Mechanical Seal

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Double Mechanical Seal
Double Mechanical Seal
$4.99
quality
NEW FLOWSERVE MECHANICAL SEAL GLAND ASSEMBLY 175IN 373574 GF 20
NEW FLOWSERVE MECHANICAL SEAL GLAND ASSEMBLY 175IN 373574 GF 20
$200.00
quality
NEW PRICE PUMP REPAIR KIT 0118 MECHANICAL SEAL T6 BUNA 5 8 HP75
NEW PRICE PUMP REPAIR KIT 0118 MECHANICAL SEAL T6 BUNA 5 8 HP75
$19.99
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
$39.99
quality
New Roten Camseal Mechanical Seal 40R34
New Roten Camseal Mechanical Seal 40R34
$18.00
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
Garlock 7000 0027 Mechanical Seal NEW
Garlock 7000 0027 Mechanical Seal NEW
$60.00
quality
 JOHN CRAIN 4600 SERIES A40237 MECHANICAL SEAL
JOHN CRAIN 4600 SERIES A40237 MECHANICAL SEAL
$49.99
quality
Blackmer TXDA 25 Pump Mechanical Seal
Blackmer TXDA 25 Pump Mechanical Seal
$128.00
quality
EGG SEALOL MECHANICAL SEAL RSD 3145  RSD3145
EGG SEALOL MECHANICAL SEAL RSD 3145 RSD3145
$150.00
quality
EGG SEALOL MECHANICAL SEAL RSD 2951  RSD2951
EGG SEALOL MECHANICAL SEAL RSD 2951 RSD2951
$125.00
quality
Burgmann ISO 9001 Mechanical Seal NIB M32N 70 00 R
Burgmann ISO 9001 Mechanical Seal NIB M32N 70 00 R
$79.99
quality
EGG SEALOL MECHANICAL SEAL RSD 8026  RSD8026
EGG SEALOL MECHANICAL SEAL RSD 8026 RSD8026
$175.00
quality
JOHN CRANE MECHANICAL SEAL RSD3145  RSD3145
JOHN CRANE MECHANICAL SEAL RSD3145 RSD3145
$150.00
quality
MECHANICAL SEAL P63314  M09380  BP662 1  013099
MECHANICAL SEAL P63314 M09380 BP662 1 013099
$125.00
quality
EGG SEALOL MECHANICAL SEAL 2951
EGG SEALOL MECHANICAL SEAL 2951
$115.00
quality
EGG SEALOL MECHANICAL SEAL RSD 2835  RSD 2835
EGG SEALOL MECHANICAL SEAL RSD 2835 RSD 2835
$85.00
quality
EGG SEALOL MECHANICAL SEAL RSD 4125  RSD4125
EGG SEALOL MECHANICAL SEAL RSD 4125 RSD4125
$85.00
quality
EGG SEALOL MECHANICAL SEAL RSD3060  RSD 3060
EGG SEALOL MECHANICAL SEAL RSD3060 RSD 3060
$55.00
quality
EGG SEALOL MECHANICAL SEAL 2951
EGG SEALOL MECHANICAL SEAL 2951
$95.00
quality
EGG SEALOL MECHANICAL SEAL RSD 1330  RSD1330
EGG SEALOL MECHANICAL SEAL RSD 1330 RSD1330
$55.00
quality
Durametallic Mechanical Seals Type 8 9 with 2 seats
Durametallic Mechanical Seals Type 8 9 with 2 seats
$250.00
quality
EGG SEALOL MECHANICAL SEAL 2255
EGG SEALOL MECHANICAL SEAL 2255
$75.00
quality
Chesterton Mechanical Chemical Seal 44CE 14 RU CB S NEW
Chesterton Mechanical Chemical Seal 44CE 14 RU CB S NEW
$60.00
quality
EGG SEALOL MECHANICAL SEAL 1885
EGG SEALOL MECHANICAL SEAL 1885
$35.00
quality
AesSeal BSIV BSIVN Cartridge Mechanical Seal
AesSeal BSIV BSIVN Cartridge Mechanical Seal
$199.00
quality
EGG SEALOL MECHANICAL SEAL 1300  3 4 SHAFT
