Mechanical Seal

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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
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
$29.99
quality
Mechanical Seal Crane type 9  4
Mechanical Seal Crane type 9 4
$325.00
quality
NIB SEPCO UCA0024HOS XIXA 01 MECHANICAL SEAL
NIB SEPCO UCA0024HOS XIXA 01 MECHANICAL SEAL
$750.95
quality
Chesterton Mechanical Seal 891 732 60M SA CB TC shaft 60M or25 item698766
Chesterton Mechanical Seal 891 732 60M SA CB TC shaft 60M or25 item698766
$125.00
quality
FlowServe split mechanical seal 750 DMC A23C7500P33 P79654 99
FlowServe split mechanical seal 750 DMC A23C7500P33 P79654 99
$88.00
quality
JOHN CRANE 375 MECHANICAL SEAL H37510250550 0715MG
JOHN CRANE 375 MECHANICAL SEAL H37510250550 0715MG
$299.99
quality
Wacker Trash Pump Mechanical Seal Fits New Style PT2 PT2A PT2H PT2V
Wacker Trash Pump Mechanical Seal Fits New Style PT2 PT2A PT2H PT2V
$34.98
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
US Seal PS 788 BMFKF Mechanical Seal
US Seal PS 788 BMFKF Mechanical Seal
$35.80
quality
JOHN CRANE M103771 TYPE 5610 MECHANICAL 2 1 4 IN ID STAINLESS PUMP SEAL B468683
JOHN CRANE M103771 TYPE 5610 MECHANICAL 2 1 4 IN ID STAINLESS PUMP SEAL B468683
$400.00
quality
KSB 4334 MECHANICAL SEAL WITH EAGLE BURGMANN 14401 CASING
KSB 4334 MECHANICAL SEAL WITH EAGLE BURGMANN 14401 CASING
$99.99
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
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DYNA TECH MECHANICAL SEAL DURA BM137219 4 15 16
DYNA TECH MECHANICAL SEAL DURA BM137219 4 15 16
$1,800.00
quality
EagleBurgmann Cartex ASPN Mechanical Seal
EagleBurgmann Cartex ASPN Mechanical Seal
$375.00
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Hydro Ergoseal Inc Mechanical Seal Assembly 5S ES022
Hydro Ergoseal Inc Mechanical Seal Assembly 5S ES022
$15.99
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Mechanical Seal MG901S10 1250 G302
Mechanical Seal MG901S10 1250 G302
$45.50
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NEW SEPCO MECHANICAL RPL3675A COMPLETE SEAL 1 5 16 PRO
NEW SEPCO MECHANICAL RPL3675A COMPLETE SEAL 1 5 16 PRO
$399.99
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NIB JOHN CRANE MECHANICAL SEAL M12199 TYPE 21 SIZE 1375 IN POLISH
NIB JOHN CRANE MECHANICAL SEAL M12199 TYPE 21 SIZE 1375 IN POLISH
$95.20
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Double Mechanical Seal
Double Mechanical Seal
$25.00
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
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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
NEW JOHN CRANE BF501C1 MECHANICAL TYPE 1 PUMP SEAL REPLACEMENT PART B444512
NEW JOHN CRANE BF501C1 MECHANICAL TYPE 1 PUMP SEAL REPLACEMENT PART B444512
$60.00
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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
AesSeal BSIV BSIVN Cartridge Mechanical Seal
AesSeal BSIV BSIVN Cartridge Mechanical Seal
$199.00
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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
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Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 1
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 1
$449.99
quality
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 2
