SLURRY TREATMENT | TECHNICAL
For contractors, it is highly recommended to
consult with STP experts via experienced suppliers or independent consultants. With their training, experience and expertise, the STP experts can provide support to alleviate many challenges before they have a chance to occur. In many cases, these STP expertise should be used prior to the bidding process. Planning billion-dollar projects in a desired range of
costs is a huge challenge itself but making some profit is an even bigger one. Therefore, it is essential to know the influencing parameters on costs for a STP. The project costs can be categorised into equipment,
civil works, transportation, assembly, operation, and demobilisation. It is essential to calculate the expenses for each category accurately to establish a reliable budget. A precise budget can then be used to monitor the expenditures throughout the implementation of the project. It is also advisable to consider possible contingencies and allocate funds accordingly to avoid unbudgeted, unexpected expenses.
REFURBISHING STPs The basic philosophy is to extend the useful life of the product. Refurbishment is predominantly considered to be a ‘full maintenance’ and ‘repair or replace defective functions or parts’ procedure, followed by a final functional test, including full test documentation. Herrenknecht has been refurbishing STPs since 2005, being one of the first companies on the market to offer this service. Typical projects for refurbished products are
projects without demanding, special challenges, employing machinery that successfully completed a comparable prior project. No upgrade is needed, except exceptionally. After successful completion of a tunnelling
project, systems or subassemblies are employed on a different project and to the original configuration of the equipment or with only minor modifications. To ensure economic benefits for both customers and the manufacturer, any necessary modifications need to be kept to a minimum, meaning that clever engineering of machinery – like with modular, container concepts – brings advantage.
GOING STEP-BY-STEP Refurbishment is typically applicable for all projects as Herrenknecht’s STP components are standardised and mainly container modular. This allows equipment to be easily adapted or can be down- or up-upgraded for the next project. Basically, the holistic refurbishment process can be
separated into six steps in the workshop: 1. Disassembly 2. Cleaning 3. Evaluation/ Inspection Process 4. Reconditioning
5.Workshop Re-Assembly 6. Final Test and Quality Check
Top: Cleaning works of a container structure before inspection Centre: Transfer to the workshop of container modules for access and inspection Above: Refurbishment, welding works of pipeline
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