Dura 65
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Version 1.0v-05/2021
© Verder International B.V
7.2.2 Cleaning Protocol for Hoses
VERDERFLEX hoses should be cleaned with the following
protocol –
NBR, NR and CSM Hoses:
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VERDERFLEX NBR, NR and CSM hoses should be
cleaned with the following protocol:
1. First flush 0.5% Nitric Acid (HNO3) solution at up to
50°C, max 10-15 minutes
2. Second flush 5% Caustic soda (NaOH) solution
at up to 50°C, max 10-15 minutes and eventually
steamed open ends for 15 minutes at up to 110°C
3. Final flush: flush with clean water to remove all
traces of cleaning solutions
EPDM Hoses:
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VERDERFLEX EPDM hoses should be cleaned with the
following protocol:
1. First flush 0.5% Nitric Acid (HNO3) solution at up to
50°C, max 10-15 minutes
2. Second flush 5% Caustic soda (NaOH) solution
at up to 50°C, max 10-15 minutes and eventually
steamed open ends for 15 minutes at up to 130°C
3. Final flush: flush with clean water to remove all
traces of cleaning solutions
NBRF Hoses:
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VERDERFLEX NBRF food grade hoses should
be cleaned with the following protocol:
1. First flush 0.5% Nitric Acid (HNO3) solution at up to
50°C, max 10-15 minutes
2. Second flush 5% Caustic soda (NaOH) solution
at up to 50°C, max 10-15 minutes and eventually
steamed open ends for 15 minutes at up to 110°C
3. Final flush: flush with clean water to remove all
traces of cleaning solutions
Under no circumstances should VERDERFLEX NBRF
food grade hoses be cleaned with Sodium Hypochlorite
(NaOCl) based cleaning solutions, neither should the above
concentrations, exposure, durations or temperatures be
exceeded.
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Food Grade Approval
All VERDERFLEX NBRF food grade hoses’ inner liners are
certified as compliant to:
•
FDA – CFR 21 Parts 170 to 199 – Item 177.2600
•
EC regulation No.1935/2004
•
EC regulation No.2023/2006
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Hose Description
All VERDERFLEX NBRF food Grade hoses consist
of a smooth black inner food grade liner bonded to a
non-food grade outer. The inner liner is taste-free and odour-
less.
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Hose Installation
All VERDERFLEX NBRF food Grade hoses must
be installed in accordance with the procedures defined
in the VERDERFLEX Operating and Maintenance manual.
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Identification
VERDERFLEX NBRF food Grade hoses can be identified by:
Both an external Yellow Coding / Identification tape
and an additional white longitudinal stripe. The hose will also
have glass fork symbol as per Regulation (EC) 1935/2004.
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Pump Installation
VERDERFLEX pumps using VERDERFLEX NBRF Food Grade
hoses must be installed in accordance with recommendations
made by the pump’s supplier. In particular, special care must
be given to the suction and discharge line conditions and that
the hose is shimmed in accordance with VERDERFLEX’s
recommendations. Should there be any doubt about any
installation details, these must be discussed with the pumps’
supplier.
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Particle Release
All hoses will release small quantities of rubber into the product
stream, especially immediately after the hose installation and
just prior to hose failure. Whilst the rubber released will be food
grade particles, these may cause end-user concerns about
contamination and so we recommend suitable particle capturing
devices such as filters are fitted into the pump’s discharge line.
Figure 16 Verderflex NBRF Food Grade Hose Identification
