Cashco 1088 - Tank Blanketing - Manual

INSTALLATION, OPERATION AND MAINTENANCE MANUAL (IOM) IOM-1088
06-05
SECTION I
I. DESCRIPTION AND SCOPE
Model 1088
Vacu-Gard Blanketing Valve
SECTION II
II. PRIOR TO INSTALLATION
It is always good practice to clean out blanket gas
supply lines prior to valve installation to get rid of dirt,
sand, loose scales and other foreign particles trapped
in the piping. This is particularly true for new tanks and/
or new piping. One way to accomplish this is to blow
out the lines from the supply side up to the connection
to the Vacu-Gard inlet.
SECTION III
III. INSTALLATION
The Model 1088 Vacu-Gard is a tank blanketing valve
intended for installation on top of small storage tanks.
The standard valve comes with FNPT connections.
Flanges may be attached by adding nipples. Valve
bodies with welded fl anges may be ordered from the
factory. There are three styles of the Model 1088 this IOM will cover: internal sensing, integral dip-tube, and
remote sensing. The functionality of the unit will be the
same regardless of the sensing style. Please refer to
the applicable drawings in the back of this IOM manual
for recommended installation schematics.
CAUTION
Follow your company’s safety procedures to avoid
injury to personnel or damage to equipment.
It is always good practice to install a main line fi lter
upstream of any tank blanketing valve. The element
should be approximately 5-40 microns with a fl ow ca-
pacity equal to or greater than that of the Vacu-Gard.
The valve should be installed in the normal upright po-
sition. The inlet is horizontal and the outlet is vertical
downward. There is an optional horizontal outlet for re-
mote sensing valves. This option is not available for
the integral dip-tube design. All outlet piping from the
valve body to the vessel must be as large or larger than
the outlet port in the body. Keep piping as short as pos-
sible for best valve performance.
For Internal Sensing:
Pipe as recommended above. Note that internal sens-
ing yields only 25% of full capacity.
For Remote Sensing:
The sense line should be a 1/2” O.D. tube (or larger)
and the length should not exceed fi fteen feet. Longer
lengths may be used with larger diameter sense lines.
The sense line should slope downward from the valve
to the tank to allow condensate, if any, to drain back
into the tank. (The sense port is the port on the side of
the body marked with an “S”. A “tee” may be added to
the sense port for gauging pressure in the vessel.
For Dip-Tube Sensing:
The integral dip-tube line must protrude into the tank at
least 6” below the roof. NOTE: The port at the end of
the main valve body opposite the inlet is not a sense
port. (This port should not be used for pressure gaug-
ing since the pressure at this point may be higher than
the maximum tank pressue and may cause damage to