outside)

Glasswool 25mm thkInsulation (inside)

EXHAUST AIR CHAMBER BOX

Opposed blade damber

Ceiling

Screw

(if any)

3. Plenum Chamber, Silencer Chamber: Sound Absorber for Chamber shall be used glasswool 50mm thk, 48 kg/cm3 density.

Table 7: Galvanized steel sheet thickness for Chamber

Longest Dimension of Chamber (mm)

Chamber Size (L max) (mm) Less than 800 800 ~ 1500 1500 or Over

Steel Sheet Thickness (mm) 0.8 1.0 1.2

Figure 24: Detail of typical connection for exhause air grille

Figure 23: Detail of typical installation for return air grille


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Figure 25: Silencer Elbow Chamber Detail

Figure 26: Silencer Chamber Detail

Sound Absorber by glasswool 50mm thk

RA

L

A Silencer Elbow

A

B Silencer Chamber


Detail D

Detail E

Detail E

Pin Φ 1.6mm

GI sheet cover 0.6mm thk

25~50mm

Air Duct



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4. Flexible Duct, Canvas Joints a) Flexible Duct:

Bolt M6

AIR DUCTFLEXIBLE DUCT

Screw 3.2Ø

G.I.sheet 0.6mm thkSteel band

Ceiling

SUPPLY AIR CHAMBER BOX

Opposed blade damper


G.I.sheet 0.6mm thkSteel band


Insulation (outside)(if any)Glasswool 25mm thk

Figure 27: Chamber Jointing Detail

Figure 28: Detail of typical connection between flexible duct & chamber box

Detail D

Pin Φ1.6mm

100~150mm75mm

25~50mm



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b) Canvas Joints:

RETURN CHAMBER BOX

Ceiling Canvas

Flange joint (refer to detail G)Glasswool 25mm thk

Insulation (outside)


AIR DUCT

Screw

Figure 29: Canvas Joint Detail

Figure 30: Detail of typical connection between canvas & chamber box

L = 200 ~ 250 (mm)

Detail F

Galvanized steel sheet ( same as duct thickness)

Angle steel flange

Rubber gasket (width:5mm)

Cuff 5mm or more

Rivet 3.2mm

Bolt and nut M8

Canvas Joint

Washer

Air duct

LFlange joint

Air duct Air duct

Duct canvas Detail F


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5. Louver, Access door, Outdoor Hood:

a) Louver:

Figure 31: Typical Louver Installation Detail

Concrete slab

Louver Chamber box

Anchor bolt

Access door (see figure 32)

Hanger rod

Mortar Grout Anchor bolt

Wall

500mm Angle steel

(see table 3)


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b) Access door:

Sach lock

Air duct

Aluminium

Screw 3.2ØSteel plate

Steel plate

Sach lock

Aluminium

c) Outdoor Hood:

.

Figure 33: Typical Outdoor Hood Installation Detail

Chamber box

Outdoor hood

GI sheet cover 0.6 mm thk

Air duct

Wall

Insect Screen (if any)

Mortar

Sealant

Rockwool 60kg/m3

Screw

Figure 32: Typical Access Door Installation Detail

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MS for Ductwork System