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Answer:
Given the vessel is 6040mm dia with a wall thickness = 20mm and Limpet / Half pipe coli wit a pitch of 150 mm and 40 mm radius.
Referencing, ASME VIII Div 1, appendix EE, figure EE-2 (DN80).The value K is read from curve, but parameter D is beyond the scope: D = 6040 mm / 25.4 mm = 237.79 in.
Other applications like PV Elite considers the Diameter D = 170 instead of 237.79, then they have a K value found from reading the chart. However, the actual geometry is beyond the chart.
Referencing ASME VIII div.2 4.11.5 DESIGN OF PARTIAL JACKETS and ASME VIII div.1 NONMANDATORY APPENDIX EE HALF-PIPE JACKETS, AutoPIPE Vessel is the ASME VIII div.2 4.11.5 where there is no charts but equations.