INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA 9610™
26 | Page
• Use a correct size wrench to lock the body of the fitting and tighten the nut with
another correct size wrench for 1- 1/4 turn for 1/4" fittings, 3/4 turn for 1/8"
fittings. Watch the marks.
• Before connecting the tubing to the analyzer they must be blown through
with dry nitrogen or instrument air to remove all particles.
• All connections must be checked against leakage prior to putting the
analyzer in operation or installing the tubing.
• Pressurize the lines with nitrogen or instrument air at 7bar maximum to perform
leak test. Check each connection with snoop or soap.
• Make sure before pressurizing for leak-test that the power to the analyzer is off
(sample and calibration selection valves closed) and that the instrument
air supply isolation valve in the analyzer is closed.
• Vent connections must not be pressure tested while connected to the analyzer.
Disconnect and cap these tubes if leak test is required.
• Re-connection of the fittings is done by hand tightening the nut followed
by wrench tightening for 1/4 turn.
• If a leak is detected, it might be fixed by tightening the fitting step by step a little
more (up to a 1/4 turn) until it is tight. Then the fitting must be
inspected if it has not been over-tightened. This is done by disconnecting
the fitting and to check if the ferrules can still be rotated in relation to
each other and the pipe. (If the ferrules can also be moved in an axial
direction the fitting is too loose) If the ferrules are stuck, the pipe must
be cut just after the nut and newly installed according above instructions
using new ferrules. The nut can be re-used.
• If this does not solve the problem, remove the fitting, and inspect the
fitting body for damage. If it is damaged the complete fitting must be
replaced. If the body is not damaged, the pipe must be cut just after the
nut and newly installed according above instructions using new ferrules.
The nut can be re-used.
• Disconnected fittings can be re-installed by hand tightening the nut followed by
wrench tightening for 1/4 turn. It is recommended to perform a leak test after
re- installation.
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