Mechanical Seal

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Chesterton Mechanical Seal Repair Kit 241 12 SPK TC CB S Size 12 NIB
Chesterton Mechanical Seal Repair Kit 241 12 SPK TC CB S Size 12 NIB
$175.00
quality
Genuine US Seal MFG PS 100 Pool Pump Mechanical Seal Anthony 04547
Genuine US Seal MFG PS 100 Pool Pump Mechanical Seal Anthony 04547
$8.95
quality
Mechanical shaft seal PK 0842 for Nash Engineering MHC 25 Unused
Mechanical shaft seal PK 0842 for Nash Engineering MHC 25 Unused
$70.00
quality
Mechanical Seal 125 Type P n 96748361
Mechanical Seal 125 Type P n 96748361
$15.00
quality
John Crane B964 09 Type 8B1T Mechanical Seal HSP 33918 Size 1875 Mat JF511O15H
John Crane B964 09 Type 8B1T Mechanical Seal HSP 33918 Size 1875 Mat JF511O15H
$299.00
quality
JOHN CRANE MSC 1132 1750 1 MECHANICAL SEAL NSFB
JOHN CRANE MSC 1132 1750 1 MECHANICAL SEAL NSFB
$69.95
quality
JOHN CRANE FSD 3020 1250 2 MECHANICAL SEAL NSFB
JOHN CRANE FSD 3020 1250 2 MECHANICAL SEAL NSFB
$69.95
quality
CHESTERTON 046813 MECHANICAL SEAL NSFB
CHESTERTON 046813 MECHANICAL SEAL NSFB
$101.95
quality
EAGLE BURGMANN CARTEX ASP 3250 MECHANICAL SEAL NEW
EAGLE BURGMANN CARTEX ASP 3250 MECHANICAL SEAL NEW
$1,450.00
quality
6 1 2 MECHANICAL FLANGE SEAL
6 1 2 MECHANICAL FLANGE SEAL
$49.99
quality
Blackmer Mechanical Seal Assembly  P N 334414 Fits a CRL2 Pump
Blackmer Mechanical Seal Assembly P N 334414 Fits a CRL2 Pump
$99.00
quality
MECHANICAL SEAL TSP 20 30 NEW
MECHANICAL SEAL TSP 20 30 NEW
$29.99
quality
NEW DURA SEAL LE3F1375DZ3 1 M12377 99 MECHANICAL SEAL
NEW DURA SEAL LE3F1375DZ3 1 M12377 99 MECHANICAL SEAL
$199.99
quality
John Crane B66429 Mechanical Seal Assembly 0750 New
John Crane B66429 Mechanical Seal Assembly 0750 New
$18.95
quality
NEW Jabsco Pump Mechanical Seal Kit 96080 0280 OEM Part
NEW Jabsco Pump Mechanical Seal Kit 96080 0280 OEM Part
$55.00
quality
JOHN CRANE D 0750 744 9100 6LV D07507449100 MECHANICAL SEAL
JOHN CRANE D 0750 744 9100 6LV D07507449100 MECHANICAL SEAL
$19.88
quality
John Crane HOU 2888 APLC Mechanical Seal Seat
John Crane HOU 2888 APLC Mechanical Seal Seat
$48.00
quality
MECHANICAL SEAL B209B SPRING IS 1 7 8 L X 2 1 8 DIA  RING 2 3 8 DIA
MECHANICAL SEAL B209B SPRING IS 1 7 8 L X 2 1 8 DIA RING 2 3 8 DIA
$25.00
quality
US Seal Mechanical Pump Seal PS 1677
US Seal Mechanical Pump Seal PS 1677
$319.00
quality
NIB JOHN CRANE 70 15 032 MECHANICAL SEAL KIT FAST SHIPPING F178
NIB JOHN CRANE 70 15 032 MECHANICAL SEAL KIT FAST SHIPPING F178
$21.12
quality
Mechanical Seal 95825 119 330502
Mechanical Seal 95825 119 330502
$49.99
quality
Hydro ergoseal Mechanical Seal Assembly Model 11449
