RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-200 IOM
Page 4
ALLOWABLE FLANGE LOADS
NOZ.
MOMENTS (ft-lbf)
LOAD (lbf)
SIZE
AXIAL
VERT.
LAT.
AXIAL
VERT.
LAT.
NPS
M
R
M
C
M
L
P
V
C
V
L
1
25
25
25
50
50
50
1.25
25
25
25
50
50
50
1.5
50
40
40
100
75
75
2
100
70
70
150
125
125
3
250
175
175
225
250
250
4
400
200
200
300
400
400
5
425
400
400
400
450
450
6
1000
750
750
650
650
650
8
1500
1000
1000
1500
900
900
10
1500
1200
1200
1500
1200
1200
12
1500
1500
1500
1500
1500
1500
14
2000
1800
1800
1700
2000
2000
FOUNDATION
Each RWB II Rotary Screw Compressor Unit is shipped
mounted on a wood skid which must be removed prior to
unit installation.
Allow space for servicing both ends
of the unit. A minimum of 36 inches
is recommended.
The first requirement of the compressor foundation is that it
must be able to support the weight of the compressor pack-
age including coolers, oil, and refrigerant charge. Screw com-
pressors are capable of converting large quantities of shaft
power into gas compression in a relatively small space and
a mass is required to effectively dampen these relatively high
frequency vibrations.
Firmly anchoring the compressor package to a suitable foun-
dation by proper application of grout and elimination of pip-
ing stress imposed on the compressor is the best insurance
for a trouble free installation. Use only the certified general
arrangement drawings from Frick Co. to determine the mount-
ing foot locations and to allow for recommended clearances
around the unit for ease of operation and servicing. Founda-
tions must be in compliance with local building codes and
materials should be of industrial quality.
The floor should be a minimum of 6 inches of reinforced con-
crete and housekeeping pads are recommended. Anchor
bolts are required to firmly tie the unit to the floor. Once the
unit is rigged into place (See RIGGING and HANDLING),
the feet must then be shimmed in order to level the unit. The
shims should be placed to position the feet roughly one inch
above the housekeeping pad to allow room for grouting. An
expansion-type epoxy grout must be worked under all areas
of the base with no voids and be allowed to settle with a
slight outward slope so oil and water can run off of the base.
When installing on a steel base, the following guidelines
should be implemented to properly design the system base:
1. Use I-beams in the skid where the screw compressor will
be attached to the system base. They should run parallel to
the package feet and support the feet for their full length.
2. The compressor unit feet should be continuously welded
to the system base at all points of contact.
3. The compressor unit should not be mounted on vibration
isolators in order to hold down package vibration levels.
4. The customer’s foundation for the system base should fully
support the system base under all areas, but most certainly
under the I-beams that support the compressor package.
When installing on the upper floors of buildings, extra pre-
cautions should be taken to prevent normal package vibra-
tion from being transferred to the building structure. It may
be necessary to use rubber or spring isolators, or a combi-
nation of both, to prevent the transmission of compressor
vibration directly to the structure. However, this may increase
package vibration levels because the compressor is not in
contact with any damping mass. The mounting and support
of suction and discharge lines is also very important. Rub-
ber or spring pipe supports may be required to avoid excit-
ing the building structure at any pipe supports close to the
compressor package. It is best to employ a vibration expert
in the design of a proper mounting arrangement.
In any screw compressor installation, suction and discharge lines
should be supported in pipe hangers (preferably within 2 ft. of
vertical pipe run) so that the lines won’t move if disconnected
from the compressor. See table for Allowable Flange Loads.
A licensed architect should be consulted to determine the
proper foundation requirements for any large engine or tur-
bine drive.
When applying screw compressors at high pressures, the
customer must be prepared for package vibration and noise
higher than the values predicted for normal refrigeration duty.
Proper foundations and proper installation methods are vi-
tal; and even then, sound attenuation or noise curtains may
be required to reduce noise to desired levels.
For more detailed information on Screw Compressor Foun-
dations, please request Frick publication S70-210 IB.
RIGGING and HANDLING
THIS SCREW COMPRESSOR PACK-
AGE MAY BE TOP-HEAVY. USE CAU-
TION IN RIGGING AND HANDLING.
The unit can be moved with rigging, using a crane or forklift,
by hooking into the four lifting eyes on the compressor and
motor bases. If no motor is mounted, the lifting ring should
be moved to the compressor side of the center of the unit
because 60 percent of the weight is toward the compressor
end. If a motor is mounted appropriate adjustment in the lift-
ing point should be made to compensate for motor weight.
Adjustment of the lifting point must also be made for any
additions to the standard package such as an external oil
cooler, etc., as the center of balance will be effected.
The unit can be moved with a forklift by forking under the
skid, or it can be skidded into place with pinch bars by push-
ing against the skid. NEVER MOVE THE UNIT BY PUSH-
ING OR FORKING AGAINST THE SEPARATOR SHELL
OR ITS MOUNTING SUPPORTS.
SKID REMOVAL
If the unit is rigged into place the skid can be removed by
taking off the nuts and bolts that are fastening the unit mount-
ing supports to the skid before lowering the unit onto the
mounting surface.
If the unit is skidded into place remove the cross members
from the skid and remove the nuts anchoring the unit to the
skid. Using a 5 ton jack under the separator raise the unit at
the compressor end until it clears the two mounting bolts.
Spread the skid to clear the unit mounting support, then lower
the unit to the surface. Repeat procedure on opposite end.
