Flowserve Guardian Sealless Metallic - Manual (Page 33)

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11
Page 33 of 68 flowserve.com
Flowserve coupling guards are safety devices intended
to protect workers from inherent dangers of the rotating
pump shaft, motor shaft and coupling. It is intended to
prevent entry of hands, fingers or other body parts into a
point of hazard by reaching through, over, under or
around the guard. No standard coupling guard provides
complete protection from a disintegrating coupling.
Flowserve cannot guarantee their guards will completely
contain an exploding coupling.
The coupling guard shown in Figure 5-8 conforms to
the USA standard ASME B15.1,
“Safety Standard for
Mechanical Power Transmission Apparatus.”
Flowserve manufacturing facilities worldwide conform
to local coupling guard regulations.
5.5.2
ClearGuard™ - option
Flowserve offers as an option a ClearGuard™, which
allows you to see the condition of the coupling. (See
Figure 5-9.) This guard can be used in place of the
existing clamshell guard described above. The
following instructions enable the user to properly fit
this guard to the pump and motor.
Figure 5-9: ClearGuard™
5.5.2.1 Trimming and assembly instructions
In order to correctly fit the pump/motor configuration,
each ClearGuard must be trimmed to a specific
length. This trimming is done on the motor end of the
guard as described below. (See Figure 5-10.)
Figure 5-10: ClearGuard™ trimming
5.5.2.2 Trimming instructions
a) Measure minimum distance from the center of
mounting hole in the baseplate to the motor at
diameter as shown above.
b) Locate a reference center of the slot in the coupling
guard flange. Transfer measurement from Step a)
to the guard using this reference center.
c) Trim the motor end of guard according to the
above measurement. Trimming is best done with
a band saw, but most other types of manual or
power saws give acceptable results. Care must
be taken to ensure that there is no gap larger
than 6 mm (0.24 in.) between the motor and the
coupling guard.
d) Note: If motor diameter is smaller than guard
diameter, trim guard so that it extends over the
end of the motor as far as possible.
e) Deburr the trimmed end with a file or a sharp knife.
Care must be taken to eliminate all sharp edges.
5.5.2.3
Assembly instructions
f) Place the bottom and top halves of the
ClearGuard around the coupling.
g) Install the support legs by inserting and then
rotating the top flange of the leg through the slot
in the shell flange until it comes all the way
through and locks the top and bottom together.
h) Attach the support legs to the baseplate using the
fasteners and washers provided.
i) Install fasteners in the holes provided to secure
the guard flanges together.
5.6 Priming and auxiliary supplies
The standard Guardian G & H series pumps will not
move liquid unless the pump is primed. A pump is
said to be “primed” when the casing and the suction
piping are completely filled with liquid. Open
discharge valves a slight amount. This will allow any
entrapped air to escape and will normally allow the
pump to prime, if the suction source is above the
pump. When a condition exists where the suction
pressure may drop below the pump’s capability, it is
advisable to add a low-pressure control device to
shut the pump down when the pressure drops below
a predetermined minimum.
The Guardian Unitized self-priming centrifugal pumps
have a slightly different requirement regarding
priming. The initial priming liquid must be added to
the pump casing until the liquid has reached the
bottom of the suction nozzle. Once the initial prime is
in place, the pump will automatically replenish itself
and additional priming liquids are not normally
needed. If liquid is lost, additional priming liquid may
be needed.