The packing assembly was subjected to {TAIL ~ an EPA Method 21 leakage test} with over 100,000 mechanical cycles of operation, and a packing leakage of less than 500 ppm was obtained using methane as {HEAD ~ the test fluid} 
The packing assembly was subjected to { TAIL ~ an EPA Method 21 leakage test } with over 100,000 mechanical cycles of operation , and a packing leakage of less than 500 ppm was obtained using methane as { HEAD ~ the test fluid }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD