Mechanical Seal

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New John Crane Mechanical Seal 21271111 SE2 77 QREG 302747 81716769
New John Crane Mechanical Seal 21271111 SE2 77 QREG 302747 81716769
$699.30
quality
LOT 2 NEW 205032101 MECHANICAL SEAL D337597
LOT 2 NEW 205032101 MECHANICAL SEAL D337597
$10.49
quality
FACTORY SEALED GENERAL ELECTRIC SDOM1A TYPE STDA OPERATING MECHANISM MODEL 2
FACTORY SEALED GENERAL ELECTRIC SDOM1A TYPE STDA OPERATING MECHANISM MODEL 2
$50.00
quality
LOT 2 NEW 205032101 MECHANICAL SEAL D337602
LOT 2 NEW 205032101 MECHANICAL SEAL D337602
$10.43
quality
Franklin Mille Stellite Mechanical Seal C816874 DF 35 ID 45 OD NEW
Franklin Mille Stellite Mechanical Seal C816874 DF 35 ID 45 OD NEW
$50.00
quality
GOULD 10K38 VITON MECHANICAL SHAFT SEAL ASSEMBLY NIB
GOULD 10K38 VITON MECHANICAL SHAFT SEAL ASSEMBLY NIB
$64.98
quality
Flexibox Meta Stream Mechanical Seal SB8P 0437 99CS H100 NIB
Flexibox Meta Stream Mechanical Seal SB8P 0437 99CS H100 NIB
$75.00
quality
John Crane 37FS Mechanical Split Seal Kit
John Crane 37FS Mechanical Split Seal Kit
$313.95
quality
VIKING PUMP MECHANICAL SEAL ASSEMBLY 2 473 003 999
VIKING PUMP MECHANICAL SEAL ASSEMBLY 2 473 003 999
$79.00
quality
USED US SEAL PS 4263 MECHANICAL PUMP SEAL KIT
USED US SEAL PS 4263 MECHANICAL PUMP SEAL KIT
$44.00
quality
NEW JABSCO 9023 0000 MECHANICAL SEAL 90230000
NEW JABSCO 9023 0000 MECHANICAL SEAL 90230000
$65.95
quality
Q26180Y35 MECHANICAL PUMP SEAL
Q26180Y35 MECHANICAL PUMP SEAL
$75.00
quality
NEW FLOWSERVE C2CPX1375ECXEB MECHANICAL SEAL F ISC2 PX 1375 5Z5T
NEW FLOWSERVE C2CPX1375ECXEB MECHANICAL SEAL F ISC2 PX 1375 5Z5T
$189.99
quality
BURGMANN MECHANICAL SEAL MG1S20 32 Z NIB
BURGMANN MECHANICAL SEAL MG1S20 32 Z NIB
$95.00
quality
14mm Coiled Spring Rubber Bellow Pump Mechanical Seal 301 12
14mm Coiled Spring Rubber Bellow Pump Mechanical Seal 301 12
$9.32
quality
ARMSTRONG 810120009 186499 3 4 MECHANICAL SEAL 178506
ARMSTRONG 810120009 186499 3 4 MECHANICAL SEAL 178506
$162.00
quality
Dura 1 Mechanical Seal 113965
Dura 1 Mechanical Seal 113965
$30.00
quality
JOHN CRANE TYPE 9 MECHANICAL WEDGE SEAL  1 5 16 SHAFT
JOHN CRANE TYPE 9 MECHANICAL WEDGE SEAL 1 5 16 SHAFT
$52.00
quality
NOS BURGMANN ISO 9001 M32N 70 00 R MECHANICAL SEAL
NOS BURGMANN ISO 9001 M32N 70 00 R MECHANICAL SEAL
$85.00
quality
BURGMANN 1 3 16 TYPE 21 SINGLE SPRING MECHANICAL SEAL CARBON SC VITON 316SS
BURGMANN 1 3 16 TYPE 21 SINGLE SPRING MECHANICAL SEAL CARBON SC VITON 316SS
$439.70
quality
BURGMANN 1 5 8 CARTEX MECHANICAL SEAL SC SC FACES 316SS GLAND VITON O RINGS
BURGMANN 1 5 8 CARTEX MECHANICAL SEAL SC SC FACES 316SS GLAND VITON O RINGS
$786.00
quality
BURGMANN 3 15 16 HR321 SINGLE MECHANICAL SEAL SIL SIL FACES F91131000
BURGMANN 3 15 16 HR321 SINGLE MECHANICAL SEAL SIL SIL FACES F91131000
$4,073.50