EGG SEALOL MECHANICAL SEAL 1300 3 4 SHAFT
$35.00
quality
NIB CHESTERTON MECHANICAL SEAL 442M 60 SA RSC RSC S AFLAS 169194 7500 SHAFT
NIB CHESTERTON MECHANICAL SEAL 442M 60 SA RSC RSC S AFLAS 169194 7500 SHAFT
$712.00
quality
JOHN CRANE MECHANICAL SEAL RSD 5600 SS W
JOHN CRANE MECHANICAL SEAL RSD 5600 SS W
$95.00
quality
NEW SEPCO RKPL3677A REPAIR KIT FOR PRO MECHANICAL SEAL
NEW SEPCO RKPL3677A REPAIR KIT FOR PRO MECHANICAL SEAL
$449.99
quality
BELL  GOSSETT MECHANICAL SEAL AC0634 NEW IN BOX SA0458936 001 3
BELL GOSSETT MECHANICAL SEAL AC0634 NEW IN BOX SA0458936 001 3
$49.95
quality
Robco Enviro1 Mechanical Cartridge Seal LVS 28876
Robco Enviro1 Mechanical Cartridge Seal LVS 28876
$510.77
quality
Robco R3S1024 P2SSR2 Mechanical Seal
Robco R3S1024 P2SSR2 Mechanical Seal
$108.95
quality
Robco GRR3S1024 P2SSR2 Mechanical Seal
Robco GRR3S1024 P2SSR2 Mechanical Seal
$108.95
quality
Robco R6S2030 P2SHN4 Mechanical Seal
Robco R6S2030 P2SHN4 Mechanical Seal
$158.95
quality
Robco R3S1028 P2SSC2LC Mechanical Seal
Robco R3S1028 P2SSC2LC Mechanical Seal
$158.95
quality
Robco R3S1024 N2SSN2 Mechanical Seal 1 1 2
Robco R3S1024 N2SSN2 Mechanical Seal 1 1 2
$108.95
quality
Robco R3S1028 P2SSC2LC Mechanical Seal New No Box
Robco R3S1028 P2SSC2LC Mechanical Seal New No Box
$108.95
quality
Robco R3S1032 P2SSR2 Mechanical Seal
Robco R3S1032 P2SSR2 Mechanical Seal
$158.95
quality
Robco GRT6B3 B Mechanical Seal 1 1 2
Robco GRT6B3 B Mechanical Seal 1 1 2
$108.95
quality
NEW MULTIQUIP Mechanical Seal Sleeve pn 0811883034 Fits QP40TE QP40TH Pumps
NEW MULTIQUIP Mechanical Seal Sleeve pn 0811883034 Fits QP40TE QP40TH Pumps
$9.99
quality
JOHN CRANE MECHANICAL SEAL RSD 1720  RSD1720
JOHN CRANE MECHANICAL SEAL RSD 1720 RSD1720
$35.00
quality
Advanced Sealing Tech Mechanical Seals 15197 80339 NIB
Advanced Sealing Tech Mechanical Seals 15197 80339 NIB
$300.00
quality
Flowserve X 100 Mechanical Seal 358279 JS263971 R 10 2 04 LE3C2000RZ3 4Q03 New
Flowserve X 100 Mechanical Seal 358279 JS263971 R 10 2 04 LE3C2000RZ3 4Q03 New
$300.00
quality
SEAL MECHANICAL PUMP 25 DIA SHFT SLV SPLIT STYLE 610 513 131
SEAL MECHANICAL PUMP 25 DIA SHFT SLV SPLIT STYLE 610 513 131
$735.00
quality
JOHN CRANE 1 00192 XF5010101 D 1626 034 O MECHANICAL TYPE 1 1 5 8IN SEAL B209869
JOHN CRANE 1 00192 XF5010101 D 1626 034 O MECHANICAL TYPE 1 1 5 8IN SEAL B209869
$55.00
quality
John Crane 1366517 mechanical seal RK155 11A repair kit AW155138 1
John Crane 1366517 mechanical seal RK155 11A repair kit AW155138 1
$47.00
quality
John Crane 275 mechanical seal 1410224 Type 2 FSD 3020
John Crane 275 mechanical seal 1410224 Type 2 FSD 3020
$112.00