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 2
$449.99
quality
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 3
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 3
$449.99
quality
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 4
Five Star Flowserve Series 84 Fluid Seal Factory Refurbished Mechanical Seal 4
$449.99
quality
Five Star Flowserve Series 85 Slurry Seal Refurbished Mechanical Seal 1
Five Star Flowserve Series 85 Slurry Seal Refurbished Mechanical Seal 1
$449.99
quality
Five Star Flowserve Series 85 Slurry Seal Refurbished Mechanical Seal 2
Five Star Flowserve Series 85 Slurry Seal Refurbished Mechanical Seal 2
$449.99
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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
Pillar DNS Dai Nippon Screen Mechanical Shaft Seal 10625 OD 8 ID
Pillar DNS Dai Nippon Screen Mechanical Shaft Seal 10625 OD 8 ID
$23.99
quality
NEW Sundyne Lower Mechanical Seal SE04AA12K LMV 806 3708572
NEW Sundyne Lower Mechanical Seal SE04AA12K LMV 806 3708572
$200.00
quality
NEW Sundyne Upper Mechanical Seal SE04AA18F LMV 806 3708570
NEW Sundyne Upper Mechanical Seal SE04AA18F LMV 806 3708570
$200.00
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John Crane Inc B391 52 Mechanical Seal 1 7 8 Dia Rubber SS Body
John Crane Inc B391 52 Mechanical Seal 1 7 8 Dia Rubber SS Body
$409.00
quality
NEW JOHN CRANE N982 66 MECHANICAL SEAL N98266
NEW JOHN CRANE N982 66 MECHANICAL SEAL N98266
$350.00
quality
NEW MECHANICAL SEAL 950 024 SAC 914
NEW MECHANICAL SEAL 950 024 SAC 914
$24.95
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
$557.95
quality
FLOWSERVE P 50 MECHANICAL SEAL 2 3 8 BORE STAINLESS STEEL
FLOWSERVE P 50 MECHANICAL SEAL 2 3 8 BORE STAINLESS STEEL
$89.99
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New Dunham Bush MEPCO 3179 Mechanical Pump Seal for A 9 Pumps
New Dunham Bush MEPCO 3179 Mechanical Pump Seal for A 9 Pumps
$40.80
quality
1 NEW EGG SEALOL RSD76006 MECHANICAL SEAL NIB
1 NEW EGG SEALOL RSD76006 MECHANICAL SEAL NIB
$19.99
quality
JOHN CRANE MECHANICAL SINGLE CARTRIDGE SEAL TYPE 1648
JOHN CRANE MECHANICAL SINGLE CARTRIDGE SEAL TYPE 1648
$650.00
quality
NIB JOHN CRANE MECHANICAL SEAL SIZE 125 M013 29 FSP8054 TYPE 1 FREE SHIPPING
NIB JOHN CRANE MECHANICAL SEAL SIZE 125 M013 29 FSP8054 TYPE 1 FREE SHIPPING
$150.00
quality
NEW IN BOX BELL  GOSSETT 52 121 998 803A MECHANICAL SEAL
NEW IN BOX BELL GOSSETT 52 121 998 803A MECHANICAL SEAL
$49.99
quality
DYNA TECH MECHANICAL SEAL DELTA 2000 SIZE 2 1 2
DYNA TECH MECHANICAL SEAL DELTA 2000 SIZE 2 1 2
$125.00
quality
Mechanical Seal Viton Dia 5 8 In
Mechanical Seal Viton Dia 5 8 In
$47.69
quality
QTY 160 Pool  Spa pump motor Mechanical Seal PS100
QTY 160 Pool Spa pump motor Mechanical Seal PS100
$329.00
quality
Mechanical Seal Assembly ASI Mod 585 2 size 3250 NIB 222I52A 01AB8S
Mechanical Seal Assembly ASI Mod 585 2 size 3250 NIB 222I52A 01AB8S
$250.00
quality
Mechanical Seal Buna N Dia 5 8 In
Mechanical Seal Buna N Dia 5 8 In
$12.09
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
Flowserve Mechanical Single Cartridge Seal 1 3 4 p n85 14SAGF New Goulds 5 star
Flowserve Mechanical Single Cartridge Seal 1 3 4 p n85 14SAGF New Goulds 5 star
$250.00
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
Burgmann Cavity Pump Mechanical Seal MG1 70 Z
Burgmann Cavity Pump Mechanical Seal MG1 70 Z
