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Stern Sheave

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Manufacturer
Smith Berger Marine Inc.
Seattle, WA
http://www.smithberger.com/

Specifications
  • SWL = 'the sheave is designed to withstand the 355,000 pound breaking strength of the Plasma rope with a 90 degree wrap angle with a safety factor of 1.5 as defined in 46CFR-189-35.
  • Instrumented for load, rope speed and length out.
  • 65" OD X 60" root diameter Nylatron sheave ring grooved for 2" Plasma. The Nylatron sheave is bolted to a steel hub and is supported by a 7" diameter 17-4 PH stainless load pin.
  • The stern sheave is located in the center of the transom of the Knorr and sits on a heavily reinforced foundation built up from the main girder of the vessel. When the coring load is transferred to the stern sheave, it is offset by the vessels displacement in a way that there is no compromise to stability or structure. Structural load limit when rigged this way = 300 tons.


Stern sheave casette awaiting fitting and installation onboard Knorr.  Nylatron sheave insert, foundation pins and instrumentation are visible on the right.
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Stern sheave casette

Stern sheave casette awaiting fitting and installation onboard Knorr. Nylatron sheave insert, foundation pins and instrumentation are visible on the right.



Rope alignment plates are clearly visible in this view of the stern sheave as it is hoisted into place in the stern of the Knorr.
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Rope alignment plates

Rope alignment plates are clearly visible in this view of the stern sheave as it is hoisted into place in the stern of the Knorr.



Stern sheave ?fully loaded? bearing the entire weight of the coring operation during seatrials.
Enlarge image

Stern sheave ?fully loaded? bearing the entire weight of the coring operation during seatrials.

Stern sheave ?fully loaded?

Stern sheave ‘fully loaded’ bearing the entire weight of the coring operation during seatrials.




Last updated: May 7, 2008
 


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