Mechanical Seal

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JOHN CRANE 1 1 2 ID x 2 OD EGG 02013878 MECHANICAL SEAL 670 AHC TGC 000 22
JOHN CRANE 1 1 2 ID x 2 OD EGG 02013878 MECHANICAL SEAL 670 AHC TGC 000 22
$108.00
quality
JOHN CRANE SE2 77 QREG 302747 SAFEMATIC 3IN MECHANICAL PUMP SEAL PART B354651
JOHN CRANE SE2 77 QREG 302747 SAFEMATIC 3IN MECHANICAL PUMP SEAL PART B354651
$488.43
quality
New John Crane Mechanical Seal IS20 2F 8C 3750 type1 b205 39 BF5017118 8
New John Crane Mechanical Seal IS20 2F 8C 3750 type1 b205 39 BF5017118 8
$1,199.00
quality
FLOWTECH INC MECHANICAL PUMP SHAFT SEAL 5105 21MM SiC VS TC
FLOWTECH INC MECHANICAL PUMP SHAFT SEAL 5105 21MM SiC VS TC
$14.99
quality
NEW EAGLE BURGMANN CARTEX DN20 E2 MECHANICAL SEAL ASSEMBLY V16MG BQ1V16MG
NEW EAGLE BURGMANN CARTEX DN20 E2 MECHANICAL SEAL ASSEMBLY V16MG BQ1V16MG
$539.99
quality
NEW EAGLE BURGMANN CARTEX DN 20 E2 MECHANICAL SEAL ASSEMBLY Q1Q1V16MG BQ1V16MG
NEW EAGLE BURGMANN CARTEX DN 20 E2 MECHANICAL SEAL ASSEMBLY Q1Q1V16MG BQ1V16MG
$969.99
quality
Pac Seal Type 16 Pump Shaft Mechanical Seal
Pac Seal Type 16 Pump Shaft Mechanical Seal
$8.00
quality
NEW ROBCO 100 50MM ADAPTER PLATE MECHANICAL SEAL STAINLESS REPLACEMENT B206477
NEW ROBCO 100 50MM ADAPTER PLATE MECHANICAL SEAL STAINLESS REPLACEMENT B206477
$237.53
quality
CHESTERTON 880 24 MECHANICAL PUMP SEAL T13018
CHESTERTON 880 24 MECHANICAL PUMP SEAL T13018
$60.00
quality
JOHN CRANE SEAL ASSEMBLY 4625 ESP SIZE MECHANICAL SEAL New in BOX
JOHN CRANE SEAL ASSEMBLY 4625 ESP SIZE MECHANICAL SEAL New in BOX
$395.00
quality
NEW DURCO E75KFVV MECHANICAL SINGLE INTERNAL PUMP SEAL PART B485979
NEW DURCO E75KFVV MECHANICAL SINGLE INTERNAL PUMP SEAL PART B485979
$70.00
quality
GOULDS PUMPS 10K94 Mechanical Seal
GOULDS PUMPS 10K94 Mechanical Seal
$165.88
quality
GARLOCK MECHANICAL SEAL 1 13 16 71516 7850 VITON CRB NIR
GARLOCK MECHANICAL SEAL 1 13 16 71516 7850 VITON CRB NIR
$59.00
quality
NEW JOHN CRANE SAF 150 TREN 304594 5 3 4IN MECHANICAL STAINLESS SEAL B404078
NEW JOHN CRANE SAF 150 TREN 304594 5 3 4IN MECHANICAL STAINLESS SEAL B404078
$700.13
quality
PAC SEAL 1R306 5 8 MECHANICAL SHAFT SEAL KIT
PAC SEAL 1R306 5 8 MECHANICAL SHAFT SEAL KIT
$9.99
quality
Flex A Seal FL 145M Mechanical Seal
Flex A Seal FL 145M Mechanical Seal
$55.00
quality
John Crane 40 mechanical seal T8B1 32A 8B1 part  B91244
John Crane 40 mechanical seal T8B1 32A 8B1 part B91244
$458.00
quality
GORMAN RUPP 12590 FACTORY MECHANICAL SEAL SERVICE REPAIR KIT NEW IN BOX
GORMAN RUPP 12590 FACTORY MECHANICAL SEAL SERVICE REPAIR KIT NEW IN BOX
$160.00
quality
Flowserve Mechanical Seal 1875 Part85 15AVP SilCar vs SilCar Viton Elastomers
Flowserve Mechanical Seal 1875 Part85 15AVP SilCar vs SilCar Viton Elastomers
