Mechanical Seal

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New Roper Mechanical Seal QP171 G4 65 Type 9 1 1 16
New Roper Mechanical Seal QP171 G4 65 Type 9 1 1 16
$54.00
quality
GOULDS PUMP SP1 A C PUMP SINGLE MECHANICAL SEAL GPSS3250SSS NIB NEW
GOULDS PUMP SP1 A C PUMP SINGLE MECHANICAL SEAL GPSS3250SSS NIB NEW
$198.00
quality
NEW FLOWSERVE BX18755X4X REBUILD MECHANICAL SEAL 1 7 8IN ID D286978
NEW FLOWSERVE BX18755X4X REBUILD MECHANICAL SEAL 1 7 8IN ID D286978
$207.00
quality
John Crane 175 666891 mechanical seal B45367 F SP 16165 Type 1
John Crane 175 666891 mechanical seal B45367 F SP 16165 Type 1
$5.99
quality
Federal Mogul Mechanical Seals
Federal Mogul Mechanical Seals
$2.99
quality
NEW JOHN CRANE BF501C118 8 MECHANICAL SIZE 1250IN SEAL REPLACEMENT PART B235995
NEW JOHN CRANE BF501C118 8 MECHANICAL SIZE 1250IN SEAL REPLACEMENT PART B235995
$30.00
quality
CHESTERTON 682368 MECHANICAL SEAL 221 52 SSRA RSCEP FKM UNSPLIT 165MM BORE 29084
CHESTERTON 682368 MECHANICAL SEAL 221 52 SSRA RSCEP FKM UNSPLIT 165MM BORE 29084
$74.76
quality
NEW CHESTERTON 440E 21 RU CB S SHAFT 2625 MECHANICAL SEAL KIT D287329
NEW CHESTERTON 440E 21 RU CB S SHAFT 2625 MECHANICAL SEAL KIT D287329
$75.00
quality
DUNHAM BUSH TYPE 21 028F 171 E11 14 MECHANICAL PUMP 2IN SEAL KIT B306634
DUNHAM BUSH TYPE 21 028F 171 E11 14 MECHANICAL PUMP 2IN SEAL KIT B306634
$80.00
quality
NEW A37 5125 001 9237 MECHANICAL SEAL SPLIT MATING RING B287556
NEW A37 5125 001 9237 MECHANICAL SEAL SPLIT MATING RING B287556
$75.00
quality
JOHN CRANE 5611 SINGLE CARTRIDGE MECHANICAL SEAL M116483 1375
JOHN CRANE 5611 SINGLE CARTRIDGE MECHANICAL SEAL M116483 1375
$498.00
quality
US Seal Single Spring Mechanical Pump Seal PT  PS 366
US Seal Single Spring Mechanical Pump Seal PT PS 366
$45.95
quality
JOHN CRANE TYPE 21 MECHANICAL SEAL ASSEMBLY 1375 M108812
JOHN CRANE TYPE 21 MECHANICAL SEAL ASSEMBLY 1375 M108812
$148.00
quality
NEW CONVENIENCE FOOD SYSTEMS 45 72 8 15164218 45MM ID MECHANICAL SEAL D249241
NEW CONVENIENCE FOOD SYSTEMS 45 72 8 15164218 45MM ID MECHANICAL SEAL D249241
$20.00
quality
NEW FULTON 2 30 2221 1762480 MECHANICAL SEAL GLAND D354140
NEW FULTON 2 30 2221 1762480 MECHANICAL SEAL GLAND D354140
$100.00
quality
New Paco Genuine K105 1 Mechanical Seal Kit 91909832
New Paco Genuine K105 1 Mechanical Seal Kit 91909832
$179.99
quality
Syntron RP Mechanical Shaft Seal RP 24 Flush Connection 3 4 SS HYCAR Seals 149
Syntron RP Mechanical Shaft Seal RP 24 Flush Connection 3 4 SS HYCAR Seals 149
$149.00
quality
New Paco Genuine Mechanical Seal Kit 91909744
New Paco Genuine Mechanical Seal Kit 91909744
$79.99
quality
New ABS Scavenger E Series Pump Primary Mechanical Seal p n 11107951 94
New ABS Scavenger E Series Pump Primary Mechanical Seal p n 11107951 94
$75.75
quality
NEW EGG SEALOL PUMP MECHANICAL SEAL PART 043 GFT X28
