Mechanical Seal

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Garlock Mechanical seal 1 1 8 70398 0013
Garlock Mechanical seal 1 1 8 70398 0013
$50.00
quality
Garlock PK Mechanical seal 1 1 8 70068 0013
Garlock PK Mechanical seal 1 1 8 70068 0013
$50.00
quality
Flowserve 261856DB Seal Flange 20FC1631044 Mechanical Seal F899
Flowserve 261856DB Seal Flange 20FC1631044 Mechanical Seal F899
$195.00
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 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
John Crane 0875 mechanical seal Type 2 B15504 B52536 Drawing  FSP 15004
John Crane 0875 mechanical seal Type 2 B15504 B52536 Drawing FSP 15004
$85.00
quality
NEW EGG Sealol RSD 1590 Mechanical Seal Kit PU002026 FREE SHIPPING
NEW EGG Sealol RSD 1590 Mechanical Seal Kit PU002026 FREE SHIPPING
$29.99
quality
NEW Mechanical Shaft Seal Type 21 FREE SHIPPING
NEW Mechanical Shaft Seal Type 21 FREE SHIPPING
$17.99
quality
OCHSNER PUMP MECHANICAL SEAL A28 CNY 65 200
OCHSNER PUMP MECHANICAL SEAL A28 CNY 65 200
$100.00
quality
Banjo 18435 Mechanical Seal
Banjo 18435 Mechanical Seal
$574.67
quality
AST 80 275 SHAFT SIZE DOUBLE SEAL MECHANICAL SEAL
AST 80 275 SHAFT SIZE DOUBLE SEAL MECHANICAL SEAL
$599.00
quality
EGG SEALOL 2090 MECHANICAL SEAL  NOS
EGG SEALOL 2090 MECHANICAL SEAL NOS
$45.00
quality
EGG SEALOL 1121 MECHANICAL SEAL RSD 1121  NOS
EGG SEALOL 1121 MECHANICAL SEAL RSD 1121 NOS
$25.00
quality
EGG SEALOL 2010 MECHANICAL SEAL  NOS
EGG SEALOL 2010 MECHANICAL SEAL NOS
$35.00
quality
EGG SEALOL 1905 MECHANICAL SEAL  NOS
EGG SEALOL 1905 MECHANICAL SEAL NOS
$35.00
quality
EGG SEALOL 1421 MECHANICAL SEAL  NOS
EGG SEALOL 1421 MECHANICAL SEAL NOS
$35.00
quality
EGG SEALOL RSD 44214 MECHANICAL SEAL  NOS
EGG SEALOL RSD 44214 MECHANICAL SEAL NOS
$35.00
quality
JOHN CRANE RSD1905 MECHANICAL SEAL  NOS
JOHN CRANE RSD1905 MECHANICAL SEAL NOS
$75.00
quality
JOHN CRANE MECHANICAL SEAL  SEAL SIZE 787 TYPE 2  NOS
JOHN CRANE MECHANICAL SEAL SEAL SIZE 787 TYPE 2 NOS
$75.00
quality
EGG 1300 MECHANICAL SEAL  NOS
EGG 1300 MECHANICAL SEAL NOS
$35.00
quality
EGG 1310 MECHANICAL SEAL  NOS
EGG 1310 MECHANICAL SEAL NOS
$25.00
quality
EGG 7000 MECHANICAL SEAL  NOS
EGG 7000 MECHANICAL SEAL NOS
$25.00
quality
EGG SEALOL 1720 MECHANICAL SEAL  NOS
EGG SEALOL 1720 MECHANICAL SEAL NOS
$25.00
quality
EGG SEALOL 5080 MECHANICAL SEAL  NOS
EGG SEALOL 5080 MECHANICAL SEAL NOS
$25.00
quality
PAC SEAL S 951V MECHANICAL SEAL  NOS
PAC SEAL S 951V MECHANICAL SEAL NOS
$75.00
quality
ROTARY SYSTEMS 10053 3101 234 MECHANICAL SEAL ROTATING UNION NEW
ROTARY SYSTEMS 10053 3101 234 MECHANICAL SEAL ROTATING UNION NEW
$395.96
quality
NEW ASI 585 1 Mechanical Pump Seal 1 3 4 316 Stainless Steel Hastelloy C NEW
NEW ASI 585 1 Mechanical Pump Seal 1 3 4 316 Stainless Steel Hastelloy C NEW
$299.99
quality
Flowserve Mechanical Pump Seal 28736 2R58146DB A RO856710 Stainless Steel
Flowserve Mechanical Pump Seal 28736 2R58146DB A RO856710 Stainless Steel
$199.00
quality
NEW OLD STOCK JOHN CRANE MECHANICAL SEAL ASSEMBLY M 549SK376C JC7250
NEW OLD STOCK JOHN CRANE MECHANICAL SEAL ASSEMBLY M 549SK376C JC7250
$79.95
quality
FLOWSERVE CRANE MECHANICAL SEAL3171024 SIZE1125 TYPECBR NIB
FLOWSERVE CRANE MECHANICAL SEAL3171024 SIZE1125 TYPECBR NIB
$100.00
quality
Power Packing H 326 Mechanical Seal 1647 H1 C 20
Power Packing H 326 Mechanical Seal 1647 H1 C 20
$99.00
quality
Flygt 3377701 Mechanical Seal
Flygt 3377701 Mechanical Seal
$199.00
quality
John Crane 20 mechanical seal B 52 T1 16
John Crane 20 mechanical seal B 52 T1 16
$60.00
quality
NEW JOHN CRANE 770887 2125 TYPE 8B 1TH MECHANICAL PUMP SEAL KIT D528995
NEW JOHN CRANE 770887 2125 TYPE 8B 1TH MECHANICAL PUMP SEAL KIT D528995
