Mechanical seals are used to control leakage of liquids in centrifugal pumps. They work through basic physical principles to seal the pump shaft where it enters the pump housing. While all mechanical seals leak slightly to lubricate the seal faces, modern seals control leakage much better than older packing methods. There are several types of mechanical seals that differ in their configuration and installation, such as shaft mounted vs cartridge seals, and single vs dual (or multiple) seals. Proper selection of seal type depends on factors like the process liquid, pressure, and ease of maintenance required.
Bearing failure and its Causes and Countermeasuresdutt4190
A brief review about bearing and failure of its various parts due to other possibilities than design such as manufacturing, improper service and handling and other similar aspects.
Following presentation consist of a fundamental steps that took place during a pump overhaul.
this presentation will give you the basic idea about maintenance .
Bearing failure and its Causes and Countermeasuresdutt4190
A brief review about bearing and failure of its various parts due to other possibilities than design such as manufacturing, improper service and handling and other similar aspects.
Following presentation consist of a fundamental steps that took place during a pump overhaul.
this presentation will give you the basic idea about maintenance .
Definition, Use, Types of beariings, Types of Journal bearing, Materials for journal bearing, Failures of journal bearing, Design terms for journal bearing, Types of roller contact bearing, applications of roller contact bearing, Designation of roller contact bearing, Design terms for roller contact bearing, comparison between journal and roller bearings, characteristics of bearings, selection procedure of bearings
Hydraulic accumulator is an accessory of a hydraulic system.
A hydraulic accumulator is a pressure storage reservoir in which a non-compressible hydraulic fluid is held under pressure by an external source.
The external source can be a spring, a raised weight, or a compressed gas. An accumulator enables a hydraulic system to cope with extremes of demand using a less powerful pump, to respond more quickly to a temporary demand, and to smooth out pulsations. It is a type of energy storage device.
All valves require proper care and maintenance,as does other more complex equipment, to ensure theyare kept in optimum working order. The principledifficulties encountered with valves are leakage pastthe seat and disk, leakage at the stuffing box, stickingvalve stems, and loose valve disks.
One of the most frequently used types of seal is the rotary lip seal, generally used for sealing lubricating oil or grease in rotary shaft applications. Lip seals appeared at beginning of the 1900s and they are still unbeaten in many rotary and reciprocating applications.
Definition, Use, Types of beariings, Types of Journal bearing, Materials for journal bearing, Failures of journal bearing, Design terms for journal bearing, Types of roller contact bearing, applications of roller contact bearing, Designation of roller contact bearing, Design terms for roller contact bearing, comparison between journal and roller bearings, characteristics of bearings, selection procedure of bearings
Hydraulic accumulator is an accessory of a hydraulic system.
A hydraulic accumulator is a pressure storage reservoir in which a non-compressible hydraulic fluid is held under pressure by an external source.
The external source can be a spring, a raised weight, or a compressed gas. An accumulator enables a hydraulic system to cope with extremes of demand using a less powerful pump, to respond more quickly to a temporary demand, and to smooth out pulsations. It is a type of energy storage device.
All valves require proper care and maintenance,as does other more complex equipment, to ensure theyare kept in optimum working order. The principledifficulties encountered with valves are leakage pastthe seat and disk, leakage at the stuffing box, stickingvalve stems, and loose valve disks.
One of the most frequently used types of seal is the rotary lip seal, generally used for sealing lubricating oil or grease in rotary shaft applications. Lip seals appeared at beginning of the 1900s and they are still unbeaten in many rotary and reciprocating applications.
CHALLENGES AND CORRECTION OF MECHANICAL SEAL LEAK FULL CONTACT RING.pptxLEAK-PACK
Use of Mechanical Seals, which confines product leakage across the pump shaft with two extremely flat surfaces. visit: https://leakpack.com/challenges-correction-mechanical-seal-leak-full-contact-ring/
What is and what is the function of a rubber seal
The Increasing of the speed of mechanical systems, driven by the desire for greater productivity, leads to higher operating temperatures and reduced fluid viscosities. This, coupled with higher pressures, causes an increasing tendency for fluid to leak. This leak in fuel systems that handle highly flammable solvents cannot be overlooked as there is a high probability of a fire hazard.
For this reason it has become common practice to include a safe leak path in the system design, to an escape or collection point, in order to minimize risk.
