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John Crane 125 mechanical seal Type 21 with Cup MT Seat T21 10
John Crane 125 mechanical seal Type 21 with Cup MT Seat T21 10
$50.00
quality
John Crane type 9 Seal B31683 or Blackmer Mechanical Seal 332203
John Crane type 9 Seal B31683 or Blackmer Mechanical Seal 332203
$825.00
quality
OCHSNER PUMP MECHANICAL SEAL A28 CNY 65 200
OCHSNER PUMP MECHANICAL SEAL A28 CNY 65 200
$100.00
quality
NEW TEKLEEN 10 10 MECHANICAL SEAL D439791
NEW TEKLEEN 10 10 MECHANICAL SEAL D439791
$33.18
quality
Chesterton Mechanical 770 8N Seal Shaft size 1000 Rotary w Seal Ring F3
Chesterton Mechanical 770 8N Seal Shaft size 1000 Rotary w Seal Ring F3
$69.99
quality
John Crane 225 mechanical seal mating ring assembly 930000 36 or 680 930000 36
John Crane 225 mechanical seal mating ring assembly 930000 36 or 680 930000 36
$40.00
quality
Chesterton Mechanical Seal Spare Parts Kit A23357A 12D1Z7 08 25399 F3
Chesterton Mechanical Seal Spare Parts Kit A23357A 12D1Z7 08 25399 F3
$32.99
quality
John Crane 20 mechanical seal B 52 T1 16
John Crane 20 mechanical seal B 52 T1 16
$60.00
quality
Chesterton Mechanical Seal Spare Parts Kit A17792A J 3339 F3
Chesterton Mechanical Seal Spare Parts Kit A17792A J 3339 F3
$29.99
quality
John Crane 30 mechanical seal split mating ring A37 3000 001 9237
John Crane 30 mechanical seal split mating ring A37 3000 001 9237
$37.00
quality
John Crane 30 mechanical seal split mating ring A37 3000 001 1933
John Crane 30 mechanical seal split mating ring A37 3000 001 1933
$34.00
quality
CHESTERTON 880 24 MECHANICAL PUMP SEAL T13018
CHESTERTON 880 24 MECHANICAL PUMP SEAL T13018
$60.00
quality
John Crane B223 66 Mechanical Seal Type 8B1 Size 2750
John Crane B223 66 Mechanical Seal Type 8B1 Size 2750
$429.00
quality
John Crane M108374 Mechanical Seal Type 8B1 Size 3375 Dwg CFSP 20151
John Crane M108374 Mechanical Seal Type 8B1 Size 3375 Dwg CFSP 20151
$449.00
quality
John Crane B982 17 Type 2 Mechanical Seal Drawing FSP14113 Size 2250
John Crane B982 17 Type 2 Mechanical Seal Drawing FSP14113 Size 2250
$199.00
quality
Ingersoll Rand 387M516CX1 Mechanical Gland Seal A7695
Ingersoll Rand 387M516CX1 Mechanical Gland Seal A7695
$999.00
quality
John Crane 175 mechanical seal bellows viton 5850 d17502525850
John Crane 175 mechanical seal bellows viton 5850 d17502525850
$30.00
quality
John Crane 175 mechanical seal primary ring D17513139205
John Crane 175 mechanical seal primary ring D17513139205
$28.00
quality
John Crane 175 mechanical seal collar D17510960550
John Crane 175 mechanical seal collar D17510960550
$30.00
quality
John Crane 48mm mechanical seal 680SFC XXX 048 rotary assembly 20 930000 32
John Crane 48mm mechanical seal 680SFC XXX 048 rotary assembly 20 930000 32
$128.25
quality
John Crane 062 mechanical seal B41448 B57  0666735
John Crane 062 mechanical seal B41448 B57 0666735
$39.00
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
$23.99