$217.28
quality
NEW FLOWSERVE 614464GE F STAT FACE U1437 MECHANICAL PUMP SEAL KIT D545292
NEW FLOWSERVE 614464GE F STAT FACE U1437 MECHANICAL PUMP SEAL KIT D545292
$52.13
quality
John Crane 30 mechanical seal split mating ring A37 3000 001 9237
John Crane 30 mechanical seal split mating ring A37 3000 001 9237
$37.00
quality
John Crane 30 mechanical seal split mating ring A37 3000 001 1933
John Crane 30 mechanical seal split mating ring A37 3000 001 1933
$34.00
quality
Flowsorce Type21 Mechanical Shift Seal
Flowsorce Type21 Mechanical Shift Seal
$7.50
quality
NEW 2 Diaphragm PUMP SEAL MECHANISM ACW 002 2693599 PS 332 532 J4
NEW 2 Diaphragm PUMP SEAL MECHANISM ACW 002 2693599 PS 332 532 J4
$20.00
quality
John Crane B223 66 Mechanical Seal Type 8B1 Size 2750
John Crane B223 66 Mechanical Seal Type 8B1 Size 2750
$429.00
quality
John Crane M108374 Mechanical Seal Type 8B1 Size 3375 Dwg CFSP 20151
John Crane M108374 Mechanical Seal Type 8B1 Size 3375 Dwg CFSP 20151
$449.00
quality
John Crane B982 17 Type 2 Mechanical Seal Drawing FSP14113 Size 2250
John Crane B982 17 Type 2 Mechanical Seal Drawing FSP14113 Size 2250
$199.00
quality
Ingersoll Rand 387M516CX1 Mechanical Gland Seal A7695
Ingersoll Rand 387M516CX1 Mechanical Gland Seal A7695
$999.00
quality
New 5pcs 635mm x 56mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 635mm x 56mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$6.00
quality
New 5pcs 578mm x 507mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 578mm x 507mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$6.00
quality
New 5pcs 472mm x 416mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 472mm x 416mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$6.00
quality
New 5pcs 383mm x 316mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 383mm x 316mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$6.00
quality
New 5pcs 333mm x 263mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 333mm x 263mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$6.00
quality
Euchner Mechanical Seal Actuator Safety Switch 24285 NEW Surplus
Euchner Mechanical Seal Actuator Safety Switch 24285 NEW Surplus
$17.00
quality
Chesterton Chemical Mechanical Seal 44CE 14 RU CB S NEW Surplus
Chesterton Chemical Mechanical Seal 44CE 14 RU CB S NEW Surplus
$54.00
quality
Durametallic Mechanical Seal with 2 Seats Type 8 9 NEW Surplus
Durametallic Mechanical Seal with 2 Seats Type 8 9 NEW Surplus
$213.00
quality
New 5pcs 364mm x 292mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 364mm x 292mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$6.00
quality
New 5pcs 335mm x 26mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 335mm x 26mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$6.00
quality
New 5pcs 72mm x 65mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 72mm x 65mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$6.00
quality
New 5pcs 507mm x 435mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 507mm x 435mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$6.00
quality
New 5pcs 159mm x 88mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 159mm x 88mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$6.00
quality
9 16 Inner Dia 5625 SHAFT Water Pump Mechanical Seal TRANSFER OIL WATER
9 16 Inner Dia 5625 SHAFT Water Pump Mechanical Seal TRANSFER OIL WATER
$0.99
quality
New 1pc 250mm x 246mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 1pc 250mm x 246mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$10.00
quality
John Crane 175 mechanical seal primary ring D17513139205
