The pumps are designed so that they can be upgraded by the addition of a range of accessories. The accessories are supplied with all the required connections and no special tools are needed to fit them.

 

Trapping particulates

In any application, first ensure that particulates in the process stream are trapped before they get into the pump: use the ITM or ITF inlet filters, which are suitable for use with oil-sealed and dry pumps. However, in processes that generate or contain large amounts of particulates, some will enter the pump: use our EOF an external oil filter to remove particulates from the pump oil during operation.

 

ITF inlet dust filters

If the mechanical pump is a backing pump for a diffusion pump, the diffusion pump will trap particulates during normal operation, but the diffusion pump will not trap dust during the roughing stage of the process cycle. We recommend you fit an ITF filter to the mechanical pump inlet (that is, in the foreline): this filter has a replaceable element. Note that the impedance of a clean filter will cause the pumping speed to decrease by about 10% at 1mbar and 20% at 10-2 mbar. The ITF filter is more that 96% efficient, when tested in accordance with BS2831.

 

ITM high capacity inlet dust filters

Use an ITM filter for applications where there is a high load of dust and particulates. Fit the ITM directly to the inlet of a rotary or mechanical booster pump. This filter has a stainless steel mesh element that can be washed and re-used. It is ideal for use when backing diffusion pumps or for wet processes where a paper filter may become blocked quickly. The ITM filter has high conductance and is there­fore ideal for applications that require fast pump down times. The ITM filter has an efficiency of 90%, when tested in accordance with BS3831.

 

EOF external oil filters

Use the EOF filters with the EM oil-sealed rotary pumps, to remove particulates trapped in the pump oil. There are two types of EOF filters.

The EOFA and EOFM filters use the internal pressurized oil system of the pump to continually filter a proportion of the pump oil. These filters are only suitable for hydrocarbon oil. The EOFM filter removes particulates down to 0.5 microns, and the EOFA filter both removes particulates and includes an active element to remove acidic and other aggressive contam­inants from the oil.

EOF pumped external oil filters have their own oil re-circulation pump. The re-circulation pump has a high flow rate and allows large quantities of oil to be filtered. The filter is fitted with a gauge, which indicates when the filter needs to be changed. This filter is suitable for hydrocarbon and PFPE oils.

 

Pumping vapors

The use of gas ballast significantly improves vapor-handling capability of oil sealed rotary pumps. We offer a number of accessories to improve the utility of gas ballast.

 

EBV gas ballast control valve

Fit EBV gas ballast control valve to allow remote or automated control of gas ballast.

 

TCV temperature control valve

Fitting a TCV can enhance the vapor pumping performance of the larger oil sealed pumps. Use the TCV both to warm-up the pump faster (which reduces the amount of condensation in the pump) and to reduce water usage and cost.

 

ITC inlet chemical traps

Fit an ITC trap to the inlet of the pump to protect against the aggressive process vapors that may corrode the pump or degrade the oil.

 

Trapping liquids

The use of gas ballast allows an oil-sealed pump to process significant quantities of vapor. However, oil sealed pumps can not pump liquid streams and it is important both to remove liquids before they reach the pump inlet and to prevent condensed liquids from flowing back into the pump outlet. The following accessories may be suitable for your application:

 

ITO inlet trap

The ITO inlet trap is ideal for processes where there is a risk of liquids in the process entering the pump inlet. Fit the ITO trap to the pump inlet or elsewhere in the foreline.

 

CP catchpot

Process vapors passing through the pump may condense after the pump outlet, in the exhaust line. Fit a CP catchpot to the pump outlet to trap the condensation and prevent them flowing back into the pump.

 

Exhaust management

You should aim to minimize the impact of gases and vapors that exhaust from the pump outlet. BOC Edwards offers a range of exhaust management systems for the most exacting applications However, for most straightforward applications of oil sealed rotary pumps, we recommend that you fit an oil mist filter to the pump outlet to remove oil mist vapor. A mist filter is not required if you vent the exhaust gases remotely or pass them through exhaust scrubbing equipment.

 

MF oil mist filters

The MF filters remove oil mist (vapor) from the pro­cess gases exhausted from the outlet of an oil sealed pump. The filters remove both odor and oil vapor and so prevent it from reaching the atmo­sphere and the workplace.

 

Back migration

When operated at ultimate pressure for extended periods of time, any oil-sealed pump allows oil vapor to back migrate into the process chamber. The back-migration of oil vapor could contaminate your process or your vacuum system.

 

ITC inlet chemical trap

Fit an ITC inlet chemical trap (filled with an alumina charge) to the pump inlet to trap oil vapor and to prevent back migration.

 

Spares

The clean and overhaul kit contains all of the springs, gaskets, seals and other components required for routine maintenance and seals and other components required for routine maintenance and whenever the pump is dismantled. Add a blade kit for a full service. The major service kit contains gaskets, seals, filters, bearings and other components required for a complete service after prolonged operation or after pumping corrosive or gases and vapors.

·         Clean and overhaul kit

·         E2M80 blade kit

·         E2M80 major service kit