SANDPIPER RHDF2 Hazardous Duty - Manual (Page 34)

rhdf2dl1sm_haz duty-rev0614 Model RHDF2 Hazardous Duty Page 32
CONVERTED EXHAUST ILLUSTRATION
SAFE AIR
EXHAUST
DISPOSAL
AREA
PUMP INSTALLATION AREA
1" DIAMETER AIR
EXHAUST PIPING
1" DIAMETER AIR
EXHAUST PIPING
MUFFLER
LIQUID
LEVEL
SUCTION
LINE
MUFFLER
Illustration #1
Illustration #2
PUMPING HAZARDOUS LIQUIDS
• When a diaphragm fails, the pumped liquid or fumes enter the air end of the pump. Fumes
are exhausted into the surrounding environment. When pumping hazardous or toxic
materials, the exhaust air must be piped to an appropriate area for safe disposal. See
illustration #1 at right.
• Piping used for the air exhaust must not be smaller than 1" (2.54 cm) diameter. Reducing
the pipe size will restrict air flow and reduce pump performance. When the pumped
product source is at a higher level than the pump (flooded suction condition), pipe the
exhaust higher than the product source to prevent siphoning spills. See illustration #2 at
right.
CONVERTING THE PUMP FOR PIPING THE EXHAUST AIR
• The following steps are necessary to convert the pump to pipe the exhaust air away from
the pump.
• Remove the muffler. The air distribution valve has 1" NPT threads for piped exhaust.
IMPORTANT INSTALLATION NOTE:
• The manufacturer recommends installing a flexible conductive hose or connection
between the pump and any rigid plumbing. This reduces stresses on the molded threads
of the air exhaust port. Failure to do so may result in damage to the air distribution valve
body.
• Failure to support these connections could also result in damage to the air distribution
valve body.