055 DDG Large Destroyer Thread

[taxiya]

There was talk later generations of the 055 might have IEP but the first production batch certainly does not.
The main "range advantage" with IEP is that you can throttle down the engines and run on battery mode when you are just moving slowly or staying in the same place. Turbines typically have an optimum operating speed and anything below that means the engine runs suboptimally. That is why for example the 052D destroyers have auxiliary diesel engines. Even the 055 can run with just a couple of turbines to reduce consumption but IEP with batteries would further improve that albeit at much higher construction cost.

Where do you get the idea that battery is used in 055's IEP?

Chemical battery is never part of IEP, not in any surface ship proposal of PLAN at least. The energy storage in IEP is to smooth out the power spike, not for running the ship in any length of time (longer than few minutes). The storage is most likely flywheel based due to its higher energy density than battery (even li-on) and safety.

In a full GT IEP ship like 055, you don't throttle down any engines, but shutdown most of them and run the rest in full power. That is how GT is run efficiently.

 

[blindsight]

engergy storage mechanism is to smooth out the power demand spike as the ship's working condition is very dynamic. It is no where large engough to make a difference in range. It is like a UPS saving a patient on an operation table when there is a power outage but won't keep the hospital running longer than an hour.

The reason of using IEP to improve fuel efficiency is to keep one of the many gas turbines to run in full power to drive the ship in cruising speed instead of having many to run at lower than half power which is very inefficient like Arleigh Burke's COGAG.

An equaivlant solution other than IEP in this regards is CODAG where disel engine (high efficient in crusing) is used instead of GT.

IEP's advantage is obvious when taking into consideration of all other electricity demands such as radars, catapult and electrified weapons. But purely from the crusing/fuel effieciency perspective, IEP is not much better (if at all) than CODAG.

Sure, you always have other ways to maintain good efficiency. For example, there're 6 QD50 turbine generators on the 055. But think about it, if they have IEP, chances are they don't need that many QD50s at all. I guess it'll save some space and they might be able to carry more fuel.

 

[taxiya]

Sure, you always have other ways to maintain good efficiency. For example, there're 6 QD50 turbine generators on the 055. But think about it, if they have IEP, chances are they don't need that many QD50s at all. I guess it'll save some space and they might be able to carry more fuel.

I did not mean to dismiss IEP on 055, just saying that "energy storage in IEP" is not intended for what you suggested. It's contribution in "extending range" is neglectable.

 

[siegecrossbow]

asking Taiwanese to express opinions on China's military progression is somewhat akin to asking Ukrainians to comment on Russian army's capabilities...at best you are getting a heavily biased answer. the only reason a tw person is asked to comment is probably because he speaks mandarin and isn't from china.

That’s not entirely true. Shih Xiaowei is pretty good. The problem is that there aren’t too many serious military analysts in Taiwan in the first place.

 

[KushigumoAkane]

Just realized that this guy donned his PPE wrong. Obviously, he had put on his SCBA face piece, even his mask-mounted relgulator, BEFORE he put on his flash hood.

 

[Blitzo]

View attachment 78852
Just realized that this guy donned his PPE wrong. Obviously, he had put on his SCBA face piece, even his mask-mounted relgulator, BEFORE he put on his flash hood.

Isn't mask/facepiece first, followed by flash hood, the normal way?
I suppose it depends on the size of the flash hood's various holes.

In this one, it seems like the flash hood is meant to be put on first, then the face piece, and then the flash hood folded up over like a hoodie, but that's because the hole is big enough to do so.

 

[KushigumoAkane]

Isn't mask/facepiece first, followed by flash hood, the normal way?
I suppose it depends on the size of the flash hood's various holes.

In this one, it seems like the flash hood is meant to be put on first, then the face piece, and then the flash hood folded up over like a hoodie, but that's because the hole is big enough to do so.

The latter is what I'm referring to as the "correct way", especially for DC personnel. The hole should be big enough because there is a rubber band around it and the flash hood itself is pretty elastic.
In fact, you can see sailors on other Chinese warships don PPE in this way:

(

)
This is because the irregular shape of the face piece and the regulator makes it extra difficult to put on the flash hood:

And if you let it stay that way, more trouble awaits:

Finally, let me use a "broke-woke-bespoke" meme to summarize this:

That is all.

 

[Blitzo]

The latter is what I'm referring to as the "correct way", especially for DC personnel. The hole should be big enough because there is a rubber band around it and the flash hood itself is pretty elastic.
In fact, you can see sailors on other Chinese warships don PPE in this way:
View attachment 78853
(

)
This is because the irregular shape of the face piece and the regulator makes it extra difficult to put on the flash hood:
View attachment 78854
And if you let it stay that way, more trouble awaits:
View attachment 78855
Finally, let me use a "broke-woke-bespoke" meme to summarize this:
View attachment 78856
That is all.

Not to belabour the point too much, but one issue with putting the flash hood on first, imo is that you need more time to correctly cover up the facepiece and associated breathing equipment and to ensure that the head and neck are appropriately placed and won't fall backwards and leave a patch of skin more exposed.
In the picture on the broke slot, there's a rather large piece of skin on the right side of the temple that isn't covered between the mask and the flash hood.

Putting the flash hood on last, means the important parts are all fully covered, but at the expense of potentially poorer visibility.

I'd be interested to know if there was an official proper way of donning on PPE for damage control crew, but tbh both methods seem like they have their place pending how much of a rush the crew are in.

 

[KushigumoAkane]

Not to belabour the point too much, but one issue with putting the flash hood on first, imo is that you need more time to correctly cover up the facepiece and associated breathing equipment and to ensure that the head and neck are appropriately placed and won't fall backwards and leave a patch of skin more exposed.
In the picture on the broke slot, there's a rather large piece of skin on the right side of the temple that isn't covered between the mask and the flash hood.

Putting the flash hood on last, means the important parts are all fully covered, but at the expense of potentially poorer visibility.

I'd be interested to know if there was an official proper way of donning on PPE for damage control crew, but tbh both methods seem like they have their place pending how much of a rush the crew are in.

I don't know what's PLAN's regulation on this, but here's how USN does it:

 

[Blitzo]

I don't know what's PLAN's regulation on this, but here's how USN does it:

Looking up a few videos, it seems like hood first is the norm in which people are trained, but tbh I can see a few reasons for putting hood on last. The time to adjust the hood to make sure it overlaps with the mask is notable in all of those videos, and depending on the environment, putting on the facepiece and breathing equipment first might well be necessary to let you see and breathe to do the rest of your job.
Shoving on the hood last if it saves a few seconds of time and knowing you're safely fully covered, in exchange for slightly poorer visibility, seems reasonable to me.

Of course, in this case they probably just put it on in the "wrong" order, but I think there's also some fair advantages to it as well.