Installation
3-12
Algas-SDI Operations & Maintenance Manual P/N 52632
LIQUID PUMP
Is a Liquid Pump necessary? What are your vapor pressure requirements?
Pressure in the storage tank depends on temperature (
See Table 2
). A good
“rule of thumb” for determining when a Liquid Pump is necessary is this: If the
storage pressure will not always exceed the required distribution pressure by 5
psig ( 0.35 kg/cm
2
), a pump is necessary. Install an
ASDI STABILAIRE LIQUID
PUMP
in the liquid line close to the storage tank. To prevent cavitation, place the
liquid strainer at least five feet upstream of the pump inlet. Typically a pump is
not required unless a mixing system is used or temperature at the installation will
be extremely low, causing the pressure to drop below the pressure the required
process pressure.
VAPOR LINE
Install an appropriate regulator immediately downstream of the vapor outlet port.
Pipe from the outlet port of the regulator to the distribution system. Further
reduction of downstream pressure requires a “Second Stage” regulator close to
the consuming equipment. Properly sized piping and regulators will insure
satisfactory service.
NOTE
For safety reasons both FIRST and SECOND stage regulators must
be 250 psig ( 17.58 cm/kg
2
) inlet pressure rated!
SAFETY RELIEF VALVE
If the vaporizer is installed within an enclosure or building,
VENT THE SAFETY
RELIEF VALVE OUTSIDE THE ENCLOSURE AND REDIRECT THE
DISCHARGE UPWARD.
An optional breakaway adapter is required for piping
from the relief valve. Always install a rain-cap or similar device to prevent water
and other debris from entering the relief discharge. If water enters, it may freeze
and prevent the relief valve from proper discharge, creating a potentially
hazardous situation.
ELECTRICAL SERVICE
The Nameplate on the vaporizer and the Data Sheet provided with the manual
provides your specific vaporizer’s electrical power requirements and the drawing
numbers of the appropriate wiring diagrams and schematics. This unit is
constructed to meet NFPA 70 Class I, Division 1 or Division 2, Group D
requirements. All wiring to the unit, including the ground connection, must meet
the applicable codes for the area in which it is being installed. Wire size and type
must comply with the applicable codes for the area in which it is being installed.
Provide a fused disconnect outside of the classified area. If it is not within sight
of the vaporizer, the fused disconnect must have a locking device. Run wire
within rigid conduit, and install a seal-off at the connection of the field conduit to
the vaporizer.