4.A.2.Pumps capable of circulating solutions of concentrated or dilute potassium amide catalyst in liquid ammonia (KNH₂/NH₃), having all of the following characteristics:

a. Airtight (i.e., hermetically sealed);
b. A capacity greater than 8.5 m³/h; and
c. Either of the following characteristics:
1. For concentrated potassium amide solutions (1% or greater), an operating pressure of
1.5 to 60 MPa; or
2. For dilute potassium amide solutions (less than 1%), an operating pressure of 20 to 60 MPa.