NEW EGG SEALOL PUMP MECHANICAL SEAL PART 043 GFT X28
$19.67
quality
MECHANICAL SEAL KIT CARBON NEW
MECHANICAL SEAL KIT CARBON NEW
$199.00
quality
Durametallic Mechanical Seal Dura Seal Double MRA
Durametallic Mechanical Seal Dura Seal Double MRA
$50.00
quality
Delta mechanical seal AV30001125A model 3000 1125 size New
Delta mechanical seal AV30001125A model 3000 1125 size New
$125.00
quality
Delta mechanical seal AV30Y01250A model 3000 1250 size New
Delta mechanical seal AV30Y01250A model 3000 1250 size New
$125.00
quality
Wacker Trash Pump Mechanical Seal Fits New Style PT3A PT3V PT3H 0117819
Wacker Trash Pump Mechanical Seal Fits New Style PT3A PT3V PT3H 0117819
$42.95
quality
Pillar DNS Dai Nippon Screen Mechanical Shaft Seal 10625 OD 8 ID
Pillar DNS Dai Nippon Screen Mechanical Shaft Seal 10625 OD 8 ID
$46.99
quality
CHESTERTON 714  044809 Mechanical Seal Stationary 15
CHESTERTON 714 044809 Mechanical Seal Stationary 15
$19.99
quality
Multiquip 0803442930 Mechanical Seal QP3TH QP2TH
Multiquip 0803442930 Mechanical Seal QP3TH QP2TH
$115.40
quality
CentriPro High Temperature Mechanical Seal 10K18
CentriPro High Temperature Mechanical Seal 10K18
$25.00
quality
NEW SKIDMORE 57924 3 4 TYPE N MECHANICAL SEAL KIT FOR VHS PUMP 1 PER BUY
NEW SKIDMORE 57924 3 4 TYPE N MECHANICAL SEAL KIT FOR VHS PUMP 1 PER BUY
$50.00
quality
JOHN CRANE TYPE 680 JOINT MECHANICAL SEAL SIZE 1750IN 680GBT SSF315 28 88366
JOHN CRANE TYPE 680 JOINT MECHANICAL SEAL SIZE 1750IN 680GBT SSF315 28 88366
$499.99
quality
JOHN CRANE MC680 0621R 1750IN TYPE 680 680GBT SSF315 28 MECHANICAL SEAL 88375
JOHN CRANE MC680 0621R 1750IN TYPE 680 680GBT SSF315 28 MECHANICAL SEAL 88375
$249.99
quality
FLUID TEC MECHANICAL PUMP SEAL 3125 152100037R
FLUID TEC MECHANICAL PUMP SEAL 3125 152100037R
$79.99
quality
NOS L000 LL CL2 0044 Mechanical Seal Rev J D 1625 684
NOS L000 LL CL2 0044 Mechanical Seal Rev J D 1625 684
$650.00
quality
NEW FLOWSERVE 34815 MECHANICAL SEAL
NEW FLOWSERVE 34815 MECHANICAL SEAL
$53.99
quality
Alfa Laval Tri Clover DuraMetallic Mechanical Seal Kit
Alfa Laval Tri Clover DuraMetallic Mechanical Seal Kit
$75.00
quality
APV stainless rotary lobe pump w mechanical seals
APV stainless rotary lobe pump w mechanical seals
$600.00
quality
NEW JOHN CRANE MECHANICAL PUMP 1IN SEAL REPLACEMENT PART B249815
NEW JOHN CRANE MECHANICAL PUMP 1IN SEAL REPLACEMENT PART B249815
$30.00
quality
Filton Mechanical Seal Kit
Filton Mechanical Seal Kit
$2,500.00
quality
GOULDS PUMPS 10K124 Mechanical Seal Viton
GOULDS PUMPS 10K124 Mechanical Seal Viton
$125.88
quality
Parker 8 TPL S Seal Lok S Mechanical Sleeve box of 50
Parker 8 TPL S Seal Lok S Mechanical Sleeve box of 50
$8.49
quality
Mechanical seal seat adapter 4 to 3 3 4 inches 3 5 16 inch bore Unused
