Type 20 and Type 40

Direct Steam Injection (SI) Humidifiers

Description

Spirax Sarco direct steam injection (SI) humidifiers are designed to inject dry steam into a ducted air system in such a manner as to ensure efficient mixing of the steam and air, and to raise the moisture content of the air stream with no condensate carryover.

Available types
The SI systems are available in two versions – Type 20 and Type 40.
For each version there are a range of 13 standard length lances to cover duct widths from 280 mm to 3 950 mm.
The selection is dependent upon the steam humidification load.

Standard control options

– Pneumatic 0.2 – 1.0 bar
– Electric Valve motor drive 230 V, 100/110 V or 24 V
– Electronic 0 -10 V dc or 4-20 mA

Type 20 and Type 40 Direct Steam Injection (SI) Humidifiers

Technical details

Separator body design conditions	PN6
Maximum operating pressure	4 bar g
Maximum operating temperature	150 °C
Maximum recommended tracer circuit operating pressure	4 bar g
Minimum recommended tracer circuit operating pressure	1 bar g

Note: The assembly can be operated down to 0.35 bar g

Materials

Type 20 and Type 40 Direct Steam Injection (SI) Humidifiers

No.	Part		Material
1	Separator	Shell	Stainless steel	304 (S14/S11)*
		Internals	Stainless steel	304 S11*
2	Lance	Body	Stainless steel	BS 3146 ANC3B*
		Tracer tube	Stainless steel	304L*
		Main tube	Stainless steel	304L*
		End cap	Stainless steel	304 S11*
		Spring clips	Stainless steel	304 (S14/S11)*
3	Nozzles		Stainless steel	304 (S14/S11)*
4	Pipe fittings		Malleable iron*
5	Compression fittings		Bright zinc plated mild steel*
6	Pre-heat tracer pipe 8 mm O/D tube		Spirax Sarco or customer to supply
7	Name-plate		Aluminium
8	Actuator		See specific Technical Information sheet (TI) for Spirax Sarco actuators
9	Spirax Sarco valves		Refer to specific Technical Information sheet (TI) for material specification
	LE31 (screwed)		Cast iron
	LE33 (flanged)		Cast iron
	KE71 (screwed)		SG iron
	KE73 (flanged)		SG iron
	KE63 (flanged)		Stainless steel
10	Tracer system	MST21(E)	Stainless steel
11	Lance interconnecting pipework		Installer to supply
12	Escutcheon plates		Galvanised steel
13	Separator drain trap	FT14	SG iron	DIN 1639 GGG40