GeorgeCoy
Joined: 02 Dec 2010
Posts: 310
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 Posted: Mon Sep 28, 2015 5:25 am Post subject: Compressor Couplings |
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Some information on air compressor shear couplings:
The original shear pins are made from 12Cr18Ni10T (Russian alloy). It is a stainless steel similar with 321 (USA alloy). During the manufacturing process a coupling from each batch is shear tested. The shear torque has to be 15 Kgf-m (108 lbf-ft) for couplings with pins with 3 millimeters on diameter (first serial engines) and 22Kgf-m (159 lbf-ft) for couplings with pins with 3.5 millimeters on diameter (second serial engines).
We strongly recommend using pins from the genuine steel or equivalents according to STAHLSLUSSEL catalogue.
If during start or shut down, the engine runs for few revolutions backward then important dynamic stress occurs and it is possible shearing the pins (the purpose of this shear coupling is to protect the engine gears). If the start and the shutdown of the engine are normal then the main cause is the too high temperature of the cylinder of the compressor during the flight or the too high temperature of the oil (the compressor is lubricated under pressure from the oil system of the engine). It is necessary to check the cooling system of the compressor and the cooling system of the oil. It is recommended also to replace with a new one the fabric air filter of the air compressor.
George Coy
CAS Ltd.
629 Airport Rd.
Swanton VT 05488 USA
802-868-5633 off
802-363-5782 cell
802-868-6632 Fax
george.coy(at)gmail.com (george.coy(at)gmail.com)
http://coyacft.com/
SKYPE george.coy
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