Mechanical seal seat adapter 4 to 3 3 4 inches 3 5 16 inch bore Unused
$200.00
quality
New Goulds Pumps 10K95 Mechanical Seal Assembly
New Goulds Pumps 10K95 Mechanical Seal Assembly
$15.00
quality
Crane Deming B34329 Mechanical Tungsten Carbide Seal Assembly
Crane Deming B34329 Mechanical Tungsten Carbide Seal Assembly
$781.25
quality
NO NAME 268716501 MECHANICAL SEAL NEW
NO NAME 268716501 MECHANICAL SEAL NEW
$12.00
quality
LOT 2 NEW EGG RSD 2587 MECHANICAL JOINT PUMP SHAFT SEAL SEALOL 200140
LOT 2 NEW EGG RSD 2587 MECHANICAL JOINT PUMP SHAFT SEAL SEALOL 200140
$35.00
quality
Gould 10K91 Mechanical Seal Assembly
Gould 10K91 Mechanical Seal Assembly
$161.77
quality
PAC SEAL MECHANICAL PUMP SEAL PS338V 2125 SHAFT SIZE NEW
PAC SEAL MECHANICAL PUMP SEAL PS338V 2125 SHAFT SIZE NEW
$175.00
quality
PAC SEAL MECHANICAL PUMP SEAL 11086 1 SHAFT SIZE NEW
PAC SEAL MECHANICAL PUMP SEAL 11086 1 SHAFT SIZE NEW
$75.00
quality
PACO Pump Mechanical Seal
PACO Pump Mechanical Seal
$40.00
quality
Pump Mechanical Seal  96690109 For 2000 Shaft
Pump Mechanical Seal 96690109 For 2000 Shaft
$40.00
quality
Burgmann Mechanical Seal 14032693 175 Shaft
Burgmann Mechanical Seal 14032693 175 Shaft
$40.00
quality
MECHANICAL PUMP SEAL 02 161BCFKF 0875 SHAFT SIZE NEW
MECHANICAL PUMP SEAL 02 161BCFKF 0875 SHAFT SIZE NEW
$25.00
quality
PAC SEAL MECHANICAL PUMP SEAL PS 752 075 SHAFT SIZE NEW
PAC SEAL MECHANICAL PUMP SEAL PS 752 075 SHAFT SIZE NEW
$25.00
quality
PAC SEAL MECHANICAL PUMP SEAL PS 547 1375 SHAFT SIZE NEW
PAC SEAL MECHANICAL PUMP SEAL PS 547 1375 SHAFT SIZE NEW
$60.00
quality
John Crane Mechanical Shaft Seal M49805 New
John Crane Mechanical Shaft Seal M49805 New
$25.00
quality
DAVIS EMU WILO 75MM  105MM MECHANICAL SEAL KIT
DAVIS EMU WILO 75MM 105MM MECHANICAL SEAL KIT
$2,995.00
quality
FLOWSERVE P02887 00 PUMP KIT MECHANICAL SEAL ROTOR NEW NIB
FLOWSERVE P02887 00 PUMP KIT MECHANICAL SEAL ROTOR NEW NIB
$49.99
quality
WAUKESHA CHERRY BURREL 030 306 002 MECHANICAL INNER SEAL
WAUKESHA CHERRY BURREL 030 306 002 MECHANICAL INNER SEAL
$148.00
quality
NEW HANDTMANN 820279 MECHANICAL SEAL INSIDE DIAMETER 3IN B224162
NEW HANDTMANN 820279 MECHANICAL SEAL INSIDE DIAMETER 3IN B224162
$30.00
quality
PAC SEAL MECHANICAL PUMP SEAL PS 426 125 SHAFT SIZE NEW
PAC SEAL MECHANICAL PUMP SEAL PS 426 125 SHAFT SIZE NEW
$75.00
quality
PAC SEAL MECHANICAL PUMP SEAL PS 356 1125 SHAFT SIZE NEW
PAC SEAL MECHANICAL PUMP SEAL PS 356 1125 SHAFT SIZE NEW
$35.00
quality
PAC SEAL MECHANICAL PUMP SEAL PS 356V 1125 SHAFT SIZE NEW
PAC SEAL MECHANICAL PUMP SEAL PS 356V 1125 SHAFT SIZE NEW
$50.00
quality
PAC SEAL MECHANICAL PUMP SEAL PS 100 0625 SHAFT SIZE NEW
PAC SEAL MECHANICAL PUMP SEAL PS 100 0625 SHAFT SIZE NEW
$7.00
quality
PAC SEAL MECHANICAL PUMP SEAL PS 101 075 SHAFT SIZE NEW
PAC SEAL MECHANICAL PUMP SEAL PS 101 075 SHAFT SIZE NEW
$7.00
