Mechanical Seal

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Walrus Booster Pump Mechanical Seal kit for models TQ200 TQ400
Walrus Booster Pump Mechanical Seal kit for models TQ200 TQ400
$9.99
quality
John Crane Mechanical Seal Kit Model M02844 NIB
John Crane Mechanical Seal Kit Model M02844 NIB
$100.00
quality
ROPER PUMP CO GENUINE PARTS MECHANICAL PUMP SEAL G14 226
ROPER PUMP CO GENUINE PARTS MECHANICAL PUMP SEAL G14 226
$20.00
quality
REFURBISHED AESSEAL TYPE CSSN 1875 MECHANICAL SEAL 3AVSS15L01 RG131
REFURBISHED AESSEAL TYPE CSSN 1875 MECHANICAL SEAL 3AVSS15L01 RG131
$199.88
quality
Mechanical Seal 2 478 011 999 00
Mechanical Seal 2 478 011 999 00
$265.00
quality
Mechanical Seal Buna N
Mechanical Seal Buna N
$17.06
quality
ANCHOR ROTA FACE MECHANICAL SEAL 2 1 8 SHAFT TYPE 3A NIB
ANCHOR ROTA FACE MECHANICAL SEAL 2 1 8 SHAFT TYPE 3A NIB
$44.99
quality
LOT OF 2 GORMAN RUPP PUMPS MECHANICAL SHAFT SEAL KITS ID 7 8  5 8
LOT OF 2 GORMAN RUPP PUMPS MECHANICAL SHAFT SEAL KITS ID 7 8 5 8
$30.00
quality
EAGLE BURGMANN CARTEX IKA DN 20 E1 MECHANICAL SEAL ASSEMBLY Q1Q1V16MG BQ1V16MG
EAGLE BURGMANN CARTEX IKA DN 20 E1 MECHANICAL SEAL ASSEMBLY Q1Q1V16MG BQ1V16MG
$779.99
quality
FLOWSERVE LE 3C 2375ST3 MECHANICAL SEAL 2 BORE
FLOWSERVE LE 3C 2375ST3 MECHANICAL SEAL 2 BORE
$199.99
quality
Crane Deming 0084881 Mechanical seal PS 756V 74898800 New
Crane Deming 0084881 Mechanical seal PS 756V 74898800 New
$49.99
quality
ACE O PAX CHEMPLAST MECHANICAL PACKINGS SEALS 1 5 8 X 2 3 8 3 8 5 RINGS
ACE O PAX CHEMPLAST MECHANICAL PACKINGS SEALS 1 5 8 X 2 3 8 3 8 5 RINGS
$40.00
quality
EAGLE BURGMANN CARTEX DN 20 E1 MECHANICAL SEAL ASSEMBLY Q1Q1V16MG BQ1V16MG
EAGLE BURGMANN CARTEX DN 20 E1 MECHANICAL SEAL ASSEMBLY Q1Q1V16MG BQ1V16MG
$249.99
quality
ACE O PAX CHEMPLAST MECHANICAL PACKINGS SEALS 1 1 8 X 1 3 4 5 16 5 RINGS
ACE O PAX CHEMPLAST MECHANICAL PACKINGS SEALS 1 1 8 X 1 3 4 5 16 5 RINGS
$30.00
quality
CHESTERTON 714 P N 044820 Ceramic Mechanical Seal 65 mm
CHESTERTON 714 P N 044820 Ceramic Mechanical Seal 65 mm
$29.99
quality
Pillar DNS Dai Nippon Screen Mechanical Shaft Seal 10625 OD 8 ID
Pillar DNS Dai Nippon Screen Mechanical Shaft Seal 10625 OD 8 ID
$26.99
quality
CHESTERTON 714 P N 044820 Ceramic Mechanical Seal 65 mm
CHESTERTON 714 P N 044820 Ceramic Mechanical Seal 65 mm
$22.99
quality
NEW INGERSOLL RAND 60514130 CPM10466B MECHANICAL SEAL G65 1 1 2 IN D444771
NEW INGERSOLL RAND 60514130 CPM10466B MECHANICAL SEAL G65 1 1 2 IN D444771
$86.00
quality
Grundfos 91868269 Mechanical Seal new
Grundfos 91868269 Mechanical Seal new
$65.00
quality
FLOWTECH 5120 30MM SINGLE MECHANICAL SEAL CARBON VS SS
FLOWTECH 5120 30MM SINGLE MECHANICAL SEAL CARBON VS SS
$45.00
quality
Test Titan mechanical test plug 3 size Seals deeper than other plugs NEW
Test Titan mechanical test plug 3 size Seals deeper than other plugs NEW
$3.00
quality
