Rotokawa Upgrade Project


Project

To maximise generation at both the Rotokawa and Nga Awa Purua Geothermal Power Stations by modifying the existing steamfield systems to address the declining field enthalpy.


Objective

Optimise generation capabilities for both the Nga Awa Purua (137MW triple flash plant) & Rotokawa RGEN (34MW Ormat Binary Plant) Geothermal Power Stations

 
Rotokawa upgrade project
 
 

Project type
Design + Construction Support

Client
Mercury NZ

Plant
Geothermal

Location
Rotokawa, Taupo New Zealand

Date
Dec 2019 - Dec 2020

Software
AutoPIPE, Micro Station, NozzlePRO, Memdes, Solid Works FEA

Partners
Tesla Consultants, Dobbie Engineers & Sigma Consulting

Codes/standards
Civil Works: AISI, NZS, AS/NZS, NZTA/TNZ
Mechanical Works: ASME/ANSI, ASTM API, NZS, NACE
EC&I: IEC, IEEE, AS/NZS
Quality Systems: ISO


MB Century

MB Century, having provided the Concept Design and FEED study, was tasked with the Detailed Design of this Steamfield optimisation. MB Century, as the Principle Contractor, facilitated coordinated design and hazard reviews, developed steam blow procedures and commissioning pholisophies. Our deliverables included 3D modelling, fully detailed construction drawings and Bill of Materials. In addition MB Century provided design engineering support during the construction and commissioning phases.


Responsibilities

  • Project Management of design process

  • Supply of Engineering drawings, calculations & specifications

  • Execution & facilitation of safety assessments & design studies (HAZOP, DDR, Operability / Maintainability and Constructability Reviews)

  • Preparation of Commissioning philosophies / plans

  • Preparation of Steam Blow procedure

  • Process design, mechanical design, civil / structural design (by others), EC&I design (by others)


Project outcome

Project implementation resulted in redistribution of geothermal resource between Nga Awa Purua and Rotokawa Stations that increased electricity generation. This change has resulted in an additional 5MW of generation.

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H2 Project

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Geothermal Steamfield Design – Muara Laboh SS1