The following sketch represents the calculation of the geometry of a Portainer crane based on the container ship specifications for which it will be used.
OUTREACH OF A PORTAINER® CRANE (R)
Use the following dimensions to calculate the required reach for a Portainer crane:
a: distance from sea side crane rail to edge of pier
b: container width
c: distance between edge of ship and containers
i: distance between pier and ship (fender clearance)
N: number of containers per beam
The above dimensions are used in the following formula to calculate required outreach:
HEIGHT UNDER SPREADER (H)
Use the following dimensions to calculate the required height under the spreader for a Portainer crane:
T: height from the keel to the hatchway cover
z: maximum equinoxal high tide + 5
t: height of the container
K: number of containers on deck
P: safe distance to manipulate the container
The above dimensions are used in the following formula to calculate height under spreader:
H: T - min. draft - z + (t*K) + .1(K-1) + p