Cashco 3700 - Manual (Page 2)

2 IOM-3700
CAUTION
DO NOT attempt to remove the vent from the tank or
process vessel without fi rst bleeding all pressure from
the system. ALTERNATIVE MEANS OF PRESSURE
RELIEF MUST BE PROVIDED WHEN THE VENT IS OUT
OF SERVICE.
III. INSPECTION AND STORAGE:
The emergency relief vent is carefully packaged to
prevent damage or contamination during shipping.
Inspect the equipment when it is received and report
any damage to the carrier immediately. The vent
should be stored with all the protective fl ange covers
CAUTION
DO NOT change pressure ratings by adding additional
weight to the pallet assembly without consulting the
factory or your VCI representative.
The 3000 Series Vents are designed to mate with a
150# ASME fl ange. Torque guidelines are provided
in Table 1. The Vents are NOT rated for full fl ange
pressure and do not require high bolting torque.
Before installation, remove all packing materials from
inside and outside the vent.
WARNING
The vent must be installed in a vertical position. The
tank nozzle on which the vent is mounted should have
the same nominal diameter as the venting device. It
is recommended that the tank nozzle fl ange face be
within 1 degree of horizontal for best performance of
the venting device.
II. SAFETY WARNINGS:
Tank or system protection is the primary function of
the weight loaded Pressure and/or Vacuum Relief
Vent. It must be selected to meet the total pressure
and vacuum fl ow requirements within the Maximum
Allowable Working Pressure and Vacuum of the
system on which it is installed. Consult API Standard
2000 for tank protection sizing procedures. Improperly
specifi ed relief vents may result in structural damage
to the tank or system, and can cause severe personal
injury or death. When Pipe-Away relief vents are used, backpressure
in the header system will affect the set point of
weight loaded vents by the amount of the header
pressure. Maximum possible header pressure must
be considered when sizing the pressure relief vent.
SECTION II
SECTION III
in place. Make sure that any loading weights that
might have been shipped separately, to protect the
vent during shipping, are accounted for and stored
with the vent. Suppled weights should be installed
during installation, see Section IV.
SECTION IV
IV. INSTALLATION
Inspect the gasket seating surface of the tank nozzle
fl ange. It must be clean, free of scratches, corrosion,
tool marks and fl at.
Model 3700 Emergency Vents are furnished with
fl at faced fl anges. It is recommended that they be
installed on mating fl at face fl anges with a full faced
gasket. If the fl at face of the vent is sealing against
a raised face steel fl ange, a spacer or fi ller ring must
be used to fi ll the annular space of the raised face
steel fl ange.
Make sure the gasket is suitable for the application
and is in good condition.
Fiberglass fl anges require the use of a full-face 150
lb. gasket. For full face gaskets, we recommend the
use of a 1/8-inch PTFE expanded gasket.