quality
EGG SEALOL 2 11 16 EZ SPLIT MECHANICAL SEAL C S VITON 704942
EGG SEALOL 2 11 16 EZ SPLIT MECHANICAL SEAL C S VITON 704942
$1,389.30
quality
EGG SEALOL 3 FULLY SPLIT MECHANICAL SEAL C S VITON 81225 48N1 597ALC SBF38548
EGG SEALOL 3 FULLY SPLIT MECHANICAL SEAL C S VITON 81225 48N1 597ALC SBF38548
$1,548.85
quality
EGG SEALOL 4 1 2 EZ SPLIT MECHANICAL SEAL C S VITON 704082
EGG SEALOL 4 1 2 EZ SPLIT MECHANICAL SEAL C S VITON 704082
$2,007.50
quality
FLOWSERVE MECHANICAL SEAL REPAIR KIT RK375489 NIB
FLOWSERVE MECHANICAL SEAL REPAIR KIT RK375489 NIB
$108.95
quality
JOHN CRANE 1750 T 1 MECHANICAL SEAL MSC 1152 NSFB
JOHN CRANE 1750 T 1 MECHANICAL SEAL MSC 1152 NSFB
$179.95
quality
JOHN CRANE 1125 88 MECHANICAL SEAL H SP 6017 RBLT
JOHN CRANE 1125 88 MECHANICAL SEAL H SP 6017 RBLT
$249.95
quality
MECHANICAL SEAL REPAIR OG 40MM STATIONARY SEAT NSFB
MECHANICAL SEAL REPAIR OG 40MM STATIONARY SEAT NSFB
$6.95
quality
New Goulds Pump 10K24 Mechanical Seal Kit A4
New Goulds Pump 10K24 Mechanical Seal Kit A4
$95.50
quality
type 21 mechanical seal
type 21 mechanical seal
$5.00
quality
AG060927 TOOL MECHANICAL SEAL INS AGCO MASSEY FERGUSON 2505SDG TERRAGATOR TRAC
AG060927 TOOL MECHANICAL SEAL INS AGCO MASSEY FERGUSON 2505SDG TERRAGATOR TRAC
$56.26
quality
8pcs Mechanical Water Pump Seal Kits SS04 baxr 180 0240 Circulating 24MM
8pcs Mechanical Water Pump Seal Kits SS04 baxr 180 0240 Circulating 24MM
$39.95
quality
CARTEX AST 1 750 MECHANICAL SEAL SCT175011CXCXBS
CARTEX AST 1 750 MECHANICAL SEAL SCT175011CXCXBS
$1,400.00
quality
John Crane type 9 Seal B31683 or Blackmer Mechanical Seal 332203
John Crane type 9 Seal B31683 or Blackmer Mechanical Seal 332203
$425.00
quality
Dayton Mechanical Shaft Seal Type 16 1R299 New
Dayton Mechanical Shaft Seal Type 16 1R299 New
$7.12
quality
NEW EGG SEALOL MECHANICAL SEAL A26 680 1 7 16
NEW EGG SEALOL MECHANICAL SEAL A26 680 1 7 16
$42.50
quality
DURA SEAL KA3R1437K33 MECHANICAL SEAL
DURA SEAL KA3R1437K33 MECHANICAL SEAL
$55.00
quality
NEW GORMAN RUPP MECHANICAL SEAL 25271 942 NEW IN FACTORY BOX
NEW GORMAN RUPP MECHANICAL SEAL 25271 942 NEW IN FACTORY BOX
$59.99
quality
CHESTERTON 255R OS 17SA SSC CBS MECHANICAL SEAL ITEM 131805 NEW IN BOX
CHESTERTON 255R OS 17SA SSC CBS MECHANICAL SEAL ITEM 131805 NEW IN BOX
$111.25
quality
Mechanical Seals MS 80145
Mechanical Seals MS 80145
$129.00
quality
NEW JOHN CRANE 215 MECHANICAL PUMP SEAL 1750 B884 18 DRAWING CFSP47469 A22
NEW JOHN CRANE 215 MECHANICAL PUMP SEAL 1750 B884 18 DRAWING CFSP47469 A22
$44.95
quality
Delta AV30001750A Mechanical Seal Model 3000 Size 1750 NIB
Delta AV30001750A Mechanical Seal Model 3000 Size 1750 NIB
$239.96
quality
DURAMETALLIC 12104 DURA SEAL SINGLE INSIDE PUSHER TYPE RO MECHANICAL SEAL 125
DURAMETALLIC 12104 DURA SEAL SINGLE INSIDE PUSHER TYPE RO MECHANICAL SEAL 125
