Mechanical Seal

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EAGLE BURGMANN CARTEX ASP 3250 MECHANICAL SEAL NEW
EAGLE BURGMANN CARTEX ASP 3250 MECHANICAL SEAL NEW
$1,450.00
quality
JOHN CRANE D 0750 744 9100 6LV D07507449100 MECHANICAL SEAL
JOHN CRANE D 0750 744 9100 6LV D07507449100 MECHANICAL SEAL
$19.88
quality
NIB JOHN CRANE 70 15 032 MECHANICAL SEAL KIT FAST SHIPPING F178
NIB JOHN CRANE 70 15 032 MECHANICAL SEAL KIT FAST SHIPPING F178
$22.74
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
Robco R3S1020 P2SSN2 Mechanical Seal 1 1 4
Robco R3S1020 P2SSN2 Mechanical Seal 1 1 4
$108.95
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
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
$90.95
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
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
BURGMANN CARTEX DE1 62 E1 MECHANICAL SEAL 5z
BURGMANN CARTEX DE1 62 E1 MECHANICAL SEAL 5z
$169.99
quality
MECHANICAL SEAL LE3D1625P33 5z
MECHANICAL SEAL LE3D1625P33 5z
$49.99
quality
BURGMANN CARTEX DE 50 E2 MECHANICAL SEAL 5z
BURGMANN CARTEX DE 50 E2 MECHANICAL SEAL 5z
$169.99
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
$1,199.99
quality
Scot Inc Mechanical Pump Seal 101000110 New
Scot Inc Mechanical Pump Seal 101000110 New
$20.00
quality
AESSEAL TYPE CSSN 1875 MECHANICAL SEAL 3AVSS15L01 RG131
AESSEAL TYPE CSSN 1875 MECHANICAL SEAL 3AVSS15L01 RG131
$398.00
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
PP6026G Mechanical Seal
PP6026G Mechanical Seal
$105.14
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
GMHB  CO MECHANICAL SEAL 13 DIAM NIB
GMHB CO MECHANICAL SEAL 13 DIAM NIB
$49.99
quality
Seepex 103 M12 A7 Mechanical Seal Casing New
Seepex 103 M12 A7 Mechanical Seal Casing New
$20.00
quality
HOSHIZAKI 43249201 Mechanical Seal G3777089
HOSHIZAKI 43249201 Mechanical Seal G3777089
$197.94
quality
FirstPower Group LLC 700032H Control Valve Seal Complete Mechanism Modification
FirstPower Group LLC 700032H Control Valve Seal Complete Mechanism Modification
$699.00
quality
GOULDS PUMPS 10K124 Mechanical Seal Viton
GOULDS PUMPS 10K124 Mechanical Seal Viton
$125.88
quality
JOHN CRANE MECHANICAL SEAL ASSEMBLY B21659 NEW IN BOX A310
JOHN CRANE MECHANICAL SEAL ASSEMBLY B21659 NEW IN BOX A310
$55.99
quality
NE SEAL MECHANICAL SEAL NES 6U SIZE 90MM NEW IN BOX
NE SEAL MECHANICAL SEAL NES 6U SIZE 90MM NEW IN BOX
$240.00
quality
PEERLESS PUMP MECHANICAL SEAL KIT BSE2 NEW IN BOX
PEERLESS PUMP MECHANICAL SEAL KIT BSE2 NEW IN BOX
$75.00
quality
Garlock PK Mechanical Seal 2 shaft code 70005 0027 LL3100
Garlock PK Mechanical Seal 2 shaft code 70005 0027 LL3100
$30.00
quality
WAUKESHA CHERRY BURREL 030 306 002 MECHANICAL INNER SEAL
WAUKESHA CHERRY BURREL 030 306 002 MECHANICAL INNER SEAL
$148.00
quality