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
$82.50
quality
Wacker Trash Pump Mechanical Seal Fits Older PT2A PT2B PT3A PT3V 0078837
Wacker Trash Pump Mechanical Seal Fits Older PT2A PT2B PT3A PT3V 0078837
$79.98
quality
ALFA LAVAL 3149205091 MECHANICAL SEAL SPRING RETAINER 2000 2100
ALFA LAVAL 3149205091 MECHANICAL SEAL SPRING RETAINER 2000 2100
$39.99
quality
FlowServe split mechanical seal 275 PSS III 2750E42EFVV PS3 413321PS3 NEW
FlowServe split mechanical seal 275 PSS III 2750E42EFVV PS3 413321PS3 NEW
$389.00
quality
FlowServe split mechanical seal 325 PSSIII3250ER2EFVV PS3 143382PS3 NEW
FlowServe split mechanical seal 325 PSSIII3250ER2EFVV PS3 143382PS3 NEW
$392.00
quality
FlowServe mechanical seal repair kit 700 RK167873 SGL INS PSS E42EFEE New
FlowServe mechanical seal repair kit 700 RK167873 SGL INS PSS E42EFEE New
$108.00
quality
JOHN CRANE C3715000025629 MECHANICAL SEAL PARTS KIT 5629 DR R AY 01500T 37FS
JOHN CRANE C3715000025629 MECHANICAL SEAL PARTS KIT 5629 DR R AY 01500T 37FS
$34.93
quality
NEW Vertifilo Mechanical Seal 1625 1 5 8 Shaft
NEW Vertifilo Mechanical Seal 1625 1 5 8 Shaft
$81.00
quality
NEW ZENITH 12 BL900 0000 0 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417549
NEW ZENITH 12 BL900 0000 0 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417549
$155.00
quality
Garlock PK Colt Industries Mechanical Seal 15 16 70005 0010
Garlock PK Colt Industries Mechanical Seal 15 16 70005 0010
$45.00
quality
FlowServe split mechanical seal 750 PSS 322701 1682624 New 8435902 MV3P7500PA3
FlowServe split mechanical seal 750 PSS 322701 1682624 New 8435902 MV3P7500PA3
$585.00
quality
NEW ZENITH 12 BM900 0000 0 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417540
NEW ZENITH 12 BM900 0000 0 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417540
$144.00
quality
1 NIB CHESTERTON 143 9 1439 MECHANICAL PUMP SEAL 289409
1 NIB CHESTERTON 143 9 1439 MECHANICAL PUMP SEAL 289409
$95.50
quality
FlowServe RK407803PS2 repair kit split mechanical seal 725 SGL PSSIIER2EFVV
FlowServe RK407803PS2 repair kit split mechanical seal 725 SGL PSSIIER2EFVV
$99.00
quality
NEW DUNHAM BUSH 21 028F 171 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417636
NEW DUNHAM BUSH 21 028F 171 MECHANICAL KIT PUMP SEAL REPLACEMENT PART B417636
$85.00
quality
AES Seal L Seal Single Mechanical Seal 1125 09
AES Seal L Seal Single Mechanical Seal 1125 09
$300.00
quality
23010 Old Stock Pierce Pump 12590 Mechanical Seal Kit 10
23010 Old Stock Pierce Pump 12590 Mechanical Seal Kit 10
$190.50
quality
Walrus Booster Pump Mechanical Seal kit for models TQ200 TQ400
Walrus Booster Pump Mechanical Seal kit for models TQ200 TQ400
$17.99
quality
