Ariel JGJ Series, Technical Manual

Page: 111 / 141

F
OR
M
ODELS
: JGW, JGR
AND
JGJ S
ECTION
5 - M
AINTENANCE
1/01 PAGE 5 - 39
Water-Cooled Compressor 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 testing is
required. This is to ensure that the cases do not leak.
Re-assembly
Cases are lapped, and care must be taken to prevent scratching of the mating surfaces of
the cups. Scratches can cause significant leakage problems.
The cups are numbered on the outside diameter and are to be assembled in consecutive
order, starting with the end cup. The studs are offset so the cups will only fit one way.
Make sure the tie studs are completely screwed into the end cup. Put the proper ring in the
groove and facing the proper direction. Be careful when sliding parts onto the tie studs to
ensure that no scratching occurs to the lapped faces.
Install second cup next, put the rings into place, and make sure the two (2) small O-rings are
in place around the coolant holes.
Continue assembling the remaining parts in the proper configuration to the packing case
drawing. In consecutive order, by repeating the above step.
Install tie stud-nuts and tighten to the values given in Figure 1-11 on page 1-15. Using fin-
gers, make sure that all rings move freely, radially, in their grooves. Side loaded WAT and
AL rings will be snug, but should still move using fingers.
Testing
100% verification of function is required for all internal passages.
The passages are to be checked by blowing compressed air thru the connection taps on the
flange and verifying that air is exiting at the proper holes. When air is applied to the connec-
tion tap stamped “Coolant In”, air should be exiting the connection tap stamped “Coolant
Out”, or if air is applied to the tap stamped “Lube”, air should be exiting at the appropriate
cup on the inside diameter of the case.
Pressure leak test packing cases as follows:
1 Plug the “Coolant Out” connection>
2 Apply 60 to 100 psi (400 to 700 kPa) compressed air pressure to the “Coolant
In” connection>
3 Submerse the pressurized case in a tank of oil (use water for non-lube cylin-
ders).
4 After the air trapped in the ring grooves has been released, there should be no
continuous stream of bubbles coming from the pressurized case.
5 Cases which fail this testing procedure are to be disassembled, inspected,
repaired, re-assembled and re-tested.
All cylinders with water-cooled packing must be connected to a circulating water cooling sys-
tem that will provide the required flow, pressure drop, inlet temperature and heat rejection,
unless prior approval is obtained from Ariel to leave it unconnected.