Mechanical Seal

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GOULDS PUMPS VI Mechanical Seal Pump Repair Parts Kit 10K25 NOS
GOULDS PUMPS VI Mechanical Seal Pump Repair Parts Kit 10K25 NOS
$19.99
quality
Flowserve Mechanical Seal Repair Kit 11 REP KIT PSS II 2000 RK143256PS2
Flowserve Mechanical Seal Repair Kit 11 REP KIT PSS II 2000 RK143256PS2
$33.00
quality
NEW PPC AS 425 1 14 1200S 4 1 4 IN MECHANICAL PUMP SEAL REPAIR KIT D542654
NEW PPC AS 425 1 14 1200S 4 1 4 IN MECHANICAL PUMP SEAL REPAIR KIT D542654
$163.28
quality
NEW PPC AS 175 2 11 1200S 1 3 4 IN MECHANICAL PUMP SEAL REPAIR KIT D542657
NEW PPC AS 175 2 11 1200S 1 3 4 IN MECHANICAL PUMP SEAL REPAIR KIT D542657
$145.28
quality
NEW PPC AS 200 1 14 1200S 2 IN MECHANICAL PUMP SEAL REPAIR KIT D542662
NEW PPC AS 200 1 14 1200S 2 IN MECHANICAL PUMP SEAL REPAIR KIT D542662
$145.28
quality
NEW PPC R1 325 4 AS 1200S 3 1 4 IN MECHANICAL PUMP SEAL REPAIR KIT D542655
NEW PPC R1 325 4 AS 1200S 3 1 4 IN MECHANICAL PUMP SEAL REPAIR KIT D542655
$145.28
quality
NEW SURPLUS FLOWSERVE 1875 BIG BORE DOUBLE MECHANICAL SEAL 316SS TC CA SC SC
NEW SURPLUS FLOWSERVE 1875 BIG BORE DOUBLE MECHANICAL SEAL 316SS TC CA SC SC
$2,500.00
quality
NEW FLOWSERVE A2R64138 04 MECHANICAL PUMP SEAL BC W BASIC QBRW55005X4U D542670
NEW FLOWSERVE A2R64138 04 MECHANICAL PUMP SEAL BC W BASIC QBRW55005X4U D542670
$54.33
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MECO Mechanical Seal Repair Kit EAS 444SIKS RG NIB
MECO Mechanical Seal Repair Kit EAS 444SIKS RG NIB
$25.00
quality
John Crane M201203 Mechanical Seal Type 5615 1125
John Crane M201203 Mechanical Seal Type 5615 1125
$127.50
quality
APV Mechanical Pump Seal 10HP296696 3 3 4 New Surplus
APV Mechanical Pump Seal 10HP296696 3 3 4 New Surplus
$120.00
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JOHN CRANE 3 3 4 MECHANICAL PUMP SEAL ASSEMBLY 2F 8C NIB
JOHN CRANE 3 3 4 MECHANICAL PUMP SEAL ASSEMBLY 2F 8C NIB
$44.99
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DURA SEAL 8 MECHANICAL SEAL GEA1319513A
DURA SEAL 8 MECHANICAL SEAL GEA1319513A
$95.95
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FlowServe Mechanical Seal 137216 BASE 3 3 8 New Surplus
FlowServe Mechanical Seal 137216 BASE 3 3 8 New Surplus
$100.00
quality
FlowServe Pac Seal Mechanical Seal DD 020 948 New Surplus
FlowServe Pac Seal Mechanical Seal DD 020 948 New Surplus
$20.00
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flowserve pump Replacement Mechanical Seal 154811GE
flowserve pump Replacement Mechanical Seal 154811GE
$500.00
quality
DURAMETALLIC DURA SEAL MECHANICAL SEAL KU3R1750333 COMPLETE SEAL UNIT
DURAMETALLIC DURA SEAL MECHANICAL SEAL KU3R1750333 COMPLETE SEAL UNIT
$125.00
quality
FlowServe Mechanical Seal 147295 New Surplus
FlowServe Mechanical Seal 147295 New Surplus
$75.00
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John Crane 20 mechanical seal 832147 016 Type 8b 2BL B184 82 H88543
John Crane 20 mechanical seal 832147 016 Type 8b 2BL B184 82 H88543
$115.00
quality
John Crane 1125 CFD1197 2B BF50 mechanical seal B71862 Type 21
John Crane 1125 CFD1197 2B BF50 mechanical seal B71862 Type 21
$97.50
quality
John Crane Mechanical Double Seal Model 4620P Size 1375
John Crane Mechanical Double Seal Model 4620P Size 1375
$395.00
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John Crane 0562 Mechanical Seal B414 48 drawing CFD1143 Type 6
John Crane 0562 Mechanical Seal B414 48 drawing CFD1143 Type 6
$92.50
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John Crane Type 5611 Mechanical Elastomer Bellows Pump Seal 2625 C11331
John Crane Type 5611 Mechanical Elastomer Bellows Pump Seal 2625 C11331
$395.00
quality
Chesterton 770 Mechanical Seal 46208 Rebuilt
Chesterton 770 Mechanical Seal 46208 Rebuilt
$35.00
quality
Chesterton 770 Mechanical Seal 10E1W E1Z NEW Surplus
Chesterton 770 Mechanical Seal 10E1W E1Z NEW Surplus
