Mechanical Seal

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DURAMETALLIC DURA SEAL MECHANICAL SEAL PART EXN 2500 1 4 DMC X3R 2500
DURAMETALLIC DURA SEAL MECHANICAL SEAL PART EXN 2500 1 4 DMC X3R 2500
$152.10
quality
Bell  Gossett DP0304 5 8 TYPE 6 MECHANICAL SEAL NEW
Bell Gossett DP0304 5 8 TYPE 6 MECHANICAL SEAL NEW
$89.88
quality
BURGMANN CARTEX DE 50 E2 MECHANICAL SEAL 5z
BURGMANN CARTEX DE 50 E2 MECHANICAL SEAL 5z
$59.99
quality
BURGMANN CARTEX DE1 62 E1 MECHANICAL SEAL 5z
BURGMANN CARTEX DE1 62 E1 MECHANICAL SEAL 5z
$39.99
quality
FLOWSERVE LE3D1375C33 1 MECHANICAL SEAL NEW NO BOX
FLOWSERVE LE3D1375C33 1 MECHANICAL SEAL NEW NO BOX
$200.00
quality
NOS Armstrong Pump Mechanical Seal Kit 125 810150 128 EPDM SST Tungsten 249ETC
NOS Armstrong Pump Mechanical Seal Kit 125 810150 128 EPDM SST Tungsten 249ETC
$750.00
quality
NEW IN BOX JOHN CRANE 0180 N 411B 2 MECHANICAL SEAL KIT FAST SHIPPING B313
NEW IN BOX JOHN CRANE 0180 N 411B 2 MECHANICAL SEAL KIT FAST SHIPPING B313
$119.99
quality
DURAMETALLIC MECHANICAL SEAL DMC 5Y 2500 BAB NEW
DURAMETALLIC MECHANICAL SEAL DMC 5Y 2500 BAB NEW
$62.10
quality
Gorman Rupp Part No 25284 951 Mechanical Seal
Gorman Rupp Part No 25284 951 Mechanical Seal
$199.99
quality
Superior Flowserve 15 16 Mechanical Seal Rebuilt
Superior Flowserve 15 16 Mechanical Seal Rebuilt
$49.95
quality
VERTIFLO PUMP CO SJ 2126 S1 00 MECHANICAL SEAL KIT DIAMETER 1625 NEW
VERTIFLO PUMP CO SJ 2126 S1 00 MECHANICAL SEAL KIT DIAMETER 1625 NEW
$22.00
quality
VERTIFLO PUMP CO SJ 2126 C1 00 MECHANICAL SEAL KIT DIAMETER 1625 NEW
VERTIFLO PUMP CO SJ 2126 C1 00 MECHANICAL SEAL KIT DIAMETER 1625 NEW
$22.00
quality
BW IP INTERNATIONAL INC 85 14SA MECHANICAL SEAL NSFB
BW IP INTERNATIONAL INC 85 14SA MECHANICAL SEAL NSFB
$399.95
quality
Mechanical Seal Spring Seal 14032698
Mechanical Seal Spring Seal 14032698
$27.50
quality
MECHANICAL SEAL 4GT157CX1 816 NEW
MECHANICAL SEAL 4GT157CX1 816 NEW
$309.99
quality
ADMIX 648 150 40Q FACE MECHANICAL SEAL KIT NEW
ADMIX 648 150 40Q FACE MECHANICAL SEAL KIT NEW
$30.00
quality
Sulzer K105 7 Mechanical Seal Kit K1057
Sulzer K105 7 Mechanical Seal Kit K1057
$342.77
quality
ONE NEW PEERLESS MECHANICAL SPRING SEAL 2687626 0
ONE NEW PEERLESS MECHANICAL SPRING SEAL 2687626 0
$28.00
quality
New John Crane Mechanical Seal Set 3 5 8 T 8AB X P36J 1 042 1
New John Crane Mechanical Seal Set 3 5 8 T 8AB X P36J 1 042 1
$249.99
quality
NEW SPECO UAA0028SRC AIAA 00 MECHANICAL SEAL UAA0028SRCAIAA00
NEW SPECO UAA0028SRC AIAA 00 MECHANICAL SEAL UAA0028SRCAIAA00
$300.00
quality
TSP T 1 MECHANICAL SEAL 69 64 0080
TSP T 1 MECHANICAL SEAL 69 64 0080
$19.99
quality
New Flowserve Mechanical Seal Kit PP CFSP 52802
New Flowserve Mechanical Seal Kit PP CFSP 52802
$74.63
quality
NEW Gorman Rupp Self Lubricating Mechanical Seal Centrifugal Pump FREE SHIP
NEW Gorman Rupp Self Lubricating Mechanical Seal Centrifugal Pump FREE SHIP
$69.99
quality
New Durametallic 2 1 2 Mechanical Seal 120944 Dura Seal Double MRA AEPB2750WL3
New Durametallic 2 1 2 Mechanical Seal 120944 Dura Seal Double MRA AEPB2750WL3
$389.25
quality
PAC SEAL 877U SS Mechanical SHAFT SEAL KIT Spring
PAC SEAL 877U SS Mechanical SHAFT SEAL KIT Spring
$14.00
