Mechanical Seal

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New Chesterton Split Mechanical Face Seal 442 442 40 Pat  4576384
New Chesterton Split Mechanical Face Seal 442 442 40 Pat 4576384
$1,999.00
quality
New Skidmore 5 8 Type S Mechanical Pump Seal Kit 142 54052
New Skidmore 5 8 Type S Mechanical Pump Seal Kit 142 54052
$45.00
quality
New Skidmore 7 8 Type S Mechanical Pump Seal Kit 142 54055
New Skidmore 7 8 Type S Mechanical Pump Seal Kit 142 54055
$75.00
quality
New Skidmore 1 1 8 Type S Mechanical Pump Seal Kit Kit No 142 54058
New Skidmore 1 1 8 Type S Mechanical Pump Seal Kit Kit No 142 54058
$65.00
quality
Mechanical seal 1 1 4 ID 2 OD Viton Shaft Seal
Mechanical seal 1 1 4 ID 2 OD Viton Shaft Seal
$20.00
quality
Flowserve Mechanical Seal Product 168965 GMSV Shaft Size 0060mm S359529 NIB
Flowserve Mechanical Seal Product 168965 GMSV Shaft Size 0060mm S359529 NIB
$750.00
quality
Durametallic 52948 Mechanical Seal 1 1 8 NOS
Durametallic 52948 Mechanical Seal 1 1 8 NOS
$69.95
quality
LOT 2 NEW KRONES 1 090 08 066 0 MECHANICAL SEAL 3 7 8X2 3 8X5 8IN D271267
LOT 2 NEW KRONES 1 090 08 066 0 MECHANICAL SEAL 3 7 8X2 3 8X5 8IN D271267
$23.00
quality
Anchor Packing M13RA0220006 Rota Face Mechanical Seal 13SA RK 1 3 8 NOS
Anchor Packing M13RA0220006 Rota Face Mechanical Seal 13SA RK 1 3 8 NOS
$69.95
quality
JOHN CRANE MECHANICAL SEAL CF SP 75832TY1 875 X P15M015M 4320014153752
JOHN CRANE MECHANICAL SEAL CF SP 75832TY1 875 X P15M015M 4320014153752
$49.99
quality
Mechanical Seal Crane type 9  4
Mechanical Seal Crane type 9 4
$325.00
quality
92647 New No Box Crane 52 104 870 804 Seal mechanical seal kit
92647 New No Box Crane 52 104 870 804 Seal mechanical seal kit
$38.80
quality
EagleBurgmann Cartex ASPN Mechanical Seal
EagleBurgmann Cartex ASPN Mechanical Seal
$350.00
quality
Large mechanics lot of Vintage automotive National Oil seals Victor In boxes
Large mechanics lot of Vintage automotive National Oil seals Victor In boxes
$22.99
quality
NIB SEPCO UCA0024HOS XIXA 01 MECHANICAL SEAL
NIB SEPCO UCA0024HOS XIXA 01 MECHANICAL SEAL
$750.95
quality
Blackmer Mechanical Seal 333049
Blackmer Mechanical Seal 333049
$84.99
quality
Wacker 6 Trash Pump Mechanical Seal Fits PT6LS PT6LT 0082960
Wacker 6 Trash Pump Mechanical Seal Fits PT6LS PT6LT 0082960
$879.90
quality
Dura Seal SL 5000 Mechanical Seal For Pump 4625 Shaft ESKB3535351 Flowserve
Dura Seal SL 5000 Mechanical Seal For Pump 4625 Shaft ESKB3535351 Flowserve
$200.00
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
$168.11
quality
NEW JOHN CRANE BP1C1 MECHANICAL TYPE1 JOINT REPAIR KIT SEAL 1 3 4IN ASSY B215087
NEW JOHN CRANE BP1C1 MECHANICAL TYPE1 JOINT REPAIR KIT SEAL 1 3 4IN ASSY B215087
$45.00
quality
John Crane Mechanical Seal P N B887 52 Type 21 Size 1250 NIB
John Crane Mechanical Seal P N B887 52 Type 21 Size 1250 NIB
