Van Air Systems Mist Eliminator User Manual

Page 5

PRINTED IN THE U.S.A.

PAGE 5

SECTION 4

INSTALLATION

4.6 DRAIN LINE COMPONENTS

IMPORTANT

The drain solution may contain lubricants. Comply with all
applicable regulations concerning the discharge or disposal of
these chemicals.

The vessel was equipped with a manual drain valve on the drain line.
The vessel will require periodic draining to remove the accumulated
liquid from the sump area.

The drain solution from this vessel might contain lubricants and
chemicals that require special handling. Make sure that all applica-
tions and procedures are complied with concerning the chemicals in
the drain solution.

4.6-1 INSTALLING AN AUTOMATIC DRAIN VALVE

The installation of an electronic or demand drain valve will ensure
that the vessel is properly drained without attendance.

Install the electronic or demand drain valve on the drain line
following all instructions provided with the valve. Leave the
manual drain valve on the drain line. This valve will allow the drain
line to be shutoff if the automatic valve should require removal. If
the manual valve is left in the piping, make sure that it is left in the
open position during operation.

The following drain valves are available for installation on the MIST
ELIMINATOR:

Electronic drain valves:

Model EDV-2002 (1/2", 115V) ................ p/n 39-10105
Model EDV-2002 (1/2", 230V) ............... p/n 39-10106

Demand drain valve:

Model AS-120 ......................................... p/n 39-10044

These valves can be ordered from your local VAN AIR representa-
tive or the factory.

4.6-2 REMOTE DRAIN LINE CONNECTION

IMPORTANT

NEVER CONNECT THE DRAIN LINE TO A PRESSURIZED
LINE. THE DRAIN LINE MUST BE VENTED TO PREVENT
PRESSURIZATION WHEN THE DRAIN VALVE IS OPEN.

The drain line on the vessel can be remotely piped to a contain-
ment vessel or common disposal line. The line or vessel that the
drain line is to be connected to must not be pressurized. It must
be vented to prevent pressurization when the drain valve is open.

The drain line should be of the same size and level with or lower
than the drain valve.

SECTION 5

OPERATION

5.1 PRINCIPLE OF OPERATION

The VAN AIR MIST ELIMINATOR was designed to remove entrained
oils and water mists from compressed air systems. The unit will
provide a high efficiency removal of these particles including
submicron particles.

The element is a cylindrical, fiber-packed unit. The element design
will provide many years of operation.

The process gas containing the mist is directed into the top of the
element. As the gas passes through the element, the entrained
liquid mist is collected on the fibers. The liquid flows to the bottom of
the element and drains into the sump of the vessel. The cleaned gas
exits from the element's outer screen and flows through the outlet of
the vessel.

The collected liquid in the sump area of the vessel must be drained
regularly. A manual drain valve was provided on the vessel drain
line. A regular draining schedule should be developed to insure that
the vessel is being properly drained.

If an electronic drain valve was installed on the drain line, the timer
setting should be adjusted to insure that the vessel is being drained
properly.

The measurement of the pressure differential across the vessel is
the key to assessing the operation of the MIST ELIMINATOR. As
explained in the installation procedures, a highly accurate pressure
differential measurement device should be installed on the vessel. A
PD-7 pressure differential gauge or a U-tube manometer should be
used. The use of two pressure gauges is NOT recommended.

During normal operation, the pressure differential across the vessel
should measure 0.5 to 1.0 PSID. At start up, the differential will
slowly increase as the element becomes saturated with liquid. The
pressure differential reading should stabilize after several days of
operation once the element is saturated.

The pressure differential measurement and the flow rate should be
recorded regularly. The actual pressure differential will proportionally
vary with the gas flow rate into the vessel. If the flow rate of the
process gas is 50% of the vessel rating, the pressure differential
across the vessel should be 50% of normal pressure differential at
rated flow.

A drastic drop in the pressure differential (adjusted for the flow rate)
will indicated that a problem may have developed with the element.
The element should be inspected for ruptures in the fiber layer. The
element also should be checked to insure that it is properly attached
to the vessel.

A drastic increase in the pressure differential indicates the element
has become clogged with solids, tars, or foreign materials that are
not being removed from the element by the irrigation process.

When the pressure differential across the vessel reaches 3 PSID, the
element should be replaced or repacked.

5.2 START-UP PROCEDURES

If inlet and outlet isolation valves were installed on the unit, make
sure both are closed.

Pressurize the process piping. Slowly open the inlet isolation valve.
Do not subject the unit with sudden pressurization.

Once the unit is pressurized, slowly open the outlet isolation valve. If
a bypass loop and valve was installed around the unit, close the
bypass valve.

The MIST ELIMINATOR is now ready for operation.

5.3 SHUTDOWN PROCEDURES

If a bypass loop and valve was installed around the unit, open the
bypass valve.

If inlet and outlet isolation valves were installed on the unit, slowly
close the outlet isolation valve and then the inlet isolation valve.

Open the drain valve and allow the unit to completely depressurize.