Technical data

Examples of Incorrect Electrofusion Joints
The most common cause of joint failure for an electrofusion fitting falls
into a category of failure classified as improper pipe preparation. Most
issues associated with improper pipe preparation can be controlled by
the installer and with adherence to proper installation techniques.
Improper pipe preparation is avoidable .
NO PIPE SCRAPING
The radial depressions are created by
the wire-heating element of the fitting and
indicate that the fitting achieved the
proper temperature for fusion. This pipe
section has many grooves and scratches
from its insertion into a steel main.
These defects along with the dirt that
has been melted into the surface make
it apparent that no scraping or other
pipe preparation was done.
PIPE OVER-SCRAPED
The complete removal of the co-extruded
stripes on this pipe indicates that more than
.060 of an inch was removed from the out-
side diameter of the pipe. This required 12
– 15 passes with a rotary scraper. Remov-
ing this much material from the pipe cre-
ates a gap between the pipe and fitting that
is too great to seal during the fusion pro-
cess.
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