Seals prevent fluid from escaping from a hollow cylinder when a shaft penetrates the cylinder wall. Most commonly, the axis will have a rotary or linear motion. If a seal is not made for functional requirements, or installed and maintained properly, it can fail, causing fluid loss. The two main functions of a seal are to keep the fluid in while keeping dirt and debris out.
A mechanical seal is a sealing device which forms a running seal between rotating and stationary parts. They were developed to overcome the disadvantages of compression packing. Leakage can be reduced to a level meeting environmental standards of government regulating agencies and maintenance costs can be lower.
We are one of the best rubber bellow mechanical seal manufacturers and suppliers and also We provide the rubber bellows seal with very high mechanical strength.The rubber bellow type mechanical seal are trouble-free to install and very easy to remove.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
2. INTRODUCTION
• Since their inception, mechanical seals have carried with them a
mystique of “Gee Whiz”, bizarre, physics defying properties that
have baffled the untrained observer. But that impression is really
misplaced. Mechanical seals are not magic by any means and
actually perform well within the realm of easy to understand
principles of physics and hydraulics.
• Mechanical seals are simply another means of controlling leakage of
a process where other means are deemed to be less capable of
performing the task adequately. For the purposes of this discussion,
consider that a mechanical seal will out-perform common types of
packing.
• As mechanical seals can be used to seal a myriad of different
products on an equally vast array of equipment, we will be primarily
focusing on the use of mechanical seals on rotating shaft pumps.
Since our subject is dealing with pumps, let’s first explore a basic
understanding of the need to seal a process liquid in a centrifugal
pump.
3. CENTRIFUGAL PUMPS
• A centrifugal pump is simply a shaft, suspended on
bearings with an impeller attached to one end. The
impeller is encased in a housing that is filled with a liquid.
As the shaft is rotated, centrifugal force expels the liquid
out through an orifice, where it is typically piped into a
process or another collection point. As the expelled liquid
exits the case, additional liquid is added to the case so
that a flow develops. That is basically how a centrifugal
pump works.
• The next slide shows a photograph of a typical “End
Suction Centrifugal Pump”.
5. AS THE PUMP SHAFT ROTATES
A LIQUID IS SUPPLIED TO THE
PUMP “SUCTION”
CENTRIFUGAL FORCE EXPELS THE
LIQUID OUT FROM THE IMPELLER
6. CENTRIFUGAL PUMPS
• The force of the expelled liquid creates pressure. This
liquid under pressure will seek areas of lower pressure.
This is a known physical principle of hydraulics. Some
form of seal must be applied to keep liquid from leaking
around the shaft at the point where it enters the case to
drive the impeller. This is where our mechanical seal
comes into play.
• Take a look at the same pump again. Can you see the
mechanical seal behind the impeller?
7.
8. SEAL TYPE
• The mechanical seal shown in
the pump photograph is a Type
“1” mechanical seal. Probably
the most widely recognized and
also most common mechanical
seal used in general service,
low pressure applications.
• At Utex, we refer to this type as
RS-1
• The assembly shown in the
pump is configured with a
ceramic “O-ring” type stationary
seat and is also equipped with a
“set screw collar”.
9. SEALING THE LIQUID
• Mechanical seals were originally designed to lend a
greater sealing capability than could be achieved using
common packing.
• Before the advent of mechanical seals, pump users relied
primarily on “rope” or braided style packing to achieve a
“seal” around the shaft. A series of pieces or “rings” were
installed into the pump “stuffing box” and they were
compressed tightly so that they created a difficult leak
path for the liquid to negotiate in order to leak to
atmosphere.
10.
11. SEALING THE LIQUID
• Early packing styles did not seal very well. In fact, until
recently, braided packing styles required varying amounts
of leakage for lubrication. If leakage was not permitted to
occur, the packing would literally “burn up” and often
cause severe damage to the pump shaft. Even with
adequate leakage for lubrication, pump shaft wear was a
commonly expected occurrence and as the shaft wore it
would in turn, cause poor shaft packing life.
• As leakage becomes more excessive, the gland is
tightened to reduce leakage.
12.
13.
14.
15.
16.
17. SEALING THE LIQUID
• With the introduction of mechanical seals, this leakage
could be controlled to a much greater degree.
• Let’s look at the same pump with a mechanical seal
installed. Note that the seal shown is an RS-1 with O-
Ring type stationary and a set screw collar.
18.
19.