EAGLE BURGMANN CARTEX DN 20 E1 MECHANICAL SEAL ASSEMBLY 14404 BQ1V16MG BUKA22
EAGLE BURGMANN CARTEX DN 20 E1 MECHANICAL SEAL ASSEMBLY 14404 BQ1V16MG BUKA22
$759.99
quality
Mechanical seal for 875 7 8 pump shaft Ingersoll Flowserve US Seal
Mechanical seal for 875 7 8 pump shaft Ingersoll Flowserve US Seal
$24.99
quality
JOHN CRANE MC680 0621 TYPE 680 MECHANICAL BELLOWS 1 3 4 IN PUMP SEAL B45
JOHN CRANE MC680 0621 TYPE 680 MECHANICAL BELLOWS 1 3 4 IN PUMP SEAL B45
$250.00
quality
JOHN CRANE MECHANICAL SEAL HOUSING TYPE 2800 PART  M381 53
JOHN CRANE MECHANICAL SEAL HOUSING TYPE 2800 PART M381 53
$299.99
quality
1 NEW EGG 604BAC P 32 900122 32 SEALOL MECHANICAL SHAFT SEAL ASSEMBLY NIB
1 NEW EGG 604BAC P 32 900122 32 SEALOL MECHANICAL SHAFT SEAL ASSEMBLY NIB
$79.99
quality
John Crane Mechanical Seal 30 repair kit 1382829 DB1371 300 7854 BR6426662 001
John Crane Mechanical Seal 30 repair kit 1382829 DB1371 300 7854 BR6426662 001
$79.00
quality
John Crane Mechanical Seal 175 type 21 Part  B04895
John Crane Mechanical Seal 175 type 21 Part B04895
$179.00
quality
John Crane Mechanical Seal 275 type 2 Part  B84387 full seal assembly
John Crane Mechanical Seal 275 type 2 Part B84387 full seal assembly
$199.00
quality
Dayton Mechanical Shaft Seal PN 1R315 Type 16 5 8 inch dia shaft size 406 seal
Dayton Mechanical Shaft Seal PN 1R315 Type 16 5 8 inch dia shaft size 406 seal
$9.50
quality
John Crane Mechanical Seal 250 Type 1 0667014 B36459 CF SP 70707 1
John Crane Mechanical Seal 250 Type 1 0667014 B36459 CF SP 70707 1
$109.00
quality
Flow Serve Mechanical Seal 20 Type RO Y5FJ20000L33 1093902 repair kit
Flow Serve Mechanical Seal 20 Type RO Y5FJ20000L33 1093902 repair kit
$75.00
quality
NEW JOHN CRANE 2625 MECHANICAL DOUBLE ROW SEAL COLLAR D26259630500
NEW JOHN CRANE 2625 MECHANICAL DOUBLE ROW SEAL COLLAR D26259630500
$29.99
quality
Flow Serve Mechanical Seal 175 Type GSS 14 1394089 repair kit RSCPX1750ECXVS
Flow Serve Mechanical Seal 175 Type GSS 14 1394089 repair kit RSCPX1750ECXVS
$62.00
quality
NEW PPC MECHANICAL SEAL 1 1 2 P 3F 316 VITON 10 CAR SC HC 18 8 1500 P3F SP 1 P
NEW PPC MECHANICAL SEAL 1 1 2 P 3F 316 VITON 10 CAR SC HC 18 8 1500 P3F SP 1 P
$118.00
quality
MSR MECHANICAL SEAL REPAIR SEAL 40MM MSR 40 ROTATING BELLOW
MSR MECHANICAL SEAL REPAIR SEAL 40MM MSR 40 ROTATING BELLOW
$24.95
quality
MSR MECHANICAL SEAL REPAIR SEAL 40MM MSR 40 WITH STATIONARY SEAT
MSR MECHANICAL SEAL REPAIR SEAL 40MM MSR 40 WITH STATIONARY SEAT
$34.95
quality
MECHANICAL SEAL REPAIR 154719 SHAFT SIZE 3000
MECHANICAL SEAL REPAIR 154719 SHAFT SIZE 3000
$175.00
quality
MECHANICAL SEAL REPAIR 1 3 8 ROTATING ASSEMBLY SEAL TYPE T81T
MECHANICAL SEAL REPAIR 1 3 8 ROTATING ASSEMBLY SEAL TYPE T81T
$40.00
quality
BURGMANN MOD M3 45 00R SEAL MECHANICAL
BURGMANN MOD M3 45 00R SEAL MECHANICAL
$175.00
quality
MECHANICAL SEAL REPAIR KIT 1 3 4 ROTATING BELLOW SEAL TYPE MSR40