quality
Grundfos Mechanical Seal 12 mm
Grundfos Mechanical Seal 12 mm
$59.77
quality
CHESTERTON Stationary Seat for 880 Mechanical Seal 15
CHESTERTON Stationary Seat for 880 Mechanical Seal 15
$14.99
quality
Grundfos Mechanical Seal 16 mm
Grundfos Mechanical Seal 16 mm
$69.77
quality
Chesterton 155 Single Mechanical Seal 2 3 8 Size 17 AFLAS ORings
Chesterton 155 Single Mechanical Seal 2 3 8 Size 17 AFLAS ORings
$75.68
quality
NEW INPRO SEAL 504 0045 MECHANICAL SEAL 2 3 16IN OD 3 4IN ID D246829
NEW INPRO SEAL 504 0045 MECHANICAL SEAL 2 3 16IN OD 3 4IN ID D246829
$41.68
quality
A8 1 New Delta AV30003000e Mechanical Seal
A8 1 New Delta AV30003000e Mechanical Seal
$260.22
quality
JOHN CRANE 3710ALC SBF385 0100 100MM MECHANICAL PUMP SEAL REPAIR KIT B440787
JOHN CRANE 3710ALC SBF385 0100 100MM MECHANICAL PUMP SEAL REPAIR KIT B440787
$350.13
quality
FlowServe mechanical seal collar LE3M2125333 3 316 SS COL
FlowServe mechanical seal collar LE3M2125333 3 316 SS COL
$40.00
quality
NEW JOHN CRANE RSD 1330 MECHANICAL SEAL PUMP PACKING REPLACEMENT PART D440814
NEW JOHN CRANE RSD 1330 MECHANICAL SEAL PUMP PACKING REPLACEMENT PART D440814
$41.18
quality
Durametallic KEMA2125P33 Tungsten Carbide Mechanical Seal Ring
Durametallic KEMA2125P33 Tungsten Carbide Mechanical Seal Ring
$38.30
quality
Large mechanics lot of Vintage automotive National Oil seals Victor In boxes
Large mechanics lot of Vintage automotive National Oil seals Victor In boxes
$19.99
quality
Pkg of 3 Genuine Serfilco P 55 0560 K Chamber Pump Mechanical Seals 5 8 Dia
Pkg of 3 Genuine Serfilco P 55 0560 K Chamber Pump Mechanical Seals 5 8 Dia
$390.99
quality
John Crane Inc B287 69 Mechanical Seal 2 3 8 Dia Rubber Gasket SS Body Type 9
John Crane Inc B287 69 Mechanical Seal 2 3 8 Dia Rubber Gasket SS Body Type 9
$508.00
quality
Chesterton mechanical seal 0625 5 8  05814
Chesterton mechanical seal 0625 5 8 05814
$41.00
quality
1 NIB FLOWSERVE 1802AJCTYP1A112 MECHANICAL SEAL B XF2C1 69237592
1 NIB FLOWSERVE 1802AJCTYP1A112 MECHANICAL SEAL B XF2C1 69237592
$25.50
quality
LOT OF 4 PPS INC 102703 MECHANICAL SHAFT SEAL 625 NEW
LOT OF 4 PPS INC 102703 MECHANICAL SHAFT SEAL 625 NEW
$38.00
quality
Chesterton Mechanical Seal Kit 155 155A 662529
Chesterton Mechanical Seal Kit 155 155A 662529
$59.00
quality
NEW G L INLINE 1 X 1 PUMP MODEL SSV 1SVD1F2E0 IN 316SS WITH MECHANICAL SEAL
NEW G L INLINE 1 X 1 PUMP MODEL SSV 1SVD1F2E0 IN 316SS WITH MECHANICAL SEAL
$950.00
quality
1 NEW ZOLTEK 478 95112 BELLOWS MECHANICAL SEAL NIB
1 NEW ZOLTEK 478 95112 BELLOWS MECHANICAL SEAL NIB
$89.99
quality
1 NEW ZOLTEK 795513 BELLOWS MECHANICAL SEAL NIB
1 NEW ZOLTEK 795513 BELLOWS MECHANICAL SEAL NIB
$79.99
quality
NEW B48171 PS 4263 MECHANICAL PUMP SEAL KIT NEW IN BOX
NEW B48171 PS 4263 MECHANICAL PUMP SEAL KIT NEW IN BOX
$98.00
quality
DURAMETALLIC DURA SEAL Mechanical Seal Model  M219446 NEW
DURAMETALLIC DURA SEAL Mechanical Seal Model M219446 NEW
$237.50
quality
