Inspections for Thermoplastic Tanks

Freestanding Thermoplastic Tanks are normally fabricated in Polypropylene or High Density Polyethylene.

Non-destructive testing methods for thermoplastics tanks are very limited. 

Spark testing is not appropriate and ultrasonic testing on thermoplastic tanks is not currently available; therefore it is vital that the inspector is a competent and experienced person.

See the HSE’s ‘advice to user’ guide PM86 for thermoplastic tanks for independent recommendations on inspection techniques as well as the timing and extent of inspections.

EXPERT visual inspections,
ASSESSMENT & reporting

All our Tank Inspectors and Site Engineers are from a tank manufacturing background with extensive experience in the manufacture of thermoplastic, GRP and ‘Dual Laminate’ tanks.

Inspectors are backed by experienced design personnel and material testing facilities. 

Our team has a wealth of experience and knowledge backed by over 40 years in the plastics tank field.

Tank inspection personnel have been involved in the technical committees for BS4994, EN13121 and EEMUA225.

Full visual inspection 

  • Diameter Measurements – to check for Bulging or Stretching
  • Visual Check for any signs of Shell Deformation
  • Close inspection of welds for signs of cracking and weakness


other testing

Dye penetrant test

It may also be recommended that a dye penetrant test is carried out on welds to further highlight any stress cracks. 

Increased inspection frequency

Where concerns are raised an increased inspection schedule can be used to log movements and change in the tank shell.

Repairs and replacements

We may recommend that any areas of tank weakness are addressed for instance by removing existing welds and re-welding. 

Our inspectors follow the procedures set down in EEMUA 225 (Above Ground Plastic Tanks – A guide to their specification, installation, maintenance, repair and disposal.). Tank Inspections Ltd. was involved in the workgroup for EEMUA 225.

Get your tank tested