Type and task of platform
No.4 Shengli Work Platform is a well repair platform of gear rack three-leg self-elevating type, which is composed of main platform part, jacks (with shoes) and lifting system. The shape of main platform part approaches the triangle, the three columns are arranged at fore & stern, and the shoes are square shape. The platform main task is well repair in the scope of water depth 5-18m.

Main parameter and general function

Platform principal dimensions and index
a. L.O.A x L.B= 45m x 33.6m
b. L x B x D ="37m" x 33m x 4.2m
c. Jack quantity: 3
d. Jack length x diameter: 46m x 2.5m
e. Jack shoe ( length x width x depth): 11m x 11m x 1.8m(square bottom area: 121m2)
f. Cantilever beam ( length x width x depth): 22m x 0.6m x 3m
g. Oil derrick movement: transverse direction is ±3.5m; longitudinal direction from turntable center to stern, the largest distance is 7m
h. Accommodation: 4 floors, height of floor is 3m
i. Well repair machine: the largest load: 1350kn.
j. Lifting capacity: 16t x 25m, 1 set; 10t x 20m, 1 set
k. Vessel-elevating capacity: 960t x 3
l. Fixed number of persons: 35
m. Holding force: 20 days
n. Use period: 20 years.
o. Camber: 0.33m
Frame position: 0.5m