Conn Blade Mounting Considerations - Clear Area

Beyond impeller bore configurations, with the Conn styles as well as other louvered or vented styles open area in the center of the impeller must also be considered.  Typically, reinforcing discs, taper plates, sandwhich the blade to stiffen the disperser disc.  Due to the louver placement on the conn blade, the size of these disks, and with small sizes - the diameter of the mounting hub, must be considered. 

The below table gives approximate dimensions of the CONN Blade styles IT and ITT.  The Clear Diameter (yellow column) defines the diameter of a circle clear of obstruction.  The clear diameter represents the largest taper plate or hub a given size impeller can handle. 

CONN Blade Measurements Intensive Type (IT)  and Intensive Type with Teeth (ITT) 

CONN Blade Styles			CONN - IT Blade			CONN - ITT Blade
Size	Clear Diameter		Diameter	Material Thickness		Diameter	Material Thickness
2			2 ⅟16	0.032		2⅜	0.032
3			3⅛	0.062		3⅜	0.062
4			4	0.078		4⅜	0.078
5			5½	0.078		6	0.078
6			6⅝	0.078		7¼	0.103
7			7½	0.078		8	0.130
8			8¾	0.078		9¼	0.103
9			N/A	0.103		10⅜	0.103
10			10¾	0.103		11½	0.103
11			11½	0.103		12½	0.103
12			12½	0.103		13⅝	0.135
13			13⅝	0.135		14⅞	0.135
14			14¾	0.135		16	0.180
16			16¾	0.180		18¼	0.180
18			19	0.180		20¾	0.180
20			20¼	0.180		22	0.180
22			22½	0.180		24½	0.180
24			24¾	0.180		27	0.180
26			27¼	0.180		29½	0.180
28			29½	0.180		32	0.180
30			31½	0.180		34¼	0.180
32			33½	0.180		36	0.180
34			35½	0.180		38	0.180
36			37½	0.180		40	0.180
38			39½	0.180		42	0.180
40			41½	0.180		44	0.180
42			43½	0.180		46	0.180
44			45½	0.180		48	0.180

For Example:  It is generally recommended to use taper plates, Reinforcing disks. approximately ⅔ the impeller diameter.  However due to the louvers in th Conn Blade, the largest taper plates that can be used with a Size 12 - CONN Style is 5". 

* Because of this the impellers are made of heavier gage material to provide their own stiffness. 

Even more CRITICAL:   Due to the limited clear area on the CONN styles, the smallest impeller that can be installed on some standard Hub mount disperser, (i.e. Cowles, Myers) is limited due to diameter of the mounting hub.  A typical Myers 775-15, 15 HP disperser has a mounting hub of approximately 3¼".  This would require a size 7 and larger CONN Blade. 

Click the links below for more information

• Conn IT - Intensive Type
• Conn ITT- Intensive Type with Teeth
• Conn ITC - Intensive Type Cutter

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