20. SEALING THE LIQUID
• You have probably taken notice of the illustration showing
minor leakage to atmosphere. It is appropriate to point
out at this time…
22. SEALING THE LIQUID
• It is a fact, all mechanical seals leak. Like packing, the
mechanical seal “faces” must also be lubricated. With
proper application and design however, the leakage is so
minute that actual droplets of liquid are not detected.
Instead, the lubricating liquid will vaporize as it crosses
the seal faces and the leakage is a gas or vapor.
• Since we are discussing the sealing of the liquid at the
faces, let’s take a look at the sealing points of a typical
mechanical seal. Again, viewing the same pump and
seal, note that there are four sealing points to consider.
23. Sealing on the shaft
O.D. of the stationary
The seal gland to the
stuffing box
And finally, the seal faces
25. FACE FLATNESS
• The mechanical seal faces are obviously the most critical
sealing point of a mechanical seal assembly.
• Although the faces can be manufactured from a myriad of
different materials, one is typically carbon, while the other is
usually a hard material. (i.e. Alox (Aluminum Oxide Ceramic),
Tungsten Carbide, Silicon Carbide, etc.)
• In order for a “seal” to be achieved, the faces must be very flat.
This is achieved by machining the faces, then “lapping” them to
a fine finish.
• Flatness is measured in “Light Bands”. After lapping, the faces
are placed on an “Optical Flat”, a clear glass surface where a
monochromatic light is shined on the face. This single
wavelength light will produce an image of rings or lines on the
face. Each ring/line is “One Light Band”. Each light band is
equivalent to .000011” or eleven millionths of an inch. This refers
to the variations in the surface of the face. On most face
materials, one light band is Utex’s standard.
26. FACE FLATNESS
• This illustration shows a face
being inspected on an Optical
Flat.
• Take notice of the light bands
that are visible on the reflection
of the face.
• Laying a straight edge on a
tangent to the inside
circumference of the face, how
many light bands are crossed?
28. FACE FLATNESS
• As was stated earlier, it is hoped that the application and design
of the mechanical seal is suited for the service. If so, there is
leakage of only vapor through the seal faces.
31. SEAL TYPES
• There are obviously many different types and
configurations of mechanical seals. Shaft mounted and
cartridge, balanced and unbalanced, pusher and non-
pusher, single and multiple, etc., etc.
• Here we will examine the basic differences without going
into a great detail.
32. SEAL TYPES
• First, let us examine shaft mounted vs. cartridge.
• A shaft mounted seal requires the pump user or
assembler to actually install individual seal components
into the equipment.
• Let’s look at the installation of the RS-1 that we were
looking at previously.
34. The seal assembly is slipped onto the pump shaft
and the set screws tightened in the correct position
to insure proper “installed length” of the assembly.
35. The gland is tightened evenly so that the seal
is compressed to it’s recommended length.
36.
37.
38. SEAL TYPES
• A cartridge type mechanical seal is a pre-assembled
package of seal components making installation much
easier with fewer points for potential installation errors to
occur.
• The assembly is “pre-set” so that no installed length
calculations must be performed for determining where to
set the seal. This pre-set is achieved by the use of “set
tabs” that are removed once the seal is installed and the
pump assembled.
39. Although the assembly
may look a little
menacing, it is basically
no different than a shaft
mounted arrangement
as far as sealing
components and
sealing points are
concerned.
The same four sealing
points exist here.
Stationary O-ring
Seal Gland Gasket
Shaft/Sleeve O-ring
Seal Faces
The “set tabs” are
removed after
installation.
One additional sealing
point exists in this
particular cartridge
assembly. Have you
found it?
40. SEAL TYPES
• Remember the number of steps involved in installing the
shaft mounted seal.
• Now let’s look at installing the cartridge seal that we just
examined.
41.
42.
43.
44. PUSHER VS. NON-PUSHER
• Both pusher and non-pusher types can be either shaft
mounted or cartridge assemblies.
• The basic difference between pusher and non-pusher
types have to do with the dynamics of the shaft packing
or O-ring and whether or not it moves as the seal wears.
• As the seal faces wear down over time, they must be
closed to compensate for lost face material. If the shaft
O-ring must move when this compensation takes place, it
is pushed forward by the components of the seal and by
stuffing box pressure. If the seal is configured with a
“dynamic” O-ring of this type the seal is called a pusher
type.
45. Illustrated here is a Type RS-81, a common pusher seal. As the seal
springs and other pressures in the stuffing box are exerted on the seal,
closure of the faces is achieved.
