Chem Resist take great pride in the initial training and on-going quality checking of our fabricators.  As such, all personnel are tested to the European Standard BS EN 13067 – Approval Testing of Plastic Welders.

With welding being such a critical aspect of Thermoplastic Vessel manufacture, Chem Resist pioneered the development of an in-house welding school.  This enables the training of apprentice Plastic Welders, as well as the bi-annual testing of all of our Qualified Welders, ensuring standards remain consistently high.

Furnished with all the essential welding tools, the welding school also has the necessary equipment to test welds for the required integrity.

Chem Resist fabrications use cord, extrusion and butt fusion welding techniques.  The most appropriate welds are chosen to ensure optimum build integrity.

It is essential to load and unload vessels safely.  At our manufacturing base in Dewsbury we have our own cranes to ensure vessels are loaded in the appropriate manner.

Small vessels can be loaded upright (where height restrictions permit), making loading and unloading straight forward.  Depending on size, these are placed on pallets and manoeuvred with a fork lift truck;

Medium vessels will require the use of a spreader beam, attached to an independent or vehicle mounted crane;

In the main, most vessels are loaded in a top and tail scenario, using two cranes.  For larger vessels the cranes tend to be independent: as shown in the video clip below…

Polypropylene was first polymerised in 1951, with subsequent commercial production in 1957.  It is currently the 2nd most important plastic in terms of revenues. Polypropylene is a very useful material in Thermoplastic Vessel manufacture, where higher temperatures are being used in Chemical Processes, coupled with maintaining excellent Chemical Resistance.

A summary of Polypropylene’s properties are;

• A broad range of chemical resistance
• A specified design life with unlimited fill and empty cycles
• polypropylene pH resistance across the full range
• Suitable for use at higher temperatures
• Compliant with EU Directive 2002/72/EU (Food grade Plastic Materials) and WRAS approved

As technology has progressed, our capabilities have developed to produce the largest spiral wound tanks in the world.

Our tanks range from 800mm to 4300mm, with our unique spiral winding process allowing the manufacture of any diameter within this range.  This gives us an edge, allowing like for like replacement of existing storage tanks, minimising costs associated with civil plinths.  Volumes can be as high as 130,000 litres, with wall thicknesses up to 140mm.

Continued re-investment has delivered a whole range of bespoke mandrills, ensuring vessels which are both aesthetically pleasing and highly accurate in terms of manufacturing to the design standard BS EN 12573, complimented by DVS 2205.