MECHANICAL SEAL REPAIR KIT 1 3 4 ROTATING BELLOW SEAL TYPE MSR40
$40.00
quality
MSR MECHANICAL SEAL REPAIR BLACKCLAWSON
MSR MECHANICAL SEAL REPAIR BLACKCLAWSON
$15.00
quality
MSR MECHANICAL SEAL REPAIR SEAL 1 1 2 TYPE T1 SEAL ASSEMBLY
MSR MECHANICAL SEAL REPAIR SEAL 1 1 2 TYPE T1 SEAL ASSEMBLY
$15.00
quality
DELTA MECHANICAL SEAL REPAIR AC300X3000E REPAIR KIT
DELTA MECHANICAL SEAL REPAIR AC300X3000E REPAIR KIT
$60.00
quality
MECHANICAL SEAL REPAIR 416331 P 50 2
MECHANICAL SEAL REPAIR 416331 P 50 2
$150.00
quality
MSR MECHANICAL SEAL REPAIR SEAL 2 TYPE T 1A SEAL ASSEMBLY
MSR MECHANICAL SEAL REPAIR SEAL 2 TYPE T 1A SEAL ASSEMBLY
$20.00
quality
INDUSTRIAL MECHANICAL SEAL 225 RO  BELLOW SEAL
INDUSTRIAL MECHANICAL SEAL 225 RO BELLOW SEAL
$100.00
quality
DELTA MECHANICAL SEALS MOD 3000 KIT 2PCSTAT SIZE 2500 ALLOY 316
DELTA MECHANICAL SEALS MOD 3000 KIT 2PCSTAT SIZE 2500 ALLOY 316
$125.00
quality
MSR MECHANICAL SEAL REPAIR BACK CLAWSON SEAL ASSEMBLY SSSCSCVITON
MSR MECHANICAL SEAL REPAIR BACK CLAWSON SEAL ASSEMBLY SSSCSCVITON
$50.00
quality
DELTA MECHANICAL SEALS MOD AV30003000E
DELTA MECHANICAL SEALS MOD AV30003000E
$200.00
quality
MSR MECHANICAL SEAL REPAIR TYPE GGP 21
MSR MECHANICAL SEAL REPAIR TYPE GGP 21
$20.00
quality
MSR MECHANICAL SEAL REPAIR BLACK CLAWSON SEAL ASSEMBLY SS T C SCC VITON
MSR MECHANICAL SEAL REPAIR BLACK CLAWSON SEAL ASSEMBLY SS T C SCC VITON
$25.00
quality
MSR MECHANICAL SEAL REPAIR SIZE 1 3 4 ROTATING BELLOW SSCARBONVITON
MSR MECHANICAL SEAL REPAIR SIZE 1 3 4 ROTATING BELLOW SSCARBONVITON
$25.00
quality
MSR MECHANICAL SEAL REPAIR MOD CSCPX1125EAXVS
MSR MECHANICAL SEAL REPAIR MOD CSCPX1125EAXVS
$125.00
quality
MSR MECHANICAL SEAL REPAIR SIZE 1 3 4 TYPE MSR 40 ROTATING BELLOW
MSR MECHANICAL SEAL REPAIR SIZE 1 3 4 TYPE MSR 40 ROTATING BELLOW
$25.00
quality
Worthington Mechanical Seal 1 3 8 Bore 2 OD 1 7 16 Length New
Worthington Mechanical Seal 1 3 8 Bore 2 OD 1 7 16 Length New
$49.99
quality
John Crane Inc HOU 288 APLC Mechanical Seal Seat
John Crane Inc HOU 288 APLC Mechanical Seal Seat
$60.00
quality
NEW JOHN CRANE 609SVC P 26 1 5 8IN MECHANICAL SEAL ASSEMBLY D398749
NEW JOHN CRANE 609SVC P 26 1 5 8IN MECHANICAL SEAL ASSEMBLY D398749
$236.00
quality
Mechanical seal 4 1 2 inch BM 92008 Double Dura Durametallic Unused
Mechanical seal 4 1 2 inch BM 92008 Double Dura Durametallic Unused
$450.00
quality
 56271 CF 8M SEAL MECHANICAL GLAND NEW
56271 CF 8M SEAL MECHANICAL GLAND NEW
$116.21
quality
Anchor 03003 F1SS Rota Face Mechanical Seal 1 7 8 Bshgs
Anchor 03003 F1SS Rota Face Mechanical Seal 1 7 8 Bshgs
$49.00
quality
 GP GOULDS PUMPS 56271 CF 8M SEAL MECHANICAL GLAND NEW
GP GOULDS PUMPS 56271 CF 8M SEAL MECHANICAL GLAND NEW
$123.71
quality
Anchor Rota Face Mechanical Seal 01616 F2SS Lot of 2
Anchor Rota Face Mechanical Seal 01616 F2SS Lot of 2
$119.00
quality