Hydro ergoseal Mechanical Seal Assembly Model 11449
$24.99
quality
Hydro ergoseal Mechanical Seal Assembly Model 5S ES028
Hydro ergoseal Mechanical Seal Assembly Model 5S ES028
$24.99
quality
RX 567 NEW JOHN CRANE 609 MECHANICAL SEAL 1875 IN
RX 567 NEW JOHN CRANE 609 MECHANICAL SEAL 1875 IN
$199.00
quality
BW IP Type QB Mechanical Seal A2R39253 01 Size 4 Flowserve 99PEX265523 NIB
BW IP Type QB Mechanical Seal A2R39253 01 Size 4 Flowserve 99PEX265523 NIB
$675.00
quality
Robco R3S1020 P2SSN2 Mechanical Seal 1 1 4
Robco R3S1020 P2SSN2 Mechanical Seal 1 1 4
$108.95
quality
BURGMANN CARTEX DE 50 E2 MECHANICAL SEAL 5z
BURGMANN CARTEX DE 50 E2 MECHANICAL SEAL 5z
$109.99
quality
BURGMANN CARTEX DE1 62 E1 MECHANICAL SEAL 5z
BURGMANN CARTEX DE1 62 E1 MECHANICAL SEAL 5z
$89.99
quality
John Crane Mechanical Seal P N 811578 5 8 Bore Type 21 Special Mating Ring NIB
John Crane Mechanical Seal P N 811578 5 8 Bore Type 21 Special Mating Ring NIB
$50.00
quality
EAGLEBURGMANN MECHANICAL SEAL MG921S10 275
EAGLEBURGMANN MECHANICAL SEAL MG921S10 275
$79.99
quality
US SEAL PS 1064 PS1064 PUMP MECHANICAL SEAL 5 16 SHAFT
US SEAL PS 1064 PS1064 PUMP MECHANICAL SEAL 5 16 SHAFT
$19.88
quality
US SEAL PS 708 PS708 PUMP MECHANICAL SEAL
US SEAL PS 708 PS708 PUMP MECHANICAL SEAL
$19.88
quality
GARLOCK 70068 0027 2 SHAFT MECHANICAL SEAL NSFB
GARLOCK 70068 0027 2 SHAFT MECHANICAL SEAL NSFB
$28.95
quality
Flowserve AU3J1500LDK Mechanical Seal P803600
Flowserve AU3J1500LDK Mechanical Seal P803600
$40.77
quality
LOT CHESTERTON MECHANICAL SEAL INCLUDES 2 180 15 2280 15 FOR PARTS REBUILD
LOT CHESTERTON MECHANICAL SEAL INCLUDES 2 180 15 2280 15 FOR PARTS REBUILD
$99.95
quality
Gorman Rupp Mechanical Seal Part No 25271 888
Gorman Rupp Mechanical Seal Part No 25271 888
$69.99
quality
Gorman Rupp Part No 25284 981 Mechanical Seal
Gorman Rupp Part No 25284 981 Mechanical Seal
$399.99
quality
DAYTON PPR8ZN006G Mechanical Seal Seat Assembly
DAYTON PPR8ZN006G Mechanical Seal Seat Assembly
$29.95
quality
10 PCS 1080 External Diameter 175 Thick Mechanical Rubber Oring Seal
10 PCS 1080 External Diameter 175 Thick Mechanical Rubber Oring Seal
$5.49
quality
HECKER WERKE GMBH 4334 00197244 MECHANICAL SEAL 34MM NEW 194964
HECKER WERKE GMBH 4334 00197244 MECHANICAL SEAL 34MM NEW 194964
$22.00
quality
EGG SEALOL RSD5080 RSD 5080 MECHANICAL SEAL  NOS
EGG SEALOL RSD5080 RSD 5080 MECHANICAL SEAL NOS
$25.00
quality
JOHN CRANE OBI 114 000 MECHANICAL SEAL NEW IN BOX
JOHN CRANE OBI 114 000 MECHANICAL SEAL NEW IN BOX
$50.00
quality
JOHN CRANE INT 0350 K MECHANICAL SEAL NEW IN BOX
JOHN CRANE INT 0350 K MECHANICAL SEAL NEW IN BOX
