Not a bad shortlist there now to go and have a look to see which ones are vapourware designs
With the help of Mr Google, I've attempted to answer this question from a week or two back.Note this relates to the Endeavour replacement. Apologies for length.
Navantia
State-owned Spanish shipbuilder that scooped the Australian AWD and LHD contracts. Their latest auxiliary, the Cantabria, was commissioned in 2010. At 170m and 19,500 tonnes, she may be a little big for NZ’s requirements. The RAN took her for a 10-month test drive in 2013.
Spanish Armada Ship Cantabria arrives in Australia | Royal Australian Navy
Cantabria has a little sister, the Patino, built in 1995. At 17,000 tonnes, she may be a better fit for NZ. In any case, these two vessels prove that Navantia can scale the same basic design.
Patino Class Auxiliary Oiler and Replenishment Ship - Naval Technology
Both these vessels appear to have much larger crews (approx. 130) than the existing Endeavour’s 50-strong complement, which would push up operating costs.
Australia has short-listed Navantia and Daewoo as preferred suppliers for two new auxiliaries. Good overview here.
Australia’s Next Supply Ships: Serious about Success
Given much of the Australian fleet is now Navantia-designed, I suspect commonality benefits mean Navantia will win the contract, with Daewoo included just to keep them honest on price.
DEFENSE STUDIES: Australia and Navantia Sign Contract for Design Analysis of Two Supply Ships
Fincantieri
https://www.fincantieri.it/cms/data/pages/000052.aspx
Italian builder of naval vessels and cruise liners, Fincanteiri is currently churning out FREMM frigates, and has recently built an interesting LPD for the Algerian navy. They built the Etna refuelling ship for the Italian navy in 1998. Etna is NH90-capable and has space for 12 TEU containers as required in the NZ specs, but fuel capacity appears a little low. At 21 knots, very fast for a support vessel.
Etna Class - Naval Technology
Two enlarged versions, the Deepak class, were supplied to the Indian Navy in 2011.
INS Deepak Underway-Replenishment Fleet Tanker
The Indians had some gripes over steel specifications, but all three vessels appear to be operating effectively in service.
Damen
Welcome - Damen Schelde Naval Shipbuilding
Damen is a highly respected Dutch designer and builder of commercial and naval vessels. Currently delivering SIGMA corvettes to Indonesia, among many other projects. Experienced in building in offshore or customer-nominated yards, and part-owner of a Vietnamese shipyard. Has supplied non-combat vessels to the RAN.
RAN News
Doesn’t have a tanker portfolio that I am aware of, but undoubtedly could create or modify a design. Built the JSS Karel Doorman for Netherlands – an extremely impressive multi-purpose vessel with a hefty price tag approaching 400 million Euro. Would be great for NZ, but well outside our budget.
The Dutch JSS Multi-Purpose Support Ship
Seaspan
Home - Seaspan
Vancouver-based company that has recently has focussed on repair/overhaul work and building ferries for the Canadian market. Winner of major contract for non-combat vessels under Canada’s National Shipbuilding Programme.
Vancouver Shipyards, National Shipbuilding Program, Non-Combat vessels
Given the steep costs for locally building the two Berlin-class AORs that Canada has ordered, it seems likely Seaspan would seek to do a build for NZ outside of Canada. Pitching for the NZ contract may be a way of getting more value out of the design/engineering team they need to meet their demands from the Canadian navy.
Has to be considered a very long shot for the NZ contract.
TeeKay
https://teekay.com/
This is the least-known contender. Teekay is an American-based firm whose main business is the transportation and storage of oil and related fuels. They run a fleet of around 100 tankers, either owned or leased.
https://teekay.com/business/tankers/
As far as I can tell, they have no shipyard and most of their vessels were built in either Korea or China. No indication of their in-house design/engineering expertise, but they didn’t get this big by buying ships that aren’t both cheap and effective.
May have been included by NZDF to provide a commercial baseline cost that militarised tankers can be compared against.
Hyundai
Shipbuilding | Business Overview | Corporate Information | HYUNDAI Heavy Industry Investor Relations
The world’s largest shipbuilder. If it floats, these guys can build it. Supplied the current HMNZS Endeavour, which has given good service at very modest cost.
The Hyundai website used to have a good Naval section, that I am now unable to find. That showed (from memory) a family of three small tankers that had a ‘Son of Endeavour’ appearance. Size ranged from around 8000 – 15,000 tonnes (again, from memory). The largest one could be a contender for NZ. There were no detailed specs, but if anyone finds the page please post the link.
Korea itself is said to be introducing a new class of replenishment ship between now and 2020 – the AOE-II. I haven’t found any specifications, but some web reports have Hyundai winning a contract for three ships.
If the size and specs were broadly similar to NZ’s requirements, Hyundai would be able to deliver at low cost as they would already have a production line running.
Daewoo Shipbuilding and Marine Engineering (DSME)
Korea’s no. 2 shipbuilder. Currently producing four MARS Tankers for the UK.
RFA Tide Military Afloat Reach and Sustainability (MARS)
Britain’s Tide Class: Supplies are From MARS
Also building a smaller tanker for the Norwegian navy, that looks similar to NZ's requirements.
BMT’s Aegir design selected for Royal Norwegian Navy’s JLSS programme - Naval Technology
Both these designs are from the Aegir family of British design house BMT. A brochure is here:
http://media.bmt.org/bmt_media/resources/38/AegirBrochure.pdf
The BMT Aegir 18A design was proposed by Aust Submarine Corp as a joint Korean-Australian solution to the RAN’s need for new auxiliaries. However, the Aust government has opted to seek bids directly from Navantia and DSME.
The fact that five vessels are already planned or under construction from this design family must serve to lower risk. Add in the existing links between RNZN and BMT, and I would rate DSME as favourite to win the NZ contract for a new tanker/auxiliary.