Sterntube Seal & Components
History
SIMPLEX STERNTUBE - SEAL | ||
1948 | ||
 | ||
SIMPLEX COMPACT - SC1 |
1970 |
SIMPLEX COMPACT - SC2 |
1992 |
 |
SIMPLEX sterntube seals (stern tube seals)
Seals for oil and water lubricated sterntubes
Compact (SC1) and Compact 2000 (SC2)
Size 155 - 1250 non split version
Size 140 - 1000 split version
Conventional
No longer manufactured - but spares are available
Size 155 - 800
No longer manufactured - but spares are available
Size 155 - 800
SIMPLEX-COMPACT airspace sealing system
Airspace seal
This anti-pollution seal uses four self-supporting lip rings and incorporates an air chamber with controlled venting an no loss of air into the seawater. The system also has the ability to be switched over to a standard seal with a pressure control system in times of emergency.
As with other Simplex seals the lip rings can be replaced without uncoupling the tail shaft or removing the propeller.
This airspace seal installation diagram shows the latest standard with a pipe connection between seal and oil tank at the bottom of the seal and an additional oil chamber vent pipe connected on top of the seal. This revised design offers the opportunity to fill the oil chamber via the oil tank and vent the chamber at the same time.
SIMPLAN sterntube seals (stern tube seals)
For small shaft diameters and water lubricated sterntubes, vessels using inland water ways, coastal vessels, yachts and high speed naval or coastal protection applications.
Frequently asked questions | |
What's in the service package? | Everything that is required to change the seals including the precise alignment of the liner. |
Can the job be done afloat? | If the ship can be ballasted by the bow so that the shaft is out of the water then the seals can be bonded provided there is no other damage. |
How long will the job take? | Three days for a standard forward and aft seal on the one shaft, provided that other dry dock work does not interrupt our work. CPP installations and split liners will take longer. |
Can we replace the sealing rings without pulling the shaft? | Yes, by cutting the sealing rings, then vulcanising the rings with the aid of a bonding kit, and special two component adhesive. |
What am I likely to need to do at the next docking? | Contact Your maker. They will check their service reports and advise what spares are required. For instance, a distance ring may be required, or the liner may need to be machined or a new liner needed. |
Why are my seals leaking? | All seals require a small migration of liquid particles under the sealing ring in order to ensure that the ring is lubricated and cooled. Any water is accumulated in the Number Two chamber and transfered back to the 20 litre tank where it can be drained off. A leakage of up to 1% of the shaft diameter is acceptable. |
I have 5% oil in the sterntube oil. What should I do? | Excessive leakage may be caused by a large number of factors for example:· Excessive wear seal lips· Hard and/or cracked seals· Broken or damaged seal springs· Foreign bodies under seal lips (fishing line, sand etc)· Damage to seal housing· Seal liners excessively grooved· Pitting corrosion in liners· Damaged gasket or 'O' seal on liner (aft seal)· Damaged 'O' seal between liner and clamp ring (forward seal)· Excessive eccentricity on liners· Wrong oil in system (possible corrosive effect on seals)· Liners machined under minimum permissable size· Excessive clearance between sterntube bearings and propeller shaft. (Vibration can cause pumping effect of oil or water past seals)· Damaged housing gasket |
The process in pictures
 |  |
| 1. cutting away the old seal | 2. cutting the ring |
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3. bonding the ring | 4. the finished ring |
(information taken from www.sterntubeseals.com)
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