New Goulds 10K27 Mechanical Seal
New Goulds 10K27 Mechanical Seal
$99.99
quality
DELTA MECHANICAL 43M RBLT PUMP SEAL
DELTA MECHANICAL 43M RBLT PUMP SEAL
$79.95
quality
Test Titan mechanical test plug 3 size Seals deeper than other plugs NEW
Test Titan mechanical test plug 3 size Seals deeper than other plugs NEW
$3.99
quality
NEW JOHN CRANE ROOL 0350 61AY FLEXIBOX RS 630 MECHANICAL PUMP SEAL B213642
NEW JOHN CRANE ROOL 0350 61AY FLEXIBOX RS 630 MECHANICAL PUMP SEAL B213642
$100.00
quality
FLOWSERVE SER 87 KM 220914 MECHANICAL DUAL CARTRIDGE SEAL APT53 4 PUMP B213867
FLOWSERVE SER 87 KM 220914 MECHANICAL DUAL CARTRIDGE SEAL APT53 4 PUMP B213867
$275.00
quality
New John Crane Mechanical Seal A 867058 P 5005
New John Crane Mechanical Seal A 867058 P 5005
$99.00
quality
6397 Berkeley Pump Repair Kit N3 5C Mechanical Seal Shaft Seals Snap Rings
6397 Berkeley Pump Repair Kit N3 5C Mechanical Seal Shaft Seals Snap Rings
$290.22
quality
FLOWSERVE XC3B3000CY3 03 359997 MECHANICAL 3IN DURA PUMP SEAL PART B331562
FLOWSERVE XC3B3000CY3 03 359997 MECHANICAL 3IN DURA PUMP SEAL PART B331562
$569.00
quality
DURAMETALLIC 975002 003 1125IN MECHANICAL PUMP SEAL REPLACEMENT PART B381902
DURAMETALLIC 975002 003 1125IN MECHANICAL PUMP SEAL REPLACEMENT PART B381902
$149.00
quality
JOHN CRANE BF501C1 PP JOINT MECHANICAL 3 4IN PUMP SEAL REPLACEMENT PART B381887
JOHN CRANE BF501C1 PP JOINT MECHANICAL 3 4IN PUMP SEAL REPLACEMENT PART B381887
$65.00
quality
Anchor Rota Face Mechanical Seals 1 1 8 0183A01 F2SSN2 NIB
Anchor Rota Face Mechanical Seals 1 1 8 0183A01 F2SSN2 NIB
$49.99
quality
John Crane 075 mechanical seal B15912 drawing  D 0751 108 F F
John Crane 075 mechanical seal B15912 drawing D 0751 108 F F
$80.00
quality
JOHN CRANE B06528 TYPE 2 3IN BF502B 015 1 18 1 MECHANICAL PUMP SEAL PART B348240
JOHN CRANE B06528 TYPE 2 3IN BF502B 015 1 18 1 MECHANICAL PUMP SEAL PART B348240
$450.00
quality
ITT Hoffman 180013 Mechanical Seal Kit
ITT Hoffman 180013 Mechanical Seal Kit
$63.75
quality
Burks Mechanical Pump Seal 08514 C P NIB
Burks Mechanical Pump Seal 08514 C P NIB
$49.99
quality
John Crane 1875 mechanical seal B698 92 drawing  CFSP94362 T1 15 3HS10
John Crane 1875 mechanical seal B698 92 drawing CFSP94362 T1 15 3HS10
$135.00
quality
NEW PPC MECHANICAL 1 3 4 1500 CARTRIDGE SEAL 316 FKM TC CARBON HC NASB
NEW PPC MECHANICAL 1 3 4 1500 CARTRIDGE SEAL 316 FKM TC CARBON HC NASB
$64.85
quality
NEW JOHN CRANE M124 16 1437 1 7 16 IN MECHANICAL PUMP SEAL PART B348274
NEW JOHN CRANE M124 16 1437 1 7 16 IN MECHANICAL PUMP SEAL PART B348274
$65.00
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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