F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
2 - I
NSTALLATION
PAGE 2-3
Leveling Limits for Compressors
The limits in Table 2-1 assume that the running oil level is maintained between one half and
two-thirds the height of the sight glass, except for dry sump compressors. Length leveling
limits apply axially (parallel to crankshaft) and width limits apply horizontally (parallel to the
piston rod) within the length and width of the frame.
TABLE 2-1 Maximum Angle from a Horizontal Plane for Leveling Compressors
Aligning Main Bearing Bores
To maximize main bearing life expectancy and help avoid crankshaft failures, it is essential
that compressor frames be installed and remain in position so that main bearing bores can
be maintained in proper alignment. Ariel has established this procedure in an effort to facili-
tate the proper installation of compressor frames and provide a means of periodic inspec-
tion.
1.
The top cover mounting surface of an Ariel compressor frame is manufactured
in a flat plane to a close tolerance. This surface is also held to a close tolerance
with the main bearing bores and the bottom of the compressor feet. When the
frame feet are supported so that the top-cover-mounting surface is flat "in
plane", the main bearing bores are in alignment.
2.
Top-cover-mounting surface flatness
or
soft foot check may be used for frame
sizes up to and including JGU:Z/2-throw frames to be sure main bearing bores
are in proper alignment, except for the JGI which uses only soft foot.
3.
On JGU:Z:B:V:KBB:V/4-throw and /6-throw frames the top plane flatness
and
soft foot checks are
both
required to be sure the main bearing bores are in
proper alignment.
Frame
Maximum Angle from a Horizontal Plane - In/Ft of Distance (mm/m) [ ° ]
1 or 2 Throw
4 Throw
6 Throw
Length
Width
Length
Width
Length
Width
JGM:N
0.420 (35) [2°]
0.500 (42) [2.4°]
N/A
JGP:Q
0.500 (42) [2.4°]
0.500 (42) [2.4°]
N/A
JG
0.460 (38) [2.2°]
0.500 (42) [2.4°] 0.215 (18) [1.0°]
0.500 (42) [2.4°]
N/A
JGA
0.500 (42) [2.4°]
0.500 (42) [2.4°] 0.310 (26) [1.5°]
0.500 (42) [2.4°]
0.190 (16) [0.9]
0.500 (42) [2.4°]
JGW:R
0.095 (7.9) [0.45°] 0.500 (42) [2.4°] 0.025 (2.1) [0.1°] 0.500 (42) [2.4°]
N/A
JGJ
0.420 (35) [2°]
0.500 (42) [2.4°] 0.105 (8.7) [0.5°] 0.450 (37) [2.1°] 0.065 (5.4) [0.3°] 0.460 (38) [2.2°]
JGH
0.375 (31) [2°]
0.500 (42) [2.4°] 0.160 (13) [0.8°]
0.500 (42) [2.4°]
N/A
JGE:T
0.440 (37) [2.1°]
0.500 (42) [2.4°] 0.155 (13) [0.7°]
0.500 (42) [2.4°] 0.090 (7.5) [0.4°] 0.310 (26) [1.5°]
JGK
0.105 (8.7) [0.5°]
0.500 (42) [2.4°] 0.035 (2.9) [0.2°] 0.500 (42) [2.4°] 0.020 (1.7) [0.1°] 0.310 (26) [1.5°]
JGC
0.270 (22) [1.3°]
0.460 (38) [2.2°] 0.100 (8.3) [0.5°] 0.460 (38) [2.2°] 0.060 (5.0) [0.3°] 0.180 (15) [0.9°]
JGD
0.500 (42) [2.4°]
0.460 (38) [2.2°] 0.205 (17) [1.0°]
0.460 (38) [2.2°]
0.125 (10) [0.6°]
0.180 (15) [0.9°]
JGZ
0.500 (42) [2.4°]
0.500 (42) [2.4°] 0.380 (25) [1.8°]
0.500 (42) [2.4°]
0.240 (20) [1.1°]
0.500 (42) [2.4°]
JGU
0.500 (42) [2.4°]
0.500 (42) [2.4°] 0.475 (40) [2.3°]
0.500 (42) [2.4°]
0.300 (25) [1.4°]
0.500 (42) [2.4°]
JGB
N/A
0.250 (21) [1.2°] 0.075 (6.2) [0.4°] 0.180 (15) [0.9°] 0.075 (6.2) [0.4°]
JGV
N/A
0.235 (20) [1.1°] 0.075 (6.2) [0.4°] 0.150 (12) [0.7°] 0.075 (6.2) [0.4°]
KBB:V
N/A
0.165 (14) [0.8°]
0.500 (42) [2.4°]
0.120 (10) [0.6°]
0.500 (42) [2.4°]