quality
NEW Brown  Sharp 713 9220 270 Mechanical Seal FREE SHIPPING
NEW Brown Sharp 713 9220 270 Mechanical Seal FREE SHIPPING
$28.99
quality
NSO FA104281 Mechanical Seal  NEW NIB
NSO FA104281 Mechanical Seal NEW NIB
$14.99
quality
HOSHIZAKI 418584 01 Mechanical Seal Retainer 1
HOSHIZAKI 418584 01 Mechanical Seal Retainer 1
$13.51
quality
LOT OF 2 NEW IN BOX INGERSOLL RAND FLOWSERVE MECHANICAL SEAL 60724614
LOT OF 2 NEW IN BOX INGERSOLL RAND FLOWSERVE MECHANICAL SEAL 60724614
$111.75
quality
FLOTEC M13914 Mechanical Seal G0646180
FLOTEC M13914 Mechanical Seal G0646180
$25.23
quality
John Crane C4830000099048 Mechanical Seal Primary Ring 3 NEW
John Crane C4830000099048 Mechanical Seal Primary Ring 3 NEW
$19.95
quality
Anchor Packing M13RA0220006 Rota Face Mechanical Seal 13SA RK 1 3 8 NOS
Anchor Packing M13RA0220006 Rota Face Mechanical Seal 13SA RK 1 3 8 NOS
$39.95
quality
CHESTERTON 442 Split Mechanical Seal 691595 Size 22 Shaft 2750
CHESTERTON 442 Split Mechanical Seal 691595 Size 22 Shaft 2750
$1,157.00
quality
ITT BELL  GUSSET 186499 MECHANICAL SEAL KIT LESS CERAMIC RING A614
ITT BELL GUSSET 186499 MECHANICAL SEAL KIT LESS CERAMIC RING A614
$14.92
quality
Dayton Mechanical Seal PP211030112G
Dayton Mechanical Seal PP211030112G
$48.13
quality
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
Mechanical seal Shaft seal 10 081 01 Gits Unused
Mechanical seal Shaft seal 10 081 01 Gits Unused
$75.00
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
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
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
NIB JOHN CRANE 70 15 032 MECHANICAL SEAL KIT FAST SHIPPING F178
NIB JOHN CRANE 70 15 032 MECHANICAL SEAL KIT FAST SHIPPING F178
$32.49
quality
GENUINE GORMAN RUPP PARTS MECHANICAL SEAL ASSEMBLY
GENUINE GORMAN RUPP PARTS MECHANICAL SEAL ASSEMBLY
$8.99
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
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
VIKING PUMP 2 477 015 999 MECHANICAL SEAL KIT REPLACEMENT PARTS A661
VIKING PUMP 2 477 015 999 MECHANICAL SEAL KIT REPLACEMENT PARTS A661
$29.84
quality
Flowserve AU3J1500LDK Mechanical Seal P803600
Flowserve AU3J1500LDK Mechanical Seal P803600
$40.77
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
$7.95
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
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
DAYTON 5DXY9 MECHANICAL SEAL NSFB
DAYTON 5DXY9 MECHANICAL SEAL NSFB
$24.95
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
ARMSTRONG 975000 984 NEW TYPE 2A MECHANICAL SEAL KIT 975000984
ARMSTRONG 975000 984 NEW TYPE 2A MECHANICAL SEAL KIT 975000984
$175.00
quality
Crane Packing 21 Mechanical Seal
Crane Packing 21 Mechanical Seal
$65.50
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
John Crane Type 2 Mechanical Seal 20mm
John Crane Type 2 Mechanical Seal 20mm
$29.00
quality
NEW GENUINE OEM GORMAN RUPP 25271 821 1 MECHANICAL SEAL KIT
NEW GENUINE OEM GORMAN RUPP 25271 821 1 MECHANICAL SEAL KIT
$50.00
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
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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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