$249.99
quality
NEW WELCH MECHANICAL SEAL KIT 1401E 5 8 SHAFT
NEW WELCH MECHANICAL SEAL KIT 1401E 5 8 SHAFT
$50.25
quality
PAC SEAL MECHANICAL PUMP SEAL PS 357 1 SHAFT SIZE NEW
PAC SEAL MECHANICAL PUMP SEAL PS 357 1 SHAFT SIZE NEW
$25.00
quality
PAC SEAL MECHANICAL PUMP SEAL PS 103 075 SHAFT SIZE NEW
PAC SEAL MECHANICAL PUMP SEAL PS 103 075 SHAFT SIZE NEW
$20.00
quality
MECHANICAL PUMP SEAL 0875 SHAFT SIZE NEW
MECHANICAL PUMP SEAL 0875 SHAFT SIZE NEW
$25.00
quality
NEW T880 1750V MECHANICAL SEAL D387942
NEW T880 1750V MECHANICAL SEAL D387942
$113.53
quality
FLOWSERVE MECHANICAL SEAL 419514  875 RA SIZE NEW
FLOWSERVE MECHANICAL SEAL 419514 875 RA SIZE NEW
$74.99
quality
John Crane Mechanical Seal 1 B75050 type 1 0666552
John Crane Mechanical Seal 1 B75050 type 1 0666552
$96.00
quality
Roten Type 2 Mechanical Seal 5128 0349 2401 00 Food Grade
Roten Type 2 Mechanical Seal 5128 0349 2401 00 Food Grade
$59.99
quality
NOS ASI Mechanical Seal Assembly ASI Model 590 Size 1375 13 8
NOS ASI Mechanical Seal Assembly ASI Model 590 Size 1375 13 8
$150.00
quality
NOS ASI Mechanical Seal Assembly ASI Model 595 Size 1375 13 8
NOS ASI Mechanical Seal Assembly ASI Model 595 Size 1375 13 8
$150.00
quality
NOS ASI Mechanical Seal Assembly ASI Model 600 Size 1375 13 8
NOS ASI Mechanical Seal Assembly ASI Model 600 Size 1375 13 8
$150.00
quality
Garlock PK Mechanical Seal 3 4 Shaft 70068 0007 NEW
Garlock PK Mechanical Seal 3 4 Shaft 70068 0007 NEW
$19.79
quality
NEW JOHN CRANE FSP 1958 MECHANICAL SEAL 4IN D388539
NEW JOHN CRANE FSP 1958 MECHANICAL SEAL 4IN D388539
$447.53
quality
NEW JOHN CRANE FSP 1958 MECHANICAL SEAL 4IN D388544
NEW JOHN CRANE FSP 1958 MECHANICAL SEAL 4IN D388544
$447.53
quality
Gorman Rupp Seal Kit new missing part number Self Lubricating Mechanical Seal
Gorman Rupp Seal Kit new missing part number Self Lubricating Mechanical Seal
$49.99
quality
PPC MECHANICAL SEAL 69859 2 1 2 2400S SPLIT DOUBLE CARTRIDGE SEAL NIB
PPC MECHANICAL SEAL 69859 2 1 2 2400S SPLIT DOUBLE CARTRIDGE SEAL NIB
$178.00
quality
PPC MECHANICAL SEAL 69849 2 1 2 2400S SPLIT DOUBLE CARTRIDGE SEAL NIB
PPC MECHANICAL SEAL 69849 2 1 2 2400S SPLIT DOUBLE CARTRIDGE SEAL NIB
$178.00
quality
PPC MECHANICAL SEAL 69750 43 1200S SPLIT DOUBLE MECHANICAL SEAL NIB
PPC MECHANICAL SEAL 69750 43 1200S SPLIT DOUBLE MECHANICAL SEAL NIB
$178.00
quality
PPC MECHANICAL SEAL 69842 2 1 2 2400S SPLIT DOUBLE CARTRIDGE SEAL NIB
PPC MECHANICAL SEAL 69842 2 1 2 2400S SPLIT DOUBLE CARTRIDGE SEAL NIB
$178.00
quality
PPC MECHANICAL SEAL 69819 4 5 8 1200S SPLIT DOUBLE MECHANICAL SEAL NIB
PPC MECHANICAL SEAL 69819 4 5 8 1200S SPLIT DOUBLE MECHANICAL SEAL NIB
$178.00
quality
PPC MECHANICAL SEAL 69912 2 1 2 2400S SPLIT DOUBLE CARTRIDGE SEAL NIB
PPC MECHANICAL SEAL 69912 2 1 2 2400S SPLIT DOUBLE CARTRIDGE SEAL NIB
$178.00
quality
