Fit-up: SmartFit

Key details

  • Advance indication of expected HiLo

  • Meet project HiLo and improve weld quality

  • Reduction in fit-up time and increased productivity

  • Ability to fit-up ‘out-of-specification’ pipe

  • Reduce downtime (repairs, cut-outs) and minimise rejected pipe

  • Selection of 'golden' pipes for stalk tie-ins

  • Optional remote global software support

All of the above is possible with out-of-specification ‘problem pipe’

Following the measurement of the pipe and analysis of the potential for the fit-up, the next step is a process of implementing the improvement that we call SmartFit. This process involved taking the measurement data and then implementing the SmartFit process. Here are some examples:

a. Avoidance of occasional problems offshore

In this scenario before a pipe is selected for welding it is checked in the database and a trial fit is performed which will indicate the best, worst and average fit-up likely when these two pipe are brought together. If there is no chance of a fit at any rotation this pipe must be temporarily rejected until a pipe is found that matches it.

b. Improved fit-up of all pipe

Instead of just rejecting the pipes that do not match each other, every pipe is rotated until the best fit is achieved. This operation is only a matter of lining up two marks so is relatively quick to perform. Subsequently, the benefit will be found in that the two pipes will fit the best they can and the welding process will proceed more easily.

c. Extra refinement of fit-up by local sorting

In this case, the pipes are placed in queue before selection. Depending on the analysis two to thirty pipes may be in the queue and the smartFit software will determine which order the pipes are to be used to gain another level of improvement in fit-up. In this case it is very unlikely that a pipe will be rejected. In some cases pipe will also be pre-sorted into “basic” and “golden” pipe depending on the ease of fitting these pipe together. The golden pipe will be selected whenever there is a critical section of the pipeline to be constructed.

d. Ultimate refinement by sequencing pipe

In this final version the pipe to be used, for example for a steel catenary riser (SCR) are loaded onto the boat in a specific order. Although suffering from the laws of diminishing return, the benefits of reducing the maximum HiLo from 0.7 mm to 0.5 mm may be considered sufficient for this method to be selected.

All of these methods are supported by the SmartFit software solutions which are tailored to each level of difficulty. In some cases local operators are trained to execute the SmartFit process and in other cases the customer will ask OMS to supply it’s seasoned and experienced operators to ensure the best possible results without compromising any other part of the operation.