MS for ductwork system

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

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

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

Duct size

largest

dimension

(mm)

Rivet Maximum Spacing on

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

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

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

V-50x50x3.5

U-80x38x3.5

Vertical

support

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

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

B

C

A

4 holeΦ10

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

Width: 25mm, 5mm thk

Air Duct

Angle steel flange (see table 02) Bolt & Nut 8mm

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

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

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

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

Rubber gasket (see figure 08)

Rubber gasket (see figure 08)

Figure 07: Typical TDC assembly detail

Air duct

Corner plate

(see detail)

TDC joint

) 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

Figure 08: Typical rubber gasket installation detail

3 Air Duct Insulation:

Table 5: Duct Insulation Specification Schedule

Supply air chambers

and sound

attenuation fittings

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

Metal clip Alu foil facing

Alu sheet cladding

Rockwool for smoke exhaust duct Glasswool 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

Max 300mm Max 300mm

Figure 15: Shape & distance of pins

Metal clip Pin Φ1.6mm

Insulated duct

Bare duct Max 300mm

Max 300mm

Page 11 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 (outside duct) 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

Flange joint

Pin Φ 1.6mm

Attached alu tape 25mm

TDC or Flange joint

25mm

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

Figure 19: Detail of setting damper

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

Glasswool 25mm thk (outside duct)

Wall Screw

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

Anchor bolt Concrete floor slab

Angle steel

Insulation 25mm Rubber pad

Bolt M8

Wall Fire damper

Vertical duct

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

2 Diffusers, Registers:

Ceiling

SUPPLY AIR CHAMBER BOX

Glasswool 25mm thk

Glass wool 25mm thk

Insulation (outside) Opposed blade damper

Glass wool 25mm thk Insulation (outside)

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

RETURN AIR CHAMBER BOX

Ceiling

Screw Glass wool 25mm thkInsulation (outside)

Glasswool 25mm thk Insulation (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

Figure 24: Detail of typical connection for exhause air grille Figure 23: Detail of typical installation for return air grille

Figure 25: Silencer Elbow Chamber Detail

Figure 26: Silencer Chamber Detail

Sound Absorber by glasswool 50mm thk

R

A

L

A

Silencer Elbow

A

B

Silencer Chamber

Sound Absorber by glasswool 50mm thk

Detail D

Detail E

Detail E

Pin Φ 1.6mm

GI sheet cover 0.6mm thk 25~50mm

Air Duct

Sound Absorber by glasswool 50mm thk

4 Flexible Duct, Canvas Joints

a) Flexible Duct:

Bolt M6

AIR DUCT FLEXIBLE DUCT

Screw 3.2Ø

G.I.sheet 0.6mm thk Steel band

Ceiling

SUPPLY AIR CHAMBER BOX

Opposed blade damper Glass wool 50mm thk Insulation (outside) G.I.sheet 0.6mm thkSteel band

Glasswool 25mm thk Insulation (inside)

Insulation (outside)

(if any) Glasswool 25mm thk

Figure 27: Chamber Jointing Detail

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

PinΦ1.6mm

100~150mm 75mm

25~50mm

Sound Absorber by glasswool 50mm thk

b) Canvas Joints:

RETURN CHAMBER BOX

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

Insulation (outside)

Glasswool 25mm thk Insulation (inside)

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

L Flange joint

Air duct Air duct

Duct canvas

Detail F

5 Louver, Access door, Outdoor Hood:

a) Louver:

Figure 31: Typical Louver Installation Detail

Concrete slab

box

Anchor bolt

Access door (see figure 32)

Hanger rod

Wall

500mm

Angle steel (see table 3)

b) Access door:

Sach lock Air duct

Aluminium

Screw 3.2Ø Steel 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