Eagle Burgmann Q1Q1PGG Mechanical Seal MG1S1 635 G3 E1 928367
Eagle Burgmann Q1Q1PGG Mechanical Seal MG1S1 635 G3 E1 928367
$70.00
quality
FLEX A SEAL 1 1 8 STYLE RB1 MECHANICAL SEAL
FLEX A SEAL 1 1 8 STYLE RB1 MECHANICAL SEAL
$259.00
quality
GADDIS GGP 21 PS 1145 MECHANICAL SEAL ASSEMBLY 2 X 2875 X 15
GADDIS GGP 21 PS 1145 MECHANICAL SEAL ASSEMBLY 2 X 2875 X 15
$110.88
quality
GADDIS BRASS SLEEVE FOR 2 GGP 21 PS 1145 MECHANICAL SEAL ASSEMBLY 99 07 6 01
GADDIS BRASS SLEEVE FOR 2 GGP 21 PS 1145 MECHANICAL SEAL ASSEMBLY 99 07 6 01
$48.88
quality
Ingersoll Rand Mechanical Lip Seal 2796A100DIAA001 NITRILE  lot of 4
Ingersoll Rand Mechanical Lip Seal 2796A100DIAA001 NITRILE lot of 4
$49.95
quality
DAYTON 5UXJ6 Mechanical Seal Buna N
DAYTON 5UXJ6 Mechanical Seal Buna N
$16.44
quality
DAYTON 4KHL7 Gear Pump Mechanical Seal Viton
DAYTON 4KHL7 Gear Pump Mechanical Seal Viton
$324.00
quality
DAYTON 4KHL1 Gear Pump Mechanical Seal Buna
DAYTON 4KHL1 Gear Pump Mechanical Seal Buna
$55.89
quality
DAYTON 5NYE9 Mechanical Seal Buna
DAYTON 5NYE9 Mechanical Seal Buna
$15.77
quality
DAYTON 4KHL4 Gear Pump Mechanical Seal Viton PTFE
DAYTON 4KHL4 Gear Pump Mechanical Seal Viton PTFE
$96.03
quality
DAYTON 4KHL3 Gear Pump Mechanical Seal PTFE
DAYTON 4KHL3 Gear Pump Mechanical Seal PTFE
$60.22
quality
DAYTON 4KHK8 Gear Pump Mechanical Seal Buna Viton
DAYTON 4KHK8 Gear Pump Mechanical Seal Buna Viton
$65.57
quality
DAYTON 5NYF0 Mechanical Seal Viton
DAYTON 5NYF0 Mechanical Seal Viton
$53.04
quality
DAYTON 4KHL9 Gear Pump Mechanical Seal PTFE
DAYTON 4KHL9 Gear Pump Mechanical Seal PTFE
$346.71
quality
DAYTON 4KHK9 Gear Pump Mechanical Seal Buna Viton
DAYTON 4KHK9 Gear Pump Mechanical Seal Buna Viton
$88.45
quality
DAYTON 4KHL8 Gear Pump Mechanical Seal Viton Buna
DAYTON 4KHL8 Gear Pump Mechanical Seal Viton Buna
$315.90
quality
DAYTON 4KHL5 Gear Pump Mechanical Seal Viton PTFE
DAYTON 4KHL5 Gear Pump Mechanical Seal Viton PTFE
$68.41
quality
JABSCO 18753 0245 Seal Mechanical Carbon Nitrile
JABSCO 18753 0245 Seal Mechanical Carbon Nitrile
$92.32
quality
DAYTON 4KHL6 Gear Pump Mechanical Seal Viton
DAYTON 4KHL6 Gear Pump Mechanical Seal Viton
$132.80
quality
JABSCO 18753 0241 Seal Mechanical Carbon Nitrile
JABSCO 18753 0241 Seal Mechanical Carbon Nitrile
$64.89
quality
DAYTON 4KHL2 Gear Pump Mechanical Seal Buna
DAYTON 4KHL2 Gear Pump Mechanical Seal Buna
$92.74
quality
DAYTON AEYF0 Mechanical Seal Viton G4596195
DAYTON AEYF0 Mechanical Seal Viton G4596195
$39.04
quality
DAYTON AEYE9 Mechanical Seal Buna G4596201
DAYTON AEYE9 Mechanical Seal Buna G4596201
$13.77
quality
NEW DAYTON 1R310 MECHANICAL SHAFT SEAL TYPE 21
NEW DAYTON 1R310 MECHANICAL SHAFT SEAL TYPE 21
$15.00
quality
DAYTON PPO83N001G Mechanical Seal Seat Assembly
