The Type 037IS (NATO reporting name: Haiqing class) is the modernised version of the Type 037 (Hainan Class) anti-submarine patrol craft. A total of 20 hulls have been built by Shanghai-based Qiuxin Shipyard since 1993. The vessel was based on the hull design of the Type 037I, but with a redesigned superstructure and improved weapons and sensors. The displacement of the vessel was also increased to 478t.
The change of the Type 037IS’s weapon configuration reflected a shift in the vessel’s role, from ASW to more general patrol and escort duties. The vessel uses two dual-37mm AAA guns replacing the problematic Type 66dual-57mm AAA guns on the original Type 037. Early variants of the Type 037IS was fitted with two Type 76 dual-37mm manual AAA guns (8.5km range), while later variants were fitted with two Type 76F dual-37mm automatic AAA guns. The original two Type 61 dual-25mm AAA guns were replaced by two 14.5mm anti-aircraft machine guns (AAMG). The four Type 62 five-tube AS rocket launchers on the bow deck were replaced by two improved Type 87 6-tube AS launchers, which features automatic reloading. An optronic director is located on top of the superstructure to be sued in conjunction with the Type 76F AAA guns.
So far 20 hulls have been built. These are: 613, 614, 632, 634, 651, 710~717, 743,744, 761~763, 786~792.
Early variant Type 037IS with manual 37mm AAA (Chinese Internet)
Later variant Type 037IS with automatic 37mm AAA (Chinese Internet)
Specifications
Displacement: (full load) 478 tons Dimensions: Length 62.8 m; Beam 7.2 m, Draft 2.2 m Propulsion: 4 diesels, 8,800 bhp; 4 shafts Speed: 28 knots Range: N/A Crew: 71 Sonar: Hull mounted, high-frequency Guns: (Early variant) 2X Type 76 manual dual-37mm AAA gun, or (later variant) 2X Type 76F automatic dual-37mm AAA gun; 2X manual dual-14.5mm AAMG A/S Rocket: 2 Type 87 6-tubed fix launchers Depth Charges: 2 DC mortars, 2 DC racks Mines: Mine rails
