Flowserve MSS User Manual
User Instructions
- Original Instructions-
Split Mechanical Seal MSS
For Piloted and Non-Piloted Models
Installation and Maintenance Instructions for Machinery Parts
Experience in Motion
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1. Drawing, Brief Description, Function
See the annex for the installation drawing.
1.1 Specifications
for the operations described herein:
Application limits:
Product pressure (bar) Vacuum / 5 1)
Va
cuum / 7
2)
Test pressure product chamber (bar) 8 3)
Speed (rpm) 350
1)
1750
2)
Product temperature (°C) up to 121
1)
dry
2)
wet
3)
statically, v = 0 m/s
The application limits specified are maximum load values and assist in
preselection. The application limits must be checked for every application.
A warranty in an individual case is possible only when FLOWSERVE
knows the exact application conditions and these have been confirmed in
a seperate agreement.
1.2 Brief description
The split mechanical seal MSS is delivered as a bidirectional, partially assembled
mechanical seal. While it has been designed for rugged industrial applications and
ease of installation, it does require careful assembly in a clean environment according to the following installation steps.
The MSS seal is primarily designed to seal agitator shafts and can be run dry up
to 350 rpm or wet up to 1750 rpm. Consult your local nearest Flowserve Sales and
Service Representative, regarding other applications.
1.3 The spring force and the product pressure push the seal ring against the mating ring.
The seal faces are sealed from the shaft sleeve, respectively from the housing, by
sealing elements (e. g. O-rings). The faces of the seal ring and the mating ring are
designed as sealing faces.
!
The installation chamber for the mechanical seal type MSS must be checked
against the corresponding drawing and table of dimensions. It must be ensured
that all dimensions, surface qualities and tolerances (e. g. concentricity, runout,
fits) are observed.
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Split Mechanical Seal MSS - Installation and maintenance instructions for machinery parts
1.4 Function
The faces of the seal ring and the mating ring are designed as sealing faces. The seal
faces of the seal rings are contacting and wearing slightly, when the machine shaft
rotates. The consumed quantity of product leakage is low and depends on the operating conditions, it enters the atmosphere through the seal gap.
!
The product pressure may not exceed the values given under item 1.1.
1.5 Function conditions
The MIXERPAC’s function is obtained only when the following conditions are fulfilled:
•
Plane-lapped seal faces.
•
Perpendicularity between the seal faces and the shaft centerline.
•
Unforced clearance of the rotating parts within the specified tolerances.
•
Prevention of sedimentation on the surfaces of the shaft or shaft sleeve by e. g.
crystalliation or polymerisation.
•
Prevention of the product from adhering in the area at the seal gaps.
•
Permanent fluid film in the seal gaps.
•
Adherence to the specified operating data as per item 1.1 respectively the data
sheet.
If these function conditions are not fulfilled, the leakage rate increases and parts
of the product can escape into the atmosphere. Additionally, disregarding of these
issues can result in high component temperatures.
!
See the Directive 94/9/EC. EN 13463, Part 1 - 8.
2.0 Information on Safety
2.1
DANGER:
This symbol means, that failing to observe this information involves
the risk of personal injury and / or considerable damage to property.
!
IMPORTANT: This symbol draws your particular attention to important informa-
tion that is possibly not clear even to qualified personnel. This information, however, must be observed to prevent malfunctions that in
turn could directly or indirectly give rise to serious injury and / or
property damage.
2.2 The customer and / or the operator must ensure that all persons assigned to handle,
assemble or run the machine have carefully read these installation and maintenance
instructions, before they commence any installation and maintenance work at the
MSS or before operate the machine. These personnel must be fully acquainted with
the layout and function of the MSS and the respective support system.
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2.3 Damage may cause leakage in gaseous form. The hazardous effects correspond
to those of the product, and there may be hazard to persons or the environment.
The operator’s regulations concerning work safety, accident prevention, and pollution for this plant section must be adhered to without exception.
2.4
!
Components coming into contact with the leakage must be corrosion-resistant or
corrosion-proof.
2.5
!
Mechanical seals must be decontaminated before they are sent to FLOWSERVE
for maintenance or repair.
2.6
!
When employing elastomers of EP (ethylene-propylene) or butyl rubber, do not
use any grease or oil on a mineral basis as a lubricant.
2.7
A loss, a re-establishment or a change of the power supply for the machine and /
or the barrier system may not impair the properties of the mechanical seal and /
or involves a risk of personal injury and / or considerable damage to property.
2.8
Assigned protection devices from the machine manufacturer must be accordingly
arranged and may no cause additional endangerments. They must ensure the
necessary range for the accessibility to maintenance work to the mechanical seal.
