A system for supporting a catenary riser coupled to an offshore platform, comprising: a pull tube having an outer diameter surface and an inner diameter surface, the inner diameter surface being sized to allow the riser to pass therethrough; the pull tube having a lower end disposed downward from the offshore platform and at an upper portion distal from the lower end disposed toward the offshore platform; and the pull tube further having one or more segments welded together to establish one or more welded connections with the pull tube extending longitudinally on both sides of the welded connections; a pull tube guide coupled to the offshore platform and coupled to the outer diameter surface of the pull tube between the lower end and the upper portion; a first pull tube stress joint sleeve disposed around a length of the pull tube at a first welded connection and longitudinally extending on both sides of the first welded connection, the sleeve having an outer diameter surface and an inner diameter surface, the sleeve inner diameter surface being larger than the pull tube outer diameter surface, an annular gap being formed between the two surfaces and characterized by: a first quantity of fill material coupled between the sleeve inner diameter surface and the pull tube outer diameter surface to fill a cross section of the annular gap, wherein, optionally, the first pull tube stress joint sleeve comprises a plurality of sleeve portions that are coupled together to form the sleeve. a pull tube having an outer diameter surface and an inner diameter surface, the inner diameter surface being sized to allow the riser to pass therethrough; the pull tube having a lower end disposed downward from the offshore platform and at an upper portion distal from the lower end disposed toward the offshore platform; and the pull tube further having one or more segments welded together to establish one or more welded connections with the pull tube extending longitudinally on both sides of the welded connections; the pull tube having a lower end disposed downward from the offshore platform and at an upper portion distal from the lower end disposed toward the offshore platform; and the pull tube further having one or more segments welded together to establish one or more welded connections with the pull tube extending longitudinally on both sides of the welded connections; a pull tube guide coupled to the offshore platform and coupled to the outer diameter surface of the pull tube between the lower end and the upper portion; a first pull tube stress joint sleeve disposed around a length of the pull tube at a first welded connection and longitudinally extending on both sides of the first welded connection, the sleeve having an outer diameter surface and an inner diameter surface, the sleeve inner diameter surface being larger than the pull tube outer diameter surface, an annular gap being formed between the two surfaces and a first quantity of fill material coupled between the sleeve inner diameter surface and the pull tube outer diameter surface to fill a cross section of the annular gap, wherein, optionally, the first pull tube stress joint sleeve comprises a plurality of sleeve portions that are coupled together to form the sleeve.