$35.00
quality
Chesterton 770 Mechanical Seal 12E1W E1Z NEW Surplus
Chesterton 770 Mechanical Seal 12E1W E1Z NEW Surplus
$35.00
quality
Chesterton 770 Mechanical Seal 46240 NEW Surplus
Chesterton 770 Mechanical Seal 46240 NEW Surplus
$35.00
quality
Chesterton 770 Mechanical Seal 43412 NEW Surplus
Chesterton 770 Mechanical Seal 43412 NEW Surplus
$35.00
quality
Chesterton 770 Mechanical Seal 46208 NEW Surplus
Chesterton 770 Mechanical Seal 46208 NEW Surplus
$35.00
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Chesterton 770 Mechanical Seal 46222 Rebuilt
Chesterton 770 Mechanical Seal 46222 Rebuilt
$35.00
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Chesterton 770 Mechanical Seal 43414 NEW Surplus
Chesterton 770 Mechanical Seal 43414 NEW Surplus
$35.00
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Chesterton 880 Mechanical Seal 54143 Rebuilt
Chesterton 880 Mechanical Seal 54143 Rebuilt
$45.00
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Chesterton 880 Mechanical Seal 54138 Rebuilt
Chesterton 880 Mechanical Seal 54138 Rebuilt
$45.00
quality
Chesterton 880 Mechanical Seal 054109 Rebuilt
Chesterton 880 Mechanical Seal 054109 Rebuilt
$40.00
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Chesterton 880 Mechanical Seal 54221 NEW Surplus
Chesterton 880 Mechanical Seal 54221 NEW Surplus
$75.00
quality
Five Star Seal 3 Single Cartridge Mechanical Seal 19401 NEW Surplus
Five Star Seal 3 Single Cartridge Mechanical Seal 19401 NEW Surplus
$500.00
quality
Dayton Mechanical Shaft Seal Models 1R2981R3011R3041R3051R307
Dayton Mechanical Shaft Seal Models 1R2981R3011R3041R3051R307
$27.50
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5 MECHANICAL SPLIT DURA SEAL 3750 PSS
5 MECHANICAL SPLIT DURA SEAL 3750 PSS
$274.99
quality
FLOWSERVE SPLIT MECHANICAL SEAL MV738916615
FLOWSERVE SPLIT MECHANICAL SEAL MV738916615
$49.99
quality
JOHN CRANE STAINLESS MECHANICAL SEAL 1221855D PN M123093 ASSEMBLY 2375 NIB
JOHN CRANE STAINLESS MECHANICAL SEAL 1221855D PN M123093 ASSEMBLY 2375 NIB
$50.00
quality
Blackmer Mechanical Seal Assembly  P N 332050 040
Blackmer Mechanical Seal Assembly P N 332050 040
$199.00
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O Ring Seal Gasket Kit Large Assortment Mechanics Set Sizes 006 327
O Ring Seal Gasket Kit Large Assortment Mechanics Set Sizes 006 327
$20.99
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BURGMANN Mechanical Seal MG12 43 G60
BURGMANN Mechanical Seal MG12 43 G60
$59.95
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FlowServe Mechanical Seal P02886 00 New Surplus
FlowServe Mechanical Seal P02886 00 New Surplus
$35.00
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Chesterton 880 Mechanical Seal 880 16 new factory inventory
Chesterton 880 Mechanical Seal 880 16 new factory inventory
$20.00
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KSB Mechanical Seal KVO43S1 TYP4A New Surplus
KSB Mechanical Seal KVO43S1 TYP4A New Surplus
$100.00
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John Crane Type 21 Mechanical Seal 172 250 048 1 Size 1 2 New Surplus
John Crane Type 21 Mechanical Seal 172 250 048 1 Size 1 2 New Surplus
$50.00
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John Crane Mechanical Seal M105006 Type 21 1125 New Surplus
John Crane Mechanical Seal M105006 Type 21 1125 New Surplus
$40.00
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John Crane Mechanical Seal Pump Shaft Coupling BR0OL 0350 61AY 0000 New Surplus
John Crane Mechanical Seal Pump Shaft Coupling BR0OL 0350 61AY 0000 New Surplus
$50.00
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NEW Utex 1200 03 0090 01 Unitized Valve Packing Mechanical Pump Cartridge Seal
NEW Utex 1200 03 0090 01 Unitized Valve Packing Mechanical Pump Cartridge Seal
$49.99
quality
Mechanical pump Seal Assembly
Mechanical pump Seal Assembly
$229.00
