Tokheim QUANTIUM 410, Руководство по установке

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Document Ref 909342-001 Rev 11
Page 2-21
Quantium 410 Installation Manual Site Preparation
SPECIAL INFORMATION RELATING TO HIGH BLEND ETHANOL
FUELS (HBEF) & VAPOUR RETURN (VR) RETURN LINES
Following extensive explosion safety tests with HBEF by PTB, Tokheim
recommends all pipework back to the vapour space of the HBEF storage tank
should be protected by special flame arresters.
The vapour return line to the underground storage tank should be protected in
the event of a vehicle collision with a dispenser and also for maintenance operations.
The flame arrester(s) in the dispenser VR pump do not meet this requirement.
An additional flame arrester must be positioned under the dispenser and must be
protected from potential damage during a vehicle collision so it remains connected
to the vapour return line to the tank in the event that the dispenser is knocked off
the island.
Note : This flame arrester is a requirement of the installation, not a requirement
of the dispenser.
If the Stage II VR return lines are routed back to the HBEF tank then the VR
return line from the dispenser vapour recovery system should protect the tank by
including a flame arrester.
The correct type of flame arrester must be carefully selected:-
• Deflagration or detonation arrester dependent upon its position relative to the
anticipated end of line
• Inline type (unless it can be guaranteed to be at the end of line during maintenance
or after a vehicle collision)
• End of line types will need to be suitable for use with burning alcohol
• Arrester must be suitable for the correct Gas Group:-
- Ethanol blends 60% to 90% require Gas Group IIA Arresters
- Ethanol blends >90% require Gas Group IIB1 Arresters
• Arrester must be manufactured from materials suitable for use with ethanol and
bio-ethanol blended fuels
Tokheim offer two kits for use with Quantium dispensers to fullfil these
requirements, both kits using the inline deflagration flame arrester certified for
use with Gas Group IIB1 thus suitable for all percentage ethanol blends. The kit
must be installed in close proximity to the underside of the dispenser in accordance
with the drawings in this section.
•
The standard kit includes an intentionally weak section above the arrester to
ensure that the device remains on the underground vapour pipe following a vehicle
collision
•
The alternative kit includes a certified shear valve (with poppets) above the
arrester which additionally ensures that the line back to the tank is closed following
a vehicle collision