$75.00
quality
KSB 4334 MECHANICAL SEAL WITH EAGLE BURGMANN 14401 CASING
KSB 4334 MECHANICAL SEAL WITH EAGLE BURGMANN 14401 CASING
$99.99
quality
John Crane PP046 JBA 2375 Mechanical Seal Assembly
John Crane PP046 JBA 2375 Mechanical Seal Assembly
$99.99
quality
John Crane 9001 04 1 8 Mechanical Rotor Seal 1125
John Crane 9001 04 1 8 Mechanical Rotor Seal 1125
$64.99
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
$2.99
quality
LOT 4 NEW SUNDSTRAND SE04 UTOL 2 MECHANICAL SEAL PUMP D291923
LOT 4 NEW SUNDSTRAND SE04 UTOL 2 MECHANICAL SEAL PUMP D291923
$40.00
quality
CHESTERTON CHEMICAL PUMP SEAL 1 1 8 MECHANICAL 043301
CHESTERTON CHEMICAL PUMP SEAL 1 1 8 MECHANICAL 043301
$199.99
quality
John Crane Double Mechanical Seal M0828 45 Lightnin Rebuild Kit P NE41546 NIB
John Crane Double Mechanical Seal M0828 45 Lightnin Rebuild Kit P NE41546 NIB
$500.00
quality
NIB BLACKMER 331604 MECHANICAL PUMP SEAL ASSEMBLY
NIB BLACKMER 331604 MECHANICAL PUMP SEAL ASSEMBLY
$105.00
quality
DYNA TECH MECHANICAL SEAL DURA BM137219 4 15 16
DYNA TECH MECHANICAL SEAL DURA BM137219 4 15 16
$1,800.00
quality
Double Mechanical Seal
Double Mechanical Seal
$25.00
quality
Mechanical Seal MG901S10 1250 G302
Mechanical Seal MG901S10 1250 G302
$45.50
quality
NEW SEPCO MECHANICAL RPL3675A COMPLETE SEAL 1 5 16 PRO
NEW SEPCO MECHANICAL RPL3675A COMPLETE SEAL 1 5 16 PRO
$399.99
quality
NIB JOHN CRANE MECHANICAL SEAL M38490 TYPE 21 SIZE 1250 POLISH
NIB JOHN CRANE MECHANICAL SEAL M38490 TYPE 21 SIZE 1250 POLISH
$119.00
quality
NIB JOHN CRANE MECHANICAL SEAL M12199 TYPE 21 SIZE 1375 IN POLISH
NIB JOHN CRANE MECHANICAL SEAL M12199 TYPE 21 SIZE 1375 IN POLISH
$119.00
quality
1 NEW EGG 54445 R301 22 SEALOL MECHANICAL SEAL ASSEMBLY NIB
1 NEW EGG 54445 R301 22 SEALOL MECHANICAL SEAL ASSEMBLY NIB
$109.99
quality
Mechanical Seal Kit SUDMO 2123585
Mechanical Seal Kit SUDMO 2123585
$0.99
quality
NEW FLOWSERVE 155349PS2 PSS II MECHANICAL 1687IN PUMP SEAL PART D292694
NEW FLOWSERVE 155349PS2 PSS II MECHANICAL 1687IN PUMP SEAL PART D292694
$750.00
quality
NEW FRYMA 305032 MECHANICAL 1IN PUMP SEAL REPLACEMENT PART B326396
NEW FRYMA 305032 MECHANICAL 1IN PUMP SEAL REPLACEMENT PART B326396
$149.00
quality
SEAL SMP PUMP MECHANICAL SEAL REPLACEMENT KIT 1000  2000 SERIES w 3 4 SHAFT
SEAL SMP PUMP MECHANICAL SEAL REPLACEMENT KIT 1000 2000 SERIES w 3 4 SHAFT
$59.99
quality
CHESTERTON 442 16 SPLIT MECHANICAL SEAL 2 SHAFT SIZE NEW CONDITION IN BOX
CHESTERTON 442 16 SPLIT MECHANICAL SEAL 2 SHAFT SIZE NEW CONDITION IN BOX
$1,200.00
quality
NIB AES Seal CURE Mechanical Cartridge Seal w Low Pressure External Seal
NIB AES Seal CURE Mechanical Cartridge Seal w Low Pressure External Seal
$99.99
quality
SKIDMORE 5 8 S TYPE MECHANICAL SEAL KIT 142 54052 W EXTRA SEAL
SKIDMORE 5 8 S TYPE MECHANICAL SEAL KIT 142 54052 W EXTRA SEAL
