Heavy Duty Balanced Opposed Compressors - Ariel Corporation

For Models: JGH:E:K:T Section 4 Part Replacement
Water-Cooled Piston Rod Packing
When any disassembly of (optional) “water”-cooled rod
packing cases is required from the as supplied - as received
condition from the manufacturer, proper re-assembly and
leak testing is required.
Reassembly
See “Piston Rod Packing Reassembly” on page 4-17 and
“Types of Piston Rod Packing Rings” on page 4-19.
Refer to the pressure packing assembly in the parts book
supplied with your unit. Contact your distributor if you do not
have a parts book. A pressure packing assembly drawing
also comes with each pressure packing re-build kit.
Water-cooled cases are lapped. Take special care not to
scratch cup mating surfaces; it can cause significant problems.
Cup surfaces must be clean and dry for re-assembly.
The cups are numbered on the outside diameter; assemble
them in consecutive order, starting with the end cup. See the
pressure packing assembly in your parts book and Fig. 4-28
The studs are offset so the cups fit only one way.
Coolant Turnaround Cup Circumferential
Identification Groove (All - beginning in 2006)
O-Ring
Groove
FIGURE 4-28 Water-Cooled Packing
Case Turnaround Cups
Verify the tie studs thread completely into the end cup. Put the proper ring in the groove and face it in
the proper direction. Three long tie studs hold the pressure packing together. The stud holes are not
equally spaced. This prevents misalignment of the stack of parts. When sliding parts onto the tie
studs, take care not to scratch the lapped faces. Unless non-lube, coat rings liberally with clean lubricant
before reassembly. Use only the same lubricant used in the force feed lube system.
Next, install the second cup, position the rings, and verify the two small O-rings are in place around
the coolant holes. Repeat this step to assemble the remaining parts consecutively in the configuration
detailed in the packing case drawing.
Install tie stud nuts and tighten to the values in Table A-3 in Appendix A. Manually verify all rings
move freely, radially, in their grooves. Side-loaded WAT and AL rings are snug, but should still move
manually. Center these rings.
Testing
All internal passages must function with 100% verification. To check passages, blow dry compressed
air through the connection taps on the flange and verify that air exits at the proper holes. Air applied
to the connection tap stamped “Coolant In” should exit the connection tap stamped “Coolant Out”; or
air applied to the tap stamped “Lube” should exit at the appropriate cup on the inside diameter of the
case.
Pressure leak test packing cases as follows:
1. Apply 60 to 100 psi (4 to 7 bar) dry, compressed air to the “Coolant In” connection; it should exit
at connection tap “Coolant Out”. For water-cooled rod packing cases in non-lube service, use oilfree
compressed air. Air applied to the tap stamped “Lube” should exit at the appropriate cup on
the inside diameter of the case.
2. Plug the “Coolant Out” connection and apply 60 to 100 psi (4 to 7 bar) dry, compressed air to the
“Coolant In” connection through a ball valve with a calibrated pressure gauge located between
the ball valve and packing case. Close the ball valve and disconnect the air supply. Pressure
should not drop for five minutes, minimum. Disassemble, inspect, repair, re-assemble, and retest
any cases that fail this test. Packing cases may be bolted into place in a cylinder head to aid
sealing, with proper bolting and torques.
3/11 PAGE 4-23