Mechanical Seal

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A8 1 New Delta AV30001125A Mechanical seal
A8 1 New Delta AV30001125A Mechanical seal
$122.00
quality
NEW ENVIROTECH 0660472JC ROTO JET MECHANICAL PUMP SEAL 2 1 2IN D521199
NEW ENVIROTECH 0660472JC ROTO JET MECHANICAL PUMP SEAL 2 1 2IN D521199
$87.13
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KSB Burgmann Mechanical Seal Set KB085M KB085M H 75 N BUKA22 12 4508
KSB Burgmann Mechanical Seal Set KB085M KB085M H 75 N BUKA22 12 4508
$150.00
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NIB BURGMANN MG1S 25 Z MECHANICAL SEAL
NIB BURGMANN MG1S 25 Z MECHANICAL SEAL
$195.99
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RX 567 NEW JOHN CRANE 609 MECHANICAL SEAL 1875 IN
RX 567 NEW JOHN CRANE 609 MECHANICAL SEAL 1875 IN
$199.00
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6 1 2 MECHANICAL FLANGE SEAL
6 1 2 MECHANICAL FLANGE SEAL
$49.99
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Goulds RPK3656M Mechanical Seal Kit
Goulds RPK3656M Mechanical Seal Kit
$50.00
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MECHANICAL SEAL TSP 20 30 NEW
MECHANICAL SEAL TSP 20 30 NEW
$29.99
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New John Crane Mechanical Wedge Seal Ring PTFE 2375 Type FLTG Free Shipping
New John Crane Mechanical Wedge Seal Ring PTFE 2375 Type FLTG Free Shipping
$38.99
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JOHN CRANE 8 1T DRW CFSP37128 MECHANICAL SEAL SIZE 1750 NEW IN BOX 99
JOHN CRANE 8 1T DRW CFSP37128 MECHANICAL SEAL SIZE 1750 NEW IN BOX 99
$89.10
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20mm Pump Rubber Bellow Shaft Mechanical Seal For Waterpumps Gas Pumps
20mm Pump Rubber Bellow Shaft Mechanical Seal For Waterpumps Gas Pumps
$3.99
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NEW DURA SEAL LE3F1375DZ3 1 M12377 99 MECHANICAL SEAL
NEW DURA SEAL LE3F1375DZ3 1 M12377 99 MECHANICAL SEAL
$199.99
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Price Pump 8302 211 Mechanical seal NEW
Price Pump 8302 211 Mechanical seal NEW
$99.00
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NEW IN BOX JOHN CRANE MECHANICAL SPRING SEAL 2Q00 RSD1122V 1 00008 0115 0
NEW IN BOX JOHN CRANE MECHANICAL SPRING SEAL 2Q00 RSD1122V 1 00008 0115 0
$25.99
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John Crane B66429 Mechanical Seal Assembly 0750 New
John Crane B66429 Mechanical Seal Assembly 0750 New
$18.95
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Durametallic 139715 Mechanical Seal 2125 Outside RA Seal NOS
Durametallic 139715 Mechanical Seal 2125 Outside RA Seal NOS
$69.95
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Durametallic Mechanical Seal GEA1463511A 4OD 1 7 16ID NOS
Durametallic Mechanical Seal GEA1463511A 4OD 1 7 16ID NOS
$49.95
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Durametallic 125722 Mechanical Seal 1 7 8 ID NOS
Durametallic 125722 Mechanical Seal 1 7 8 ID NOS
$49.95
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Durametallic 53730 Mechanical Seal 1 1 2 Outside RA NOS
Durametallic 53730 Mechanical Seal 1 1 2 Outside RA NOS
$49.95
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NEW Jabsco Pump Mechanical Seal Kit 96080 0280 OEM Part
NEW Jabsco Pump Mechanical Seal Kit 96080 0280 OEM Part
$55.00
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Durametallic 98806 Mechanical Seal 1 3 8 Inside RO NOS
Durametallic 98806 Mechanical Seal 1 3 8 Inside RO NOS
$49.95
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Durametallic 53730 Mechanical Seal 1 1 2 Outside RA C NOS
Durametallic 53730 Mechanical Seal 1 1 2 Outside RA C NOS
$49.95
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Durametallic 81967 Mechanical Seal 1 1 8 Inside RO NOS
Durametallic 81967 Mechanical Seal 1 1 8 Inside RO NOS
$39.95
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NEW JOHN CRANE TYPE 9DBL PTFE MECHANICAL WEDGE SEAL 2000 B521 73
NEW JOHN CRANE TYPE 9DBL PTFE MECHANICAL WEDGE SEAL 2000 B521 73
$499.99
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NEW MECHANICAL PUMP SHAFT SEAL KIT 1 1 4 ID
NEW MECHANICAL PUMP SHAFT SEAL KIT 1 1 4 ID
$45.00