quality
1 NEW GARLOCK PK70068 0007 MECHANICAL SEAL MAKE OFFER
1 NEW GARLOCK PK70068 0007 MECHANICAL SEAL MAKE OFFER
$23.87
quality
A C Compressor Corp 16 242 085 508 Mechanical Seal 2 5 8
A C Compressor Corp 16 242 085 508 Mechanical Seal 2 5 8
$999.00
quality
Chesterton 880 Mechanical Seal 54110 Rebuilt
Chesterton 880 Mechanical Seal 54110 Rebuilt
$25.00
quality
Chesterton 880 Mechanical Seal 53120 Seal Only NEW Surplus
Chesterton 880 Mechanical Seal 53120 Seal Only NEW Surplus
$25.00
quality
Chesterton 880 Mechanical Seal 54105 Rebuilt
Chesterton 880 Mechanical Seal 54105 Rebuilt
$20.00
quality
Chesterton 880 Mechanical Seal 53104 Rebuilt
Chesterton 880 Mechanical Seal 53104 Rebuilt
$20.00
quality
Chesterton 880 Mechanical Seal 53104 NEW Surplus
Chesterton 880 Mechanical Seal 53104 NEW Surplus
$25.00
quality
Chesterton 880 Mechanical Seal 53113 NEW Surplus
Chesterton 880 Mechanical Seal 53113 NEW Surplus
$25.00
quality
type 21carbon ceramic buna mechanical seal
type 21carbon ceramic buna mechanical seal
$11.70
quality
Flowserve A3R2976 12 Mechanical Seal for Booster Pump
Flowserve A3R2976 12 Mechanical Seal for Booster Pump
$1,920.00
quality
New Surplus Goulds 3196 MTi 2x3 10 Pump Ductile Iron w mechanical seal
New Surplus Goulds 3196 MTi 2x3 10 Pump Ductile Iron w mechanical seal
$2,950.00
quality
Mechanical Shaft Seal Type 21 Flowserve New
Mechanical Shaft Seal Type 21 Flowserve New
$17.10
quality
T316 316L FLANGED MECHANICAL SEAL 32861 914809
T316 316L FLANGED MECHANICAL SEAL 32861 914809
$299.99
quality
MECHANICAL SEAL 9477436 13
MECHANICAL SEAL 9477436 13
$199.99
quality
FLYGT MECHANICAL SEAL 4660 MIXER SEAL PART  6196430 NEW
FLYGT MECHANICAL SEAL 4660 MIXER SEAL PART 6196430 NEW
$247.97
quality
uxcell 50 Pcs 5mm x 1mm x 3mm Mechanical Black NBR O Rings Oil Seal Washers
uxcell 50 Pcs 5mm x 1mm x 3mm Mechanical Black NBR O Rings Oil Seal Washers
$8.53
quality
Goulds 10K10 Mechanical Seal 100SE
Goulds 10K10 Mechanical Seal 100SE
$12.60
quality
Goulds 10K2 Mechanical Seal
Goulds 10K2 Mechanical Seal
$13.70
quality
Goulds 10K27 Mechanical Seal
Goulds 10K27 Mechanical Seal
$106.20
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Mechanical Seal
Mechanical Seal
$350.00
quality
Mechanical Seal
Mechanical Seal
$326.60
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FLOWSERVE MECHANICAL PUMP SEAL 5616 REV 4
FLOWSERVE MECHANICAL PUMP SEAL 5616 REV 4
$74.99
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Goulds 10K64 Mechanical Seal
Goulds 10K64 Mechanical Seal
$111.00
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Mechanical Seal
Mechanical Seal
$282.00
quality
NEW FLOWSERVE 979389 001 Q1 MECHANICAL STAINLESS PUMP SEAL D523575
NEW FLOWSERVE 979389 001 Q1 MECHANICAL STAINLESS PUMP SEAL D523575
$345.43
quality
John Crane Type 2 Mechanical Seal 1 M03822 Size 125 New Surplus
John Crane Type 2 Mechanical Seal 1 M03822 Size 125 New Surplus
$20.00
quality
NEW SEPCO RKPL3677A REPAIR KIT FOR PRO MECHANICAL SEAL
NEW SEPCO RKPL3677A REPAIR KIT FOR PRO MECHANICAL SEAL
$359.99
quality
4 PCS 28mm External Diameter 4mm Thick Mechanical Rubber Oring Seal
4 PCS 28mm External Diameter 4mm Thick Mechanical Rubber Oring Seal
$3.00
quality
EGG Sealol Mechanical Seal Shaft 2 5 8
EGG Sealol Mechanical Seal Shaft 2 5 8
$27.62
quality
Crane Dening 0030885 1 1 4 Mechanical Seal
Crane Dening 0030885 1 1 4 Mechanical Seal
$49.25
quality
Super Pro 5 8 Pump Mechanical Seal 200 354545 SPX 1250X Z 2 92500150 A 8 NEW
Super Pro 5 8 Pump Mechanical Seal 200 354545 SPX 1250X Z 2 92500150 A 8 NEW
$12.50
quality
Worthington Mechanical Seal Type 1 BF0271 26457
Worthington Mechanical Seal Type 1 BF0271 26457
$35.00
quality
Worthington Mechanical Seal Type 1 BR271 26457
Worthington Mechanical Seal Type 1 BR271 26457
$35.00
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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