DURAMETALLIC DURA SEAL Mechanical Seal Model  M239061 NEW
DURAMETALLIC DURA SEAL Mechanical Seal Model M239061 NEW
$237.50
quality
SEPCO KCA0060BSS AJAA 01 MECHANICAL SEAL REPAIR KIT SIZE 3 3 4 TYPE BSS NEW
SEPCO KCA0060BSS AJAA 01 MECHANICAL SEAL REPAIR KIT SIZE 3 3 4 TYPE BSS NEW
$50.00
quality
SEPCO KCA0040BSS AJAB 01 MECHANICAL SEAL REPAIR KIT SIZE 2 1 2 316SS NEW
SEPCO KCA0040BSS AJAB 01 MECHANICAL SEAL REPAIR KIT SIZE 2 1 2 316SS NEW
$50.00
quality
SEPCO UCA0054BSS AJAB 01 MECHANICAL SEAL SIZE 3 3 8 TYPE BSS 316SS NEW
SEPCO UCA0054BSS AJAB 01 MECHANICAL SEAL SIZE 3 3 8 TYPE BSS 316SS NEW
$50.00
quality
SEPCO COMPLETE MECHANICAL SEAL 2 1 2 TYPE BSS NEW
SEPCO COMPLETE MECHANICAL SEAL 2 1 2 TYPE BSS NEW
$50.00
quality
SEPCO KCA0076BSS AJAA 01 MECHANICAL SEAL REPAIR KIT SIZE 4 3 4 TYPE BSSNEW
SEPCO KCA0076BSS AJAA 01 MECHANICAL SEAL REPAIR KIT SIZE 4 3 4 TYPE BSSNEW
$50.00
quality
SEPCO KCA0040BSS AJAB 01 MECHANICAL SEAL REPAIR KIT TYPE BSS SIZE 2 1 2 NEW
SEPCO KCA0040BSS AJAB 01 MECHANICAL SEAL REPAIR KIT TYPE BSS SIZE 2 1 2 NEW
$50.00
quality
NEW BELL  GOSSETT 186574 REPLACEMENT MECHANICAL SEAL 2
NEW BELL GOSSETT 186574 REPLACEMENT MECHANICAL SEAL 2
$289.99
quality
FLOWSERVE 550 1360593 Mechanical Split Seal Dura Seal PSS Type 37FS 162774
FLOWSERVE 550 1360593 Mechanical Split Seal Dura Seal PSS Type 37FS 162774
$299.99
quality
NEW VIKING 2 477 02 999 PUMP MECHANICAL SEAL REPLACEMENT PART D395869
NEW VIKING 2 477 02 999 PUMP MECHANICAL SEAL REPLACEMENT PART D395869
$28.43
quality
Lot of 2 Dayton Mechanical Shaft Seal 1R308 Type 21 NEW
Lot of 2 Dayton Mechanical Shaft Seal 1R308 Type 21 NEW
$20.00
quality
ABS 16369 Mechanical Seal AX5 52 80 13
ABS 16369 Mechanical Seal AX5 52 80 13
$30.00
quality
INGERSOLL DRESSER MECHANICAL PUMP SEAL CCN60954862 3879AJCTYP1A112XF1 609545 26
INGERSOLL DRESSER MECHANICAL PUMP SEAL CCN60954862 3879AJCTYP1A112XF1 609545 26
$48.99
quality
Dura Seal mechanical seal gland GEB2234763A
Dura Seal mechanical seal gland GEB2234763A
$97.00
quality
BURGMANN MECHANICAL SEAL PART  1111096 OR MGS15 30 G1 E1 NEW  OLD STOCK
BURGMANN MECHANICAL SEAL PART 1111096 OR MGS15 30 G1 E1 NEW OLD STOCK
$150.00
quality
SAFEMATIC SBE 75 GREO MECHANICAL SAFEBELLOW STAINLESS PUMP SEAL PART B441640
SAFEMATIC SBE 75 GREO MECHANICAL SAFEBELLOW STAINLESS PUMP SEAL PART B441640
$262.13
quality
FLOWSERVE GEB3855051B 1 MECHANICAL PUMP 1 5 8IN DURA SEAL GLAND PART B248373
FLOWSERVE GEB3855051B 1 MECHANICAL PUMP 1 5 8IN DURA SEAL GLAND PART B248373
$89.68
quality
HILTI 1DIA MECHANICAL CONCRETE ANCHOR 286018 NEWSEALED LOT OF 5
HILTI 1DIA MECHANICAL CONCRETE ANCHOR 286018 NEWSEALED LOT OF 5
$59.99
quality
MECHANICAL PUMP SEAL ASSEMBLY KIT 1 1 2 SHAFT C3
MECHANICAL PUMP SEAL ASSEMBLY KIT 1 1 2 SHAFT C3
$40.00
quality
NIB JOHN CRANE 1 5 16 x 1 7 8 Engineered Sealing Ceramic Mechanical Seal NEW
NIB JOHN CRANE 1 5 16 x 1 7 8 Engineered Sealing Ceramic Mechanical Seal NEW
$59.99
quality