2.9
The electrical supply of the machine must correspond to the protection targets of
the Directive 2006/95/EC.
No endangerments for persons and environment may proceed from a non electric
power supply.
3.0 General
3.1 All illustrations and details in these instructions are subject to technical alterations
that are necessary in improving the mechanical seal.
3.2 The copyright on these installation and maintenance instructions is the property of
FLOWSERVE. These installation and maintenance instructions are intended for the
assembly, operating, and supervisory personnel and contain regulations and drawings of a technical character that may not, in full or in part, be copied, distributed,
used without authorization for competitive purposes, or given to others.
3.3 We point out that we accept no liability for any instances of damage or malfunctions
of the machine incurred through nonadherence to these installation and maintenance
instructions.
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Split Mechanical Seal MSS - Installation and maintenance instructions for machinery parts
4.0 Transport, Storage
4.1 The mechanical seal must be transported and stored in the unopened original packaging. The storage site must be dry and free of dust. Influences through temperature
or irradiation must be avoided.
4.2 Parts or complete mechanical seals that have been dropped or otherwise subjected to
heavy impacts during transport must not be installed. An inspection by FLOWSERVE
becomes necessary.
4.3 After a storage period of three years the mechanical seal must be inspected for prop
erties as new. This applies in particular to the secondary seals and seal faces. We
recommend an inspection by FLOWSERVE.
4.4
!
If the machine is to be preserved with integrated mechanical seal the preserving
medium must not impair the function of the mechanical seal by e. g. fouling or
hardening or swelling the secondary seals.
4.5 The mechanical seal must be transported with adequate tools, e. g. by using
industrial trucks or lifting devices.
5.0 Preparing for Installation
5.1
!
The mechanical seal may be installed when there are no visible signs of damage
to the mechanical seal. This applies in particular to the static faces of the flange,
centrings and the static sealing elements.
!
Before installing, consult the specifications on the accompanying documents to
verify that the correct mechanical seal has been installed correctly and is suitable
for the specified application. Do not exceed the design data.
!
Requisite for all assembly work are the installation drawing and parts list and the
tools and aids required for the assembly.
!
Vibrations must not be allowed to reach the installed mechanical seal when the
machine is operating or in particular when it is shut down. Vibrations can be
stopped e.g. by structural measures on the machine.
!
Installation of this seal requires the use of an adhesive to bond the O-ring secondary seals together. Do not allow the adhesive to come in contact with the skin.
!
The installation chamber for the mechanical seal must be checked against the
corresponding drawing and table of dimensions. It must be ensured that all
dimensions, surface qualities and tolerances (e. g. concentricity, runout, fits) are
observed.
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!
Ensure the highest degree of cleanness. Force must not be used to install the
seal. Use only suitable tools and devices.
!
The seal faces of the mechanical seal are important functional sections and may
not be damaged.
!
All functional and assembly areas for the secondary seals (e.g. O-rings) must be
dimensionally accurate, free of scratches and burrs, flash-free and rounded.
!
The fitting surfaces of the mechanical seal and the installation chamber must be
undamaged and dry. Ensure the highest degree of cleanness.
!
A thin coat of product-compatible grease (e. g. Molykote M55) is to be applied to
the sealing elements. Excess grease is to be avoided.
!
Depending on the installation direction, a lubricant, (e. g. Molykote D321R) or
PTFE spray without solvent, must be applied to the shaft or shaft sleeve.
!
The areas for the clamp-connections must remain free of grease, otherwise the
adhesive force will become inadequate for correct functioning
5.2
Equipment Check
5.2.1 Follow plant safety regulations prior to equipment disassembly:
• lock out motor and valves.
• wear designated personal safety equipment.
• relieve any pressure in the system.
• consult plant MSDS files for hazardous material regulations.
5.2.2 Dismantle the machine in accordance with the instructions from the machine manu
-
facturer to reach the installation chamber for the mechanical seal.
5.2.3 Remove existing mechanical seal and gland or packing gland (follower flange) and
the first few rings of compression packing down to the lantern ring.
5.2.4 Make sure the shaft or sleeve in the seal shaft packing (P) area and the seal hous
ing bore (B) and face are clean and free of burrs, cuts, dents or corrosion that might
cause leakage past the rotating face gasket or stationary face mounting O-rings.
5.2.5 Check equipment dimensions to ensure that they are within the dimensions shown
in Figures 1 and 2 or 3. Critical dimensions include shaft or sleeve OD (A), seal
housing bore (B), and the distance to the first obstruction (J).
5.2.6 Check gland bolting to ensure that bolt size (D) and bolt circle (F) conform to the
dimensions shown in Figures 2 or 3.
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