$129.00
quality
Type 16 Mechanical Shaft Seal 100 SE Pool Spa Pac Seal NEW
Type 16 Mechanical Shaft Seal 100 SE Pool Spa Pac Seal NEW
$7.03
quality
Dayton 1R306 Shaft Seal Pump Shaft 5 8 Inch Mechanical Shaft Seal NEW
Dayton 1R306 Shaft Seal Pump Shaft 5 8 Inch Mechanical Shaft Seal NEW
$14.95
quality
NEW BURGMANN 041574000 MECHANICAL SEAL MG1S1 635 G3 E1 Q1Q1PGG 928367
NEW BURGMANN 041574000 MECHANICAL SEAL MG1S1 635 G3 E1 Q1Q1PGG 928367
$275.00
quality
NEW JOHN CRANE B17187 MECHANICAL SEAL TYPE 21 SZ 1250 D380263
NEW JOHN CRANE B17187 MECHANICAL SEAL TYPE 21 SZ 1250 D380263
$33.50
quality
John Crane spilt mechanical seal repair 30 type 37FS B366 65 B36665 3710 24B
John Crane spilt mechanical seal repair 30 type 37FS B366 65 B36665 3710 24B
$88.00
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
$8.75
quality
John Crane spilt mechanical seal repair 375 type 37FS 30 M35278
John Crane spilt mechanical seal repair 375 type 37FS 30 M35278
$140.00
quality
Flowserve 20 Cartridge dual bellows Mechanical Seal X 200 127353 HASTELLOY C
Flowserve 20 Cartridge dual bellows Mechanical Seal X 200 127353 HASTELLOY C
$135.00
quality
2 MECOSEL 5330402324 Seal Mechanical 15 16 Rotary Unit T1252
2 MECOSEL 5330402324 Seal Mechanical 15 16 Rotary Unit T1252
$50.00
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
CHESTERTON 880 24 MECHANICAL PUMP SEAL T13018
CHESTERTON 880 24 MECHANICAL PUMP SEAL T13018
$60.00
quality
Mechanical shaft seal Borg Warner UHT 7500
Mechanical shaft seal Borg Warner UHT 7500
$1,400.00
quality
EAGLE BURGMANN CARTEX DN 20 E1 MECHANICAL SEAL ASSEMBLY 066082010 REV III
EAGLE BURGMANN CARTEX DN 20 E1 MECHANICAL SEAL ASSEMBLY 066082010 REV III
$269.99
quality
BURKS 9696 PUMP MECHANICAL REPLACEMENT SEAL 290V 5 8 BORE
BURKS 9696 PUMP MECHANICAL REPLACEMENT SEAL 290V 5 8 BORE
$39.99
quality
NIB John Crane D 2000 318 0800 Mechanical Seal D20003180800 NEW IN BOX
NIB John Crane D 2000 318 0800 Mechanical Seal D20003180800 NEW IN BOX
$59.99
quality
37940 New In box Hutcheson Engineering 10K25 VI Mechanical Pump Seal 2 OD
37940 New In box Hutcheson Engineering 10K25 VI Mechanical Pump Seal 2 OD
$48.25
quality
FLOWSERVE XC3B3000CY3 03 359997 MECHANICAL 3IN DURA PUMP SEAL PART B331562
FLOWSERVE XC3B3000CY3 03 359997 MECHANICAL 3IN DURA PUMP SEAL PART B331562
$512.10
quality
John Crane Packing R143 F23 Mechanical Pump Seal Assembly 13 16 inside diameter
John Crane Packing R143 F23 Mechanical Pump Seal Assembly 13 16 inside diameter
$25.00
quality
NEW JOHN CRANE BF501C1 MECHANICAL TYPE 21 PUMP SEAL REPLACEMENT PART B444516
NEW JOHN CRANE BF501C1 MECHANICAL TYPE 21 PUMP SEAL REPLACEMENT PART B444516
$55.00
quality
NEW JOHN CRANE B14174 MECHANICAL SEAL ASSEMBLY TYPE 21 SZ 1250IN D381317
NEW JOHN CRANE B14174 MECHANICAL SEAL ASSEMBLY TYPE 21 SZ 1250IN D381317
$23.50
quality
AIRTECH 2BY20780BV035A MECHANICAL SEAL NEW
AIRTECH 2BY20780BV035A MECHANICAL SEAL NEW
$8.00
quality
NEW VIKING 2 477 02 999 PUMP MECHANICAL SEAL REPLACEMENT PART D395869
NEW VIKING 2 477 02 999 PUMP MECHANICAL SEAL REPLACEMENT PART D395869
$50.00
quality
Flowserve VRA Mechanical Seal P N 417089 G 2250 Product S0N VRA NIB
Flowserve VRA Mechanical Seal P N 417089 G 2250 Product S0N VRA NIB
$325.00
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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