Shaft alignment input data

To model propulsion shafting properly the background information for shaft alignment design must be as complete as possible. There is three categories of essential information:

Category I – obligatory information for shafting modeling.

Category II – information describes shaft alignment and operating conditions.

Category III – information enables more relevant results for shaft alignment procedure to ensure more safe propulsion shafting.

Pos	Name	Category
		I	II	III
I. GENERAL
1	Ship Type and main particulars	*
2	Ship Class	*
3	Ship speed			*
4	Maximum Continuous Rating			*
5	Shaft speed at MCR			*
6	Shaft speed Nmin		*
7	Ship status (newbuild or under repair)	*
8	Cause of the propulsion train realignment, if the ship is under repair	*
9	List of main operating conditions	*
10	Assumed shaft alignment conditions		*
11	Assumed shaft alignment technique		*
12	Shaft alignment procedure limitations if any		*
13	Other special conditions	*
14	Known shafting or/and bearing failures for a ship under repair	*

Pos	Name	Category
		I	II	III
II. SHAFTING
1	General Arrangement of the propulsion train	*
2	Shafting drawings specifying the lengths and diameters, half coupling and sleeve drawings, the direction of the sleeve coupling shifting at alignment, stern tube drawings	*
3	Weight and center of gravity of heavy masses attached to the shafting	*
4	Filling of the shaft bore (oil, rod etc.), oil and rod masses	*
5	Shaft material mechanical properties	*
6	Material (mechanical properties ) and dimensions of the propeller shaft liner if it is arranged	*
7	Positions of the hydraulic jacks if the jack-up test is planned		*
8	Positions of the strain gauges if strain gauges alignment is planned		*

Pos	Name		Category
			I	II	III
III. SHAFTING BEARINGS
1	Stern tube bearing
		drawing of the bearing	*
		material and dimensions of the bearing bush	*
		lubricator (sea water, fresh water or oil, viscosity and density)	*
		diametric clearance	*
		slope bore angle if the bearing is slope bored (angle)	*
		double slope design if arranged (trumpet-form slope length, angle, diametrical clearance)	*
		measured stern tube axis spatial position if available			*
2	Permissible load or nominal pressure		*
3	Thermal growth		*
4	Wear down rate				*
5	Thrust bearing eccentricity				*
6	Is plain intermediate bearing self-adjustable?		*

Pos	Name	Category
		I	II	III
IV. PROPELLER
1	Propeller type (FPP, CPP)	*
2	Number of blades	*
3	Diameter	*
4	Material	*
5	Mass	*
6	Center of gravity	*
7	Weight in the water	*
8	Hub length	*
9	Hub diameter	*
10	Pitch			*
11	Expanded Area Ratio			*
12	Percent of buoyancy if shaft alignment is planned afloat	*
13	Percent of submergence in operation		*
14	Propeller hydrodynamic loads in operation or wake flow information, or ship lines if other data are not available			*
15	The position of the point where hydrodynamic loads are applied			*
16	Propeller speed at MCR			*

Pos	Name	Category
		I	II	III
V. GEARBOX
1	Gearbox type	*
2	Drawing of the output shaft specifying shaft lengths and diameters	*
3	Bearing design (plain, roller, conical roller)	*
4	Bearing clearance	*
5	Bearing thermal growth in horizontal and vertical plane		*
6	Shaft alignment acceptance criteria from the manufacturer		*
7	The weight of the wheel	*
8	Toothing forces in operation or gearing and tooth geometry		*

Pos	Name	Category
		I	II	III
VI. FLEXIBLE COUPLINGS
1	Coupling type	*
2	Weight and center of gravity	*
3	Allowable misalignment for flexible coupling		*
4	The angular and radial stiffness of the flexible coupling	*
5	The direction of sleeve coupling shifting at the alignment		*

Pos	Name	Category
		I	II	III
VII. ENGINE
1	Type	*
2	Crankshaft drawing, or equivalent beam	*
3	Weight of flywheel	*
4	Diagram of allowable loads on the engine flange or bearing allowable load		*
5	Engine bearings thermal growth		*

Pos		Name	Category
			I	II	III
VIII. HULL
1	Hull material		*
2	General arrangement drawings of engine room area				*
3	Drawings of hull structure sections within the engine room				*
4	Engine room double bottom plan				*
5	Scantlings of double bottom structure elements				*
6	Drawings of the A- and P-brackets if any				*
7	Ship draught assumed during shaft alignment procedure				*
8	Ship draught at main operating conditions				*