BS EN 13951 pumps
BS EN 13951:2012 Liquid pumps - Safety requirements - Agrifoodstuffs
equipment; Design rules to ensure
hygiene in use.
MDM PUMPS LTD specialises
in tailor-made hygienic pumps using components machined from solid
stainless steel 316L bar to give smooth, crevice-free internals, fitted
with FDA-approved seals and hygienic connections.
This standard applies to liquid pumps and pump units operating with agrifoodstuffs. It is NOT
intended to be used for pumps handling pharmaceutical products. The
standard provides hygiene related requirements to prevent the pump causing contamination of the
pumped product when used in accordance with the instruction handbook. Note: due to the
influence of the product, the process and the cleaning regime adopted, it
is only the end-user that can ultimately ensure hygienic conditions during
This type C standard is a means of conforming
to essential requirements of the New Approach Directive 2006/42/EC on machinery.
The standard makes reference to EN 1672-2:2005+A1:2009 Food
processing machinery - Basic concepts - Part 2 Hygiene requirements.
We need to request specific information at the time of
- Cleanability level required - levels 1, 2, 3 or 4
(see table below) - the level
selected should take into account the risks arising from the pumped
product, the placement of the pump in the process and the cleaning regime
- If abrasive fluids are pumped (eg crystalline or fibrous
foodstuffs), then the possibility of abrasive wear needs to be discussed
and the choice of materials agreed.
- Surface finishes - the cleanability depends of the topography of
the surface (profile, roughness), local fluid velocities, pump type,
application and cleaning process. What is required depends on the pump
application, eg the product itself (viscosity / effective viscosity and
tenacity of residues) and where the pump is in the process (ie handling of
raw, semi-processed or final product). We recommend 0.8ÁmRa
for our pure finish.
- Connections - the customer will select the most appropriate
connection having considered the hazards which may arise from their
selection, installation and operation. Retention of product may be due to
misalignment, physical change from thermal or chemical effects, incorrect
installation (over or under tightening, omission of parts), or gaps and
cavities inherent in the design. Hazards can arise from forces and moments
from the pipework, unscrewing or mechanical shocks.
- Seal types. The hygienic risk level depends on the pumped product
and the seal type. Note that mostly the liquids will be 'Low viscous', and
therefore the risk with a single mechanical seal will be low or medium.