F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
2 - I
NSTALLATION
PAGE 2-11
Alignment Methods
1.
Laser - the preferred method for JGC:D:Z:U:B:V and KBB:V frames.
2.
Face/Rim Dial Indicator Measurements at Coupling.
3.
Reverse Indicator.
4.
Optical.
5.
Mechanical direct to computer.
Electrical Grounding
CAUTION: The compressor skid must be wired to a suitable earth ground to reduce the
potential for electric shock injury, while protecting the equipment. Refer to the local elec-
trical codes to determine a suitable ground rod.
Pneumatically Actuated Unloaders & Clearance Devices
When compressor cylinders are equipped with pneumatically actuated unloaders or clear-
ance devices, care must be taken to be sure that the actuating air or gas system is appropri-
ately vented, and that the system incorporates provisions that will not allow the process gas
to back flow into the actuating air or gas system.
The control media supply system and vent system for the unloader must provide for the safe
and effective operation of the unloader throughout the full range of compressor operating
conditions. ACI, an Ariel supplier, has published a document outlining system design and
requirements. Please reference this document for system design and evaluation. The docu-
ment may be found at support/vendor literature/reciprocating compressors/ACI on the Ariel
web site:
Vents and Drains
It is critical, for the safe operation of the compressor, to be sure that all vents and drains are
open, functional and, if necessary, tubed off of the skid or out of the building to a safe atmo-
sphere. The venting of gases and vapors, and the disposal of drained fluids should be envi-
ronmentally safe. Depending upon your climate and insect population it can be necessary to
install screens over the vents and drains to be sure that they do not become blocked. This
can be essential if the compressor is shutdown for a long period of time.
Some other points are:
1.
A blow-down vent must be provided to safely relieve pressure from the system
for maintenance purposes. Any vent or blowdown line connected to a common
vent or flare header must have a back-flow prevention check valve.
2.
Adequate vents and drains will be provided for the distance piece, and primary
packing vent. Primary vents and drains shall be independently vented from the
secondary vents and drains. All vents and drains shall be installed in such a
manner as to prevent the collection of liquids that could cause the build-up of
either gas or liquid. When a heavier than air gas is involved, vent and drain