BOC Edwards 18B4B, Инструкция по эксплуатации, Страница: 31 / 62

Feb 04 Issue A
18B4B Vapour Booster Pumps
PAGE
25
25
IN
STALLATION
3.10 Leak test the system
After you have installed the pump, leak-test the
system before you fill the pump with pump fluid, and
seal any leaks found; outgassing from the fluid may
give false test results. The pump fluid is viscous at
ambient temperatures and may block small leaks.
The level of leak tightness required will depend on
the application of your system. You must leak-test
the system to ensure the integrity of your vacuum
system and its vacuum seals.
3.11 Fill the pump with fluid
3.11.1 Safety of vapour pump fluids
Vapour pump fluids are not dangerous when used in
a pump that is operated correctly. But if the pump is
operated incorrectly and is allowed to get to very
high temperatures, the pump fluid can go through a
process of thermal breakdown. The breakdown
products which result can be dangerous.
Table 10 gives more information about the thermal
breakdown of the different vapour pump fluids.
Thermal breakdown is more likely to occur if the
breakdown temperature is close to the operating
temperature of your pump.
Ensure that you comply with the following general
safety recommendations when you handle or use
vapour pump fluids:
• Store pump fluids away from heat and naked
flames.
• Keep fluid containers closed when not in use.
• Prevent spills and minimise operations that
will contaminate the working areas and
equipment.
WARNING
Ensure that you comply with the
safety recommendations given below
when you handle or use pump fluid.
• Use suitable absorbent materials to mop up
small spills, and dispose of the materials as
described in Section 6.2.
• Keep eyewash bottles filled with water readily
available. Use these bottles to immediately
flush the eyes if contaminated with pump fluid.
• Minimise exposure to the pump fluid. Wear
suitable protective clothing, such as
impervious gloves, apron, boots and so on.
Avoid prolonged and repeated contact with
pump fluid.
• Do not put on heavily contaminated items of
clothing or protective equipment until they
have been laundered or decontaminated.
• Wash your hands with soap and water before
eating or smoking, before using toilet facilities
and before leaving work.
3.11.2 Recommended pump fluids
Note: As stated in Section 3.8, the thermal snap-
switches fitted to the pump are preset for use
with AP201 fluid. If you use a different fluid in
the pump, you must adjust the snap-switches.
Choose the best fluid for your application. Take
note of the information given in Table 10 about the
thermal breakdown temperature and the
decomposition products of the various pump fluids.
We recommend that you use Apiezon AP201 fluid
in the 18B4B pumps. Please consult BOC Edwards
or your supplier if you want to use other fluids.
WARNING
Do not use perfluoropolyether
(PFPE) pump fluids in the 18B4B
pump. The thermal breakdown
temperature of PFPE fluids is near to
the operating temperature of the
pump. The thermal breakdown
products of PFPE fluids are very
dangerous.