$55.00
quality
JOHN CRANE M412LZ387 MECHANICAL SEAL KIT NEW IN BOX
JOHN CRANE M412LZ387 MECHANICAL SEAL KIT NEW IN BOX
$100.00
quality
DAYTON 5DXY9 MECHANICAL SEAL NSFB
DAYTON 5DXY9 MECHANICAL SEAL NSFB
$24.95
quality
Crane Packing 21 Mechanical Seal
Crane Packing 21 Mechanical Seal
$65.50
quality
John Crane Type 2 Mechanical Seal 20mm
John Crane Type 2 Mechanical Seal 20mm
$29.00
quality
MECO Mechanical Seal Repair Kit EAS 444SIKS RG NIB
MECO Mechanical Seal Repair Kit EAS 444SIKS RG NIB
$25.00
quality
JOHN CRANE 3 3 4 MECHANICAL PUMP SEAL ASSEMBLY 2F 8C NIB
JOHN CRANE 3 3 4 MECHANICAL PUMP SEAL ASSEMBLY 2F 8C NIB
$44.99
quality
DURA SEAL 8 MECHANICAL SEAL GEA1319513A
DURA SEAL 8 MECHANICAL SEAL GEA1319513A
$95.95
quality
DURAMETALLIC DURA SEAL MECHANICAL SEAL KU3R1750333 COMPLETE SEAL UNIT
DURAMETALLIC DURA SEAL MECHANICAL SEAL KU3R1750333 COMPLETE SEAL UNIT
$125.00
quality
Dayton Mechanical Shaft Seal Models 1R2981R3011R3041R3051R307
Dayton Mechanical Shaft Seal Models 1R2981R3011R3041R3051R307
$27.50
quality
5 MECHANICAL SPLIT DURA SEAL 3750 PSS
5 MECHANICAL SPLIT DURA SEAL 3750 PSS
$274.99
quality
FLOWSERVE SPLIT MECHANICAL SEAL MV738916615
FLOWSERVE SPLIT MECHANICAL SEAL MV738916615
$49.99
quality
Blackmer Mechanical Seal Assembly  P N 332050 040
Blackmer Mechanical Seal Assembly P N 332050 040
$119.00
quality
ZENITH PUMP 18 79003 0053 1 MECHANICAL SEAL ASSY 81T 187900300531
ZENITH PUMP 18 79003 0053 1 MECHANICAL SEAL ASSY 81T 187900300531
$174.00
quality
SEPCO 1 4 MECHANICAL SEAL JOINT ML4004 NIB
SEPCO 1 4 MECHANICAL SEAL JOINT ML4004 NIB
$69.99
quality
ZENITH PUMP 15 54020 0015 3 MECHANICAL SEAL HOUSING 155402000153
ZENITH PUMP 15 54020 0015 3 MECHANICAL SEAL HOUSING 155402000153
$109.00
quality
ZENITH PUMP 15 54020 0018 3 MECHANICAL SEAL HOUSING 155402000183
ZENITH PUMP 15 54020 0018 3 MECHANICAL SEAL HOUSING 155402000183
$289.00
quality
GORMAN RUPP T2 MECHANICAL SEAL REPAIR ASSY 1 7 8 NEW IN BOX
GORMAN RUPP T2 MECHANICAL SEAL REPAIR ASSY 1 7 8 NEW IN BOX
$65.00
quality
Mechanical pump Seal Assembly
Mechanical pump Seal Assembly
$229.00
quality
1 NEW GARLOCK PK70068 0007 MECHANICAL SEAL MAKE OFFER
1 NEW GARLOCK PK70068 0007 MECHANICAL SEAL MAKE OFFER
$23.87
quality
A C Compressor Corp 16 242 085 508 Mechanical Seal 2 5 8
A C Compressor Corp 16 242 085 508 Mechanical Seal 2 5 8
$999.00
quality
Flowserve A3R2976 12 Mechanical Seal for Booster Pump
Flowserve A3R2976 12 Mechanical Seal for Booster Pump
$1,920.00
quality
GEAR PUMP MECHANICAL SEAL VITON PTFE
GEAR PUMP MECHANICAL SEAL VITON PTFE
$60.00
quality
FLOWSERVE MECHANICAL PUMP SEAL 5616 REV 4 PZB