$500.00
quality
FlowServe 550 split mechanical seal 1360593 assembly 162774
FlowServe 550 split mechanical seal 1360593 assembly 162774
$425.00
quality
135433 New No Box Ingersoll Rand P02887 Mechanical Seal Rotor
135433 New No Box Ingersoll Rand P02887 Mechanical Seal Rotor
$61.06
quality
3437 SEALOL 670 LHT SBF 217 60 mechanical seal 670LHTSBF21760 0986984
3437 SEALOL 670 LHT SBF 217 60 mechanical seal 670LHTSBF21760 0986984
$150.00
quality
DAYTON PPHP51000219G Mechanical Seal Repair Kit
DAYTON PPHP51000219G Mechanical Seal Repair Kit
$201.07
quality
DAYTON PPHP51000212G Mechanical Seal Repair Kit
DAYTON PPHP51000212G Mechanical Seal Repair Kit
$131.14
quality
DAYTON PPR8ZN016G Mechanical Seal Seat Assembly
DAYTON PPR8ZN016G Mechanical Seal Seat Assembly
$32.16
quality
Ingersoll Rand CPM 10408C Pump Seal Repair Kit Industrial Mechanical Seal
Ingersoll Rand CPM 10408C Pump Seal Repair Kit Industrial Mechanical Seal
$149.99
quality
PPUP5007G Mechanical Seal Assembly
PPUP5007G Mechanical Seal Assembly
$34.55
quality
DAYTON PP800005G Mechanical Seal Assembly
DAYTON PP800005G Mechanical Seal Assembly
$64.53
quality
DAYTON PPO8ZN015G Mechanical Seal Seat Assembly
DAYTON PPO8ZN015G Mechanical Seal Seat Assembly
$29.92
quality
DAYTON PPO83N001G Mechanical Seal Seat Assembly
DAYTON PPO83N001G Mechanical Seal Seat Assembly
$36.31
quality
DAYTON PP201100061G Mechanical Seal
DAYTON PP201100061G Mechanical Seal
$208.54
quality
DAYTON PP820006G Mechanical Seal Assembly
DAYTON PP820006G Mechanical Seal Assembly
$64.53
quality
DAYTON PPO8ZN041G Mechanical Seal Seat Assembly
DAYTON PPO8ZN041G Mechanical Seal Seat Assembly
$47.35
quality
DAYTON PPL3315G Buna N Mechanical Seal
DAYTON PPL3315G Buna N Mechanical Seal
$32.16
quality
DAYTON 201100051 Mechanical Seal
DAYTON 201100051 Mechanical Seal
$120.02
quality
DAYTON 201100061 Mechanical Seal
DAYTON 201100061 Mechanical Seal
$201.69
quality
DAYTON PP201100071G Mechanical Seal
DAYTON PP201100071G Mechanical Seal
$136.95
quality
DAYTON PPHP51000222G Mechanical Seal Repair Kit
DAYTON PPHP51000222G Mechanical Seal Repair Kit
$67.77
quality
DAYTON PP810008G Mechanical Seal Assembly
DAYTON PP810008G Mechanical Seal Assembly
$64.53
quality
DAYTON PPHP51000203G Mechanical Seal Repair Kit
DAYTON PPHP51000203G Mechanical Seal Repair Kit
$63.25
quality
DAYTON PPO82N001G Mechanical Seal Seat Assembly
DAYTON PPO82N001G Mechanical Seal Seat Assembly
$33.28
quality
DAYTON PP201100031G Mechanical Seal
DAYTON PP201100031G Mechanical Seal
$58.64
quality
DAYTON 201100011 Mechanical Seal
DAYTON 201100011 Mechanical Seal
$42.83
quality
DAYTON PPO8ZN040G Mechanical Seal Seat Assembly
DAYTON PPO8ZN040G Mechanical Seal Seat Assembly
$46.48
quality
DAYTON PPR8ZN006G Mechanical Seal Seat Assembly