$125.00
quality
NEW JOHN CRANE 8000 MECHANICAL PUMP SEAL REPLACEMENT PART B292410
NEW JOHN CRANE 8000 MECHANICAL PUMP SEAL REPLACEMENT PART B292410
$45.00
quality
JOHN CRANE 680 X26 0001 SEALOL MECHANICAL PUMP SEAL REPLACEMENT PART B292371
JOHN CRANE 680 X26 0001 SEALOL MECHANICAL PUMP SEAL REPLACEMENT PART B292371
$198.00
quality
Durametallic Mechanical Seal Dura Seal Double MRA
Durametallic Mechanical Seal Dura Seal Double MRA
$50.00
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
$42.99
quality
AESSEAL 45 MM MECHANICAL CLIP SEAL
AESSEAL 45 MM MECHANICAL CLIP SEAL
$129.99
quality
FLUIDTEC 175 MECHANICAL SEAL STYLE62
FLUIDTEC 175 MECHANICAL SEAL STYLE62
$99.99
quality
NEW FLOWSERVE 385349 1750IN SHAFT MECHANICAL PUMP SEAL STAINLESS PART D292964
NEW FLOWSERVE 385349 1750IN SHAFT MECHANICAL PUMP SEAL STAINLESS PART D292964
$200.00
quality
NEW FLOWSERVE GEB2848681B P 50 DURA SEAL 2IN MECHANICAL PUMP SEAL D293135
NEW FLOWSERVE GEB2848681B P 50 DURA SEAL 2IN MECHANICAL PUMP SEAL D293135
$200.00
quality
NEW FLOWSERVE 109963 DURAMETALLIC 1 3 4IN SINGLE MECHANICAL PUMP SEAL D293163
NEW FLOWSERVE 109963 DURAMETALLIC 1 3 4IN SINGLE MECHANICAL PUMP SEAL D293163
$200.00
quality
NEW CRANE 0030877 MECHANICAL PUMP SEAL REPLACEMENT PART B292203
NEW CRANE 0030877 MECHANICAL PUMP SEAL REPLACEMENT PART B292203
$45.00
quality
IKA MECHANICAL SEAL DN2 38 E2
IKA MECHANICAL SEAL DN2 38 E2
$600.00
quality
NEW MECHANICAL SEAL 950 024 SAC 914
NEW MECHANICAL SEAL 950 024 SAC 914
$24.95
quality
Durametallic duraseal  45290 mechanical shaft seal
Durametallic duraseal 45290 mechanical shaft seal
$100.00
quality
FLOWSERVE P 50 MECHANICAL SEAL 2 3 8 BORE STAINLESS STEEL
FLOWSERVE P 50 MECHANICAL SEAL 2 3 8 BORE STAINLESS STEEL
$109.99
quality
New Dunham Bush MEPCO 3179 Mechanical Pump Seal for A 9 Pumps
New Dunham Bush MEPCO 3179 Mechanical Pump Seal for A 9 Pumps
$43.20
quality
New Dunham Bush MEPCO S 472 Mechanical Pump Seal for CHV Model D
New Dunham Bush MEPCO S 472 Mechanical Pump Seal for CHV Model D
$52.20
quality
JOHN CRANE M105006 TYPE 21 MECHANICAL 1 1 4IN FACE SEAL REPLACEMENT PART B253820
JOHN CRANE M105006 TYPE 21 MECHANICAL 1 1 4IN FACE SEAL REPLACEMENT PART B253820
$125.00
quality
1 NEW EGG SEALOL RSD76006 MECHANICAL SEAL NIB
1 NEW EGG SEALOL RSD76006 MECHANICAL SEAL NIB
$19.99
quality
JOHN CRANE  SEAL MECHANICALTYPE 1648RS Single CartridgeFluoroelastomer
JOHN CRANE SEAL MECHANICALTYPE 1648RS Single CartridgeFluoroelastomer
$1,500.00
quality
Chesterton Mechanical Seal Assembly Type 123 1875 New
Chesterton Mechanical Seal Assembly Type 123 1875 New
$186.75
quality
NEW FLOWSERVE MEB43486033 A 190MM ID MECHANICAL SEAL STAINLESS B253923
NEW FLOWSERVE MEB43486033 A 190MM ID MECHANICAL SEAL STAINLESS B253923
$200.00
quality
NEW BLACKMER 333025 MECHANICAL PUMP SEAL REPLACEMENT PART D293770
