Watson-Marlow SPS - Manual (Page 28)

MasoSine SPS sinusoidal pumps User Manual 28
16 Flushing the seal system
Flushing fluid at atmospheric pressure—usually water—flushes the area behind the
seal system and prevents the product from hardening and damaging the seal sys-
tem. If a static flushing device is fitted, the flushing fluid fills the area behind the
seal.
l Cast iron power frame: If no static flushing device is fitted, adapt a fitting and
a tube to the threads of the intake and outlet in the power frame (see diagram
below; models differ) and circulate flushing fluid through the system.
l Stainless steel power frame: Make sure that the correct flush ring is installed
with tube connections and circulate flushing fluid through the system.
l The flushing medium must be at least suitable to the product being pumped. It
should not contain abrasive particles, which would damage the seals. We
recommend that transparent plastic tubes are used as flushing tubes.
l The pump should be flushed without pressure: the flushing fluid should be
allowed to drain from the system without pressure.
l Fill the pump with liquid to prevent it from running dry, possibly via a separate
intake valve connected to the suction or pressure pipe.
l If your pump is set up for permanent flushing, always check the intake and
outlet (see diagram below).
16.1 Static flushing
device
Before commissioning, fill the
flushing device (if supplied) with a suit-
able flushing fluid, depending on the
product being pumped. Fill the sight glass
with flushing fluid until the fluid level is
just below the bend in the outlet pipe.
Note: The diagram shows a flushing
device fitted to a pump with a cast iron frame. Pumps with stainless steel frames
are similar.
Intake
Make sure before start-up that all valves on the
pressure and suction sides are open. The pump must
not pump against a closed valve without an over-
pressure valve.
If the pump leaks, stop pumping as quickly as possible
and replace the damaged sealing elements. See 22
Dismantling and assembly and 25.2 Seals.
The operator must ensure that the pump can work free
of cavitation. Cavitation can destroy the pump. See
12.1 Cavitation.
Outlet