I have a similar problem with 4X spike at 0.68 ips but generally in the horizontal readings. I got some 0.5X harmonics as well, 4X, 4.5X, 5X and 5.5X at lower amplitudes.My gearbox is a simple speed increaser, single. What I've noticed is that 4X has always been a prominent spike in readings...
The shoreline pump is a large pump that sends crude from an offshore platform to a processing facility on land. It consists of a Gas engine driver Cat G399, a Western 8110MS speed increaser gearbox and a 5 stage IR pump. Very high vibration (0.78 ips peak), was detected in the horizontal...
Thank u all for the input and concern. The cam gear has 96 teeth. the crankshaft gear 48. main idler 71 teeth. oil pump gear 32 teeth. water pump gear 25 teeth. the oil pump is gear type with 12 teeth. There are two balancer gears but we are not sure how many teeth (suspect may be approx. 40 and...
As far as I know there are no rolling elements closeby here.The accessory gears etc run on sleeve bearings.I agree with the sideband at .5x. I have to look at the drawing to determine which ones turn at .5X the crankshaft speed. Drawings are difficult to source here.
Routine vibraton readings were taken on a caterpillar G398 engine generator set. This unit runs at a constant speed of 1200 rpm. An increase of over 100% in the overall amplitude of vibration was detected for a reading on the outboard axial (non drive end radiator/fan side) of the engine...
Thanks everyone. We eventually got the manual. For everyone's learning the gas producer design speed is 15 015 rpm. The 1st critical occurs at 6000 rpm. The 2nd at 8200 rpm. The powerturbine design speed is 15 700. The 1st critical is at 5140 and the 2nd. at 12690.
The main bearings #1 and #2 of a G399 Cat engine failed after 17000 hrs. The inboard crankshaft seal was leaking for a long time prior to failure and heavily at the time of failure. The failed bearing closest to the seal showed the most damage and indicated metal to metal contact. The #2 bearing...
