Graco 262960, Instructions Manual

Page: 13 / 68

Installation
3A7467D 13
Blast Hose Control Selection
Make sure to use the correct type of blast control. Either
an electric or pneumatic blast control switch can be
used with hose lengths less than 150 ft (45 m). Blasting
with 150 ft (45 m) or more of blast hose requires the use
of an electric blast control switch.
Blasting on Higher Surfaces
For example: When blasting 50 feet (15 m) straight up,
use at least 10 feet (3 m) of blast hose on the ground
before the blast hose goes up to the blasting height.
Pinch Hose Inspection
Inspect the pinch hose at the start of each job looking
for “bubbles” in the outer casing. If bubbles in the casing
are found, replace the pinch hose (see
Replace the
Pinch Hose , page 37). Keep a spare pinch hose on the
job site in case of failure. See Vapor Abrasive Blast
Systems and Accessories , page 56.
NOTE: There are three main factors that can affect
(diminish) the life of the pinch hose: abrasive media
used (course/sharp), blast control switch trigger rate
(high), and the air inlet pressure to the system (high). If
your setup reflects one or more of these factors, inspect
the pinch hose at the start of each job, and weekly
thereafter for signs of failure (bubbling).
NOTICE
When blasting on a surface higher than the
equipment, make sure that there is a length of blast
hose on the ground equal to 10-20% of the height.
The hose on the ground prevents unspent abrasive in
the hose from backing up into the internal plumbing of
the panel, which can cause damage to the main air
regulator when the blast switch is disengaged.
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