SAG has delivered tank systems with internally approved functionality to two different project partners:
- MAN received a tank system with low pressure pump
- Iveco received a tank system with medium pressure pump
Both systems were designed and manufactured specifically for the HDGAS project and meet the specifications developed in the HDGAS requirements document.
The base tank was designed in a way to be compatible with both pump systems (low pressure and medium pressure). By reducing the insulation gap an increase of capacity compared to state of the art tank could be achieved. Test results show that the base tank meets all criterias regarding mechanical stability, life length strength and insulation quality (hold time).
The low pressure pump is a completely new type of pump which is driven by an electrical linear drive. This type of drive has not yet been used in LNG tank systems for trucks and works very efficient under the low temperature conditions of a cryogenic tank.
The medium pressure pump was designed based on pre-studies for a high pressure pump and is driven by a hydraulic piston. Also this pump system can be completely mounted inside the base tank.
By extensive testing it was shown that the functional requirements can be fulfilled by both pumps. Furthermore lifetime testing was performed to gain further information about wear and robustness of sealings and components. Both pump types can be mounted inside the LNG tank completely including the drive systems what allows to maximize the tank capacity for a given mounting space.
Next step is to mount the systems on the corresponding trucks and do real operation testing on the street.
SAG – Simon Berger
View the report: Tank system prototypes by SAG (Public Summary)