quality
New Waukesha Mechanical Carbon Seal 300 114 002 John Crane 300114002
New Waukesha Mechanical Carbon Seal 300 114 002 John Crane 300114002
$429.95
quality
GOULDS 10K186 PUMP MECHANICAL SEAL ASSEMBLY 1 5 8IN BORE SILCAR VITON B205167
GOULDS 10K186 PUMP MECHANICAL SEAL ASSEMBLY 1 5 8IN BORE SILCAR VITON B205167
$1,465.00
quality
NEW JOHN CRANE 81669001 A15002K 40 MECHANICAL PUMP SEAL REPLACEMENT PART D356746
NEW JOHN CRANE 81669001 A15002K 40 MECHANICAL PUMP SEAL REPLACEMENT PART D356746
$125.00
quality
NSK Bearings Kit Seal Mechanical SQ1323 1 106231 PP046JBT
NSK Bearings Kit Seal Mechanical SQ1323 1 106231 PP046JBT
$249.00
quality
FLOWSERVE 2 MECHANICAL SEAL LE3C2375333 2 ON BODY NE 352375333 2 ON SEAL
FLOWSERVE 2 MECHANICAL SEAL LE3C2375333 2 ON BODY NE 352375333 2 ON SEAL
$349.95
quality
Mechanical Seal P 5005 New In Package
Mechanical Seal P 5005 New In Package
$51.00
quality
New Blackmer Mechanical Seal Part No 331430 G 10
New Blackmer Mechanical Seal Part No 331430 G 10
$49.99
quality
Ampco Pumps Co Replacement Kit GS8105960 125 Mechanical Seal
Ampco Pumps Co Replacement Kit GS8105960 125 Mechanical Seal
$149.99
quality
142362 New No Box Blackmer 335225 Mechanical Seal LGLD3
142362 New No Box Blackmer 335225 Mechanical Seal LGLD3
$127.47
quality
NEW EG  G Sealol Mechanical Rotary Seal  6000 WARRANTY
NEW EG G Sealol Mechanical Rotary Seal 6000 WARRANTY
$7.50
quality
NEW SULZER VH3SL0A0S2 MECHANICAL KIT SE2 58 QREG 302934 PUMP SEAL B338662
NEW SULZER VH3SL0A0S2 MECHANICAL KIT SE2 58 QREG 302934 PUMP SEAL B338662
$1,500.00
quality
NEW JOHN CRANE BF50878 MECHANICAL JOINT PUMP SHAFT SEAL 1 1 4IN 200139
NEW JOHN CRANE BF50878 MECHANICAL JOINT PUMP SHAFT SEAL 1 1 4IN 200139
$30.00
quality
NEW JOHN CRANE BF50878 MECHANICAL JOINT PUMP SHAFT SEAL 1 1 4IN 200138
NEW JOHN CRANE BF50878 MECHANICAL JOINT PUMP SHAFT SEAL 1 1 4IN 200138
$30.00
quality
Super Pro 5 8 Pump Mechanical Seal 200 354545 SPX 1250X Z 2 92500150 A 8 NEW
Super Pro 5 8 Pump Mechanical Seal 200 354545 SPX 1250X Z 2 92500150 A 8 NEW
$12.50
quality
NEW CHESTERTON 442 695816 MECHANICAL 43M SEAL STAINLESS REPLACEMENT PART 200263
NEW CHESTERTON 442 695816 MECHANICAL 43M SEAL STAINLESS REPLACEMENT PART 200263
$175.00
quality
NEW IN BOX PPC 2 1 4 ULTRASEAL 789 316 GRAF HC 10 CAR TC MECHANICAL SEAL
NEW IN BOX PPC 2 1 4 ULTRASEAL 789 316 GRAF HC 10 CAR TC MECHANICAL SEAL
$74.80
quality
ALFA LAVAL 9612711801 MECHANICAL SEAL KIT
ALFA LAVAL 9612711801 MECHANICAL SEAL KIT
$50.95
quality
2 Flexibox 4 3 4 FFST Mechanical Seals
2 Flexibox 4 3 4 FFST Mechanical Seals
$1,000.00
quality
Tuthill Mechanical Seal Type 2 BF871 Buna N 0009192ANEW
Tuthill Mechanical Seal Type 2 BF871 Buna N 0009192ANEW
$75.00
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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