Rotating face and
dynamic O-ring.
Hard Stationary Face
Closing forces exerted
on the seal faces
46. As the softer carbon face wears down, the rotating face must
move to maintain face closure.
47. Minute particles of carbon and solids from the process liquid
that migrate across the seal faces build up on the shaft.
48. This build up will ultimately cause the seal to “hang up” and in most
cases, failure will occur well before the seal is actually “worn out”.
49.
50. PUSHER VS. NON-PUSHER
• There are seal types that have no dynamic O-rings. All O-
rings are “static” and the seal components compensate
for face wear without “pushing” any sealing points.
• One of these types is called a “Bellows Seal”. The
bellows can be constructed of metal, rubber or PTFE.
The RS-1 seen earlier in this presentation is an
“Elastomer (or Rubber) Bellows Seal”.
• Let’s consider the metal variety.
51. METAL BELLOWS
• Metal bellows are constructed
by welding “leaflets” into a
series of “convolutions”. This
series of convolutions is
referred to as the “Bellows
Core”.
• The photo shown here is a
shaft mounted “Utex-MB”.
• Now take a look at how a
bellows seal compensates for
face wear.
56. Debris can build up without causing hang up.
This feature is probably the most notable
selling point when comparing a bellows seal
to a pusher type seal.
57. BALANCED VS. NON-BALANCED
• When speaking of “Balance” in reference to mechanical
seals, we are not talking about Mechanical or Rotational
Balance. Instead, we are referring to Hydraulic Balance.
• Since mechanical seals are subject to stuffing box
pressure, this pressure is utilized to achieve and maintain
seal face closure in a non-balanced seal.
• If stuffing box pressure is very high, typically over 100psi.,
then the closing force may be too great to allow the
“Boundary Layer Liquid” that lubricates the faces to be
sufficient and the faces will wear prematurely.
• A balanced seal compensates for higher pressures by
locating the seal faces such that stuffing box pressure
has less effect on face closure.
58. A non-balanced seal has faces located
outside the “Balance Diameter” of the
seal. Stuffing box pressure is applied
to the faces virtually evenly.
Balance
Line
Face
ID
Line
Face
OD
Line
59. The faces of a balanced seal are located so that
a portion of the face contact occurs inside the
balance diameter resulting in reduced closing
force due to stuffing box pressure. This seal is
a Type RS-8B1. (The “B” = balanced)
Balance
Line
Face
ID
Line
Face
OD
Line
60. Most metal bellows seals are balanced.
Face
OD
Line
Face
ID
Line
Balance
Line
61. SINGLE VS. MULTIPLE
• Most rotating equipment is equipped with a single seal.
This is what we have been examining thus far. Single
shaft mounted seals, cartridges seals, balanced seals
etc.
• Some applications call for a multiple seal configuration.
These are typically dual seal arrangements but can also
be a series of three or more. For our purposes we will
examine dual seal arrangements since that really covers
99% of multiple seal applications.
62. DUAL SEALS
• Dual seals can be either pressurized or non-pressurized. This is in
reference to the artificial environment that is provided to exist
“between” the seals.
• A non-pressurized dual seal, also known as a “Tandem”
arrangement, means that the inner, or primary seal is functioning as
would a single seal. It is subject to stuffing box conditions, i.e. stuffing
box pressure, process liquid to lubricate the faces and usually
immersion of seal components in the process liquid. The secondary,
or outside seal runs in a non-pressurized “Buffer” liquid that is
supplied from an outside source, typically a nearby supply tank.
• In a non-pressurized dual arrangement, the outside seal is primarily
there as a containment device in the event that the inside or primary
seal is lost. A “Back up” or safety mechanism if you will.
• Let’s look at a Dual Cartridge Seal.
63. Inside or Primary seal
Outside or Secondary Seal
Immersed in process liquid
in the stuffing box
Buffer fluid warmed
by seal generated
heat returns to the
buffer supply tank
Cool buffer fluid
from the buffer
supply tank enters
via the inlet port
64. DUAL SEALS
• Since the outside or secondary seal runs in a non-pressurized
clean lubricating liquid, it will generally last for an extended
period of time. When the inside or primary seal fails, the
leakage through the faces will be contained by the secondary
seal until the pump can be shut down for seal replacement.
• Failure indication and shutdown devices can be attached to the
buffer supply so that the pump operators know when the
primary seal has failed.
