Pumps

Container connections, p. 19 and 22
Gas-tight barrel pump, p.26 Siphon, p.39
Barrel pumps are suitable for larger barrels and open
containers, these draw in the liquid and then eject it.
This family of pumps is characterized by their robust
construction with a good pumping capacity and simple
handling. Different immersion tube lengths mean
that the pumps fit all the usual com mercially available
containers. Low-mounted suction valves ensure
that almost all the residual liquid is removed.
Container connections
In contrast to metal drums, which usually have an
R2“ fine thread, there are no standard connection
threads for plastic drums. There are basically two different
ways of attaching the pump to the drum or
container.
1. The pump can be screwed onto the existing container
thread using a barrel screw joint, possibly in
combination with an adapter.
2. Universal solutions such as conical drum stoppers
can be used.
Antistatic Set, p.23
Materials
The most suitable pumps are robust industrial pumps
made from top-quality materials such as polypropylene
(PP) for acids and alkalis or stainless steel V2A
(1.4301) for flammable liquids. We always recommend
the use of PTFE seals.
Always check that the material is resistant to the
medium to be pumped. In many cases a check against
the chemical resistance list will help – see page 240.
Filling aids
Plastic siphons are a low-priced alternative to mechanical
pumps. Siphons are easy-to-use devices for
safely filling off liquids from a higher container into
a lower one. However, their use with aggressive or
flammable liquids cannot be recommended. The pump
bellows could be attacked by acids and become brittle.
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