Simple switch to safer solvent

Solvac 3
Solvac 3

Fraser Technologies’ managing director, Graham Fraser discusses how his company has helped BAE Systems make the change to a safer solvent.

Due to legislation around the safe use of normal Propyl Bromide (nPB), any business still using this solvent in its cleaning and degreasing process must find a replacement.

Also known as solvent 1-bromopropane, nPB, has been registered as a Substance of Very High Concern (SVHC) under REACH, which regulates the supply and use of chemicals in Europe. As such, nPB was placed on Annex XIV, and its use was officially banned in July 2020, unless an authorisation has been granted and the business has a permit for a specific use.

In 2017, we worked with BAE Systems to replace the nPB it was using with a safer solvent. BAE Systems approached us to assess its existing process to see how it could use an alternative solvent which would be safer, at which point we also discussed additional benefits including efficiency and cost saving.

To assess BAE’s existing cleaning processes, we arranged a site visit to inspect the Solvac Systems at two of its facilities. We performed a full system inspection to ascertain the suitability of the systems for conversion to Opteon SF79. Opteon SF79 was chosen because of its cleaning performance, ultralow GWP, recyclability and reusability, safety and ease of use.

As part of the process, our objectives were to test the equipment for suitability and compatibility for use with SF79, as well as the general condition of the equipment and any opportunities to reduce solvent usage. BAE found that its solvent usage was very high and was aware that reductions would improve its environmental impact and save costs.

Before using nPB, both of BAE’s systems were originally supplied for use with Trichloroethylene (Trike) to flush pipework, so they were long narrow tanks specifically suited to this application. They each had a flushing rig and filtration, and originally had carbon absorption desorption systems fitted.

The existing Solvac systems used more than 1 tonne of solvent per year, meaning BAE required a permit from the local authority for continued use, further increasing its costs.

Due to the legislation around the safe use of Trike and nPB, these systems were fitted with over tank canopies and safety interlocks to ensure operators were not exposed to solvent vapours. One of the systems also had a PPM meter fitted, which restricted the front door from opening until the level of solvent had dropped below a specified level. This, as well as additional safety features, protected operators and reduced emissions.

The meaning of cleaning

While there were minor issues with the system, these could be addressed and it was determined that Opteon SF79 was a suitable replacement. This has now been fully implemented at two of the locations, while the third is currently transitioning to the new product.

Since moving to Opteon SF79, BAE has achieved the cleaning performance they expect, while also significantly reducing its environmental footprint. As SF79 does not have the acidity issues that nPB does, BAE’s usage was significantly reduced simply because fewer clean outs were required. And importantly, it is safe and easy for operators to use.

Speaking about the results of the change to SF79, BAE’s Engineering & Governance Lead said: “The transition from nPB to SF79 was relatively straightforward and quick, and communication was good throughout. Fraser Technologies also had a much stronger relationship with the manufacturer than we did, which was especially helpful during the process.

“Due to a reduction in manufacturing throughput, we cannot confirm an exact reduction in annual usage, and therefore cost savings and environmental footprint. However, emissions monitoring that we undertook following the introduction of SF79 showed a reduction in volatile organic compounds to atmosphere compared with the previous solvent. The product’s lower GWP will also contribute to reducing the environmental impact of our site operations.

“Overall, changing to SF79 has been a positive experience and it has helped us to achieve our safety, health and environmental objectives.”

www.frasertech.co.uk

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