•
Recheck the pump rotation direction if the electrical supply has been disconnected.
•
'O’ ring replacement intervals vary depending on your application - your local BOCE office
can provide assistance.
•
Do not reuse 'O' rings.
•
Dispose of components, grease and oil safely (see Section 7.2).
•
Take care to protect sealing-faces from damage.
•
Do not touch or inhale the thermal breakdown products of fluorinated materials which may be
present if the iH system has been overheated to 260
o
C and above. These breakdown products
are very dangerous. Fluorinated materials in the iH system may include oils, greases and
seals. The iH system may have overheated if it was misused, if it malfunctioned or if it was in a
fire. BOC Edwards Material Safety Data Sheets for fluorinated materials used in the pump are
available on request: contact your supplier or BOC Edwards. (See Section 1.1 for contact
numbers)
•
Leak-test the system after maintenance work is complete if you have connected or
disconnected any vacuum or exhaust joints; seal any leaks found.
•
Wipe up any water or oil spilt during maintenance to avoid possible risk of slips.
•
Route and secure cables, hoses and pipe-work during maintenance to avoid possible risk of
trips.
6.2 Correct use of tube fittings
Note: We recommend that you use a second spanner to hold the connector in position when you connect
or disconnect a tube fitting.
You must know how to correctly fit and tighten tube fittings in order to prevent gas leaks; use
the procedures in the following sections.
6.2.1 Fit a tube fitting
1. Refer to Figure 6-1 detail A. Undo and remove the nut (4) from the tube fitting (1). Ensure
that the front (tapered) ferrule (2) and the rear ferrule (3) are correctly orientated as shown in
detail A, then loosely refit the nut (4) to the tube fitting (1).
2. Refer to detail B. Insert the tube (5) through the nut (4) and into the tube fitting (1). Ensure
that the tube rests firmly on the shoulder inside the fitting, and that the nut (4) is finger tight.
3. Tighten the nut (4) until you cannot rotate the tube (5). If you cannot turn the tube because of
how it is installed, tighten the nut by
1
/
8
th of a turn.
4. Refer to detail C. Mark the nut (4) at the six o'clock position.
5. Refer to detail D. Hold the body of the connector steady, then turn the nut (4) by 1
1
/
4
turns (to
the nine o'clock position) to fully tighten the connection.
6-2 iH Dry Pumping Systems
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