Anchor A387 Rota Face Mechanical Seal 1 3 4 Bshg  Spring
Anchor A387 Rota Face Mechanical Seal 1 3 4 Bshg Spring
$49.00
quality
Mechanical seal Metal bellows 2in ID T 15WT John Crane Unused
Mechanical seal Metal bellows 2in ID T 15WT John Crane Unused
$275.00
quality
Mechanical seal Metal bellows 2in ID T 15WT John Crane Unused
Mechanical seal Metal bellows 2in ID T 15WT John Crane Unused
$275.00
quality
Mechanical seal Metal bellows 1 3 4in ID 15WT John Crane Unused
Mechanical seal Metal bellows 1 3 4in ID 15WT John Crane Unused
$225.00
quality
Mechanical seal Metal bellows 1 3 4in ID 15WT John Crane Unused
Mechanical seal Metal bellows 1 3 4in ID 15WT John Crane Unused
$200.00
quality
Mechanical seal 125 in ID Type 1 John Crane Unused
Mechanical seal 125 in ID Type 1 John Crane Unused
$85.00
quality
Mechanical seal 1 3 4in ID Type 1 John Crane Unused
Mechanical seal 1 3 4in ID Type 1 John Crane Unused
$145.00
quality
ITT A C Pump Mechanical Seal 52 117 036 802 US Seal PS 1674
ITT A C Pump Mechanical Seal 52 117 036 802 US Seal PS 1674
$59.00
quality
New VGS 1125 Mechanical seal for Armstrong Series 4300 pumps 975002 304
New VGS 1125 Mechanical seal for Armstrong Series 4300 pumps 975002 304
$350.00
quality
Chesterton 13075m Mechanical Seal 665000 Size 24 75mm 30 PWO 12 x 10x 17
Chesterton 13075m Mechanical Seal 665000 Size 24 75mm 30 PWO 12 x 10x 17
$100.00
quality
Chesterton 1053017 Mechanical Seal 665406 drawing  89723 restriciton bushing
Chesterton 1053017 Mechanical Seal 665406 drawing 89723 restriciton bushing
$48.00
quality
Pac Seal 175 Type 21 Single Spring Mechanical Seal 5AW535VXFZF T21 14
Pac Seal 175 Type 21 Single Spring Mechanical Seal 5AW535VXFZF T21 14
$138.00
quality
NEW 9612711903 SS mechanical pump seal kit CL Pump DG SIC SIC V 3175mm 100590
NEW 9612711903 SS mechanical pump seal kit CL Pump DG SIC SIC V 3175mm 100590
$27.99
quality
Jabsco Seal Mechanical Carbon Nitrile 18753 0245
Jabsco Seal Mechanical Carbon Nitrile 18753 0245
$41.96
quality
John Crane Cartridge Spilt mechanical seal 475 type 3710 38 812255 76N2
John Crane Cartridge Spilt mechanical seal 475 type 3710 38 812255 76N2
$245.00
quality
Grundfos 91868269 Mechanical Seal new
Grundfos 91868269 Mechanical Seal new
$129.99
quality
GS 446 VR2S2 Mechanical Seal new
GS 446 VR2S2 Mechanical Seal new
$129.99
quality
FS 436 VR2S2 Mechanical Seal new
FS 436 VR2S2 Mechanical Seal new
$129.99
quality
31535 Mechanical Pump Shaft Seal Shaft Packing Size 1 New
31535 Mechanical Pump Shaft Seal Shaft Packing Size 1 New
$15.00
quality
Durametallic Dura Seal VRA pusher type mechanical seal NOS
Durametallic Dura Seal VRA pusher type mechanical seal NOS
$399.00
quality
JOHN CRANE WEIR HAZLETON MECHANICAL SEAL 832147 016 B18482
JOHN CRANE WEIR HAZLETON MECHANICAL SEAL 832147 016 B18482
$115.00
quality
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Mechanical Seal