NIB JOHN CRANE 2 1 2 x 3 3 8 Engineered Sealing Ceramic Mechanical Seal NEW
NIB JOHN CRANE 2 1 2 x 3 3 8 Engineered Sealing Ceramic Mechanical Seal NEW
$59.99
quality
NIB JOHN CRANE D 2500 231 9100 Engineered Sealing Ceramic Mechanical Seal NEW
NIB JOHN CRANE D 2500 231 9100 Engineered Sealing Ceramic Mechanical Seal NEW
$59.99
quality
NIB JOHN CRANE D 2000 363 9100 Engineered Sealing Ceramic Mechanical Seal NEW
NIB JOHN CRANE D 2000 363 9100 Engineered Sealing Ceramic Mechanical Seal NEW
$59.99
quality
Mechanical seal kit GS 625 Gorman Rupp Unused
Mechanical seal kit GS 625 Gorman Rupp Unused
$75.00
quality
Mechanical Seal S 765 Gorman Rupp Unused
Mechanical Seal S 765 Gorman Rupp Unused
$75.00
quality
Mechanical seal kit 980040 Allis Chalmers CSO F8E1 pump Unused
Mechanical seal kit 980040 Allis Chalmers CSO F8E1 pump Unused
$450.00
quality
BORG WARNER 3 3 8 OD 2 1 2ID MECHANICAL SEAL A3R0233 0PL GW25005Y 4A NEW
BORG WARNER 3 3 8 OD 2 1 2ID MECHANICAL SEAL A3R0233 0PL GW25005Y 4A NEW
$55.99
quality
Anchor Rota Face Mechanical Seal 1 0160301 Box of 5
Anchor Rota Face Mechanical Seal 1 0160301 Box of 5
$55.00
quality
US SEAL PS 6894 MECHANICAL SEAL 1125 TUNGSTEN CARBIDE VITON
US SEAL PS 6894 MECHANICAL SEAL 1125 TUNGSTEN CARBIDE VITON
$289.88
quality
John Crane 50 3710 mechanical seal repair kit 812255 80N1RPR Sealol 5
John Crane 50 3710 mechanical seal repair kit 812255 80N1RPR Sealol 5
$97.00
quality
EGG SEALOL Mechanical Seal Model RSD 2951
EGG SEALOL Mechanical Seal Model RSD 2951
$69.99
quality
Nice Dayton Pump Impeller Mechanical Seal 2ZWP2 2ZWP1 5hp 1 2 HP CHEAP
Nice Dayton Pump Impeller Mechanical Seal 2ZWP2 2ZWP1 5hp 1 2 HP CHEAP
$80.00
quality
JOHN CRANE A9T 1000 298 A9T1000298 MECHANICAL SEAL
JOHN CRANE A9T 1000 298 A9T1000298 MECHANICAL SEAL
$42.88
quality
JOHN CRANE MECHANICAL 4 SHAFT SEAL P N B40378 NEW
JOHN CRANE MECHANICAL 4 SHAFT SEAL P N B40378 NEW
$100.03
quality
FLOWSERVE Mechanical Seal 142397 1875 Seal Size 1 7 8 Shaft
FLOWSERVE Mechanical Seal 142397 1875 Seal Size 1 7 8 Shaft
$269.95
quality
FLOWSERVE MECHANICAL SEAL 1802ATY210RM075 NEW 1802ATY210RM075
FLOWSERVE MECHANICAL SEAL 1802ATY210RM075 NEW 1802ATY210RM075
$125.00
quality
John Crane 4375 mechanical seal B79296 Type 8 1T T8DBL 35 B40 CFSP 75293
John Crane 4375 mechanical seal B79296 Type 8 1T T8DBL 35 B40 CFSP 75293
$330.00
quality
New Armstrong Mechanical Seal Kit 1250 2A SC CB Resin EPDM SUS316 975000 982
New Armstrong Mechanical Seal Kit 1250 2A SC CB Resin EPDM SUS316 975000 982
$99.00
quality
Sargent Welch 1397 Duo Seal Belt Drive Rotary Vane Mechanical Vacuum Pump Works
Sargent Welch 1397 Duo Seal Belt Drive Rotary Vane Mechanical Vacuum Pump Works
$1,722.50
quality
John Crane 2165 mechanical seal 55mm 701490 680ZPS SCC217 M055 680 M055A
John Crane 2165 mechanical seal 55mm 701490 680ZPS SCC217 M055 680 M055A
$125.00
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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