DAYTON PPR8ZN006G Mechanical Seal Seat Assembly
$32.16
quality
PPUP6003G Mechanical Seal Assembly
PPUP6003G Mechanical Seal Assembly
$68.55
quality
PPUP4004G Mechanical Seal Assembly
PPUP4004G Mechanical Seal Assembly
$34.55
quality
DAYTON 201100031 Mechanical Seal
DAYTON 201100031 Mechanical Seal
$58.64
quality
DAYTON PPO85N001G Mechanical Seal Seat Assembly
DAYTON PPO85N001G Mechanical Seal Seat Assembly
$60.34
quality
DAYTON PPHP51000206G Mechanical Seal Repair Kit
DAYTON PPHP51000206G Mechanical Seal Repair Kit
$90.89
quality
DAYTON PPR8ZN007G Mechanical Seal Seat Assembly
DAYTON PPR8ZN007G Mechanical Seal Seat Assembly
$33.28
quality
DAYTON PPO8ZN016G Mechanical Seal Seat Assembly
DAYTON PPO8ZN016G Mechanical Seal Seat Assembly
$45.86
quality
RX 686 NEW JOHN CRANE RG5301 MECHANICAL SEAL ASSEMBLY TYPE 8 1 SIZE 1500
RX 686 NEW JOHN CRANE RG5301 MECHANICAL SEAL ASSEMBLY TYPE 8 1 SIZE 1500
$199.00
quality
FLOWSERVE SPM600 MECHANICAL DUAL CARTRIDGE 4 IN STAINLESS PUMP SEAL B471002
FLOWSERVE SPM600 MECHANICAL DUAL CARTRIDGE 4 IN STAINLESS PUMP SEAL B471002
$1,000.00
quality
BSM Pump Rotary Gear Pump Repair Parts 3 mechanical seal units Set of 4
BSM Pump Rotary Gear Pump Repair Parts 3 mechanical seal units Set of 4
$199.99
quality
GOULDS PUMPS 10K100 Mechanical Seal
GOULDS PUMPS 10K100 Mechanical Seal
$225.88
quality
RX 687 NEW JOHN CRANE B091 51 MECHANICAL SEAL SIZE 1500 TYPE 1 DSP1624
RX 687 NEW JOHN CRANE B091 51 MECHANICAL SEAL SIZE 1500 TYPE 1 DSP1624
$45.00
quality
NEW BLACKMER 331880 MECHANICAL SEAL STEEL PUMP SEAL REPLACEMENT PART D458946
NEW BLACKMER 331880 MECHANICAL SEAL STEEL PUMP SEAL REPLACEMENT PART D458946
$105.00
quality
RX 689 NEW JOHN CRANE B086 47 MECHANICAL SEAL ASSEMBLY TYPE 2 SIZE 1250
RX 689 NEW JOHN CRANE B086 47 MECHANICAL SEAL ASSEMBLY TYPE 2 SIZE 1250
$45.00
quality
SEAL MECHANICAL VITON INTERVAC VACUUM PUMP 950075SAC915
SEAL MECHANICAL VITON INTERVAC VACUUM PUMP 950075SAC915
$218.88
quality
NEW BLACKMER 337765 MECHANICAL PUMP SEAL
NEW BLACKMER 337765 MECHANICAL PUMP SEAL
$155.00
quality
JOHN CRANE 611QGCSBR337 22 611Q MECHANICAL 1 3 8IN STAINLESS PUMP SEAL B460252
JOHN CRANE 611QGCSBR337 22 611Q MECHANICAL 1 3 8IN STAINLESS PUMP SEAL B460252
$325.00
quality
Flowserve Fybroc 1375 MECHANICAL SEAL 96940M Assembly NEW
Flowserve Fybroc 1375 MECHANICAL SEAL 96940M Assembly NEW
$79.55
quality
Delta mechanical seal AV30X01250A model 3000 1250 size New
Delta mechanical seal AV30X01250A model 3000 1250 size New
$99.00
quality
PAC SEAL 1R306 5 8 MECHANICAL SHAFT SEAL KIT
PAC SEAL 1R306 5 8 MECHANICAL SHAFT SEAL KIT
$17.99
quality
Chesterton S10 TC SSC Cassette Type Cartridge Mechanical Seal 1375  328421
Chesterton S10 TC SSC Cassette Type Cartridge Mechanical Seal 1375 328421