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Ampco Pumps Co Replacement Kit GS8105960 125 Mechanical Seal
Ampco Pumps Co Replacement Kit GS8105960 125 Mechanical Seal
$150.16
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John Crane HOU 2888 APLC Mechanical Seal Seat
John Crane HOU 2888 APLC Mechanical Seal Seat
$36.00
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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
$239.25
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Zenith Mechanical Pump Seal part 18 79003 0056 1 187900300561
Zenith Mechanical Pump Seal part 18 79003 0056 1 187900300561
$90.00
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DEKKER VACUUM PUMP Mechanical Seal Part 6220 0055 000
DEKKER VACUUM PUMP Mechanical Seal Part 6220 0055 000
$101.25
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Mechanical Seal 95825 119 330502
Mechanical Seal 95825 119 330502
$49.99
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Dayton 4KHL6 Gear Pump Mechanical Seal Viton
Dayton 4KHL6 Gear Pump Mechanical Seal Viton
$137.71
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EGG Sealol RSD 2623 Mechanical Rotary Seal Assembly
EGG Sealol RSD 2623 Mechanical Rotary Seal Assembly
$39.99
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JOHN CRANE 0530 5620 Y02759 Mechanical Seal 53mm accessories
JOHN CRANE 0530 5620 Y02759 Mechanical Seal 53mm accessories
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John Crane Mechanical Cartridge Seal Size A27345
John Crane Mechanical Cartridge Seal Size A27345
$284.95
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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
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Robco R3S1020 P2SSN2 Mechanical Seal 1 1 4
Robco R3S1020 P2SSN2 Mechanical Seal 1 1 4
$108.95
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NEW JOHN CRANE 707218  500073 MECHANICAL SEAL 7 8
NEW JOHN CRANE 707218 500073 MECHANICAL SEAL 7 8
$75.00
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ZMT 648 150 40Q FACE MECHANICAL SEAL NEW
ZMT 648 150 40Q FACE MECHANICAL SEAL NEW
$25.00
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SEAL MECHANICAL PUMP ALLIS CHALMERS 52118510801
SEAL MECHANICAL PUMP ALLIS CHALMERS 52118510801
$114.99
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JOHN CRANE M196 82 Rotary Mechanical Seal Type 9 Size 1750
JOHN CRANE M196 82 Rotary Mechanical Seal Type 9 Size 1750
$199.95
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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
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Sepco ML2236FDA Mechanical Seal Joint Sealant Size 5 8
Sepco ML2236FDA Mechanical Seal Joint Sealant Size 5 8
$70.00
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1 1 4 O Ring Groove Tungsten Carbide Seat Mechanical Seal TORS 1250 1875 NEW
1 1 4 O Ring Groove Tungsten Carbide Seat Mechanical Seal TORS 1250 1875 NEW
$59.99
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FLOWSERVE 4R6998SL Silicon Carbide Rotating Face Mechanical Seal
FLOWSERVE 4R6998SL Silicon Carbide Rotating Face Mechanical Seal
$399.95
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FLOWSERVE B M375609 BELLOWS MECHANICAL SEAL KIT 89060
FLOWSERVE B M375609 BELLOWS MECHANICAL SEAL KIT 89060
$1,516.00
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Armstrong Pumps 975000 982 Mechanical Seal Kit 2A
Armstrong Pumps 975000 982 Mechanical Seal Kit 2A
$129.99
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Mechanical Seal Spring Seal 14032698
Mechanical Seal Spring Seal 14032698
$27.50
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1375 Shaft Mechanical Seal Flowserve CSCEX1375ECXES
1375 Shaft Mechanical Seal Flowserve CSCEX1375ECXES
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200 Shaft Mechanical Seal Flowserve 329857
200 Shaft Mechanical Seal Flowserve 329857
$142.40
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Skidmore 0625 Mechanical Pump Seal Kit Type S 54052 NEW
Skidmore 0625 Mechanical Pump Seal Kit Type S 54052 NEW
$17.50
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Flowserve AU3J1500LDK Mechanical Seal P803600
Flowserve AU3J1500LDK Mechanical Seal P803600
$40.77
