Dear Sirs:
The obsolesence of many of the older PLAN platforms (warships) is the consequence of its' headlong modernization - as well as that of China's shipyards/shipbuilding in general.
I personally feel that many of the older warships, the Jiangwei 1 FFG's, DDG 113 and 114, DDG 167 as well as the Sov's fall into this category - not just the Luda and Jiangnan classes.
DDG 113/114 are probably still the most useful of the older vessels, having pioneered many PLAN systems, such as gas turbine engines, the twin-37 mm CIWS, a local version of TAVITAC(?), a helicopter hanger and SAMs.
Still despite this, they have older electronic systems, particularly in their radars (especially that enormous 2D affair amidships) and combat information systems - and are built on a small and rather unstealthy hull form.
DDG 167 is for me rather a disappointment, having the same armament layout as the older destroyers on a larger hull but with steam propulsion (Q - why does no other PLAN vessel adopt her 3D radar?). She like the Sov's are probably very expensive and fuel-hungry ships to operate, as well as difficult to maintain.
I believe the PLAN should not have imported the second set of Sov's, they were overpriced and very limited vessels. The fact that DDG 115 and 116 follow this obsolescent layout seems to indicate that a faction within the PLAN prefers this.
For the moment the PLAN should stick with either gas turbine propulsion or with diesel or better yet with CODAG or CODAD systems. Steam propulsion should be left to the nuclear submarines.
The most cost effective surface combatants the PLAN is acquiring are the 054A frigates, they should build a lot of them to replace all the older difficult to maintain and obsolescent vessels.
The best thing they could do with DDG 167 is to provide minor improvements to her missile systems, electronics and sensors, and hand her over to the training command.
Best Regards,
Dusky Lim