CV-17 Shandong (002 carrier) Thread I ...News, Views and operations

[Intrepid]

It is likely on a warship all 4 boilers would be identical and any boiler can route its steam to any of the turbines to form an ad hoc unitized propulsion cell. So 1 and 3 and then 2 and 4 may just be random and reflect a non-purposed selection of the testing order.

Type 001A is an eight-boiler-ship. And if I remember correctly, there are two rows with 4 boilers each serving two turbines in the forward machinery rooms and two turbines in the aft machinery rooms.

 

[Intrepid]

I have found the boiler and turbines arrangement:

https://www.sinodefenceforum.com/plan-aircraft-carrier-programme-closed.t6479/page-599#post-405417

 

[Hendrik_2000]

I am really surprise it is a tubular boiler and not a frame boiler
Those kind of boiler is common in industrial plant. big building. It is a small boiler no wonder they need that many
The advantage is obvious It is low slung boiler

 

[Richard Santos]

Type 001A is an eight-boiler-ship. And if I remember correctly, there are two rows with 4 boilers each serving two turbines in the forward machinery rooms and two turbines in the aft machinery rooms.

I doubt the boilers are tied specifically to,a turbine. In large 4 shaft warships, any boiler can serve any turbine. The arrangement of the boiler and turbines are intended to ensure any single underwater hit will most likely take out only 1/4 of the turbines and boiler power, or at very most take out 1/2 of the turbines and boiler power.

 

[Intrepid]

It is a small boiler no wonder they need that many

Eight or twelve boilers is normal for big oil-fired warships.

 

[delft]

I am really surprise it is a tubular boiler and not a frame boiler
Those kind of boiler is common in industrial plant. big building. It is a small boiler no wonder they need that many
The advantage is obvious It is low slung boiler

You don't have the space in a warship to use huge industrial boilers.

 

[asif iqbal]

Cv-17 start sea trials

My feeling is commissioning will be quick it has 89 along with it the commissioning staff house while out at sea

I like the way Chinese work their programme

 

[Richard Santos]

Eight or twelve boilers is normal for big oil-fired warships.

8 boiler, 2 boiler per shaft, has been pretty much standard on big 4 shaft warships since WW2.

While any boiler can serve any turbine, on large warships, steam from each boiler is typically specifically routed to one turbine, and not shared between turbines. Having 2 boiler per turbine allow all shafts to remain in operation when one boiler is taken down for economy or for maintenance. Having only 1 boiler per turbine is feasible but avoided on large warships because it means all boiler has to be in continuos operation for all shafts to turn. Trailing an unpowered shaft in normal operation both create handling problems for the ship, and create drag.

Having more than 2 boilers per shaft is uneconomical from space utilization perspective. 2 big boilers takes up less space than 3 or 4 smaller ones.

 

[Intrepid]

Having more than 2 boilers per shaft is uneconomical from space utilization perspective. 2 big boilers takes up less space than 3 or 4 smaller ones.

The Essex class had 8 boilers, the Midway class had 12 boilers and the Forrestal class had 8 boilers again. 8 boilers than was standard until the last oil fired carrier John F. Kennedy.

The Essex class was designed with an endurance of 20000 nm at 15 kts. But this could only happen when several boilers were shut down. In practice at least seven of eight boilers were set on fire to react quickly in case of a submarine attack and endurance was less then designed.

 

[Iron Man]

Having only 1 boiler per turbine is feasible but avoided on large warships because it means all boiler has to be in continuos operation for all shafts to turn. Trailing an unpowered shaft in normal operation both create handling problems for the ship, and create drag.

That is incorrect. It is routine practice especially for warships with GTs to leave one shaft unpowered. A COGAG warship for example, will have 2 cruising speeds, one resulting from a single GT turning a single screw at near maximum output and leaving the other screw to drift (with 3 GTs offline), and a second higher cruising speed with 2 GTs at near maximum output, each turning a single screw, while the other 2 GTs are left offline.