Water Cooled Packings
Water cooled packing cases are
required for compressor cylinders based upon the average piston speed
and average cylinder pressure. Cooled packing cases are supplied to help
remove the heat generated as the piston rod/ packing friction increases
with the higher pressures and piston speed.
Cooled packing cases are required
for cylinders in accordance with the following chart:
Notes:
1. All
cylinders that have water cooled packing as standard must be connected
to a water cooling system, unless prior approval is obtained from Ariel.
2. The
above chart applies for only pipeline quality gas. Contact
Ariel Application Engineering to determine if a water cooled packing is
required if a separate lube supply is recommended by the Packager Standards
and the application falls in Region 2.
The packing coolant is circulated
through the packing cups as illustrated in the following drawing.
A packing coolant system is required
for cooling of the packing case(s). The coolant should be a treated water
/ glycol solution. The flow shall be 1 gallon per minute for each inch
of piston rod diameter and requires a nominal pressure drop of 30 psig.
The cooler should be sized for a heat rejection rate of 70 btu/minute/inch
of rod diameter and a coolant inlet temperature into the packing not to
exceed 130 °F.
Cooler water will increase the amount of heat that can be transferred
to the water. Cooler water is better in higher pressure applications.
The following is a schematic of
a typical packing cooling system.
Ariel
Corporation Application Manual
17 Sept 2004