ivorthediver wrote: ↑Sat Jan 05, 2019 4:05 pm
You have highlighted the obvious external changes which you were kind enough to point out to us , but what of the less glamorous hull overhaul works and what will this involve other than a coat of paint in the dry dock .
Are there any renewals , refurbishment's , replacements envisaged , and or additions to be undertaken that you know of please.
Would it be reasonable to assume that all the change overs of in respect of missiles comms etc require a substantial gut out of wiring equipment racks ? . and will the gen sets be taken out up through the hull or cut out through the side of the hull .
Ivor I am more than a tad confused with regard to some of your queries; the answer (or partial answer) to many of them are carried in the link I provided in my post.
Re your Q. :-
Q.
Are there any renewals , refurbishment's , replacements envisaged , and or additions to be undertaken that you know of please
A. ......the refits also include major changes to equipment, the combat system, chilled water arrangements and work to extend the life of the hull and superstructure
(also)
A. The PGMU project comprises
5 separate components (which the DE&S tendered for in ‘lots’);
diesel generators,
power conversion equipment,
electrical switchboards, the
machinery control and surveillance system (MCAS) and
the integration work
Hitzinger UK won a £12M contract for the voltage converters
Rolls-Royce signed a £18M contract in January 2016 to deliver the updated MCAS
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Q. ....
require a substantial gut out of wiring equipment racks ?
A. The project
includes installing 600m of new pipework in each ship together with o
ver 8km of new cable.
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Q. ....
will the gen sets be taken out up through the hull or cut out through the side of the hull
A. The Upper Auxiliary Machinery Room (UAMR) and the Forward Auxiliary Machinery Rooms (FAMR) have to be almost entirely stripped out and new machinery foundations and uptakes and downtakes fitted.
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That was as provided by the link to an article titled:-
New engines for the Royal Navy’s Type 23 Frigates dated June 27, 2018 carried in SAVE THE ROYAL NAVY website
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The Royal Institute of Naval Architects put the PGMU as follows:-
First Type 23 PGMU implementation set to start
Warship Technology: July/Aug 2017
The Royal Navy’s 13 Type 23 frigates are currently fitted with four Paxman Valenta 12 RP2000CZ diesel generators, the design of which dates back to the late 1960s. These have suffered from a long-term decline in reliability, and reduced generating capacity in hot environments (an engine nominally rated at 1.3MW may only deliver 1MW in warm weather conditions).
Electrical power generation
The PGMU programme, which will replace the main generators and conversion equipment, adapt the switchboards and change the MCAS system, is intended to regain and maintain full safety, availability and capability in terms of electrical power generation on the Type 23 frigate. This will allow for operations in all theatres out to end-of-life.......
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In its entirety, the PGMU A&A package – the biggest design change for the Type 23 platform since build – will involve the
installation of nearly 600m of new pipework and
over 8km of new cable. Work
will require the complete strip out of the Upper Auxiliary Machinery Room (with only the High Pressure Air Compressor remaining),
partial strip out of the Forward Auxiliary Machinery Room (with
significant changes to pipework and seatings) and
new uptakes and downtakes for the diesel generators.
3D computer-aided design technology has been adopted by Babcock, as systems integrator, to support the design and production process. In the first instance,
each affected compartment was laser scanned from 10 different positions to create a detailed digital image.
Designers then removed redundant systems from the model, and overlaid the new systems in software
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The full article can be read in
this link to the article source the RINA
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My guess is that the machinery is to be changed through the deck surrounding the uptakes/downtakes perhaps by removing a deck plate or three.
Taking into account the description of preparatory work associated replacing the GENSET's I thought you might find the following piece in the JNE, together with diagram of the intended look of the Type 23 Duke Class, to be of interest (note the date):-
THE TYPE 23 FRIGATE
This article is bused on the presentation given by the authors at the Royal Naval Engineer Officers' Conference on 4 May 1984
v29b1p03a.pdf
Assuming the ships in the class were built as outlined in the following diagram, my suggested route for removal and replacement would be feasible.
Screenshot (3649).jpg
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Hope that is of some help