4.3.4a
4.3.4b
Page 32
of
68
INDUSTRIAL PUMPS
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Chapter 4 - Transport and Positioning
Translation of original instructions -
S
CUBIC -
S
BOXER
rev
. 2021
2.5 m
MAX 5 m
Pump
PP
Valve
INOX
OK
Valve
PP
Pump
PP
Conical gas
Cylindrical gas
OK
4.3.4
PRODUCT CIRCUIT CONNECTION
After positioning, it is possible to connect the pump to the product circuit as follows:
CAUTION
:
risk of chemical reactions to water
Before installing the pump for use with liquids that react with tap water, it is necessary to open the product
circuit and dry all internal surfaces.
Product system piping requirements
• The connection fittings must be made of the same material as the pump with cylindrical threads (do
not use conical threads);
• The connection to the pump must be made with a piece of flexible hose with a metal core (direct con
-
nection to the pump with a rigid hose is prohibited);
•
All existing hoses must be reinforced with a metal core;
•
Piping must be self-supported and must not burden on the pump;
•
Correct sizing of the (suction and discharge) ducts for the correct suction speed;
•
Product on/off valves (suction and delivery, that do not cause pressure drops);
•
With particulate matter in suspension, install a properly sized suction strainer on the suction side (surface
area 2.5 / 3 times the suction section of the pump with maximum permitted slot);
•
With products that crystallise, provide a washing or stripping circuit (with compatible products);
•
Product ducts clean inside and without solid processing residues (shavings, particulates, etc.).
4.3.4a
Diaphragm pumps with negative suction are affected by the following factors:
- Fluid viscosity - specific fluid weight - diameter - length and/or bends on the suction.
Position the pump as close as possible to the sampling point (within 2.5 m) and in all cases never more
than 5 m. The diameter of the suction pipe should never be smaller than that of the pump connection; it
should be increased as the distance or viscosity of the fluid increases.
CAUTION
:
risk of premature wear and/or diaphragm breakage.
The fluid to be pumped with negative suction must never exceed a viscosity of 5,000 Cps at 20°C and a
specific weight of 1.4 Kg/l.
Higher viscosities result in physical factors that require correct evaluation, therefore, it is always neces-
sary to contact the Manufacturer’s Technical Department in advance.
4.3.4b
S
CUBIC and
S
BOXER
series pumps are supplied with product connection seats with cylindrical Gas
threads. For
connections to the pump manifolds, use only fittings with cylindrical gas threads (not conical)
of the same material as the pump.
Example:
(
PP
pump =
PP
fittings) or (
INOX
pump =
INOX fittings).
On the delivery and discharge manifold install a manual valve of the same diameter as the pump inlet
(never smaller) or larger for negative suctions or for fluids with high viscosity.
If necessary, load two turns of PTFE tape on the thread and tighten the valves onto the
pump manifolds (with moderate clamping pressure) until the seal is ensured.