In last week’s blog post, we gave an overview of the potential problems caused by microbiological growth in closed circuit systems. In this week’s blog post, the fifth in the series relating to BSRIA BG29 2020, we examine the main differences in microbiological test methods and specifications in the new standard in relation to the previous 2012 edition.
Continuing our series of blog posts reviewing the new BSRIA BG29 2020 guidelines, over the next couple of weeks we want to focus on the changes that have been made in regards to the microbiological specifications on sampling. And specifically, the introduction of a five-day turnaround for sulphate reducing bacteria (SRB) testing procedures.
The first blog in this series gave an overview of the main changes/additions in the new 2020 BG29 guide when compared with the 2012 edition. The second blog addressed some of the concerns regarding the use of thin walled carbon steel pipes and the additional sections in BSRIA BG29/2020 relevant to this.
In last week’s blog post, we gave an overview of the main changes and additions in the new BSRIA BG29 2020 guide compared with the 2012 edition.
In this blog post, we focus purely on one new topic in the guide, enabling us to investigate this area in more depth.
The BSRIA BG29 document was first launched as AG 8/91 Pre-commissioning Cleaning of Water Systems in 1991, almost 30 years ago. Many changes have happened in heating and cooling systems since then as we seek to achieve far greater energy efficiencies, resulting in significant differences in how these systems are now installed and operated. Other changes including an increased emphasis on microbiological control and innovations in cleaning techniques. The new sixth edition of BSRIA BG29 reflects these changes.
Now we know what a virus is – how do we kill them?
Last week, we asked: “What is a virus?”. We commented that it is an agent that can cause disease, but it is not “alive” in the classic meaning of life. This time we are going to look at how we can kill it or more accurately, prevent it causing disease and mayhem. This is not only important for human health, but also in agriculture and farming as plant and animal husbandry pathogens can be extremely damaging.
A biofilm will begin to form when free swimming micro-organisms attach to an appropriate surface and produce extracellular polysaccharides. The development of a biofilm can happen on a wide variety of surfaces including inner pipe surfaces, tooth enamel, or even internal medical devices.
In the world of water treatment, corrosion is a major concern. If not controlled, corrosion can lead to poor energy transfer in heat exchangers, creation of favourable microbiological conditions in cooling towers, and even complete failures in steam boilers. Pipework, heat transfer surfaces and externals are all susceptible to corrosion.