PIPE-PRO XL™ INTERNAL-PIPE BLAST TOOL
Page 4
© 2017 CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 27804 Rev A
3.2
Nozzle Stand-Off-Distance Tables
The stand-off distance is the distance from the exit end
of the nozzle to the inside surface (diameter) of the pipe.
3.2.1
For 16" to 31" Pipe
3.2.1.1
The table in Figure 4 shows the approximate
stand-off distances of short and long venturi nozzles
when blasting pipe diameters between 16" and 31".
3.2.2
For 32" to 60" Pipe
3.2.2.1
The table in Figure 5 is a quick view of
approximate stand-off distance for nozzles and nozzle
extensions when blasting 32" to 60" pipe. When more
precision is needed refer to Figure 6 to calculate nozzle
stand-off distances.
3.2.3
The nozzles and stand-off distances shown are
only guidelines to assist the user in choosing nozzle type
and orifice diameter; it does not show the nozzle to use
with a given pipe diameter. Usually the minimum stand-
off distance is about four inches; maximum distance is
generally between 8" and 16" but depends on nozzle
orifice size (usually determined by the volume of
compressed air available), nozzle pressure, surface
condition, and degree of cleaning required.
NOZZLE STAND-OFF-DISTANCE
FOR 16" to 31" ID PIPE
PIPE
SHORT
LONG VENTURI NOZZLE
INSIDE VENTURI
1/4"
5/16" 3/8"
DIAMETER NOZZLE Orifice
Orifice
Orifice
16" 3-3/4"
1-3/4"
1-1/4"
N/A
17" 4-1/4"
2-1/4" 1-3/"4 3/4"
18" 4-3/4"
2-3/4" 2-1/4" 1-1/4"
19" 5-1/2"
3-1/4"
3"
2"
20" 6"
4"
3-1/2"
2-1/2"
21" 6-1/2"
4-1/5"
4"
3"
22" 7"
5"
4-3/4"
3-3/4"
23" 7-3/4"
5-1/2" 5-1/4" 4-1/4"
24" 8-1/4"
6-1/2" 5-3/4" 4-3/4"
25" 9"
6-3/4"
6-1/2"
5-1/2"
26" 9-1/2"
7-1/2"
7"
6"
27" 10"
8"
7-1/2"
6-1/2"
28" 10-1/2"
8-1/2"
8"
7"
29" 11-1//4"
9"
8-3/4"
7-3/4"
30" 11-3/4"
9-3/4" 9-1/4" 8-1/4"
31" 12-3/4"
10-1/4" 9-3/4" 8-3/4"
Figure 4
NOZZLE STAND-OFF DISTANCE for 32" TO 60" ID pipe
LONG VENTURI NOZZLE
PIPE INSIDE
SHORT
1/4"
5/16"
3/8"
DIAMETER VENTURI
NOZZLE Orifice Orifice Orifice
32" to 36" W/O Extensions
13" to 15-1/4"
10-3/4" to 13"
10-1/2" to 12-3/4"
9-1/2" to 11-3/4"
32" to 36" W/6" Extensions
7" to 9-1/2"
4-3/4" to 7"
4-1/2" to 6-3/4
N/A
37" to 47" W/6" Extensions
9-3/4" to 15-1/2"
7-3/4" to 13-1/5"
7-1/4" to 13"
6-1/4" to 12"
48" to 60" W/12" Extensions
10" to 17"
8" to 15"
7-3/4" to 14-3/4"
6-3/4" to 13-3/4"
53" to 60" W/18" Extensions
7" to 11"
5" to 9"
4-1/2" to 8-3/4
3-1/2" to 7-3/4"
Figure 5
FORMULA TO CALCULATE NOZZLE STAND-OFF
FOR 32" to 60" PIPE
NOZZLE TYPE
BASE DIMENSION
@ 32” DIA. PIPE
Short Venturi
13 Inches
1/4" Orifice Long Venturi
11 Inches
5/16" Orifice Long Venturi
10-1/2 Inches
3/8" Orifice Long Venturi
9-1/2
Inches
To obtain stand-off distance for pipe larger than 32", add
0.58" for every inch over 32 and subtract length of nozzle
extension.
For example, to calculate the stand-off distance of a 48
inch diameter pipe when using a No. 5 long venturi nozzle
Subtract 32" from 48" = 16"
Multiply 0.58" x 16 = 9.28 (9-1/4")
Add 9-1/4" to No. 5 base dim. (9.1/4 + 10-1/2" = 19-3/4")
The stand-off distance is approximately 19-3/4".
When using a nozzle extension subtract the length of the
extension. In the case of the example:
Subtract 6" for a 6" extension (19-3/4" - 6" = 13-3/4"
stand-off).
Subtract 12" for a 12" extension (19-3/4" - 12" = 7-3/4"
stand-off).
Figure 6
