Why is China purchasing 20 more units? At least from CMO, the Type 054 has really limited capacity to do anything in a conflict with the US. They seem very well geared for low intensity conflicts.
Unless they're going to upgrade the missiles?
Can't what?
Going by a simple list of boxes, for a general-purpose frigate:
1. Can they perform basic frigate functions?
yes outright. Doesn't require much from the ship - it has endurance, it has speed, it has gun, it has helicopter.
2. Can they perform AA mission?
HHQ-16 is clearly getting an update, so we may go with "
Yes". Given the potential of this missile system, we may reasonably safely assume it to again return as a competitive area-defense SAM. Not a world-beating capability, but reasonable. The replacement frigate may need to look into electronic part of the engagement cycle.
3.Can they perform ASW?
ASW suite was updated not that long ago; the ship has a full suite of sonars, torpedos, saw mortar, and ASW rockets. New construction ships are probably getting the ability to operate Z-20;
As a con, 054A will clearly lack higher silent speeds(characteristic of IEP) and the ability to operate prospective large as USVs and ASuVs, but this isn't a deal-breaker as of yet.
Yes, but we note that the need for "054B" starts to show itself. However, worth noting, that while the world standard for ASW frigate is definitely higher - if we assume that 054A was reasonable half a decade before - it still probably is right now.
4.Can they perform ASuW?
8 reasonably modern ASCM for a long-range strike, HHQ-16 for closer ranged engagements. Not a world-beater, not a slouch. Average, but average goes as
yes. It's worth noting, however, that (1) 054A is probably weaker in this aspect than likely opposition, and (2)it isn't terribly important. But newer frigate may go for more in this aspect. 802 missile isn't a world-beater - but it also can be updated.
5.Can they survive?
Electronics, EW and datalink suits are being kept up to date; self-defense suit is good in AA, probably only average for torpedoes, but very few modern ships really shine here. Again - sounds quite average, but average means
yes.
We can go by further and further missions, but I believe the result will be the same. Going by the 80/20 rule, for 80% of missions 054A is OK - and will likely remain so for a while.
Platform, however, slowly starts to show signs of obsolescence - and not in missiles and cells, but in spaces and equipment for deployable craft and propulsion - and those can't be added to existing or updated ships. This implies that in a medium-term perspective, perhaps no later than ~2030, this frigate needs to be taken out of sensitive screens (carriers) by something more capable.
But everything else, up to and including higher-end surface strike groups and asw sweeps- remains open for them.