Graymills DDP 1' Pump OMI - Manual (Page 5)

5
Grounding
WARNING
FIRE AND EXPLOSION HAZARD
This pump must be grounded. Before
operating the pump, ground the system
as explained below. Also read the sec-
tion FIRE AND EXPLOSION HAZARD
on page 3.
The polypropylene pump is not conductive. Attaching
the ground wire to the grounding strip will ground only
the air motor. When pumping conductive flammable
fluids, always ground the entire fluid system by making
sure the fluid system has an electrical path to a true
earth ground (see Fig. 2). Never use a polypropylene
pump with non-conductive flammable fluids as speci-
fied by your local fire protection code.
US Code (NFPA 77 Static Electricity) recommends a
conductivity greater than 50 x 10
–12 Siemans/meter
(mhos/meter) over your operating temperature range to
reduce the hazard of fire. Consult your fluid supplier to
determine the conductivity or resistivity of your fluid.
The resistivity must be less than 2 x 10
12 ohm-centime-
ters.
NOTE: When pumping conductive flammable fluids with
a polypropylene pump, always ground the fluid system. See
the WARNING above. Fig. 2 shows a recommended
method of grounding flammable fluid containers during
filling. This is only a guide; call Graymills for assistance in
grounding your system.
Ground all of this equipment:
D Pump: Connect a ground wire and clamp as shown in
Fig. 1. Loosen the grounding lug locknut (W) and
washer (X). Insert one end of a 12 ga (1.5 mm
@) mini-
mum ground wire (Y) into the slot in the lug (Z) and
tighten the locknut securely. Connect the clamp end of
the ground wire to a true earth ground.
Figure 1
Y
W
X
Z
02646
D Air and fluid hoses: Use only grounded hoses with a
maximum of 500 ft (150 m) combined hose length to
ensure grounding continuity.
D Air compressor: Follow the manufacturer’s recommen-
dations.
D All solvent pails used when flushing: Follow the local
code. Use only grounded metal pails, which are conduc-
tive. Do not place the pail on a non-conductive surface,
such as paper or cardboard, which interrupts the
grounding continuity.
D Fluid supply container: Follow the local code.