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AS-LEK777: Burgmann LEK777 replacement

Description:
AS-LEK777: Replacement of Burgmann LEK777 mechanical seal cartridge mechanical seal

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AS-LEK777: Burgmann LEK777 cartridge mechanical seal
Features
Equivalent to Burgmann LEK777
Single seal
Balanced
Cartridge unit
Stationary multiple springs
Solid seal faces
Operating range
Pressure (product seal): p = vacuum ... 60 bar ( … 870 PSI)
Temperature: -40 °C … +176 °C (-40 °F … +349 °F)*
Sliding velocity: vg = 50 m/s (164 ft/s)
Viscosity: ... 300 mPa·s
Solids content: ... 0.5 wt.%
* Engineered up to 260 °C (500 °F) with FFKM (K) secondary seals
Materials
Seal ring: Blister resistant carbon, Silicon carbide SSiC (Q1), RBSiC (Q2)
Mating ring: Silicon carbide SSiC (Q1), RBSiC (Q2)
Secondary seals: FKM (V), FFKM (K), EPDM (E), NBR (P)
Springs: Hastelloy® C-276 (M5)
Metal parts: CrNiMo steel 316 (G)
Recommended applications
Oil and gas industry
Power plant technology
Light volatile hydrocarbons
LPG plants
API 610 / ISO 13709 pumps
Process pumps
Recommended piping plans
Process side: 01, 02, 11, 12, 13, 14, 21, 22, 23, 31, 32, 41
Atmospheric side: 51, 61, 62, 65A, 65B, 66A, 66B
Advantages
Suitable for higher speeds
Good followability due to no influence from run-out, squareness or vibration of the shaft
Compact design
Low heat generation and power consumption due to narrow seal face width
Longer seal life
Pressure-balanced design prevents mating ring being forced out under reverse pressure
No damage to shaft sleeve as dynamic
O-Ring is not in direct contact with the sleeve

AS-LEK777 Dimentions(mm)
API/d1 API/d2 API/d3 d4 d5 l1 l2 l3 l4
20 70 105 51 128 100 70 30 50
30 80 115 63 138 102 70 32 50
40 90 125 74 148 105 70 35 50
50 100 140 84 168 105 70 35 50
60 120 160 99 188 107 72 35 52
70 130 170 108 198 107 72 35 52
80 140 180 120 208 107 72 35 52
90 160 205 138 238 114 79 35 59
100 170 215 148 248 115 80 35 60
110 180 225 157 258 120 80 40 60

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