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Mechanical Seals

Mechanical+Seal

Using Ultrananocrystalline Diamond To Improve Mechanical Seal Performance

A mechanical seal is a critical component whose useful life significantly impacts the overall reliability and robustness of pump or centrifugal compressor. Unscheduled or premature failure of the seal leads to increased maintenance and increased overall equipment costs to the user. The overall performance of a mechanical seal often is most affected by the performance of the faces and the intervening lubricating film. This primary element of a mechanical seal represents a classic problem in the science of tribology, the study of friction, wear and lubrication.

The demands placed on seal faces require careful attention to the issues of wear resistance, chemical compatibility, mechanical and thermal properties—all of which are determined by the end use application and overall seal design. When a mechanical seal is used in a pump, the liquid in the pump is used to cool and lubricate the seal faces. The seal faces are in sliding contact and prevent the liquid in the pump from reaching atmosphere. This contact also generates frictional heat that must be removed from the seal faces. Failure to remove this unwanted heat often results in the boiling of the lubricating liquid film at the seal faces, usually leaving a deleterious residue and causing premature failure of elastomeric components in the seals (static-secondary seals). Both of these undesirable effects of elevated temperatures lead to premature seal failure.

The ability to maintain coolant on the seal face is even more critical when compounded by the demands associated with the pumping of abrasive media or a pump’s ability to withstand intermittent and unscheduled coolant loss. The ability to run two hard-faced seal materials such as SiC against each other often is desirable but not practical due to the premature failures that result from elevated temperatures caused by friction at the seal interface.

In the case of a centrifugal gas compressor, a noncontacting mechanical seal is used to contain the gas within the machine. A lift mechanism, such as spiral grooves, is included in the design of the seal. During operation the seal faces do not make contact except at startup and shutdown. The intense frictional heat occurring at this time must be controlled or face damage can occur.

Based on the benefits nature’s hardest substance would appear to offer for this application, the idea of using the diamond as a wear resistant face material in seals is not new. Diamond also possesses many other attractive properties, including extremely high thermal conductivity and chemical resistance. Unfortunately, previous attempts at integrating diamond into seal faces failed due to difficulties in ensuring that the diamond face presented the necessary surface finish required for such a demanding tribological application. Following extensive research and development and improvements in equipment and processes, those problems appear to have been solved.

