BOC Edwards EO2K, Instruction Manual

Page: 37 / 62

EO2K, EO4K and EO6K Diffusion Pumps
OP
ERATION
PAGE
31
Issue G 31 Aug 06
4 OPERATION
4.1 General safety
During operation, take note of the following basic guidelines:
• On water-cooled EO pumps, always turn on the cooling-water supply before you switch on the EO
pump, otherwise the pump will overheat.
• When the pump is at operating temperature, never allow the backing pressure to rise above the
critical backing pressure for the fluid used (see Section 2.2).
• Always allow the pump to cool down before you turn off the cooling-water supply. Allow at least
30 minutes for the EO2K and EO4K pumps, and at least 45 minutes for the EO6K pumps.
• Always allow the pump to cool down (see above) before the pump-inlet and backing pressures are
allowed to rise above their critical values.
The procedures in the following sections assume that your EO pump is used in conjunction with a
pumping system configured as shown in Figure 15.
WARNING
Do not use the EO pump to pump flammable gases. If you do, this may result in an
explosion or fire. (The interior of the pump can reach very high temperatures, and will
remain hot after the pump is switched off, until the pump has cooled down.) If in doubt
about the compatibility of gases with the use of the EO pump, contact BOC Edwards for
advice.
WARNING
Do not operate the pump when the cooling-water flow through the cooling-coil is
restricted. If you do, water in the cooling-coil may boil, the cooling-coil may fracture, and
hot water and steam which escapes from the cooling-coil may injure people.
WARNING
Do not touch any part of the pump when it is switched on. Avoid contact between the
pump and combustible materials, plastic materials and electrical cables. Surfaces of the
pump are very hot and can cause injury to people and damage to equipment.
WARNING
If the cooling-water supply fails, allow the pump to cool before you disconnect the
cooling-water supply and return pipelines from the pump. If you do not, steam or water
may be ejected from the cooling coil when you disconnect the pipelines and you may be
injured.
WARNING
Do not expose any part of your body to vacuum. If you do, you may be injured.