Sludge and water in an oil tank: symptoms and remedies

Detail that affects your quote for sludge in an oil tank

• A tank outlet fitted slightly above the base avoids some sludge
• Water-finding paste confirms free water in minutes
• Repeat filter blockages within weeks indicate tank contamination
• Steel tanks corrode from the inside outwards once water sits
• Bunded replacement tanks are required in many situations

Where sludge in an oil tank usually comes from

Water enters as condensation and through poorly sealed lids and vents. Micro-organisms live at the oil-water interface, producing a dark sludge that migrates into the supply line. Symptoms are repeat nozzle blockages, short filter life and lockouts that resolve briefly after a filter change. Confirmation is a water-finding paste test and inspection of the tank base.

Where we deal with this

• North Bradley (BA14) · 11 mi
• Swainswick (BA1) · 10 mi
• Norton St Philip (BA2) · 6 mi
• Stratton-on-the-Fosse (BA3) · 4 mi
• Pilton (BA4) · 8 mi

Questions we get asked

Can a tank be cleaned rather than replaced?

Sometimes, if the tank is structurally sound. Corroded steel tanks are generally beyond economical cleaning.

How long do plastic tanks last?

Manufacturers typically indicate 10 to 20 years depending on model and exposure — UV and ground movement are the enemies.