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Information and general warnings
2.3
Guidance for the use of bio fuel blends up to 10%
Background
With increasing focus on renewable and sustainable energy re-
quirements, Bio fuel usage is set to increase. Riello is committed
to promoting energy conservation and the use of renewable en-
ergy from sustainable resources including liquid bio fuels, howev-
er there are some technical aspects that must be considered at
the planning stage of using such fuels to reduce the potential for
equipment failure or the risks of fuel leakage.
Liquid Bio fuel is a generic description used for oil that can come
from numerous feed stocks including recycled cooking oils.
These types of oils have to be considered and treated differently
from standard mineral or fossil fuels, as they are generally more
acidic, hydroscopic and less stable.
Due to this, a holistic approach is needed from the specification
of the liquid Bio fuel, the storage of the fuel, its oil supply line and
ancillary equipment, and very importantly the oil filtration and the
burner itself. The specification for FAME (Fatty Acids Methyl Es-
ter) liquid Bio fuel is critical to reliable equipment operation.
It is a minimum requirement that the fuel blend (up to 10% Bio) is
obtained with gas oil in accordance with the relevant EN stand-
ards, regional regulations and FAME in accordance with EN
14214. It is also important that the fuel blends meet the require-
ments related to operational environment conditions within the
relevant EN standards.
When choosing your Riello oil products where you know Bio fuels
will be in use, please make sure that a Bio compatible burner and/
or components have been supplied. If an existing burner is to be
used with a liquid Bio fuel then a kit may be required to make it
compatible and the guidance notes enclosed concerning oil stor-
age and filtration must be adhered to. The end user is responsible
for the thorough verification of the potential risks associated with
the introduction of a bio fuel blend and the suitability of the appli-
ances and installation applicable.
Irrespective of any warranty given by Riello in relation to normal
use and manufacturing defects, when fuels not meeting the rele-
vant standards are used, or where fuel storage issues have not
been addressed correctly, or the equipment used is not compat-
ible, if failures occur which are directly or indirectly attributed to
such issues and/or to the non-observance of this guidance, then
no warranty or liability is implied or accepted by Riello.
2.3.1
Information and general instructions
To ensure consistency, the supplier of the fuel must be able to
demonstrate compliance with a recognised Quality Control and
management system to ensure high standards are maintained
within the storage, blending and delivery processes. The installa-
tion oil storage tank and its ancillaries must also be prepared BE-
FORE liquid Bio fuel is introduced. Checks and preparation
should include;
For new installations, make sure that all materials and seals
in the oil storage and supply line to the burner are compati-
ble with Bio fuels. For all installations, there must be a good
quality bio compatible oil filter at the tank and then a sec-
ondary filter of 100 Microns protecting the burner from con-
tamination.
If an existing oil storage tank is to be used then in addition to
the materials checks as detailed above, it will be essential
that the tank is first inspected for condition and checked for
water or other contamination. Riello strongly recommends
that the tank is cleaned and oil filters replaced prior to Bio
fuel delivery. If this is not completed then due to the hydro-
scopic nature of Bio fuel, it will effectively clean the tank,
absorb water present which in turn will result in equipment
failure that is not covered by the manufacturer's warranty.
Depending on the capacity of the oil storage tank and oil
usage, fuels may remain static within the tank for some con-
siderable time and so Riello recommends that the oil distrib-
utor is consulted regarding the use of additional Biocides
within the fuel to prevent microbial growth from occurring
within the tank. Riello suggests that fuel suppliers and or
service companies are contacted for guidance on fuel filtra-
tion. Special attention should be applied to duel fuel applica-
tions where oil may be stored for long periods of time.
The burner must be set according to the appliance applica-
tion and commissioned checking that all combustion param-
eters are as recommended in the appliance technical
manual.
Riello recommends that the in line and burner oil pump filters
are inspected and if required replaced at least every 4
months during burner use, before the burner start-up follow-
ing a long period of discontinue operation and even more
frequently where contamination has occurred. Particular
attention is needed when inspecting and checking for fuel
leakages from seals, gaskets and hoses.
