Mechanical Seal

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Robco Enviro1 Mechanical Cartridge Seal LVS 28876
Robco Enviro1 Mechanical Cartridge Seal LVS 28876
$516.77
quality
Robco R3S1024 P2SSR2 Mechanical Seal
Robco R3S1024 P2SSR2 Mechanical Seal
$108.95
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Robco GRR3S1024 P2SSR2 Mechanical Seal
Robco GRR3S1024 P2SSR2 Mechanical Seal
$108.95
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Robco R6S2030 P2SHN4 Mechanical Seal
Robco R6S2030 P2SHN4 Mechanical Seal
$161.95
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Robco R3S1028 P2SSC2LC Mechanical Seal
Robco R3S1028 P2SSC2LC Mechanical Seal
$158.95
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Robco R3S1024 N2SSN2 Mechanical Seal 1 1 2
Robco R3S1024 N2SSN2 Mechanical Seal 1 1 2
$108.95
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Robco R3S1028 P2SSC2LC Mechanical Seal New No Box
Robco R3S1028 P2SSC2LC Mechanical Seal New No Box
$108.95
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Robco R3S1032 P2SSR2 Mechanical Seal
Robco R3S1032 P2SSR2 Mechanical Seal
$158.95
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Robco GRT6B3 B Mechanical Seal 1 1 2
Robco GRT6B3 B Mechanical Seal 1 1 2
$108.95
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NEW Gorman Rupp 25271 043 Mechanical Seal Kit FREE SHIPPING
NEW Gorman Rupp 25271 043 Mechanical Seal Kit FREE SHIPPING
$49.99
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Mechanical seal 2 1 8 inch 10505 30 Worthington unused
Mechanical seal 2 1 8 inch 10505 30 Worthington unused
$125.00
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Advanced Sealing Tech Mechanical Seals 15197 80339 NIB
Advanced Sealing Tech Mechanical Seals 15197 80339 NIB
$300.00
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Lot of 2 Eagle Burgmann Mechanical Seal 02 SHFV D1 94 E1 19 14571 NEW
Lot of 2 Eagle Burgmann Mechanical Seal 02 SHFV D1 94 E1 19 14571 NEW
$539.10
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NEW MECHANICAL SEAL ASSEMBLY  5S ES028
NEW MECHANICAL SEAL ASSEMBLY 5S ES028
$23.50
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NEW MECHANICAL SEAL ASSEMBLY  5S ES022
NEW MECHANICAL SEAL ASSEMBLY 5S ES022
$25.00
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2 Pcs 100mm OD x 57mm Mechanical Rubber O Ring Oil Resistant Seal Gaskets
2 Pcs 100mm OD x 57mm Mechanical Rubber O Ring Oil Resistant Seal Gaskets
$1.39
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John Crane Mechanical Seal TYPE 1DBL 1 3 4
John Crane Mechanical Seal TYPE 1DBL 1 3 4
$383.90
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John Crane Mechanical Seal 88SRS 2 3 8
John Crane Mechanical Seal 88SRS 2 3 8
$988.90
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John Crane Mechanical Seal Type 81T DBL 1 3 4
John Crane Mechanical Seal Type 81T DBL 1 3 4
$768.90
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John Crane Mechanical Seal Type 20R 1 3 4
John Crane Mechanical Seal Type 20R 1 3 4
$130.90
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John Crane Mechanical Seal Type 1 DBL 1 3 4
John Crane Mechanical Seal Type 1 DBL 1 3 4
$383.90
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John Crane Mechanical Seal Type 8 1 8 1 3 4 2000
John Crane Mechanical Seal Type 8 1 8 1 3 4 2000
$438.90
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John Crane Mechanical Seal Type 1 DBL 1 3 4
John Crane Mechanical Seal Type 1 DBL 1 3 4
$467.50
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John Crane Mechanical Seal RBA80951
John Crane Mechanical Seal RBA80951
$49.50
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John Crane Mechanical Seal Type 20R 2875
John Crane Mechanical Seal Type 20R 2875
$438.90
quality
John Crane Mechanical Seal Type 20R 1 3 4
John Crane Mechanical Seal Type 20R 1 3 4
$328.90
quality
John Crane Mechanical Seal Type 81T DBL 2 7 8
John Crane Mechanical Seal Type 81T DBL 2 7 8
$1,098.90
quality
John Crane Mechanical Seal TYPE 81T DBL 1 3 8
John Crane Mechanical Seal TYPE 81T DBL 1 3 8
$715.00
quality
