Graymills DDP .375' Pump OMI - Manual (Page 6)

6
Installation
Grounding
FIRE AND EXPLOSION HAZARD
This pump must be grounded. Before oper-
ating the pump, ground the system as
explained at right. Also read the section
FIRE AND EXPLOSION HAZARD on
page 3.
The polypropylene pump is not conductive.
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. 5 through Fig. 7). Never use a polypropylene pump
with non-conductive flammable fluids as specified 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.
WARNING
To reduce the risk of static sparking, ground the pump and
all other equipment used or located in the pumping area.
Check your local electrical code for detailed grounding
instructions for your area and type of equipment.
Ground all of this equipment:
D Pump: Attach a ground wire (Y) to the grounding strip
(112) with the screw (28), lockwasher (29) and nut (27),
as shown in Fig. 1. Connect the clamp end of the
ground wire to a true earth ground.
NOTE: When pumping conductive flammable fluids with
a polypropylene pump, always ground the fluid system. See
the WARNING at left. Fig. 5 through Fig. 7 show recom-
mended methods of grounding flammable fluid containers
during filling.
Fig. 1
Y
112
27
29
28
01432B
D Air and fluid hoses: Use only electrically conductive
hoses.
D Air compressor: Follow the manufacturer’s recommen-
dations.
D Solvent pails used when flushing: Follow your local
code. Use only metal pails, which are conductive. 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 your local code.