PPC MECHANICAL SEAL 69826 2 1 2 1200S SPLIT DOUBLE CARTRIDGE SEAL NIB
PPC MECHANICAL SEAL 69826 2 1 2 1200S SPLIT DOUBLE CARTRIDGE SEAL NIB
$178.00
quality
PPC MECHANICAL SEAL 69744 4 5 8 1200S SPLIT MECHANICAL SEAL NIB
PPC MECHANICAL SEAL 69744 4 5 8 1200S SPLIT MECHANICAL SEAL NIB
$133.50
quality
PPC MECHANICAL SEAL 69920 3 2400S SPLIT DOUBLE MECHANICAL SEAL NIB
PPC MECHANICAL SEAL 69920 3 2400S SPLIT DOUBLE MECHANICAL SEAL NIB
$178.00
quality
PPC MECHANICAL SEAL 69834 2 1 2 1200S SPLIT DOUBLE CARTRIDGE SEAL NIB
PPC MECHANICAL SEAL 69834 2 1 2 1200S SPLIT DOUBLE CARTRIDGE SEAL NIB
$178.00
quality
PPC MECHANICAL SEAL 69926 3 2400S SPLIT DOUBLE MECHNICAL SEAL NIB
PPC MECHANICAL SEAL 69926 3 2400S SPLIT DOUBLE MECHNICAL SEAL NIB
$178.00
quality
PPC MECHANICAL SEAL 69752 4 5 8 1200S SPLIT MECHANICAL SEAL NIB
PPC MECHANICAL SEAL 69752 4 5 8 1200S SPLIT MECHANICAL SEAL NIB
$178.00
quality
Anchor Rota Face Mechanical Seals 1 1 8 0183A01 F2SSN2 NIB
Anchor Rota Face Mechanical Seals 1 1 8 0183A01 F2SSN2 NIB
$49.99
quality
Burks Mechanical Pump Seal 08514 C P NIB
Burks Mechanical Pump Seal 08514 C P NIB
$49.99
quality
Worthington 31446 00 Mechanical Seal Assembly
Worthington 31446 00 Mechanical Seal Assembly
$195.00
quality
NEW DURAMETALLIC 16530 SINGLE OUTSIDE RO TT DURA MECHANICAL SEAL KE
NEW DURAMETALLIC 16530 SINGLE OUTSIDE RO TT DURA MECHANICAL SEAL KE
$54.00
quality
Durametallic Mechanical Pump Seal Rebuild Repair Kit 1847 ID
Durametallic Mechanical Pump Seal Rebuild Repair Kit 1847 ID
$99.99
quality
IMPCO 3 1 2 MECHANICAL SEAL 94723 BACK TO BACK DOUBLE CARTRIDGE PARTS ONLY
IMPCO 3 1 2 MECHANICAL SEAL 94723 BACK TO BACK DOUBLE CARTRIDGE PARTS ONLY
$89.00
quality
100 Plastic Security Pull Tight Seals With Metal Locking Mechanism
100 Plastic Security Pull Tight Seals With Metal Locking Mechanism
$22.50
quality
BURGMANN 0000 1451 MECHANICAL SEAL AS PICTURED
BURGMANN 0000 1451 MECHANICAL SEAL AS PICTURED
$59.00
quality
Skidmore Mechanical Pump Seal Kit Type S 142 540525 8 NEW Surplus
Skidmore Mechanical Pump Seal Kit Type S 142 540525 8 NEW Surplus
$41.00
quality
uxcell Universal Oil Resistant Water Cooling Pump Mechanical Seal 30x52x10mm
uxcell Universal Oil Resistant Water Cooling Pump Mechanical Seal 30x52x10mm
$8.68
quality
Skidmore Type S Mechanical Pump Seal Kit 142 54058 NEW Surplus
Skidmore Type S Mechanical Pump Seal Kit 142 54058 NEW Surplus
$59.00
quality
New John Crane 3 4 Silicon Carbide Single Mechanical Seal 39121038
New John Crane 3 4 Silicon Carbide Single Mechanical Seal 39121038
$29.99
quality
Mechanical Seal 625 type 21 Silicon Carbide Carbon Silicon Carbide Viton
Mechanical Seal 625 type 21 Silicon Carbide Carbon Silicon Carbide Viton
$52.77
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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