T his can make a big diff erence to the bottom line at a large scale cooling operation. Improvements in technologies involving heat exchangers, compressor controls and low-pressure receivers have allowed the charge size to be reduced and this in turn lowers the risk of leaks. Importantly, ammonia – even in small quantities – h as a recognisable odour which can be viewed as its greatest single safety asset. A s with any refrigerant, safety is a key issue and you would not dream of i nstalling a new system without ensuring that all the checks and balances are in p lace before work begins. We take safety very seriously at J&E Hall and before starting any job we take a long, hard look at what’s needed on an individual basis for each installation.
J&E Hall designs, manufactures and installs ammonia-based refrigeration s ystems. The company employs cutting-edge technology and some of the fi refrigeration brains in the world to build and install the best systems. J&E Hall has a fi ne track record with ammonia installation and we off er a bespoke package of m easures to customers to ensure that all is in place safety wise before work begins. With systems now capable of running on only a few kilograms of ammonia, the potential for leaks can be controlled easily. As with any refrigerant it’s all a matter of understanding that risk. Refrigerants are not bad in themselves – its how you handle them.
d some of the finestfi
The J&E Hall safety package off ers a bespoke risk assessment for every i nstallation. Before any work takes place we visit the site, speak to the managers, operators and maintenance engineers, and from these discussions complete a full risk assessment for the customer. This gives them a true picture on what to do to keep the site running efficiently and how to react in an emergency.
We also off er training where we sit down with managers and staff to explain w hat happens on site – this includes every aspect of the system – to ensure that t hey understand fully what’s involved in working with ammonia. They be may c onsidering installing a glycol-based secondary system and so its important to provide a clear and detailed insight into how this dovetails with the ammonia package.
Ammonia has a fi ne safety record when installed and maintained correctly. It is necessary that installers and operators of ammonia-based systems be made aware and work to the safety legislation put in place to protect them and the public. This includes the Provision and Use of Work Equipment Regulations 1998 (PUWER), the Pressure Equipment Regulations 1999 (PER), the Pressure Systems Safety Regulations 2000 (PSSR) and the Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR).
At J&E Hall we provide all the assistance needed to help customers cross these bridges safety wise, and make the most of their ammonia package.
For the customer, employing ammonia in a system will require a new set of skills for their staff but most in-house maintenance teams, with the right support and training, will be able to manage this competently.
There are new technical aspects to consider too. In many of the places where J&E Hall has installed ammonia systems, there has been the need for steel piping. Breweries are a good example of this. The valves may diff er too but with the right training, maintenance teams can soon understand all that’s required to keep the system running smoothly. We also ensure that the system has isolation valves to provide back-up when necessary.
With the F-Gas stepdowns now fi rmly in place and supplies of virgin HFC gases, particularly those with high GWP ratings, in short supply, it’s a good time for some end-users to consider switching to an ammonia system. It’s a naturally occurring material and this gives it a huge advantage over other gases.
From my point of view, its efficiencies and environmental properties make it a superb choice for a refrigeration system where cooling is needed on a large scale. The key to success is to ensure that the system is installed and designed correctly, and that the people using it are well trained and fully up to speed with all that’s needed safety wise.
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