Maag S Series, Инструкция по установке, эксплуатации и обслуживанию, Страница: 3 / 16

MAAG-14000-E-02EMEA
1
S SERIES TWIN SCREW PUMPS
S E C T I O N 1
I N T R O D U C T I O N
FOREWORD
This manual is intended to assist those who are involved with
the installation, operation and maintenance of a Maag S Series
Pump . These instructions must be thoroughly reviewed in their
entirety and fully understood prior to pump installation, operation
or maintenance . Special attention should be given to pump
lubrication, heating, cooling and sealing during pump installation,
operation and maintenance .
Maag S Series Pumps include 2H, 2HE, 2HM, 2HR, 2HC, 2HH, 2MPS,
2VE and 2VM models .
PUMP FUNCTIONALITY
Maag S Series Pumps are rotary, positive displacement pumps
capable of handing various clean liquids containing no solids . The
pump is composed of two opposing sets of screws . During pump
operation, the screws located on the two shafts are engaged and
therein form a sealed cavity with the surrounding pump casing .
The pumped liquid is displaced axially as the screw shaft turns
steadily and constantly, allowing liquid to flow to the center of the
pump where the discharge port is located . Hydraulic force on the
two screws is both opposite and equal, allowing for hydraulic axial
stress on the screw shafts to be automatically balanced .
The pump’s suction opening for liquid is designed to ensure the
flow velocity changes constantly, resulting in reduced entrance
friction . The smaller the pump’s NPSH, the higher the pump’s
suction-lift capability . The unique construction (side-inlet and
side-outlet; side-inlet and up-outlet; shaft inlet and up-outlet)
allows the storage of liquid while the pump is not operating and
allows the pump to be in a self-priming state .
The pressure-limited valve protects the pump from excessive
pressure increases . The valve is actuated at a pressure of
approximately 1 .5 bar (21 .8 psi) above the maximum differential
pressure and allows the medium to flow back to the intake
chamber . The pressure-limited valve cannot be used for capacity
or pressure control . This valve is suitable for single-direction
rotation pumps; otherwise, special valves should be used for
double-operation pumps .
Separate screw-shaft construction is adaptable according to
pump application intentions . The shafts are made of high-strength
alloy steel for greater strength while subject to higher power and
torque requirements . Various screw-material options are available
in order to meet any special application requirements .
Separately lubricated timing gears are used to transmit power
from the driving shaft to the idler shaft and to prevent metal
contact between the meshed, rotating screws, thereby increasing
the life expectancy of both the screws and shafts .
SAFETY PRECAUTIONS
This manual contains basic references that are to be observed
during pump transportation, installation, operation and
maintenance, and, therefore, should be kept as part of the
permanent pump records and readily accessible as a reference to
any person working or maintaining the pumping unit .
The instructions within this manual must be thoroughly reviewed
in their entirety and fully understood prior to pump installation,
operation or maintenance care .
These pumps have been designed for safe and reliable operation
when properly used and maintained in accordance with the
instructions contained within this manual . A pump is a pressure-
containing device with rotating parts that can be hazardous . Failure
to read and comply with installation, operation and maintenance
instructions will void the responsibility of the manufacturer and
may result in bodily injury or equipment damage .
NOTE: In addition to the Safety Precautions identified in this
section, special safety information is included within later chapters
where appropriate .
Markings and Instructions on Pump Unit
Direct instructional references regarding direction of rotation,
fluid-flow orientation, safety warning, etc ., are clearly marked on
the pump . Please observe and follow all indicated safety markings
and instructions .
NOTE: Failure to observe safety references can result in the
following dangers:
• Equipment failure
• Maintenance and service policies voided
• Environmental pollution due to hazardous substance leakage
• Personal endangerment as a result of electrical, mechanical
and chemical influences
Qualified Personnel & Training
All persons installing, operating, maintaining and inspecting the
pumping unit must have the required qualifications for work to be
performed . All instructions and safety markings must be observed,
understood and adhered to by all personnel working on or around
the pumping unit . If installation or operational knowledge is
inadequate, training must be provided . The scope of the personal
responsibilities, competency and supervisory duties must be
closely controlled by the purchaser of the pumping unit .
Safety References for Customers
All work performed on or around the pumping unit must be
completed by qualified personnel .
• Machine components that are either hot or cold must be
protected on-site to prevent personal endangerment .
• Safety markings on the pumping unit must not be removed
from the machine while the pump is running .
• Leakage of hazardous media (i .e ., toxic, flammable, explosive,
etc .) must be collected in a way that no damage to personnel