John Crane Mechanical Seal 1 3 8 Type 8 1T DBL
John Crane Mechanical Seal 1 3 8 Type 8 1T DBL
$97.90
quality
John Crane Mechanical Seal TYPE 88SRS 2500
John Crane Mechanical Seal TYPE 88SRS 2500
$988.90
quality
John Crane Mechanical Seal Type 1 DBL 1 3 4
John Crane Mechanical Seal Type 1 DBL 1 3 4
$383.90
quality
John Crane Mechanical Seal Type 88SRS 2 1 8
John Crane Mechanical Seal Type 88SRS 2 1 8
$878.90
quality
John Crane Mechanical Seal TYPE 81T DBL 1 3 8
John Crane Mechanical Seal TYPE 81T DBL 1 3 8
$529.10
quality
John Crane Mechanical Seal 2437 DC 0035 D HC STD
John Crane Mechanical Seal 2437 DC 0035 D HC STD
$988.90
quality
John Crane Mechanical Seal Type 1 DBL 2 3 8
John Crane Mechanical Seal Type 1 DBL 2 3 8
$273.90
quality
John Crane Mechanical Seal Type T S8 1 T 8 1T DBL
John Crane Mechanical Seal Type T S8 1 T 8 1T DBL
$632.50
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John Crane Mechanical Seal Kit 6375 HSP 50738 1
John Crane Mechanical Seal Kit 6375 HSP 50738 1
$493.90
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John Crane Mechanical Seal Type Fan Seal DBL 4937
John Crane Mechanical Seal Type Fan Seal DBL 4937
$2,968.90
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John Crane Mechanical Seal Type 81T DBL 2 3 4
John Crane Mechanical Seal Type 81T DBL 2 3 4
$889.90
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John Crane Mechanical Seal Double Fan 2
John Crane Mechanical Seal Double Fan 2
$548.90
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John Crane Mechanical Seal Type 8B1 DBL 2
John Crane Mechanical Seal Type 8B1 DBL 2
$438.90
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John Crane Mechanical Seal TYPE 8 1DBL 1 1 8
John Crane Mechanical Seal TYPE 8 1DBL 1 1 8
$97.90
quality
John Crane Mechanical Seal Type 81T DBL 2 7 8
John Crane Mechanical Seal Type 81T DBL 2 7 8
$933.90
quality
John Crane Mechanical Seal 81T DBL 1 3 4
John Crane Mechanical Seal 81T DBL 1 3 4
$823.90
quality
John Crane Mechanical Seal TYPE 1 DBL 1 3 8
John Crane Mechanical Seal TYPE 1 DBL 1 3 8
$214.50
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John Crane Mechanical Seal Type 20R 1 3 4
John Crane Mechanical Seal Type 20R 1 3 4
$328.90
quality
John Crane Mechanical Seal Type 81T DBL 1750
John Crane Mechanical Seal Type 81T DBL 1750
$823.90
quality
John Crane Mechanical Seal TYPE 1DBL 1 3 4
John Crane Mechanical Seal TYPE 1DBL 1 3 4
$467.50
quality
John Crane Mechanical Seal Type 20R 2 1 8
John Crane Mechanical Seal Type 20R 2 1 8
$438.90
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John Crane Mechanical Seal Kit 2 Double Fan HSP 48757
John Crane Mechanical Seal Kit 2 Double Fan HSP 48757
$328.90
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John Crane Mechanical Seal Type 20R 1 3 4
John Crane Mechanical Seal Type 20R 1 3 4
$438.90
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John Crane Mechanical Seal TYPE 81T DBL 1 3 8
John Crane Mechanical Seal TYPE 81T DBL 1 3 8
$438.90
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Flowserve Mechanical Seal 55 mm K15371
Flowserve Mechanical Seal 55 mm K15371
$548.90
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John Crane Mechanical Seal DC 0035 318 D HC 3187
John Crane Mechanical Seal DC 0035 318 D HC 3187
$1,483.90
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John Crane Mechanical Seal 605HAC TXX 055
John Crane Mechanical Seal 605HAC TXX 055
$933.90
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Robco Mechanical Seal Type 1 TC SC 1 3 8 Viton O Rings
Robco Mechanical Seal Type 1 TC SC 1 3 8 Viton O Rings
$216.70
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Mechanical Seal Type 1 TC SC Viton 2125
Mechanical Seal Type 1 TC SC Viton 2125
$192.50
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Latty Seal Mechanical Seal B 72 060
Latty Seal Mechanical Seal B 72 060
$275.00
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Latty Seal Mechanical Seal B 71 060
Latty Seal Mechanical Seal B 71 060
$275.00
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Flowserve Mechanical Seal Dura Seal SGL INS PTO 3125
