DRILL FLOOR IMPACT

DRILL FLOOR IMPACT--A NEW WEIGHT SAVING APPROACH

CISI performed a study on the possibilities of using HT-Steel to reduce weight on the steel structure of drill floors commonly used in the offshore industry.

By using the latest in-house technology on welding techniques, we are able to design and construct commercial liable structures with an Ultimate Tensile Stress level (UTS) of 1140 MPz (=162ksi)

According  to authority codes, we must re-calculate from UTS to a "fictuve" yield stress, which is the reference for impact studies.

As an example:  the next figure represents the result on the energy dissipation capacity of deck plating when a 9-1/2" collar drill pipe is dropped on the setback area.

All curves are based on the assumption that the "fictive" yield   se = 0.73 * UTS
Figures are based on a safety factor of 1.5

From the above chart, we may conclude that for the deck plating, a weight reduction of 40-45% can be achieved.  On plate-stiffener weight reduction, we need to perform a dedicated study to determine the weight reduction.  But, in general, significant weight reduction can be expected.

For more details regarding weight saving possibilities for impact loaded areas, please don't hesitate to contact us.

 

TYPES OF TEST
At Compliance Inspection it's all about the
Customer needs.  We provide the following
services and products:

 

• Dimensional Inspections
• Stacking Test
• Lifting Top Test (4 Point)
• Lifting Top Test (2 Point)
• Lifting Bottom
• Fork Lift Slot Test
• Restraint
• Transverse Racking
• Longitudinal Racking
• Longitudinal Inertia
• Lateral Inertia
• Walkway/Ladder
  
• Dynamic Rail Impact Test