John Crane 175 mechanical seal primary ring D17513139205
$28.00
quality
John Crane 175 mechanical seal collar D17510960550
John Crane 175 mechanical seal collar D17510960550
$30.00
quality
New 5pcs 1023mm x 958mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 1023mm x 958mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$8.00
quality
New 5pcs 122mm x 118mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 5pcs 122mm x 118mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$8.00
quality
New 5pcs 1187mm x 1138mm x 34mm Rubber O Rings Oil Mechanical Industrial Seal
New 5pcs 1187mm x 1138mm x 34mm Rubber O Rings Oil Mechanical Industrial Seal
$8.00
quality
New 5pcs 111mm x 105mm x 34mm Rubber O Rings Oil Mechanical Industrial Seal
New 5pcs 111mm x 105mm x 34mm Rubber O Rings Oil Mechanical Industrial Seal
$8.00
quality
AMPCO 1625 Mechanical Seal Kit GS8105530 NEW Surplus
AMPCO 1625 Mechanical Seal Kit GS8105530 NEW Surplus
$260.00
quality
New 5pcs 1098mm x 1038mm x 34mm Rubber O Rings Oil Mechanical Industrial Seal
New 5pcs 1098mm x 1038mm x 34mm Rubber O Rings Oil Mechanical Industrial Seal
$8.00
quality
New 1pc 1451mm x 142mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 1pc 1451mm x 142mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$8.00
quality
New 1pc 1539mm x 151mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 1pc 1539mm x 151mm x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$8.00
quality
New 1pc 245mm od x 34mm Rubber O Rings Oil Mechanical Industrial Seals
New 1pc 245mm od x 34mm Rubber O Rings Oil Mechanical Industrial Seals
$10.00
quality
EKATO ESD34G 140 MECHANICAL SEAL TYPE ESD34 DG 140 C 2 X V WX
EKATO ESD34G 140 MECHANICAL SEAL TYPE ESD34 DG 140 C 2 X V WX
$2,499.00
quality
John Crane 062 mechanical seal B41448 B57  0666735
John Crane 062 mechanical seal B41448 B57 0666735
$39.00
quality
Garlock 70005 0027 Mechanical Seal NEW CB2
Garlock 70005 0027 Mechanical Seal NEW CB2
$60.00
quality
New John Crane Mechanical Seal Collar D26257290550 1532 Free Shipping
New John Crane Mechanical Seal Collar D26257290550 1532 Free Shipping
$34.99
quality
Mechanical seal Goulds P N 90891 0001 Dura Seal Durametallic
Mechanical seal Goulds P N 90891 0001 Dura Seal Durametallic
$138.00
quality
CHESTERTON Stationary Seat for 880 Mechanical Seal 15
CHESTERTON Stationary Seat for 880 Mechanical Seal 15
$14.99
quality
23010 Old Stock Pierce Pump 12590 Mechanical Seal Kit 10
23010 Old Stock Pierce Pump 12590 Mechanical Seal Kit 10
$118.63
quality
Viking Pump Mechanical Seal Assembly 2 473 003 999
Viking Pump Mechanical Seal Assembly 2 473 003 999
$39.00
quality
AESSEAL CDSA CARTRIDGE MECHANICAL SEAL 620641 ADTTTC35AV01 USK183152 1 NIC
AESSEAL CDSA CARTRIDGE MECHANICAL SEAL 620641 ADTTTC35AV01 USK183152 1 NIC
$100.00
quality
NEW BELL  GOSSETT 186574 REPLACEMENT MECHANICAL SEAL 2
NEW BELL GOSSETT 186574 REPLACEMENT MECHANICAL SEAL 2
$299.99
quality
FlowServe mechanical seal collar LE3M2125333 3 316 SS COL
FlowServe mechanical seal collar LE3M2125333 3 316 SS COL
$40.00
quality
New Goulds 10K13 Mechanical Seal
New Goulds 10K13 Mechanical Seal
$60.00
quality
Durametallic KEMA2125P33 Tungsten Carbide Mechanical Seal Ring
Durametallic KEMA2125P33 Tungsten Carbide Mechanical Seal Ring
$38.30
quality
NEW SURPLUS FLOWSERVE 3375 SINGLE STANDARD MECHANICAL SEAL IN 316SS
NEW SURPLUS FLOWSERVE 3375 SINGLE STANDARD MECHANICAL SEAL IN 316SS
$2,000.00
quality
NASH SC2 2 VACUUM PUMP IN 316SS WITH MECHANICAL SEALS 160 CFM 27 Hg
NASH SC2 2 VACUUM PUMP IN 316SS WITH MECHANICAL SEALS 160 CFM 27 Hg
$7,350.00
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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