The original transfer line ran above ground and parallel to the train track and was considered by BP worldwide as oneof their most “at risk” fuel lines. Due to the fact of the train and possible derailment rupturing the fuel line and the Emu River also becomes a factor in this and the risk of pollution.
Casing pipes were thrust bored from the North yard to the Eastern side of the pipe bridge over the Emu River. These were at a depth of 3.5m under the rail line and River Road.
The fuel transfer pipes were then inserted into the casing pipes and connected to the existing pipe bridge on the Eastern side of the Emu River and the termination point inside the BP North Yard. This equates to a total overall distance of 48m above ground inside the North Yard and 85m underground from the North yard to the pipe bridge.
Dewatering was a big issue, especially in the ground conditions encountered inside the North yard where the boring pit constructed was 4m deep and located below the water table. Up to 30,000L pumped on a daily basis.
On the river side, VEC had to contend with the environmental issues of protecting the Emu River from any contaminants as well as a myriad of services, including the old and in use fuel lines, water and sewerage lines, Telstra and gas lines as well as an old redundant acid line.
The integrity of the rail line and River Road were also an issue as the casing pipes were bored in underneath them.
The rail and road are all intact and no visible difference has been detected.
VEC also had to contend with the issues that come from working inside an operational fuel plant/depot, such as not using mobile phones as an example.
The thrust boring pit was also deemed a confined space and gas monitoring and the possibility of contamination from spillages as well as the soil, which was found to be under EPA guidelines, all had to be taken into account.
VEC completed the works without any safety, environmental or quality incidents and to the satisfaction of the client.