Spiral Duct - Spiral Ducts and Fittings

Spiral Duct

Spiral Duct

1. Application
The air duct is mainly used to connect the air circulation between two places and play the role of ventilation. The most widely used in the market is the spiral duct.
2. Type Identification Method
Duct Rd × L
For example: the duct with the 500mm diameter and the 6m lengths is identified as R500 × 6.
Pre-heat insulation duct: PRd × L
NOTE: (1). Normal: L=(max)400/each
(2). Insulation materials: mineral wool, rubber and plastic or glass fiber
(3). Thickness of insulation: δ=12.5mm δ=15mm or 25mm, unless otherwise stated, then δ=12.5mm.
3. Dimension Table

φd	Tolerance	t
100	100.0-100.5	0.5
125	125.0-125.5	0.5
160	160.0-160.6	0.5
200	200.0-200.7	0.5
250	250.0-250.8	0.5
315	315.0-315.9	0.5
400	400.0-401.0	0.6
500	500.0-501.1	0.75
630	630.0-631.2	0.75
800	800.0-801.6	0.75
1000	1000.0-1002.0	0.75
1250	1250.0-1252.5	1.00

NOTE: (1). Galvanized and stainless steel sheet materials can be selected for duct S304、S316.
(2). Material thickness is according to GB 50243-2002 or determined by customers.

4.Allowed maximum pressure under the standard atmosphere pressure［pa］

L m	Φd mm	t=0.5 mm		t=0.6 mm		t=0.7 mm		t=0.9 mm
L m	Φd mm	Standard	Strengthen	Standard	Strengthen	Standard	Strengthen	Standard	Strengthen
6	100	21000		36300				42000
	125	15000		25900		38000		35000
	160	8300		18000		31000		27000
	200	5000		14500		23000		20000
	250	2300	5000	7000	16000	17500	21000	15300	23000
	315			2000	10500	10000	14000	10200	21000
	400				4500	6000	9000		12100
	500				3000		5500		7200
	630						3900		6000
3	800						1500		2600
	1000								1000
	1250								800

Note: Pressure drop chart are only for reference in this catalogue.

5. Drawing

Spiral Duct