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How to Abandon Indoor Oil Tanks & What to Do About Abandoned Indoor Oil Tanks
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• What to do with abandoned indoor oil tanks
• How to abandon an indoor oil tank; how to use up the heating oil in an old oil tank\

How to inspect indoor and above ground oil tanks, and how to handle abandoned indoor oil storage tanks. The photo shows a rather old indoor oil tank which is still connected to a fill and vent pipe. The tank was leaking badly enough that it may have been abandoned but left in place. If it is not in use, there are some critical steps to be taken to avoid an indoor oil spill and catastrophe, such as having the tank receive an un-wanted oil delivery that could leak into the building.

The article and photographs below give advice and example photos for the visual inspection of above ground oil tanks for leaks and damage including damaged or leaky oil storage tanks, improper oil tank piping, valves, and indoor-type oil tanks located outdoors.

Here are a some important indicators of tank condition that any home owner or home inspector can examine when an oil storage tank is visible and accessible inside or at a building.

Also see additional visibly detectable oil tank defects listed at Home Inspection Report Language Library: Visible Defects in Oil Tank Installations, Tanks, and Heating Oil Piping.

© Copyright 2009 Daniel Friedman, All Rights Reserved. Information Accuracy & Bias Pledge is at below-left. Use links at the left of each page to navigate this document or to view other topics at this website. Green links show where you are in our document or website.

ABANDONED & ABANDONING INDOOR OIL TANKS - Inspecting Properties Where There are Known or Suspected Abandoned or Removed Indoor Oil Storage Tanks

Have all abandoned tank fill pipes been completely removed from the building to prevent mistaken delivery and spill into the building? Have old indoor tanks been removed or marked clearly as "Abandoned, DO NOT FILL" ?

Warning about un-used indoor oil tanks and surprise oil deliveries

Warning about un-used oil tanks at buildings: there have been instances of accidental delivery of oil to buildings where indoor or above ground outdoor tanks remained, or worse, where the tanks were removed but the fill and vent pipe were not. In New Paltz, N.Y., S.V. reported (to the web author, DF) such a case. An indoor oil storage tank had been removed.

The fill and vent pipe remained to be removed from the house wall. The builder, in an effort to be cautious about an improper oil delivery, turned the fill pipe upside down at the house wall and even nailed plywood against the building to cover the fill pipe as the home waited for the pipe to be removed and the hole in the foundation wall filled.

A neighbor called the oil company on a very cold night, complaining of loss of heat, and fear of freezing pipes. The call resulted in a request for an emergency delivery of heating oil. Unfortunately the driver found the wrong home, pulled off the plywood, and intending to respond to an emergency on a very cold night, proceeded to pump a large volume of heating oil into the basement of the home.

The result was a very costly cleanup of the building.

If an indoor oil tank is removed or is no longer in use and is going to be removed, or even if it is going to be left in place, the fill and vent piping should be removed to prevent an accidental fill-up and a possible oil spill.

Tips for Using up the Heating Oil in an Oil Tank to be Abandoned

Presuming that a property owner has decided to switch to some other source of building heat, or to a new oil tank at a new location, how do we make the best use of the oil remaining in the old oil tank which is to be abandoned?

If You are Installing a New Oil Tank to replace the old one

• Pump old oil into a new tank: If a new heating oil tank is to be installed, the oil company can simply pump your old heating oil into the new tank.
  • Take care not to pump sludge and water: You will want the oil company to take care not to pump water or sludge from the old oil tank into the new one. That's not so difficult as the water and sludge tend to remain at the bottom of the oil tank except when they're stirred up during a fresh oil delivery. Also see OIL TANK WATER CONTAMINATION and OIL TANK SLUDGE.
  • If the sludge and water have been stirred up in an old oil tank because of an oil delivery into an empty or nearly-empty oil tank, we recommend that you turn off your oil fired heating equipment and wait an hour or two to let things settle down. If you do not let the sludge and water settle back to the tank bottom, the risk is that you'll pull these materials into the oil filter or oil burner, causing clogging and loss of heat.

If you want to abandon the Indoor Oil Tank, for example when converting to gas or electric heat

• Use up the oil in the old tank:
  • If your oil tank piping lines come off of the top of the oil tank and are properly installed the lines won't pick up the sludge, water, and last few inches of oil in the tank. Also see OIL TANK WATER CONTAMINATION and OIL TANK SLUDGE.
  • If your oil tank piping lines come off of the bottom of the oil tank and you run it out there is the risk of pulling sludge and crud into the oil filter, oil burner, and losing heat if those components clog. If the oil burner shuts off in that manner, it'll indeed be shut off firmly until it's repaired, so don't try this if you're still depending on the oil heat to keep working (say to avoid freezing).
• The old oil tank may still need to be pumped out if there's oil remaining in it - lest you get a messy leak and spill later;
• You may be able to leave the old oil tank in place, but we recommend that above ground oil tanks be removed.
  • Remove the fill and vent pipes from the abandoned indoor oil tank and plug those openings to avoid smelly fumes. Leaving the old pipes in place risks an un-wanted oil delivery and possible oil leaks from the old tank, as we discussed at Warning about un-used oil tanks.
  • Notify your oil company to stop making deliveries

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OIL TANK CHECKLIST This oil company's checklist they give to their delivery drivers and which is then completed and passed on to homeowners summarizes the oil industry's views of leaky oil tank warnings.