DAYTON PPO83N001G Mechanical Seal Seat Assembly
$39.38
quality
DAYTON 201100011 Mechanical Seal
DAYTON 201100011 Mechanical Seal
$49.14
quality
DAYTON PPO82N001G Mechanical Seal Seat Assembly
DAYTON PPO82N001G Mechanical Seal Seat Assembly
$36.11
quality
DAYTON PPO85N001G Mechanical Seal Seat Assembly
DAYTON PPO85N001G Mechanical Seal Seat Assembly
$65.49
quality
PP21103031901G Mechanical Seal
PP21103031901G Mechanical Seal
$40.87
quality
DAYTON PP5621018G Mechanical Seal G6298671
DAYTON PP5621018G Mechanical Seal G6298671
$27.69
quality
Genuine US Seal MFG PS 1000 Pool Pump Mechanical Seal
Genuine US Seal MFG PS 1000 Pool Pump Mechanical Seal
$8.95
quality
JOHN CRANE MECHANICAL SEAL B81242 TYPE 32 4375 NIB
JOHN CRANE MECHANICAL SEAL B81242 TYPE 32 4375 NIB
$1,851.65
quality
NEW Mechanical Seal for Peerless Pump 2693601
NEW Mechanical Seal for Peerless Pump 2693601
$150.00
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
Garlock PK Mechanical Seal 3 4 Shaft 70068 0007 NEW
Garlock PK Mechanical Seal 3 4 Shaft 70068 0007 NEW
$19.79
quality
FACTORY SEALED EAGLEBURGMANN CARTEX ASP 1 750 00 MECHANICAL SEAL 316SS B265
FACTORY SEALED EAGLEBURGMANN CARTEX ASP 1 750 00 MECHANICAL SEAL 316SS B265
$62.99
quality
AESSEAL AIC12V01 Internal Balanced Mechanical Seal and ANX12V01 Stationery
AESSEAL AIC12V01 Internal Balanced Mechanical Seal and ANX12V01 Stationery
$118.80
quality
NEW DURAMETALLIC 16530 SINGLE OUTSIDE RO TT DURA MECHANICAL SEAL KEPR1653333
NEW DURAMETALLIC 16530 SINGLE OUTSIDE RO TT DURA MECHANICAL SEAL KEPR1653333
$60.00
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
$100.00
quality
Five Star Series 84 Fluid Single Cartridge Mechanical Seal 1 1 8 Shaft Diameter
Five Star Series 84 Fluid Single Cartridge Mechanical Seal 1 1 8 Shaft Diameter
$119.99
quality
DAYTON PPO8ZN040G Mechanical Seal Seat Assembly
DAYTON PPO8ZN040G Mechanical Seal Seat Assembly
$50.42
quality
PP6026G Mechanical Seal
PP6026G Mechanical Seal
$105.14
quality
DAYTON PPO8ZN041G Mechanical Seal Seat Assembly
DAYTON PPO8ZN041G Mechanical Seal Seat Assembly
$54.33
quality
PPL3314G Buna N Mechanical Seal
PPL3314G Buna N Mechanical Seal
$46.68
quality
NEW GOULDS 10K64 MECHANICAL SEAL ASSEMBLY VITON
NEW GOULDS 10K64 MECHANICAL SEAL ASSEMBLY VITON
$224.99
quality
DAYTON PPR8ZN007G Mechanical Seal Seat Assembly
DAYTON PPR8ZN007G Mechanical Seal Seat Assembly
$36.11
quality
JOHN CRANE MECHANICAL SEAL ASSEMBLY B21659 NEW IN BOX H217
JOHN CRANE MECHANICAL SEAL ASSEMBLY B21659 NEW IN BOX H217
$55.99
quality
LUTZ MMS SS 0151 001 39 STAINLESS PUMPTUBE WITH MECHANICAL SEAL HIGH VOLUME
LUTZ MMS SS 0151 001 39 STAINLESS PUMPTUBE WITH MECHANICAL SEAL HIGH VOLUME
$545.95
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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