Hi James,
I enquired as to the price, & part of the reply is below.
Maybe Carsten's hot water bottle isn't such a bad option!
Here is a link to Silvercrest that has an oil compensation system (about 1/8th of the way down a very long page).
3/4 of the way down is some information on oil compensation & motor failure.
Alan
This is offered at £670.00 each (app.$1051 usd) ex-works Stonehaven. This includes stainless steel mounting bracket, hydraulic fittings and a length of 4mm OD 316 tube.
An external over-pressure relief valve would be approximately £140.00 ea.
The compensator may be used in an 'intelligent mode' as they are supplied as standard with a reed switch fitted. For this purpose we offer the industry a subsea interconnecting cable for an additional £210.00.
----- Original Message -----
Sent: Thursday, February 16, 2012 6:26 AM
Subject: [PSUBS-MAILIST] Bladder Compensator
Found some bladder compensators that look ok for oil filled motors. They come in vatious sizes i think.