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Gorman Rupp 51272 Model 02E3B Mechanical Seal For Pump
Gorman Rupp 51272 Model 02E3B Mechanical Seal For Pump
$19.75
quality
BANJO 16713 MECHANICAL SEAL
BANJO 16713 MECHANICAL SEAL
$275.00
quality
Flowserve EEKBS124171 Mechanical Seal Bore 475 NEW
Flowserve EEKBS124171 Mechanical Seal Bore 475 NEW
$329.99
quality
John Crane Mechanical Seal Repair Kit TYPE 88 for an A886 375 item 101476985
John Crane Mechanical Seal Repair Kit TYPE 88 for an A886 375 item 101476985
$99.00
quality
Seepex 330 Mechanical Seal Pin USED
Seepex 330 Mechanical Seal Pin USED
$9.99
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
DAYTON PPR8ZN006G Mechanical Seal Seat Assembly
DAYTON PPR8ZN006G Mechanical Seal Seat Assembly
$29.95
quality
DMSF DOUBLE MECHANICAL SEAL 2375 19
DMSF DOUBLE MECHANICAL SEAL 2375 19
$320.99
quality
1 1 4 Scenic 388 1250 05 LD 388 Mechanical Cartridge Seal lot3
1 1 4 Scenic 388 1250 05 LD 388 Mechanical Cartridge Seal lot3
$156.00
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
Honda Trash Pump IZ501010 Mechanical Shaft Seal O Ring Measures 138 OD
Honda Trash Pump IZ501010 Mechanical Shaft Seal O Ring Measures 138 OD
$14.99
quality
JOHN CRANE 5600 SERIES MECHANICAL SEAL 2500 INCH SINGLE CARTRIDGE NEW
JOHN CRANE 5600 SERIES MECHANICAL SEAL 2500 INCH SINGLE CARTRIDGE NEW
$99.00
quality
mechanical shaft seal MG1 16 G6 for sartorius BBraum Fermenter
mechanical shaft seal MG1 16 G6 for sartorius BBraum Fermenter
$300.00
quality
15 Type 1 Mechanical Seal NEW Surplus
15 Type 1 Mechanical Seal NEW Surplus
$65.00
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FLINT  WALLING 131100 Mechanical SealBuna NDia 5 8 In
FLINT WALLING 131100 Mechanical SealBuna NDia 5 8 In
$11.50
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Gorman Rupp Co 25271 207 Mechanical Seal
Gorman Rupp Co 25271 207 Mechanical Seal
$59.50
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NEW Flowserve Mechanical Single Seal Kit 1 7 8 Dia Shaft 316 Stainless SS Pump
NEW Flowserve Mechanical Single Seal Kit 1 7 8 Dia Shaft 316 Stainless SS Pump
$99.99
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CARBON MECHANICAL PUMP DRY SEAL SCRAP INSERTS BUSHING SEATS FLARING 179
CARBON MECHANICAL PUMP DRY SEAL SCRAP INSERTS BUSHING SEATS FLARING 179
$161.10
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DURAMETALLIC FLOWSERVE DURA SEAL 2500 PSS MECHANICAL SPLIT SEAL NEW G154
DURAMETALLIC FLOWSERVE DURA SEAL 2500 PSS MECHANICAL SPLIT SEAL NEW G154
$159.99
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ROPER GEAR PUMP STAINLESS X5SS1PTYDJHLW ROC WITH MECHANICAL SEAL P22 C48 NEW
ROPER GEAR PUMP STAINLESS X5SS1PTYDJHLW ROC WITH MECHANICAL SEAL P22 C48 NEW
$1,285.00
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KSB Single Mechanical Seal for MTC 50 Part  43301 Item No 01026111
KSB Single Mechanical Seal for MTC 50 Part 43301 Item No 01026111
$650.00
quality
S122313 Flowserve Mixerpac 495 Mechanical Seal Drive Shaft Chamber 57MM
S122313 Flowserve Mixerpac 495 Mechanical Seal Drive Shaft Chamber 57MM
$350.00
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Crane Packing 21 Mechanical Seal
Crane Packing 21 Mechanical Seal
$65.50
quality
Burgmann Mechanical Seal MS32 65
Burgmann Mechanical Seal MS32 65
$25.00
quality
John Crane T 1 Mechanical Seal MS01282 NEW Surplus
John Crane T 1 Mechanical Seal MS01282 NEW Surplus
$50.00
quality
John Crane 2375 Mechanical Seal 19337 E NEW Surplus
John Crane 2375 Mechanical Seal 19337 E NEW Surplus
$300.00
quality
Durametallic 075 Mechanical Seal 19805 NEW Surplus
Durametallic 075 Mechanical Seal 19805 NEW Surplus
$150.00
quality
Summit 125 Type 1 Mechanical Seal MS01279 NEW Surplus
Summit 125 Type 1 Mechanical Seal MS01279 NEW Surplus
$65.00
quality
Durametallic 075 Mechanical Seal 60809 NEW Surplus
Durametallic 075 Mechanical Seal 60809 NEW Surplus
$100.00
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John Crane 175 Type 1 Mechanical Seal XP661D1 NEW Surplus
John Crane 175 Type 1 Mechanical Seal XP661D1 NEW Surplus
$80.00
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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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