Foxtrot Site
This site contains all the information provided to Templeton & Associates by Michels Directional Crossings prior to the commencement of their Boston Harbor project. Michels will be using two liftboats, the CHOCTAW and the ARAPAHO, owned and operated by Cudd Pressure Control. This site also contains the calculations and submittals made to both ABS and the USCG on behalf of Cudd Pressure Control relating to the imposed forces on the two liftboats. To download files, right click on the following links and choose “Save Target As”.
FILE NAME	FILE FORMAT	FILE SIZE	COMMENTS
Salem Landfall	AutoCAD14	269KB	Michels profiles of the operational areas containing water depths, soil data, angles, distances, and general equipment arrangements.
Beverly Harbor	AutoCAD14	376KB
Deer Island	AutoCAD14	266KB
Georges Island	AutoCAD14	369KB
Deck Equipment	AutoCAD14	275KB	Michels drawing (plan and profile) of the drill rig on the liftboat deck.
Welding	MicroSoft Word	82KB	Michels welding specifications and design notes
The following analyses were made using MOSES and the existing vessel model. The 500 kip horizontal pull was exerted at 5’ above the deck. Gravity loads include hull weight, full deck load, and liquid variables. All 3 runs are for extended leg (water depth + air gap) = 50 ft.
No Load	PDF	19KB	STATIC CONDITION - No horizontal pull, wind, or current. Maximum unit check = 0.12. Force on stern leg = 634 kips.
Pull	PDF	16KB	MAXIMUM WORKING CONDITION IN CALM WATER - 500 kips horizontal pull, no wind or current. Maximum unity check = 0.91. Force on stern leg = 1084 kips.
Boston	PDF	19KB	DYNAMIC CONDITION - 500 kips horizontal pull, 50 knot wind, and 3 knot current. Maximum unity check = 0.97. Force on stern leg = 184 kips
The required safety factor = static force/(static force – dynamic force) = 634/(634-184) = 1.4. Using a safety factor of 1.75, we developed the following graph.
Max-pull	PDF	36KB	Maximum allowable horizontal pull vs. extended leg