Installation of mudmat by crane master .
Mudmat is the temporary seafloor support for jackets and subsea equipment.
The function of mudmat is to provide adequate area for load distrubation to the soil. Mudmats are designed to support the weight of structures plus additional loads imposed by the environmental conditions.
Commonly used mudmats, consist of a top plate and a number of perpendicular vertical stiffeners that function as load-bearing beams.
The fundamental aspect need to be consider in the design of mudmat is the vertical resistance of soil provided by the bearing capacity of the soil, resistance of the structure against sliding and over turning. Another aspect rarely being considered is the settlement of the mudmat.
Settlement of the mudmat can be predicted by comparison of applied pressure and the ultimate bearing capacity of the mudmat. Mudmats are the most reliable for on-bottom stability of drilling units.
The first step in design sequence requires geometrical engineer explore soil conditions at proposed location. By drilling and sampling a boring geometrical data are determined for the critical zone generally located to a 40 to 50 feet below the seafloor.
The mudmat should be designed based on bearing capacity of the seafloor soils as determined by the geometrical engineer.
The bearing capacity of seafloor can be predicted by using the formula,
Q = (f ×a×L) + (qu × A) f = skin friction factor of soil
a = perimeter area of foundation L=Penetration depth of foundation
qu =Often the bearing capacity of the soil is unknown, and in some instances the line of demarcation between the soil and the sea water is much undefined. Under these circumstances, the Jacket files,
subsea equipment may sink into the sea floor and become lost. In addition, any attempt to increase the bearing capacity of the soil typically involves increasing either the perimeter area of the foundation or the bearing footprint area of the foundation #engineering #talksubsea @cranemasterdotcom