GE H301 Series, Operating Manual

Page: 116 / 137

106 | Chapter 8: Maintenance
F L A M M A B L E
FLAMMABLE OR TOXIC PROCESS GAS MAY LEAK FROM THE
VVCP PISTON STEM WHENEVER THE JAM NUT IS LOOSENED.
THE SEAL WASHER UNDER THE JAM NUT IS USED TO
SEAL GAS FLOW ACROSS THE STEM THREADS. EXERCISE
ALL NECESSARY SAFETY PRECAUTIONS WHEN TOXIC OR
POTENTIALLY EXPLOSIVE GAS/AIR MIXTURES ARE PRESENT.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (5)
A S P H Y X I A T I O N
WHENEVER THE PROCESS GAS CONTAINS HYDROGEN
SULFIDE (H
2
S) OR OTHER TOXIC GASES UNDER NO
CIRCUMSTANCES SHOULD YOU ADJUST THE VVCP DURING
COMPRESSOR OPERATION.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (7)
H A Z A R D O U S G A S E S
WEAR APPROPRIATE PROTECTIVE EQUIPMENT.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (7)
The adjustment of manual variable volume clearance pockets (VVCP) is applicable
to all HSR compressor cylinders using head end (HE) VVCP's.
General Information
The VVCP’s piston ring is purposefully designed not to be completely gas tight. This
allows for minor gas and liquid migration across piston ring/O-ring. This allows
for easier VVCP piston adjustment when the cylinder is pressurized. Gas trapped
in the VVCP housing will slowly vent across the VVCP piston ring or O-ring during
cylinder de-pressurization. However, accumulated liquids, debris or rust around
the VVCP’s piston can trap gas in the housing, substantially increasing VVCP gas
depressurization time.
A S P H Y X I A T I O N
DO NOT REMOVE OR LOOSEN ANY GAS CONTAINMENT
BOLTING, OR THE VVCP HOUSING BOTTOM DRAIN PLUG, UNTIL
GAS TRAPPED IN THE HOUSING HAS FULLY VENTED.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (7)