text: it is actually EEMUA 143.  looks like you can buy it for 25 quid.  according to their web site, it is described as below:\n\n143\nRecommendations for Tube End Welding: Tubular Heat Transfer Equipment Part-1 - Ferrous Materials\n\nISBN0 85931 093 0\n£25.00\n\nDate(1985) (formerly OCMA Spec. No. TEW-1)\nThis specification covers recommended procedures for the tube-end welding of tubes ranging from ½ in (15 mm) to 1½ in (40 mm) nominal diameter and from 1.6 mm to 4.1 mm wall thickness to tube plates of 15 mm and over in ferritic and austenitic materials.