FLOWSERVE MECHANICAL PUMP SEAL 5616 REV 4 PZB
$52.49
quality
Worthington Mechanical Seal Type 1 BF0271 26457
Worthington Mechanical Seal Type 1 BF0271 26457
$35.00
quality
Worthington Mechanical Seal Type 1 BR271 26457
Worthington Mechanical Seal Type 1 BR271 26457
$35.00
quality
VILTER MECHANICAL SHAFT SEAL ASSEMBLY A33489A NEW IN BOX
VILTER MECHANICAL SHAFT SEAL ASSEMBLY A33489A NEW IN BOX
$165.45
quality
Flowserve Mechanical Seal M779099V Single Outside BRO Shaft 2000 B M 111950
Flowserve Mechanical Seal M779099V Single Outside BRO Shaft 2000 B M 111950
$200.00
quality
Durametallic Mechanical Seal V8353898 Single Outside VRA Tag 70001629 3937
Durametallic Mechanical Seal V8353898 Single Outside VRA Tag 70001629 3937
$350.00
quality
Durametallic Mechanical Seal V8353898 Single Outside MSS B M 311222 Shf 200
Durametallic Mechanical Seal V8353898 Single Outside MSS B M 311222 Shf 200
$750.00
quality
Durametallic Mechanical Seal V8353898 Single Outside MSS B M 311224 Shf 250
Durametallic Mechanical Seal V8353898 Single Outside MSS B M 311224 Shf 250
$850.00
quality
NEW EAGLE BURGMANN CARTEX IKA DN 20 E1 MECHANICAL SEAL ASSEMBLY 14404 BQ1V16MG
NEW EAGLE BURGMANN CARTEX IKA DN 20 E1 MECHANICAL SEAL ASSEMBLY 14404 BQ1V16MG
$1,019.99
quality
Durametallic Mechanical Seal V8175578 Double Inside VRA B M 306721 Shf 150mm
Durametallic Mechanical Seal V8175578 Double Inside VRA B M 306721 Shf 150mm
$1,500.00
quality
AESSEAL TYPE CSSN 1875 MECHANICAL SEAL 3AVSS15L01 RG131
AESSEAL TYPE CSSN 1875 MECHANICAL SEAL 3AVSS15L01 RG131
$398.00
quality
NIB ASI SD 3 1 5 16 MECHANICAL SEAL BODY 316 SS SD3
NIB ASI SD 3 1 5 16 MECHANICAL SEAL BODY 316 SS SD3
$45.95
quality
NEW IN BOX JOHN CRANE 3 1 2 TYPE 1 MECHANICAL SEAL B92888
NEW IN BOX JOHN CRANE 3 1 2 TYPE 1 MECHANICAL SEAL B92888
$680.00
quality
NIB INGERSOLL RAND CPM 250S429X2 MECHANICAL SEAL 2500 CPN 603113399
NIB INGERSOLL RAND CPM 250S429X2 MECHANICAL SEAL 2500 CPN 603113399
$275.00
quality
JOHN CRANE 5611 SINGLE CARTRIDGE MECHANICAL SEAL M116483 1375
JOHN CRANE 5611 SINGLE CARTRIDGE MECHANICAL SEAL M116483 1375
$498.00
quality
JOHN CRANE TYPE 21 MECHANICAL SEAL ASSEMBLY 1375 M108812
JOHN CRANE TYPE 21 MECHANICAL SEAL ASSEMBLY 1375 M108812
$148.00
quality
IWY 10x24x26 Mechanical Seal
IWY 10x24x26 Mechanical Seal
$46.77
quality
GMHB  CO MECHANICAL SEAL 13 DIAM NIB
GMHB CO MECHANICAL SEAL 13 DIAM NIB
$49.99
quality
JOHN CRANE I D 2250 228 9100 Mechanical Seal
JOHN CRANE I D 2250 228 9100 Mechanical Seal
$29.95
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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