Today, a new form of diamond with ultrananocrystalline grains has entered the industrial arena. Invented at Argonne National Laboratory and commercialized for seals by John Crane, Inc. and Advanced Diamond Technologies, Inc., UNCD?, as it is commercially known, provides the surface roughness typical of normal, unprocessed seal. UNCD has been dynamically tested and shown to signifi- cantly reduce the frictional heat and increase the life of the seal faces in accelerated wear. The work highlighted in this article was completed, in part, by funding from the National Science Foundation and the Department of Energy.

Manufacturing hurdles

One of the major obstacles in providing a diamond-treated surface for a mechanical seal is maintaining the surface flatness and roughness necessary to achieve sealing. Early work in diamond surfacing placed extreme demands on finishing and polishing the diamond to meet the required metrology and geometric specifications of a seal face. Surfaces were rough and had a high degree of waviness. Additional lapping of the diamond surface to achieve sealing could not be done cost-effectively due to the hardness of diamond. Consequently, many researchers abandoned the idea of using diamond as a surface for seals.

The development of ultrananocrystalline diamond (UNCD), though, generated renewed interest in diamondtreated seal faces. The process demonstrated that the base material could be treated with diamond without changing its original flatness. This was a major breakthrough in the manufacturing technology for diamond-structured surfaces. At last, diamond could be applied to a seal face without any further work to achieve the desired flatness for sealing fluids. Moreover, UNCD, unlike other diamond films, has nanometer-scale roughness that allows as-deposited UNCD to have sufficient smoothness so that it doesn’t degrade a soft counterface. In other words, UNCD works in both hard on hard and hard on soft sealing applications.

Still, there was an additional obstacle to overcome. Work to this point was done to transfer this laboratory-scale process to meet the demand of seal production. New equipment and processes had to be designed to handle a larger volume of seals at one time. Once this was done, the new equipment and processes had to be validated. Tests were run on production parts and compared to those run on the smaller scale equipment. Continuous testing confirmed that the production parts met the early results for friction and wear testing of parts manufactured on the smaller scale equipment.

Friction testing

Friction plays an important part in the success or failure of a set of seal faces. Not all materials make good seal faces. Some materials have properties that hold heat in the seal face, while others wear too much. Applying diamond to a seal face reduces both friction and wear. One of the best substrate materials for diamond is silicon carbide. Silicon carbide and diamond have very similar material properties. Results of friction testing for UNCD on a SiC face are as follows:

Carbon running against UNCD on silicon carbide μ = 0.07

Silicon carbide running against UNCD on silicon carbide μ = 0.04

The results for carbon versus UNCD on silicon carbide were expected. This is a normal value for friction in seal design work. The results for silicon carbide versus UNCD on silicon carbide were very good. When silicon carbide runs against itself without any diamond treatment, the coefficient of friction is greater than 0.1. For those applications requiring hard-on-hard seal faces, the application of a diamond-treated seal face is a major improvement. Several groups of seal faces have been tested, resulting in the same friction values.

Dynamic testing

An important step in qualifying materials for a mechanical seal is dynamic testing in hot water. This test involves running a 1.375 diameter seal in 250 F water at 100 psig and 3450 rpm. At these conditions, the pressure-velocity value for the seal is 170,000 psi x ft/min. This test in hot water is very demanding of the seal. Each test run consists of running a group of four pumps, three fi tted with seals treated with diamond and one without a treated surface. The results of hot-water testing were outstanding for the diamond-treated seals. Very minimal or no measureable wear occurred over the 100-hour test. The untreated silicon carbide seals in each case failed due to heavy wear across the entire seal face.

These results were typical for each test run. The UNCD-treated surfaces were in excellent condition with very little carbon wear. The untreated seal had high wear for both the carbon and silicon carbide seal faces.

An interesting measurement taken after testing was surface flatness. The diamond-treated
mechanical seal
had no change in surface flatness during testing. The untreated silicon carbide had an increase of 240 microinches. This is an indication that the untreated surface was running hotter than the diamond-treated surface. Continued increases in flatness or surface waviness will lead to unwanted seal leakage and wear.

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