Manufacturas Petroleras, S.A. de C.V.
Mapesa designs and provides a variety of bubble cap trays nwhich are the most leakfree trays available. Our most common bubble cap designs include conventional slotted caps (some have slots for vapor passage and others do not). Standard cap sizes are 3", 4" and 6". Of course, custom designs are available as well. The potential mechanical configurations for the various riser and cap assemblies are numerous. Typical manufacturing methods to secure the riser and cap assembly to the tray floor include seal welding, press fitting, through bolting and swaging riser into extruded opening as depicted at right.
Bubble cap trays usually have a lower capacity (10-20 percent) than properly designed valve or sieve trays; however, they are capable of efficient performance over a wider operating range due to their superior leak proof characteristics.
Our MP-A1 three piece valve has been successfully used in many cases to replace the bubble cap tray in services where low liquid rates are common. The bottom piece of the unit is a lightweight orifice cover which seals off under low vapor rate conditions thereby minimizing leakage.