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| Item | Designation |
|---|---|
| 1 | Seal face |
| 5 | Seat |
| 13 | Sleeve |
| 16 | Housing |
| 18 | Pin |
| 37 | Locking fixture |
| 2, 12, 15, 22, 23, 24, 25 | O-Ring |
| 43 | Plug |
LP-D-UP Dual seal
Ready-fitted for Ahlstar UP A MS21 range of pumps, bearing unit A1-A6
LP-D
Features
- Integrated seal for Sulzer A pumps
- Dual seal, balanced
- Semi cartridge unit
- Independent of direction of rotation
- Double pressure balanced
- Internal barrier fluid circulation
- Static springs on both sides
- No dynamic O-Ring on shaft
- Rugged design
- Shrink-fitted seal faces
- Seal faces have a large clearance to the shaft
- Wear part cost minimized
- Optimized design for Non-Flow use
Advantages
- Individually integrated to equipment for the best sealing result
- Straightforward and easy installation
- Static springs on both face sides reduces influence of misalignment
- No damage of the shaft by dynamically loaded O-Rings
- Extended service life due to rugged design
- No brittle parts in contact with torque transmission pins
- Seal faces protected by strong steel parts and a large radial clearance
Operating range
Temperature:
t = -20 °C ... +140 °C (-4 °F ... +284 °F)
(180 °C (356 °F) with Kalrez® elastomers)
Pressure:
p1 ... 25 bar (363 PSI), p3 <12 bar (174 PSI)
Sliding velocity: vg ... 20 m/s (66 ft/s)
Stock content: <8 %
Non-flow operation:
Temperature:
t = +5 °C ... +100 °C (+41 °F ... +212 °F)
Pressure:
p1 max. 10 bar (145 PSI), p3 > p1
Sliding velocity: vg <10 m/s (33 ft/s)
Materials
Seal face: Silicon carbide (Q12), Carbon (A)
Secondary seals: FKM (V), EPDM (E), FFKM (K)
Metal parts: CrNiMo steel (G),
Grade 5A (4T), SMO 654 (4U)
Recommended applications
- Clean, abrasive or corrosive liquids
- Stocks of various kind
- Applications where crystallization is a problem
- Pulp and paper industry
- Chemical industry
- CCUS
- Lithium
- Alternative fuels production
- Sulzer Ahlstar A (MS11) centrifugal pumps
Notes
- Double, quench and single seals have the same wear parts on the prouduct side, reduces stock holding costs
- The dual seal can also be used as single seal by removing the atmospheric seal parts
- Can be used with pressurized buffer fluid or with quench
Product variants
LP-D-S32-D20
Dual seal, adapted for Sulzer APP/APT pumps.
LP-D-SL
Dual, adapted for Sulzer SL Mixers.
Further designs
available to fit in numerous other equipment from notable manufacturers for the Pulp- and Paper Industry e.g., Metso conical refiners, Andritz pressure screens and stock pumps.
