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sold onto the customer) and it is the efficiency of this system that has made it possible to bring higher levels of vapour management onto the forecourt, with increasing levels of environmental protection and most importantly, hugely improved levels of profitability for the site operator. Total Vapour Solution (TVS) All elements are now in place to make it possible to manage wet stock reconciliation to much higher levels of accuracy. It also allows any shortages incurred during deliveries to be flagged up more rapidly as well as more importantly, leak detection. Collecting and managing the vapour from fuel deliveries means that there is minimal return to the delivery tanker, whilst the vapour is being controlled within the storage tanks and retained by the retailer. The larger the ullage space after a delivery the more vapour there is stored to be processed. It is therefore easier to quantify product losses or variations, in tens of litres as opposed to hundreds or thousands of litres.
With all the vapour now being processed within the tank farm it is possible to calculate wet stock losses far more definitively, as there is much more information available with Total Vapour Recovery and Processing. • The delivery of vapour/air from the dispenser nozzle is a tested and legislatively set measurement of efficiency of between 95 – 105 %. • The closing stock recorded from the tank gauges will include vapour returned to the tank farm as processed liquid and this can be calculated using the following conversion rate of vapour into liquid. • (667 litres of vapour per litre of product dispensed (1.5 litres of liquid /1,000 litres of vapour) With the above conversion factor it is possible to calculate and allocate losses, so we have to give consideration to the indirect delivery of product via the dispensers. D u r i n g n o r m a l operations the processor will be working during the delivery and after to process the retained vapour from the delivery. Once this has b e e n completed it will operate as and when the pressure rises to 3 mbar and switches off at -
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APEA tel/fax 0845 603 5507
2mbar. Therefore, a total time of two hours daily with a delivery or with no deliveries thirty minutes daily. Seasonal variations have to be taken into account but we believe this will give a life of fifteen years before major maintenance need be considered. With larger sales sites of seventeen million litres upwards we recommend two processors to achieve the best efficiency. With this reliability it is possible for us to offer the client a three year warranty on all the equipment. The running costs are very dependent on the clients own situation but these have been calculated to be between £0.65 to £0.95 per day depending upon the number of deliveries. There are three and single phase versions all with ATEX approvals. We try to utilise existing pipe work, so as to avoid disturbance on the forecourt, but some installations do offer higher processing efficiencies due to the sites pipe work. These performances have been achieved and recorded, with independent stock control companies, and have we little reason to believe that it will not be possible on every site subject to the sites infra-structure. In the British Isles and Southern Ireland the Total Vapour Solution (TVS) is being marketed by Petroman Environmental Services Ltd based in Stoke on Trent, Staffordshire. Worldwide sales are being handled by OPW from their offices in Europe but should you require any further information please contact Petroman on the details below: Unit 5 Sneyd Green Business Park, Stoke-on-Trent, Staffordshire. ST6 2NP Tel: +44 (0)1782 200750 Fax: +44 (0)1782 200755 Website: www.petroman.ltd.uk Email: info@petroman.ltd.uk
