A tubular installation system for J-laying tubulars wherein the system comprises: - a J-lay tower structure for lowering and/or raising a tubular or an accessory along a firing line extending along the tower; - a support for supporting the J-lay tower structure; - a tubulars supply system, preferably provided on the support, for supplying tubulars to an essentially horizontal tubular supply position in the vicinity of the tower, - a loader device for transporting a tubular between the essentially horizontal supply position and the firing line, wherein the loader device comprises: ∘ one or more tubular grippers (21a, 21b, 21c) adapted for gripping the tubular, ∘ a base, preferably provided on the support, ∘ a boom to which the one or more tubular grippers are attached, which boom is pivotable with respect to the base in a boom pivot direction about a horizontal boom pivot axis, between a lowered position for gripping a tubular in an essentially horizontal tubular supply position, and a raised position for delivering a tubular to the firing line and vice versa; - an accessory supply system, preferably provided on the support, for supplying an accessory to an essentially horizontal accessory supply position in the vicinity of the tower, - accessory handling means for transporting the accessory between the essentially horizontal accessory supply position and the firing line, characterized in that the accessory handling means are distinct from the tubular grippers (21a, 21b, 21c) and are attached to the boom of the loader device, at a different position than the tubular grippers, such that the loader device can be used as desired for transporting a tubular or an accessory between the respective supply position and the firing line. - a J-lay tower structure for lowering and/or raising a tubular or an accessory along a firing line extending along the tower; - a support for supporting the J-lay tower structure; - a tubulars supply system, preferably provided on the support, for supplying tubulars to an essentially horizontal tubular supply position in the vicinity of the tower, - a loader device for transporting a tubular between the essentially horizontal supply position and the firing line, wherein the loader device comprises: ∘ one or more tubular grippers (21a, 21b, 21c) adapted for gripping the tubular, ∘ a base, preferably provided on the support, ∘ a boom to which the one or more tubular grippers are attached, which boom is pivotable with respect to the base in a boom pivot direction about a horizontal boom pivot axis, between a lowered position for gripping a tubular in an essentially horizontal tubular supply position, and a raised position for delivering a tubular to the firing line and vice versa; ∘ one or more tubular grippers (21a, 21b, 21c) adapted for gripping the tubular, ∘ a base, preferably provided on the support, ∘ a boom to which the one or more tubular grippers are attached, which boom is pivotable with respect to the base in a boom pivot direction about a horizontal boom pivot axis, between a lowered position for gripping a tubular in an essentially horizontal tubular supply position, and a raised position for delivering a tubular to the firing line and vice versa; - an accessory supply system, preferably provided on the support, for supplying an accessory to an essentially horizontal accessory supply position in the vicinity of the tower, - accessory handling means for transporting the accessory between the essentially horizontal accessory supply position and the firing line, characterized in that the accessory handling means are distinct from the tubular grippers (21a, 21b, 21c) and are attached to the boom of the loader device, at a different position than the tubular grippers, such that the loader device can be used as desired for transporting a tubular or an accessory between the respective supply position and the firing line.