Case Studies

Disposal of Hazardous Waste at Petroleum Refinery

Tank Cleaning

Completion Date: September 2015

Challenge: A large mid-stream refinery was faced with having to de-commission one of their 1900’s riveted aboveground storage tank. Recurring maintenance cost and increased environmental and safety concerns dictate that older tanks be replaced with new, state-of-the-art storage tanks. The tank was 115’ diameter x 35’ high in Naphtha services which contained cat feed. The Refinery was concerned of staying on budget due to possible landfilled taxes, disposal cost, and the sludge being classified as hazardous waste. This refinery challenged Evergreen to remove 10’ (28,000 BBLS) of in-situ sludge and complete the final cleaning.

Solution: With comprehensive planning Evergreen set up the project for success from the start. Evergreen management team found a place to dispose of the hazardous waste and arranged transportation for the 28,000 BBLS of in-situ sludge. Evergreen provided the refinery an oil volume credit for the in-situ. Evergreen’s onsite personal furnished Basic Sediment & Water (BS&W) for each transported load and documentation of logs and files for future reference. Once all 28,000 BBLS of the in-situ sludge was safely removed from the site. Evergreen personal installed Coppus blowers on the manways, ventilated the vapor space, and requested a confine space entry permit in order to complete the final cleaning under appropriate respiratory controls.

Benefit: The budgeted timeline was shortened due to the removal of 900 BBLS of in-situ sludge with tanker trucks. The trucks where managed by Evergreens onsite personal. The refinery received an oil volume credit for the in-situ sludge which reduced the project’s cost an estimated 64%.

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