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RMS Proving Two Goes into Three

The growth of metered estates, which involves high capital cost, is good for the industry, but fitting the right equipment is essential. A single property losing its supply is not good news, but callouts become more serious when dozens of properties may be affected at the same time.

A reliable regulator setup with good repeatability and long life is essential, and incorporating a standby supply stream gives added protection. Twin stream units are an assembly of two independent regulated legs set at slightly different pressures. If the active stream fails and over pressurises, the OPSO will shut down the faulty leg and allow the monitor stream to take over. Suitably positioned check valves ensure that the streams remain isolated and do not interfere with each other.

“RMS embarked on producing a small range of first stage twin stream modules three years ago,” said Peter Roberts of RMS. “The design was innovative in that it included swivel joints in all corners, allowing for vertical and horizontal installation. Since then, much has changed and the market has become more sophisticated in its demands.
“As a result, the range of assemblies available has risen to 15 and includes first stage and second stage units for above and below ground tanks. Underground tank units are supplied with surface mounted kiosks, and above ground tanks use Unistrut stands to raise the assembly and prevent liquefaction.

“Perhaps the most significant change to the designs has been the adoption of Clesse regulators. These provided the capacity and flexibility to meet almost every need, but higher demands raised issues of the unit size and ease of installation. All the pundits will tell you that two-stage regulation is a must; that reducing from tank pressure to 75mb in one cut will be troublesome.

“Modern design and production methods have proved this is no longer the case. As an OEM distributor, RMS has collaborated with Clesse UK and Calor Gas to design and build single cut units. A considerable number have been installed and are performing faultlessly.

“The 40kg units are compact enough to build in two stages and fit inside a standard 700 x 450 x 800 kiosk. Above this capacity, the low-pressure pipework needs to be a minimum of two inches so the unit size for a combined two-stage twin stream would be totally impractical.
“Clesse’s single cut regulator gets over this problem,” said Peter. “By clever orientation, an assembled single cut unit with a capacity up to 200kg/hr fits in the same size kiosk. It has the added benefit of being suitable as a second stage unit where the site is set up with medium pressure distribution pipework. The benefits of cost saving lower maintenance and compact installation are evidence to the wisdom of this route.

“So remember, if you are considering three-stage regulation down to 37mb, there is another way. With the right choice you can do it in two.”

Picture: Single cut twin stream without kiosk.

Contact RMS on 01792 224000 www.rmsgaseng.com