NEW BLACKMER 333025 MECHANICAL PUMP SEAL REPLACEMENT PART D293770
$204.00
quality
NEW TYPE 2 MECHANICAL SEAL 2 3 4 SHAFT
NEW TYPE 2 MECHANICAL SEAL 2 3 4 SHAFT
$75.00
quality
BW IP Type QB Mechanical Seal Flowserve 2R27203 02
BW IP Type QB Mechanical Seal Flowserve 2R27203 02
$249.99
quality
Scot Viton Double Head 125 Type 21 Mechanical Shaft Seal 101000164
Scot Viton Double Head 125 Type 21 Mechanical Shaft Seal 101000164
$80.00
quality
NEW CHESTERTON 166046 MECHANICAL SEAL SPLIT RING 442 190M EXP RING A S 43359
NEW CHESTERTON 166046 MECHANICAL SEAL SPLIT RING 442 190M EXP RING A S 43359
$454.35
quality
NEW JOHN CRANE B66429 MECHANICAL SEAL ASSEMBLY TYPE 21 SIZE SZ 0750 FACE
NEW JOHN CRANE B66429 MECHANICAL SEAL ASSEMBLY TYPE 21 SIZE SZ 0750 FACE
$17.96
quality
NEW NO NAME 13328 MECHANICAL SEAL ASSEMBLY
NEW NO NAME 13328 MECHANICAL SEAL ASSEMBLY
$17.96
quality
mechanical seal plain CB131 23 HH 53J M Pave low CH 53 D E helicopter military
mechanical seal plain CB131 23 HH 53J M Pave low CH 53 D E helicopter military
$53.00
quality
LOT 3 NEW KRONES 1 073 52 260 0 MECHANICAL SEAL 15X8X5MM D271351
LOT 3 NEW KRONES 1 073 52 260 0 MECHANICAL SEAL 15X8X5MM D271351
$16.00
quality
Mechanical Shaft Seal Type 16 100 SE Pool Spa Pac Seal NEW
Mechanical Shaft Seal Type 16 100 SE Pool Spa Pac Seal NEW
$7.64
quality
Burgmann Cavity Pump Mechanical Seal MG1 70 Z
Burgmann Cavity Pump Mechanical Seal MG1 70 Z
$129.00
quality
NEW HARBOUR HSS T21 5 C TC 5 8IN MECHANICAL PUMP SEAL REPLACEMENT PART B292329
NEW HARBOUR HSS T21 5 C TC 5 8IN MECHANICAL PUMP SEAL REPLACEMENT PART B292329
$50.00
quality
HARBOUR HSS T21 10 CC 1 1 4IN T 21 MECHANICAL PUMP SEAL REPLACEMENT PART B292317
HARBOUR HSS T21 10 CC 1 1 4IN T 21 MECHANICAL PUMP SEAL REPLACEMENT PART B292317
$100.00
quality
Mechanical seal 125 in ID Type 1 John Crane
Mechanical seal 125 in ID Type 1 John Crane
$29.99
quality
NEW ROBCO 100 50MM ADAPTER PLATE MECHANICAL SEAL STAINLESS REPLACEMENT B206477
NEW ROBCO 100 50MM ADAPTER PLATE MECHANICAL SEAL STAINLESS REPLACEMENT B206477
$500.00
quality
43005 Mechanical Seal
43005 Mechanical Seal
$49.95
quality
ZENITH 18 79003 0048 1 PUMP MECHANICAL SEAL REPAIR KIT B 9000 GEAR PUMP 79496
ZENITH 18 79003 0048 1 PUMP MECHANICAL SEAL REPAIR KIT B 9000 GEAR PUMP 79496
$125.00
quality
ZENITH 15 54020 0025 3 MECHANICAL SEAL HOUSE
ZENITH 15 54020 0025 3 MECHANICAL SEAL HOUSE
$100.00
quality
NEW DEMING 84876 MECHANICAL PUMP SEAL REPLACEMENT PART B293722
NEW DEMING 84876 MECHANICAL PUMP SEAL REPLACEMENT PART B293722
$44.00
quality
NEW MTH PUMPS 12 1068 01 7 8IN MECHANICAL PUMP SEAL REPLACEMENT PART B293742
NEW MTH PUMPS 12 1068 01 7 8IN MECHANICAL PUMP SEAL REPLACEMENT PART B293742
$44.00
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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