CAMCORP SWF with Externally Mounted Fan User Manual
Page 17
P
R O D U C T
H
I G H L I G H T
B
EADED
S
NAPBAND
F
ILTER
B
AG
D
ESIGN FOR
F
LAT
T
UBESHEET
H
OLE
The snapband was developed to improve sealing efficiency. This design eliminates multiple parts, minimizing labor
expenses.
Camcorp provides a uniform double beaded gasket in the cuff assembly. This assures a leakproof seal for flat
plate tubesheet holes. When installing the bags, follow instructions provided.
P
ROPER
I
NSTALLATION OF THE
C
UFF
1. Form the snapband into the shape of a kidney.
The vertical seam in the cuff should be on the
outer radius of the kidney shape.
2. Seat the seam of the cuff into the hole first with
the tubesheet fitting between the beads, with
one above and one below it .
3. Release the band and it will spring securely into
place. Use caution, and ensure all fingers are
out of the tubesheet opening when the snap-
band is released. Make sure the snapband fits
squarely in the hole and there are no kinks in
the metal band.
NOTE:
If you are converting to a snapband bag from some other type of sealing method, the tubesheet holes must
be inspected carefully to ensure that proper sealing will result. The surface finish on the inside diameter must be
relatively smooth. Any deep grooves or protrusions will cause leakage. A hole that was flame cut, but not ground
smooth is one example. The tubesheet holes must be consistent in circumference from one hole to another.
If the circumference difference is determined by measuring, the holes should be checked to the nearest 0.001 in.
Slight out-of-roundness is acceptable. Take three measurements for each hole and record the average of these three
measurements. Compare all the hole averages. The difference between the largest average and smallest average hole
size should not exceed 0.020 in. Try sample cuff in largest and smallest hole to confirm proper fit.
When checking the sample snapband in the hole for fit, push on the edge of the snapband slightly with your thumb
to try and move it inward. If a gap occurs easily between the snapband and the edge of the tubesheet hole, leakage
may result. If the inside surface of the hole is smooth, check the cuff fit by trying to spin the cuff in the hole. If it
spins easily, it may leak.
Flat Plate Tubesheet Hole
Snapband
Top View
Seam