AirVAXX 4000 Litre Capacity Skid Mounted (Twist Lock) Vacuum Tank

Vacuum Tank Specifications

Pitting corrosion in Stainless Steel Vacuum Tanks

A common misconception among vacuum tanker operators is that stainless steel doesn’t corrode.

Like all metals, stainless steel will corrode under certain conditions.

DPI Inspection of a Stainless Steel Vacuum Tank

Recently, we were asked by a client to inspect a stainless steel vacuum tank that was leaking through the tank wall. Internal inspection of the vacuum tank using dye penetrant inspection (DPI) revealed that the inside surface of the vacuum tank had been severely damaged by pitting corrosion.

In the image below you can see the small pin holes we found in the stainless steel wall of the vacuum tank.

Pitting is a localised form of corrosion which can occur as a result of exposure to specific environments, most notably those containing chlorides.

The passive layer on stainless steel can be attacked by certain chemicals. The chloride ion Cl- is the most common of these and is found in everyday materials such as salt and bleach. This vacuum tank was manufactured from a 304 grade stainless steel that was known to regularly carry waste liquid containing sodium chloride in solution.

It was concluded that the chloride ions present in the liquid waste most likely contributed to the pitting corrosion found inside the stainless steel vacuum tank.

The pitting corrosion was weld-repaired using a qualified weld procedure and qualified welder taking care not to damage the metallurgical properties of the original stainless steel plate. 

Pitting corrosion is avoided by making sure that stainless steel does not come into prolonged contact with harmful chemicals or by choosing a grade of steel which is more resistant to attack

Take care selecting the correct grade of stainless steel for your next vacuum tank application.  Please contact us if you require assistance.

AirVAXX In-Tank Heating System

The AirVAXX In-Tank Heating System is designed to prevent solidification of fatty waste products.

A heat exchanger tube bundle inside the vacuum spoils tank transfers waste heat from the vehicle exhaust to the fatty waste thereby reducing the waste's liquid viscosity in transit.

Maintaining a reduced liquid viscosity ensures the product can be easily discharged from the vacuum tank.

Contact us for more information...

Tank Container Inspection & Maintenance

When Eurotainer contacted us to undertake inspection and maintenance services on their range of LPG Tank Containers, we knew that we were about to embark on a mutually rewarding relationship.

Our specialist technicians ensure the assets owned by Eurotainer are tested and maintained to the highest safety and quality standards.  Inspection and testing work for LPG Tank Containers is conducted at 2.5 and 5 yearly intervals in accordance with the International Maritime Dangerous Goods Code (IMDG).

 

Air & Gas Industries has been providing pressure equipment inspection and maintenance services for the gas and waste industries for more than 40 years.

Please contact us should you require service and maintenance on your pressure equipment assets.

Single-Axle Skel Trailer

Air & Gas Industries has delivered another single-axle skel trailer.

Coupled to prime-mover with a loader crane, this single-axle skel trailer provides a perfect platform for wide-span loads requiring tight manoeuvring on job sites.

Another AirVAXX packed and shipped to WA...

There it goes !...

Air & Gas Industries sends another delivery to WA.

This AirVAXX S-25 is built tough for the harsh and punishing environment of rural Western Australia.

The unit will spend the next 20 years safely transporting regulated waste liquids and sludge from mines and rural industrial sites.

Multi purpose waste tanker body...

Our AirVAXX 3000L Combination Vacuum Tanker with Pantec Style Body, Side Access Stairs, Side Roller Door and Rear Opening Tailgate.