Armstrong Chemtec Group, having its parent company, Armstrong Engineering Associates, Inc., in Pennsylvania in the U.S.A. and its wholly owned subsidiary, Chemtec UK Ltd., in Beith in Scotland, is specializing in Process Heat Transfer.

For over 70 years, Armstrong Chemtec Group has been designing and manufacturing heavy duty industrial equipment for some of the most demanding and hazardous processes in the Chemical, Petrochemical and Oil Refining Industries and has supplied the same globally.

Direct Steam Heated Vaporizers of horizontal shell and coil construction for Hydrocarbons, Cryogenic and Hazardous Fluids:

For cryogenic applications Armstrong Chemtec Group offers Direct Steam Heated Vaporizers of horizontal shell and coil construction.

The vaporizing process fluid passes through the inside of the coil and the steam, used as the heating medium, is in the shell. This type of construction is normally offered for fluids such as Ethane, Ethylene, Nitrogen and frequently Hydrogen Chloride. However, the possibility exists to use Armstrong Chemtec Group’s shell and coil units for other fluids boiling at temperatures less than the freezing point of water. Armstrong Chemtec Group’s unique equipment is designed and proven free of freeze-up problems for process fluid boiling temperatures as low as the atmospheric boiling temperature of nitrogen (-190° C/ -320° F). Many of such units are in olefin process service and fall into either of the following applications, each of which demands high reliability.

• Flare Vaporizers

• Process Liquid Vaporizers

Armstrong Chemtec Group designs have been proven over many years of successful operation. Significant design considerations include the following;

• Response Time - Units are very responsive, i.e. able to adjust more or less immediately to process changes from 0 to 100% of design load.

• Flexible Coil Construction - This produces minimum levels of thermal stress and minimum potential for fatigue failure.

• Freeze Proof Construction - Steam condensate is maintained well above the freeze point of water by proper deployment of internals, proper venting of inerts, and proper removal of steam condensate.

• Materials of Construction - These include carbon steel, various 300 series stainlesses, nickel alloys include Inconel 600 and Incoloy 825, and many other weldable materials suitable for specific design conditions.

Vertical Bayonet Vaporizers:

Armstrong Chemtec Group designs and manufactures Vertical Bayonet Vaporizers used to generate vapor from materials stored as liquids but used in downstream processes as vapor. These most frequently use steam or hot water as the heating medium, for which the vaporizer construction offers a degree of built-in protection against freeze-up. In addition to steam and hot water, other heating media include glycol-water mixes and various commercial heat transfer fluids. The vaporizing process fluid is in the shell and the heating medium passes through the tubes. Armstrong Chemtec Group has built approximately 4,500 Vertical Bayonet Vaporizers for hundreds of process fluids. Some of the more common applications are as listed below;

As for Chlorine, Armstrong Chemtec Group of Companies are members of the Chlorine Institute and Euro Chlor and have capability to meet their specific requirements.

Armstrong Chemtec Group has supplied over 1,000 Chlorine Vaporizers over the years. Not specifically listed are vertical bayonet Regenerant Vaporizers used in widely licensed refinery regeneration processes.

Armstrong Chemtec Group manufactures Vertical Bayonet Vaporizers using Carbon Steel, Various 300 Series Stainlesses, Nickel Alloys including Monel and many other weldable materials. The unique bayonet (tube in tube) construction first used by Armstrong for this application gives rise to a number of advantages as compared to other types of vaporizing equipment.

• Freeze Protection - Of importance for steam heated units is that the condensate is warmed by the incoming steam, thus providing a measure of freeze protection. - Holdup Volume - The retained volume of hazardous process liquid is low relative to alternative designs. - Capacity Control - The liquid level and vaporization rate are self regulating with downstream demand, thus simplifying controls.

• Unlimited Turndown - The unit can operate at turndown approaching 100%.

• Unrestrained Tube Expansion/Contraction - The tubes are fixed at one end only, thus free of thermal stress.

• Superheat - When specified at the design stage integral superheat capability can be provided.

• Small Foot Print – Vertical equipment occupies significantly less plot space than horizontal options.

• Removable Bundle – The bundle is removable and can be replaced easily in the field.

• Armstrong Experience - Armstrong Chemtec Group is the worldwide leading supplier of this equipment, based on a wealth of experience gained over 70 years of designing and fabricating vaporizers from plants in the USA, Scotland and Singapore.

Armstrong Chemtec Group also designs and manufactures horizontal direct electric and horizontal indirect electric vaporizers for various applications.