CRA has been registered by PUB, Singapore’s National Water Agency, as an approved vendor for Waste Gas Burners and Biogas Accessories. The registration follows a technical review tied to the enclosed ground flare we are currently delivering at the Changi Water Reclamation Plant, under Jacobs’ consultancy.

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The Approval

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PUB is Singapore’s national water agency, responsible for the country’s water supply, used water reclamation, and stormwater management. It operates one of the most advanced water reclamation networks in the world, including the Tuas, Changi, Kranji, and Ulu Pandan plants, and the NEWater system that supplies a significant share of Singapore’s water demand.

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PUB’s approved vendor register is the formal entry point for equipment supply into any of its assets. The bar is high. For Waste Gas Burners and Biogas Accessories, the categories CRA is now registered under, the list is short, and inclusion requires evidence of design capability, manufacturing quality systems, and delivered field performance.

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The Changi Project

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The project that closed our registration is the enclosed ground flare we are currently delivering at the Changi Water Reclamation Plant, Singapore’s largest WRP and the anchor of the DTSS and NEWater network. At Changi, biogas is generated continuously through anaerobic digestion of municipal sludge. When the gas cannot be utilised, it has to be destroyed in a way that satisfies Singapore’s NEA emission limits, the urban surroundings of the site, and the operational reliability standards PUB applies to its core infrastructure.

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CRA is supplying a 1,450 Nm³/hr enclosed ground flare designed for greater than 99% destruction and removal efficiency on biogas of variable composition. The system is fully automated, with continuous pilot reliability, BMS-driven interlocks, and a footprint sized to fit within an operating PUB asset where there is no spare real estate.

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Several design constraints apply at the site. The digester gas composition is variable — methane content shifts with feedstock and digestion cycle, and the burner has to maintain stable combustion across the full operating range without manual intervention. The site is tropical and coastal, so material selection for the burner tip and combustion zone has to account for thermal cycling and sulphidation in a humid environment. Singapore NEA emission limits are strict, which means burner geometry and flame retention have to be engineered and verified, not assumed. The flare is enclosed, so there can be no visible flame, the exit temperature has to be controlled, and acoustic performance has to suit an urban-adjacent setting. Availability has to be high — biogas flow does not pause, so the BMS, interlocks, and start-up sequences run continuously without dependence on operator attendance.

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The technical review of CRA’s scope was conducted under Jacobs, the lead consultant on the Changi works. Jacobs’ role on PUB projects is the same role they perform for major water clients globally: they set the engineering standard the project is held to, and they decide which vendors clear it.

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For CRA, the review covered design basis interrogation against PUB’s specification and ISO 20675, manufacturing-level QA/QC documentation, drawing approvals at design freeze and pre-fabrication stages, reference plant validation across delivered units in comparable service, and FAT planning and inspection protocol agreement. Every gate had to close on its own merits before the registration could move forward.

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CRA’s Work in Singapore

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The Changi approval builds on a sequence of projects CRA has delivered or is currently delivering into Singapore’s water and research infrastructure. Tuas WRP, biogas moisture traps. Kranji WRP, pressure relief valves and flame arrestors for gas piping protection. Ulu Pandan and NEWRI, enclosed biogas flare, delivered and in operation. Changi WRP, 1,450 Nm³/hr enclosed ground flare, currently under execution. Five projects across three equipment classes, all in an operating environment that holds vendors to one of the more demanding bars in the region.

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What’s Next

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Singapore is entering a heavy tendering phase across its water infrastructure. The Changi WRP Extension, the New Kranji WRP, and the Tuas Nexus integrated facility together represent one of the most concentrated wastewater infrastructure pipelines anywhere in the world. Each will require biogas destruction, gas conditioning, and gas safety equipment to be specified at tender stage.

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With the PUB registration now in place, CRA can be specified directly into those bids — both as an approved supplier post-award and at the design and specification phase, where the engineering decisions actually get made.