Roller set and pipe elements

A method for forming a region of a pipe element using a roller set for forming regions of a pipe element having an inner and an outer surface, said roller set comprising:

• an inner roller engageable with said inner surface, said inner roller comprising an inner roller body, a flange extending circumferentially around said inner roller body;
• an outer roller engageable with said outer surface, said outer roller comprising:
• an outer roller body rotatable about a first axis, said inner roller body being rotatable about a second axis, said flange projecting transversely to said second axis and being engageable with an end of said pipe element;
• a first raised feature comprising a first summit, engageable with said pipe element and extending circumferentially about said outer roller body and projecting radially from said first axis;
• a second raised feature comprising a second summit, engageable with said pipe element and extending circumferentially about said outer roller body and projecting radially from said first axis, said second raised feature being positioned adjacent to said first raised feature;
• a third raised feature comprising a third summit, engageable with said pipe element and extending circumferentially about said outer roller body and projecting radially from said first axis, said second raised feature being positioned between said first and third raised features;
• wherein
• said first and third summits are arranged in spaced relation away from said second summit;
• said second raised feature of said outer roller comprises a first projection extending circumferentially around said outer roller body and projecting radially from said first axis, said first projection having a first contact width over which it contacts said outer surface of said pipe element during roll forming, said roller set further comprising a second projection extending circumferentially around said inner roller and projecting radially from a second axis arranged coaxially with said inner roller, said second projection having a second contact width over which it contacts said inner surface of said pipe element during roll forming, said method comprising:
• positioning said inner surface of said pipe element on said inner roller with said inner surface contacting said second contact width of said second projection;
• moving said first contact width of said first projection into contact with said outer surface of said pipe element, said first and second axes being substantially parallel with one another;
• rotating said inner roller, thereby rotating said pipe element and said outer roller;
• while rotating said rollers and said pipe element, forcing said inner and outer rollers toward one another to deform said pipe element between said first and second projections.