$499.00
quality
NEW DAYTON 1R298 PUMP MECHANICAL SHAFT SEAL KIT D491099
NEW DAYTON 1R298 PUMP MECHANICAL SHAFT SEAL KIT D491099
$25.00
quality
Chesterton 714 Ceramic Mechanical Pump SEAL 059651 size 36 shaft 4500 NEW NIB
Chesterton 714 Ceramic Mechanical Pump SEAL 059651 size 36 shaft 4500 NEW NIB
$19.99
quality
NEW GARLOCK PK MECHANICAL SEAL 1 5 8 SHAFT 70005 0021 BRASS NITRILE CERAMIC
NEW GARLOCK PK MECHANICAL SEAL 1 5 8 SHAFT 70005 0021 BRASS NITRILE CERAMIC
$25.00
quality
JOHN CRANE  48LP 3250  CARTRIDGE MECHANICAL STAINLESS PUMP SEAL 325 Shaft
JOHN CRANE 48LP 3250 CARTRIDGE MECHANICAL STAINLESS PUMP SEAL 325 Shaft
$995.00
quality
NEW INGERSOLL RAND CPM10372C MECHANICAL PUMP SEAL REPLACEMENT PART B485913
NEW INGERSOLL RAND CPM10372C MECHANICAL PUMP SEAL REPLACEMENT PART B485913
$250.00
quality
NEW 6765583 MECHANICAL ASSEMBLY PUMP SEAL REPLACEMENT PART B485953
NEW 6765583 MECHANICAL ASSEMBLY PUMP SEAL REPLACEMENT PART B485953
$100.00
quality
FLOWSERVE MECHANICAL SEAL PART NUMBER 806126 00 NEW IN BOX
FLOWSERVE MECHANICAL SEAL PART NUMBER 806126 00 NEW IN BOX
$29.95
quality
ROPER G4 1 Trash Pump Mechanical Seal Fits Paco Pacific Pump 1 1 4 SHAFT 598V
ROPER G4 1 Trash Pump Mechanical Seal Fits Paco Pacific Pump 1 1 4 SHAFT 598V
$29.99
quality
Travaini Pump Mechanical Seal P N 95B035FMA92K NEW ROTEN Uniten 4K 35
Travaini Pump Mechanical Seal P N 95B035FMA92K NEW ROTEN Uniten 4K 35
$34.75
quality
1 NEW BLACKMER 333044 MECHANICAL SEAL NIB MAKE OFFER
1 NEW BLACKMER 333044 MECHANICAL SEAL NIB MAKE OFFER
$145.99
quality
John Crane 812255 48N2 Split mechanical seal 30 type 3710 24A 300 inch
John Crane 812255 48N2 Split mechanical seal 30 type 3710 24A 300 inch
$320.00
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
$21.99
quality
Paco Genuine Mechanical Seal Kit 91909832 New in Box
Paco Genuine Mechanical Seal Kit 91909832 New in Box
$150.00
quality
FLINT  WALLING 131100 Mechanical SealBuna NDia 5 8 In Pumps  plumbing Pump
FLINT WALLING 131100 Mechanical SealBuna NDia 5 8 In Pumps plumbing Pump
$8.46
quality
Stranco Seal W2T2088 Mechanical Mix Chamber 625 Pump Part NEW IN BOX
Stranco Seal W2T2088 Mechanical Mix Chamber 625 Pump Part NEW IN BOX
$70.00
quality
NEW 9612711803 SS mechanical pump seal kit CL Pump DG C SiC V 3175mm 100589
NEW 9612711803 SS mechanical pump seal kit CL Pump DG C SiC V 3175mm 100589
$19.99
quality
New Roten Camseal Mechanical Seal 40R34
New Roten Camseal Mechanical Seal 40R34
$20.00
quality
VICTAULIC 2 X 1 1 2 MECHANICAL T BOLTED BRANCH OUTLET S 920N NEW SEALED
VICTAULIC 2 X 1 1 2 MECHANICAL T BOLTED BRANCH OUTLET S 920N NEW SEALED
$29.99
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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