Page 8
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Chapter 1 - Guidance documents
Translation of original instructions -
S
CUBIC-
S
BOXER
rev.
2021
Title
CHAPTER
Sequences
Operative
Contents
Graphs
Numbers
PAGE
CAUTIONS
WARNINGS
and NOTES
Personal
Authorised
Title
SECTION
CONTENTS OF THE ORIGINAL INSTRUCTIONS
The topics are covered in order to allow a classification of the information and the
professional address to which
they are addressed, so that the contained information can be immediately and directly consulted.
The manual is divided into chapters and related sections that deal with the operational topics for correct installation,
use and maintenance of the pump, with exposure divided into numbered sequences.
The pages are characterised by the following structure and contents:
•
A bar has been created at the beginning of each section which, through symbols, indicates the personnel
authorised to perform the operation, the prohibitions to be observed, the obligations and the Personal Protective
Equipment (PPE) that must be used;
•
The residual risk that may occur during the operations is highlighted by appropriate symbols, integrated with the
text.
Special symbols are used within the manual to highlight and differentiate particular information or suggestions
important for the safety and/or correct installation, maintenance or replacement of the pump.
With these precautions, the Manufacturer intends to draw the attention of qualified Technicians to the CAUTIONS, WARN
-
INGS or NOTES concerning them.
For any doubts or clarifications regarding the contents of this manual, do not hesitate to contact the Man
-
ufacturer’s Technical Service.
Tel.
+39 / 0331 074034
Fax
+39 / 0331 074036
e-mail:
website:
www.debem.com
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Translation of original instructions -SCUBIC - SBOXER rev. 01-20
Chapter / 2 - Introductory Information
2.5 PUMP DESCRIPTION
2.5.1
FUNCTIONING PRINCIPLES
Thepneumatic pumps of the SCUBIC and SBOXER series consist of an internal insert that directs air to the
diaphragms of the two pumping bodies by moving them via a central pin. The diaphragms integral with
the central driving pin are operated with alternating motion in two stages (suction-delivery) and constitute
the pumping elements.
The respective fluid retaining ball valves are housed between the two pumping chambers and the pump
delivery and suction ducts.
The two-stage operating principle operates simultaneously (while one chamber is in the suction phase, the
second chamber is in the discharge phase), guaranteeing negative suction, high head and the pumping of
fluids with high viscosity and solid parts in suspension
(see 2.6 CHARACTERISTICS TECHNICAL DATA)
.
2.5.2
INSTALLATION REQUIREMENTS AND FEATURES
SCUBIC and SBOXER air pumps are self-priming and can run dry and allow varying the operating speed
even during service.
They can be used for the recirculation and pumping of liquids with high viscosity and solid parts in
suspension
(see 2.6 TECHNICAL FEATURES)
. Their operation is envisioned for horizontal installations,
above and below head, with precautions compliant with the features of each model
(see 2.6 TECHNICAL
FEATURES)
.
The suction and delivery pipes can be suitably sized
(never smaller than the pump) to ensure minimum flow
rates and optimal performance.
2.6 INTENDED USE AND IMPROPER USES
2.6.1
INTENDED USE
The air-driven SCUBIC and SBOXER pumps have been designed and constructed to pump liquids and
aggressive liquids (acid or alkaline) with chemical composition and temperatures compatible with the
pump materials and apparent viscosity of between 1 and 20,000 Cps at 20°C (see the Technical Data
Sheet of the Pump model);
viscosities higher than 20,000 Cps at 20°C result in physical factors that
require correct evaluation, therefore, it is always necessary to contact the Manufacturer’s Techni-
cal Department in advance.
The maximum temperature allowed for process fluid depends on and/or is downgraded by the construction
material of the pump and system.
CAUTION
The maximum temperature limits are based on two factors, mechanical and corrosive. Some of the flu
-
ids used may significantly reduce the maximum safety temperatures due to the high corrosive content.
Conformity
with the ATEX marking affixed on the pump is no longer ensured when the maximum
temperature is exceeded.
2.6.2
CALCULATION OF MAXIMUM FLUID TEMPERATURE (for Zone 1 - Zone 21)
Below is
the formula for determining the maximum permissible fluid process temperature for
SCUBIC e
SBOXER pumps in CONDUCT version: II 2G Ex h IIB T4 Gb and
II 2D Ex h IIIB T135°C Db) for installation in Zone 1 - Zone 21.
Temperature Class
ATEX
IECEx
Calculation Factor
(only for Zone 1- Zone 21)
Maximum temperature of
Fluid process
ATEX
T4
-
Tx 55°C
=
Tf 80°C
IECEX
135°C
-
55°C
=
80°C
4.3.4a
4.3.4b
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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
SCUBIC and SBOXER 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.