MS for Ductwork System

Saigon M&C Tower Project Method Statement For Ductworks

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

C.T.P N.A.K L.Q.K J.R.P

FIRST ISSUE

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Saigon M&C Tower Project Method Statement For Ductworks

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 Largest Dimension (mm) Duct Size (L max)

Up to 400

Steel Sheet Thickness

0.5

600

800 ~ 1250

1600 ~ 2500

Above 2500

0.8

1.0

1.2

0.6

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

Companion Angle Duct

C , TDC

NA

TDC

NA

NA

Flange-40x40x3.0mm

NA

Flange-40x40x4.0mm

Less than 600 (mm) Duct size 601 to 1500 (mm) largest dimension 1501 to 2500 (mm) (mm) Over 2500 (mm) Maximum Spacing (mm)

1100

1200

Size of Bolt & Nut (mm)

8 mm

8 mm

Diameter (mm)

3.2 mm

3.2 mm

Maximum Spacing on Center (mm)

65 mm

65 mm

Rivet

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Saigon M&C Tower Project Method Statement For Ductworks

Table 3: Support, hanger, spacing schedule Less than

Duct size

Hanger

Vertical support

400

400 ~ 999

1000 ~1999

2000 ~ 2500

Over 2500

V-

U-

50x50x3.5

80x38x3.5

2 x Φ10

2 x Φ10

2 x Φ12

3000

2500

2500

2500

V30x30x2.5

V-40x40x3

V-

U-

50x50x3.5

80x38x3.5

Angle steel

V-30x30x2.5

V30x30x2.5

V-40x40x3

Round bar

2 x Φ8

2 x Φ10

Max. pitch L

3000

Angle steel

V-30x30x2.5

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: Concrete slab

Anchor bolt

Hanger rod M10 Air flow

Air flow

Air Duct W

Angle steel (see table 3) L ≤ 1200

Detail A

Figure 01: Typical duct connection detail (using flange joint) ) Detail A show be as Figure 02, Figure 03: 100

100

100 Angle steel flange (see table 02)

Sealed Bolt hole 8mm

Figure 02: Detail of bolt spacing for flange joint Page 4

Saigon M&C Tower Project Method Statement For Ductworks

5mm thk Washer

Rubber gasket Width: 25mm, 5mm thk

Bolt & Nut 8mm

Rivet 3.2mm

Air Duct

Angle steel flange (see table 02) Figure 03: Detail of connection angle for flange

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

Main duct Change between section Detail B

L W

Branch duct

L = 0.25W; L≥150mm

Air flow Figure 4: Branch duct connection detail (using Transverse Duct Connector (TDC) joint) ) Detail B show be as Figure 05, Figure 06, Figure 07 Cross aim brace

C

B

C

A

4 hole Φ10

A

C

B

C

Air duct

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

Figure 05: Detail of Cross Aim Brace Spacing Page 5

Saigon M&C Tower Project Method Statement For Ductworks

Cross Aim Brace (see table 4)

Rubber gasket (see figure 08) TDC Corner (see table 4)

Air Duct

Figure 06: Cross Aim Brace detail 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

1.0

1.0

1.0

1100

1100

1100

Thickness of Cross Arm Brace (minimum)(mm) Maximum Spacing (mm)

TDC joint Corner plate (see detail)

Air duct

Max 1100 TDC flange Bolt M10 TDC corner 1.2mm thk TDC duct end (see table 4) Nut M10 Rubber gasket (see figure 08) Nut M10

Bolt M10 Rubber gasket (see figure 08)

Figure 07: Typical TDC assembly detail Page 6

Saigon M&C Tower Project Method Statement For Ductworks

Rubber gasket Width: 25mm Thickness: 5mm

15-20mm

Bolt hole 8mm Figure 08: Typical rubber gasket installation detail ) 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: Bolt hole 10mm TDC joint

Seal

Air Duct

50

Figure 09: Position of Seal for TDC Joint Seal Angle flange joint

Bolt hole 8mm 50

Air Duct

Figure 10: Possition of Seal for Angle Flange Joint Page 7

Saigon M&C Tower Project Method Statement For Ductworks

Seal (Inside Only)

Seal Air Duct

Figure 11: Possition of Sealant for Duct Seam 3. Air Duct Insulation: Table 5: Duct Insulation Specification Schedule Applicable scope Supply air duct Return air duct Smoke exhaust duct

Material

Type

Density

Thickness

Glasswool

Blanket

48kg/m3

25mm

48kg/m3

25mm

Rockwool

Board

60kg/m3

50mm

Glasswool

Blanket

48kg/m3

50mm

Supply air chambers and sound attenuation fittings Attached Alu. Tape (Width 50mm)

Board insulation 50mm (see table 5)

Seam

Pin Φ1.6mm (see figure 15)

Alu. Sheet Cladding (if any)

Air duct Metal clips

Adhesive

Figure 12: Typical smoke exhause duct insulation detail Page 8

Saigon M&C Tower Project Method Statement For Ductworks

Alu. foil facing Metal clip

Air

du

Alu. sheet cladding (Non-flammable)

ct

Glasswool for AC duct Rockwool for smoke exhaust duct

Pin Φ1.6mm (see figure 15) Figure 13: Ducting insulation layer detail

Glasswool 25mm thk

Glass cloth

Metal clips

Air duct Pins Φ1.6mm (see figure 14) `

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

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Saigon M&C Tower Project Method Statement For Ductworks

Max. 300mm

Max. 300mm

Pin Φ1.6mm Metal clip

Insulated duct

Bare duct Max. 300mm Max. 300mm

Figure 15: Shape & distance of pins

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Saigon M&C Tower Project Method Statement For Ductworks