HEATING OIL EXPOSURE HAZARDS, LIMITS
HEATING OIL SHELF LIFE
OIL TANK ABANDONING PROCEDURE
  INDOOR OIL TANK ABANDONMENT
  OUTDOOR TANK ABANDONMENT
  OIL TANK BANDONMENT REGULATIONS
  AVOIDING CAVE-INs at OUTDOOR OIL TANKS
  REMOVING OLD FUEL FROM OIL TANKS
  OIL TANK REGULATIONS about oil tank abandonment, spills, leaks, cleanup

• Thanks to Alan Carson and Bob Dunlop, Carson Dunlop, Associates, Toronto, for permission to use illustrations from their publication, The Illustrated Home which illustrates construction details and building components. Carson Dunlop provides home inspection education, publications, report writing materials, and home inspection services. Alan Carson is a past president of ASHI, the American Society of Home Inspectors.

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More Information on Building Diagnostic Inspections and Repairs

• Oil Tanks - The Oil Storage Tank Information Website: Buried or Above Ground Oil Tank Inspection, Testing, Cleanup, Abandonment of Oil Tanks
• Abandon a Buried Oil Tank, How To - Abandoning Commercial Underground Tanks, Russ Brauksieck, ASHI Tech. Journal, Vol.3 No.1 Spring 1993, P. 40-41 [Reprint]
• Above Ground Oil Tanks: Visual Inspection of Oil Storage Tanks for evidence of leaks, damage, improper piping - photos and text
• Above Ground Oil Tanks Checklist, an Oil Company's advice
• Above Ground Tanks UL Standards, UL Tank Listing Standards, guidance for home owners, buyers, and inspectors
• Buried Oil Tanks - Finding How to Find Buried Oil Tanks and "Nearly Hidden" and Leaky Oil Tanks - photos and text.
• Buried Fuel tank - Advice - Buried FUEL Tank - GAS or OIL advice for home buyers, inspection report language
• Environmental Issues & Regulations for Oil Tanks, Registration, Abandonment, Leak Reporting
• Home Inspection Report Language Library: Buried Oil Tanks, Basic home buyer advice - home inspection report language suggestions
• Home Inspection Report Language Library: Visible Defects in Oil Tank Installations, Tanks, and Heating Oil Piping
• Home Inspection Report Language Library: Gas Fuel Piping or Tank Faults Basic advice - home inspection report language suggestions
• Home Inspection Report Language Library: Oil Tanks text file list © Oil and Other Storage Tank Leaks, Testing, Abandonment, Inspection - UST home inspection report language files - Reference List
• Indoor Environment Website Indoor Building Environmental Hazard Detection, Testing, Repair, & Prevention - Main Web Page
• Leaky Heating Oil Tanks - Advice for Home Owners or Buyers: caused of leaks in oil tanks, oil tank testing alternatives, what to do about leaky tanks: D.J. Friedman, ASHI Tech. Journal, Vol.2 No.1, Winter, 1992 p. 42-43 Illus
• Leak or Failure Rates for Home Heating Oil Tanks
• Legal Issues Regarding Buried Oil Storage Tanks K.S. Rea, Attorney, summary from ASHI Chapter Seminar.
• Primer on Petroleum Bulk Storage Tanks & Petroleum Contamination of Property Paul H. Ciminello, ASHI Tech. Journal, Vol.3 No.1 Spring 1993, p 35-39
• Petroleum Bulk Storage J. Sibblies, NY State DEC, Advice to Home Owners and Home Inspectors about Oil Storage Tanks - summary from ASHI Chapter Seminar.
• Septic Tank inspection, testing, diagnosis, repair
• OIL TANK FAILURE CAUSES - Oil Tank Failure Causes - oil tank leaks are caused by corrosion, damage, soil conditions, other factors
• TANK FAILURE RATES - Oil Tank Failure Rates - Oil Tank Leak Probability as a Function of Tank Age, Location, Condition, Soil Conditions and Other Factors
• OIL TANK TESTING - - How Oil Tanks are Tested for Evidence Leaks, of Current or Previous Oil Spills
• National Association of Oil Heat Service Managers, PO Box 380, Elmwood Park, NJ 07407
• "Homeowners Guide to Fuel Storage," Agway Energy Products, Verbank, NY, November 1990
• Web Link Exchange: Contact Us to list your website or contact information for oil tank testing, tank corrosion research, oil industry experts

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