For the purpose of injecting ammonia the cargo may be circulated by means of the cargo pump. Gaseous ammonia may be injected into the circulating cargo.
The seal for the centrifugal pump should be a stuffing box provided with a lantern ring. Fresh water under pressure should be injected into the stuffing box at the location of the lantern ring (see figure 5).
Figure 5 Water flushed seal in chemical pump