Heavy Duty Balanced Opposed Compressors - Ariel Corporation

FOR MODELS: JGZ AND JGU SECTION 2 - COMPRESSOR INSTALLATION
d.Every 6 months or 4000 hours as recommended maintenance inspection.
8. The Equipment used for flatness measurements should have a published accuracy
of
+ 0.001 inches (+ 0.025 mm) over the required distance to measure the entire
length of both frame rails.
9. To check soft foot, the compressor frame hold down bolting is to be properly
installed and tightened. Loosen each hold down bolt individually while checking
the frame foot to skid deflection with a calibrated dial indicator. Correct any hold
down position that deflects more than 0.002 inches (0.05 mm) when released.
Re-torque the hold down bolt and repeat at each frame to skid bolt.
Setting Crosshead Guides
With crosshead guides and cylinders unsupported, prior to bottle installation:
1. Measure the clearances between
each crosshead guide foot and the
guide support. Except for JGZ:U and
KBB:V frames when equipped with
long two compartment (L2) crosshead
guides, measure clearance at
the outboard feet under the guide
extension, which are used to support
the guide and the feet under the
guide are to be unsupported.
2. Completely fill the clearances with
shim stock (reference Figure 2-1).
3. Tighten the crosshead guide foot (or
long two compartment guide extension
foot) to guide support holddown
bolting to full fastener torque.
Refer to Ariel ER-26.
Crosshead
Guide Foot
Shim Thickness =
Unsupported + Deflection
Thicknesses to paragraph
4. above
Crosshead Guide
Skid Support
(Connected to Skid)
FIGURE 2-1 Crosshead Guide Foot to Skid-Support Shim -
Typical
4. Loosen the bolting while checking with a dial indicator to be sure that the clearance is completely
filled and there is no deflection.
5. Using the information from the current Ariel Performance Program, determine the estimated
crosshead guide foot deflection for JGH:E:K:T:C:D:Z:U:KBB:V frames. This calculated value is
required to compensate for the deflection or droop of the cantilevered weight of the guide and
cylinder. For the JG:A:M:N:P:Q:R:W:J frames, the guide and cylinder weights are not sufficient to
deflect the guide.
6. Lift or jack cylinder, just slightly to allow insertion of additional shims based on the calculated
value.
7. Re-tighten the crosshead guide hold down bolting to full fastener torque.
8. Repeat for each crosshead guide support.
9. Shims may need to be adjusted so that the crosshead to guide top and bottom clearances, and
piston rod run-out measurements are within the tolerance requirements. Reference Section 5 for
checking crosshead clearances and piston rod run-out, and Section 1 for tolerance limits.
10. For some applications, head-end cylinder supports may be desirable for larger classes of cylinders
(bosses and tapped holes are provided on all K:T:C:D:Z:U:B:V class cylinders). See Ariel
cylinder outline drawings for dimensional details. These supports must be adjusted and set when
the components are at operating temperature.
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