We have a tank farm where aviation turbine fuel ( ATF) or jet fuel is stored in the refinery. "Hammer blinds'are being used for positive isolation which will isolate the tanks from the system so that contamination of the product is prevented. Operators of the blinds complain that they find it very difficult to operate ( Physically removing the blinds has resulted back injury) and change the position of the blind each time it is required for On off operations. In order to bring the positive isolation , motorised valves were thought of but it was not approved due to various reasons. I am not sure what HSE means (Health and Safety Executive???)Positive isolation can be obtained with the correct selection of valves. Use a DBB (double block and bleed) valve and you can have the isolation that is required. Think about installing DBB trunnion ball valve or DBB plug valve. Both are often used in tank farms for positive isolation and can be operated by hand. Note: These valves can only be considered as positive isolation when the cavity is monitored or opened to atmosphere. In the tank farms that I have seen, these DBB valves are only periodically tested by opening the cavity port to verify isolation of product.

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