For 100 years the liquid ring vacuum pump is the “workhorse” among the vacuum pumps. Often scolded because of operating fluid consumption, but impossible to imagine modern life of process technology without them.
For decades HERMETIC is developing the use of these pumps in process technology, where always poisonous and sometimes corrosive fluids are to be handled. Many years usual liquid ring pump hydraulics have been equipped with canned motor or magnetic coupling in order to meet the special requirements of process technology.
Here it became more and more apparent that these hydraulics first of all have been designed for the handling of water. Sealing of liquid towards the atmosphere mostly is effected by liquid seals, and the casing strength is not constructed for special requirements of process engineering. Extensive re-fitting always was necessary.
Due to these circumstances, HERMETIC has decided to develop a new liquid ring vacuum pump series, which is optimised from the beginning for the special demands of chemistry and petrochemistry.
The construction is based on single-stage liquid ring vacuum pumps with port plates and valve control on discharge port. Sizes as well as outer dimensions are adapted to current executions on the market in order to facilitate an exchange against other pump makes.
Nevertheless, the pumps considerably distinguish from other similar looking liquid ring pumps to meet the requirements of chemistry and petrochemistry according to API 681:
- Pressure resistance minimum PN 10
- Flanges with seal face according to chemistry standards
- Casing sealing with chambered elastomer gasket
- Ductile materials
- Flexible selection of corrosion-resistant materials
- API mechanical shaft seals
- Shaft bearing designed according to API 681
The pumps of course are also available in seal-less execution, the design with magnetic coupling or canned motor, however, is not described in API 681. The bearing of the magnetic-coupled executions has been developed from our proven designs.
Although the new series offers much more advantages, the prices could be created more attractive compared to the previous vacuum pump series LVS. HERMETIC can offer 10 different sizes with a suction capacity from 50 m³/h to 1800 m³/h.
Standard material is austenitic CrNi cast steel, but duplex qualities or nickel-base alloys are also available. Some models also can be supplied in titanium.
The pumps are sold world-wide directly by HERMETIC and assembled in package units according to customer’s specific requirement.