Front view Pin Φ 1.6mm 50mm 25mm Flange joint Metal slip Glasswool 25mm thk 50mm 25mm Attached alu. tape 25mm

Glasswool 25mm thk

TDC joint Alu. Tape 50mm

TDC or Flange joint

25mm Attached alu. tape 25mm

50mm

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

Glasswool 25mm thk (inside diffuser box)

Glasswool 25mm thk (outside duct) Chamber box

Air flow

Screw Glasswool 25mm thk (outside duct)

Aluminum tape 25mm

Ceiling

Figure 17: Detail of typical insulation for diffuser box Metal slip

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Attached alu. tape 25mm

Saigon M&C Tower Project Method Statement For Ductworks

Wall

Screw

Air duct

Frame

Glasswool 25mm thk (outside duct)

Tapping

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

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

VD Air flow

D

Air duct

L

VD

L = 8D D: diameter of air duct Air Fan Concrete slab

Concrete foundation

Figure 19: Detail of setting damper 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

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Saigon M&C Tower Project Method Statement For Ductworks

Branch duct

Access door FD Concrete floor slab

Fire damper Wall

Anchor bolt Angle steel Bolt M8

Rubber pad

Vertical duct

Insulation 25mm

PLAN VIEW

Anchor bolt

Wall

Rockwool 50mm Concrete floor slab

V-Angle steel Bolt M8

Hanger rod

Fire damper Insulation 25mm

Vertical duct VCD

Access door FD

Duct elbow

V-Angle steel

FRONT VIEW Figure 20: Typical damper installation detail Page 13

Saigon M&C Tower Project Method Statement For Ductworks

2. Diffusers, Registers: Connection with Duct

Connection with chamber box

H＋50mm

D

H＋50mm

Flexible 100mm or over

W＋50mm Flexible

Chamber box D

D＋50mm K

Ceiling

Air duct K

Ceiling

W×H K = 150 ~ 300mm

W×H H, W: Dimension of Diffusers opening size for ceiling (mm) d : Diameter of flexible duct (mm)

Figure 21: Example of connection with chamber & duct

SUPPLY AIR CHAMBER BOX

Insulation (inside) Glasswool 25mm thk

Insulation (outside) Glass wool 25mm thk

Opposed blade damper (if any)

Insulation (outside) Glass wool 25mm thk

Ceiling

Figure 22: Detail of typical installation for supply air diffuser Page 14

Saigon M&C Tower Project Method Statement For Ductworks

Insulation (inside) Glasswool 25mm thk

RETURN AIR CHAMBER BOX

Insulation (outside) Glass wool 25mm thk

Screw Ceiling

Figure 23: Detail of typical installation for return air grille

EXHAUST AIR CHAMBER BOX

Opposed blade damber (if any) Screw Ceiling

Figure 24: Detail of typical connection for exhause air grille

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

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Saigon M&C Tower Project Method Statement For Ductworks

A

Sound Absorber by glasswool 50mm thk

Silencer Elbow

R A L Figure 25: Silencer Elbow Chamber Detail

Sound Absorber by glasswool 50mm thk

B

Silencer Chamber

Detail D Detail E

A

Figure 26: Silencer Chamber Detail

Detail E GI sheet cover 0.6mm thk

25~50mm Air Duct

Pin Φ 1.6mm

Sound Absorber by glasswool 50mm thk

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Saigon M&C Tower Project Method Statement For Ductworks

Detail D Sound Absorber by glasswool 50mm thk Pin Φ1.6mm

25~50mm

75mm 100~150mm Figure 27: Chamber Jointing Detail

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

Insulation (inside) Glasswool 25mm thk

Steel band G.I.sheet 0.6mm thk

Bolt M6

FLEXIBLE DUCT

AIR DUCT

SUPPLY AIR CHAMBER BOX

Steel band G.I.sheet 0.6mm thk Insulation (outside) Glasswool 25mm thk

Screw 3.2Ø

Opposed blade damper (if any) Insulation (outside) Glass wool 50mm thk

Ceiling

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

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Saigon M&C Tower Project Method Statement For Ductworks

b) Canvas Joints: Duct canvas

Detail F

Air duct

Air duct

L

Flange joint

L = 200 ~ 250 (mm)

Figure 29: Canvas Joint Detail

Detail F Rubber gasket (width:5mm) Angle steel flange

Washer

Bolt and nut M8 Rivet 3.2mm

Air duct

Canvas Joint Cuff 5mm or more

Galvanized steel sheet ( same as duct thickness)

Insulation (inside) Glasswool 25mm thk

RETURN CHAMBER BOX

Insulation (outside) Glasswool 25mm thk

AIR DUCT

Screw

Flange joint (refer to detail G) Canvas

Ceiling

Figure 30: Detail of typical connection between canvas & chamber box Page 18

Saigon M&C Tower Project Method Statement For Ductworks

5. Louver, Access door, Outdoor Hood: a) Louver:

Concrete slab Wall

Anchor bolt

Mortar Grout

Louver

Hanger rod

Chamber box 500mm

Anchor bolt

Access door (see figure 32)

Figure 31: Typical Louver Installation Detail

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Angle steel (see table 3)

Saigon M&C Tower Project Method Statement For Ductworks

b) Access door: Steel plate Screw 3.2Ø

Air duct Sach lock

Aluminium

Aluminium

Steel plate

Sach lock

Figure 32: Typical Access Door Installation Detail

c) Outdoor Hood:

Mortar Wall Sealant Rockwool 60kg/m3 Outdoor hood Screw Air duct Insect Screen (if any)

Chamber box

GI sheet cover 0.6 mm thk

. Figure 33: Typical Outdoor Hood Installation Detail Page 20