The chemical cantilever pump type X is designed for pumping chemically active and neutral liquids at temperatures ranging from 233 to 393 K (from -40 to +120°C).

The type X pump is a centrifugal, horizontal, single-stage pump with a casing-mounted bearing. The shaft seal of the pump is either a double mechanical seal or a gland packing.

In our case, the X100-80-160 pump is used for pumping ammonia, and a gland packing was used as the sealing method.

It is well known that a double mechanical seal offers several advantages over gland packing (reduced leakage of the pumped liquid, preservation of pump performance, and reduced maintenance costs).

The double mechanical seal was installed as follows, using two mechanical seals R-MG1:

Technical specifications

• Allowable radial runout – no more than 100 µm.
• Misalignment between chamber and shaft – no more than 0.2 mm.
• Coolant pressure in the chamber Pk = Pw (working pressure in the tank) + 10%.

To lubricate and cool the sealing surfaces, a barrier liquid (technical water, antifreeze) is used under a pressure that exceeds the working medium pressure by 0.1 to 0.2 MPa. In case of leakage, the barrier fluid enters the product.