65. DUAL SEALS
• When pumping volatile liquids, hazardous, corrosive, abrasive, etc. it
is sometimes necessary to insure that the process liquid does not
enter the atmosphere or the artificial environment created for the seal
or even the seal faces.
• Pressurizing the artificial environment, 20 to 30 psi. above the pump
stuffing box pressure will prevent process liquid from crossing the
primary seal faces. Instead, boundary layer film liquid is supplied to
the primary seal by the artificial environment or “Barrier”.
• The arrangement of seals can be the same as a non-pressurized in
most cases. The difference is in how the seals perform.
• In a pressurized dual seal, the outboard or secondary has the
tougher job of the two. It operates sealing high barrier pressure while
the inboard or primary seal has clean lubricating liquid applied at
differential pressure of only 20 to 30 psi.
• Now let’s look at the environmental controls for operating dual seals.
69. DUAL SEALS
• There are many more types of environmental control
arrangements that are discussed in other programs. This
presentation simply covers the basics. For more detailed
information on this topic, contact your supervisor or a Sealing
Technologies Representative.
70. SPLIT SEALS
• Some types of machinery are cumbersome to maintain. Large
shafts, heavy components, and immovable drivers are some of
these concerns.
• Often, a typical mechanical seal is impractical to use by the
nature of it’s installation requirements.
• In these cases it is frequently beneficial to use a Split Seal.
• In a Split Seal, all components are literally cut or split in half
and they are assembled onto the equipment without removal or
disassembly of the major equipment components.
• Obviously, these seals are prone to leak more readily than
non-split seals so they are generally applied to processes
where some leakage is acceptable. Even with some leakage,
they will out perform common packing.
• Split Seals are often used on mixers, agitators and large
volume, large shafted pumps.
71. UTEX EZ-SEAL
• The Utex EZ-Seal is split
radially as shown in this photo.
• All internal components are
also split and they are
assembled onto the equipment
shaft without removing the
equipment from it’s operating
position or tearing down it’s
major components.
73. SPLIT SEALS
• Aside from the fact that the components are split, split seals
operate virtually the same way that most single cartridge or shaft
mounted seals operate.
• By nature of their split design, their application is limited to lower
pressures and non-volatile liquids.
• Now let’s move onto our final discussion topic, Gas Buffer Seals.
74. GAS BUFFER SEALS
• The final seal type that we will look at during this course is the
Gas Buffer Seal.
• Gas Buffer Seals are the latest advancement in sealing
technology. There are as many different types as there are
Sealing Product Manufacturers.
• They were designed to facilitate capabilities similar to a dual
seal without requiring elaborate environmental controls or in
the case of pressurized dual seals, without liquid
contamination of the process liquid.
• We will briefly discuss the features of the Utex DCG Seal.
75. DUAL CO-AXIAL GAS SEAL
• The DCG Seal is a cartridge
arrangement that contains a
“Gas Lift-Off Seal”.
• In a Gas Lift-Off seal, the faces
theoretically never contact.
There is no fluid film between
the faces and since they never
contact, there is no need for it.
• A cut-away drawing of this seal
will follow.
76. DUAL CO-AXIAL GAS SEAL
• This control panel is used to
adjust the gas flow (Nitrogen,
Clean Plant Air, CO2, etc.) that is
inject into the seal gland port at
25 to 30 psi. over stuffing box
pressure. The gas flows through
holes in the carbon stationary,
separating the faces.
• As the seal operates, an
envelope of gas surrounds the
seal faces keeping process liquid
out.
77. UTEX DUAL CO-AXIAL GAS
SEAL
Cut away view of the
DCG shows the Stationary
Carbon Face
Rotating Face Gas inlet
port
Thumb not an integral
part of the seal assembly
78. UTEX DUAL CO-AXIAL GAS
SEAL
The equipment
can then be started
and process suction
opened allowing
liquid into the
stuffing box.
Gas is supplied
to the inlet port.
79. GAS BUFFER SEALS
• More detailed discussion of Gas Seals and their
application is available.
80. PROGRAM SUMMARY
• Through this program we have looked at the basic principles
and designs of mechanical seals.
• It is important to understand that detailed explanation of each
topic discussed here is available.
• Hopefully this presentation has helped to improve your
understanding of mechanical seals.
• Review this program again and as you have questions,
comments or suggestions, ask your supervisor or a Sealing
Technologies Representative. We want this training program to
be as effective as possible and your input is valuable.
• Thanks, and enjoy working with mechanical seals.