Units that are installed on board ships or floating production platforms may require the use of a dry sump design. This option would be required if the pitch and roll of the ship would cause either the crankshaft counterweights or connecting rods to contact the oil level and froth the oil. Excessive tilt can also cause the oil pick-up tube to lose suction. Serious bearing damage can result from such conditions.
The following table lists the maximum angle from horizontal that each frame can tolerate assuming the motion is transient like the rocking of a boat. This list does not apply to permanent installations on fixed foundations.
If the motion will exceed the listed maximum, then a dry sump should be installed. When “Use Dry Sump” is indicated, that frame requires a dry sump for any non-fixed application.
This table is based upon the oil level being maintained between one half and two thirds the height of the sight glass when the frame is completely horizontal.
|
Frame |
Maximum Angle (degrees) from Horizontal Tolerable Without Dry Sump |
||
|
Throws |
1 or 2 Throws |
4 Throws |
6 Throws |
|
JGI |
0.019 |
|
|
|
JGM |
4 |
|
|
|
JGP |
4 |
|
|
|
JGN |
4 |
|
|
|
JGQ |
4 |
|
|
|
JG |
4 |
2.5 |
|
|
JGA |
6.5 |
3.5 |
2 |
|
JGW |
1 |
Use Dry Sump |
|
|
JGR |
1 |
Use Dry Sump |
|
|
JGJ |
4 |
1 |
Use Dry Sump |
|
JGH |
3.5 |
2 |
|
|
JGE |
4 |
1.5 |
1 |
|
JGK |
1 |
Use Dry Sump |
Use Dry Sump |
|
JGT |
4 |
1.5 |
1 |
|
JGC |
4 |
1 |
Use Dry Sump |
|
JGD |
5.5 |
2.5 |
1 |
|
JGZ |
7 |
4 |
2.5 |
|
JGU |
7 |
4 |
2.5 |
|
JGB |
|
2 |
1.5 |
|
JGV |
|
2 |
1.5 |
|
KBB |
|
1.5 |
1 |
|
KBV |
|
1.5 |
1 |
Ariel
Corporation Application Manual
2 November 2006