Flowserve Mechanical Seal Dura Seal SGL INS PTO 3125
$377.30
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Robco Mechanical Seal Type 1 TC SC Viton 4
Robco Mechanical Seal Type 1 TC SC Viton 4
$495.00
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Flowserve Mechanical Dura Seal SGL INS PTO 3125
Flowserve Mechanical Dura Seal SGL INS PTO 3125
$377.30
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Robco Mechanical Seal 100mm TC SC SC C Viton
Robco Mechanical Seal 100mm TC SC SC C Viton
$715.00
quality
Robco Mechanical Seal Type 1 TC SC 1 3 4 Viton O Rings
Robco Mechanical Seal Type 1 TC SC 1 3 4 Viton O Rings
$236.50
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John Crane Mechanical Seal Type 8B1 V 6 1 2
John Crane Mechanical Seal Type 8B1 V 6 1 2
$550.00
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FLOWSERVE KU3R3750333 5 MECHANICAL SEAL NEW IN ORIGINAL PACKAGE
FLOWSERVE KU3R3750333 5 MECHANICAL SEAL NEW IN ORIGINAL PACKAGE
$135.00
quality
Garlock PK Colt Industries Mechanical Seal 15 16 70005 0010
Garlock PK Colt Industries Mechanical Seal 15 16 70005 0010
$45.00
quality
3 3 8 MECHANICAL SEAL K2303375Q33 3375P 3
3 3 8 MECHANICAL SEAL K2303375Q33 3375P 3
$309.99
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2 1 4 MECHANICAL SEAL EEKB2661071 2 71855 GEB3941622A 430994
2 1 4 MECHANICAL SEAL EEKB2661071 2 71855 GEB3941622A 430994
$309.99
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MECHANICAL SEAL 800876H 2005724 2535
MECHANICAL SEAL 800876H 2005724 2535
$309.99
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MECHANICAL SEAL 21171032 BBW 1750 QRMV 303438 50840
MECHANICAL SEAL 21171032 BBW 1750 QRMV 303438 50840
$309.99
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3 MECHANICAL SEAL 2006039 10771
3 MECHANICAL SEAL 2006039 10771
$309.99
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FLOWSERVE MECHANICAL SEAL LE3C3000333 2 KW 337634 7 10 NE3N3000333 2 NEW
FLOWSERVE MECHANICAL SEAL LE3C3000333 2 KW 337634 7 10 NE3N3000333 2 NEW
$309.99
quality
220 VOLT DE ICE MECHANICAL PUMP SEAL 17028 APPLICATION UNKNOWN
220 VOLT DE ICE MECHANICAL PUMP SEAL 17028 APPLICATION UNKNOWN
$14.99
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DURA SEAL MECHANICAL SEAL M61258 99 GEB2660312B 2 NEW
DURA SEAL MECHANICAL SEAL M61258 99 GEB2660312B 2 NEW
$309.99
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New Durametallic 2 Mechanical Seal 82950 Double Inside Bro REMANUFACTERED
New Durametallic 2 Mechanical Seal 82950 Double Inside Bro REMANUFACTERED
$107.40
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John Crane RTI219 317 Mechanical Seal Nib PP046JH C New In Box
John Crane RTI219 317 Mechanical Seal Nib PP046JH C New In Box
$39.95
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Garlock Mechanical seal 1 1 8 70398 0013
Garlock Mechanical seal 1 1 8 70398 0013
$50.00
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Garlock PK Mechanical seal 1 1 8 70068 0013
Garlock PK Mechanical seal 1 1 8 70068 0013
$40.00
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FACTORY SEALED Westinghouse AMTOP AMT Variable Depth Handle Mechanism B379
FACTORY SEALED Westinghouse AMTOP AMT Variable Depth Handle Mechanism B379
$39.99
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BURGMANN M74 D 50 00 DOUBLE MECHANICAL SEAL 50mm Q12Q12VGG1 007198275 359931
BURGMANN M74 D 50 00 DOUBLE MECHANICAL SEAL 50mm Q12Q12VGG1 007198275 359931
$345.88
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ARMSTRONG 975000 984 NEW TYPE 2A MECHANICAL SEAL KIT 975000984
ARMSTRONG 975000 984 NEW TYPE 2A MECHANICAL SEAL KIT 975000984
$175.00
quality
NEW EGG Sealol RSD 1590 Mechanical Seal Kit PU002026 FREE SHIPPING
NEW EGG Sealol RSD 1590 Mechanical Seal Kit PU002026 FREE SHIPPING
$29.99
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ROTARY SYSTEMS 10053 3101 234 MECHANICAL SEAL ROTATING UNION NEW
ROTARY SYSTEMS 10053 3101 234 MECHANICAL SEAL ROTATING UNION NEW
$494.95
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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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