In early October 2019 Anonymous kindly supplied further useful comments and links on the Netherlands’ Walrus Replacement Program (competition). Submarine Matters interest in Dutch submarine affairs goes all the way back to 2015 when "Kevin" provided useful insights.
Anonymous continues - Spain’s Navantia (marketing the S-80 Plus submarine) has been definitely excluded from the Walrus Replacement Program, because Navantia continuously committed serious and foolish design errors [1, 2].
COMPARISON
- a large TKMS Type 212CD with such technologies as Fuel Cell AIP = FC-AIP of the Type 212A
in a broader beam Type 216-like submarine
in a broader beam Type 216-like submarine
and
- a large SAAB-DAMEN modified A26, with such technologies as a Stirling engine AIP, in a wider
Collins-like hull of broader beam [3].
A large Type 212CD can be compared with a large SAAB-DAMEN A26 against criteria (1) - (10) below:
(1) Efficiency: 212CD’s AIP greater than SAAB-DAMEN A26’s
FC (which is an electrochemical system) is superior to the Stirling engine (a heat engine) in efficiency .
(2) Diving depth of AIP: Type 212CD greater than SAAB-DAMEN A26
Metal hydride FC (non-CO2 reforming type) generates water and is not affected by diving depth. The efficiency of the Stirling engine is reduced with an increase in diving depth because of increased exhaust back pressure (max. operation depth = ca.200m). Actual operation of the Stirling seems to be considerably shallower than 200m.
(3) Safety: the SAAB-DAMEN A26 is safer than the Type 212CD
The Stirling engine has greater safety than metal hydride FC [which releases flammable-explosive pure hydrogen].
(4) Availability of Fuel (Hydrogen and diesel): SAAB-DAMEN A26 superior to Type 212CD
This might be a Netherlands’ specific requirement [4, 5]. As the mission of a Walrus-class submarine is sometimes quite long (max. 3 month), reloading of fuel is required in remote areas [eg. the Dutch Caribbean, and Middle East. For Metal hydride FC, availability of hydrogen in remote areas seems to be difficult [6]. In comparison availability of diesel for a Stirling engine is no problem.
(5) Reliability of hull: SAAB-DAMEN A26 superior to Type 212CD
A base model of a Type 216 (which would strongly influence a large Type 212CD if required by the Netherlands) does not exist. Meanwhile a large SAAB-DAMEN A26 would presumably be based on the Collins-class which does exist and with proven hull and performance.
(6) Output of diesel: SAAB-DAMEN A26 superior to Type 212CD
The Type 212CD and a large SAAB-DAMEN A26 would be equiped with two and three MTU diesels respectively. The three MTUs-system of SAAB-DAMEN complements lower performance of Stirling engine.
(7) Job creation and technological contribution in Netherlands: SAAB-DAMEN A26 superior to Type 212CD
(8) Business situation of builder: SAAB-DAMEN A26 superior to Type 212CD
There is a rumor that of the parent company (Thyssen Krupp) will eventually sell TKMS.
(9) Product quality of builder: SAAB-DAMEN A26 superior to Type 212CD
TKMS was heavily criticized on bad quality – see [7, 8 below].
(10) Appropriateness for mission in hot and remoted area: SAAB-DAMEN A26 superior to Type 212CD
The inappropriateness of the TKMS 212A in hot and remote sea areas has been reported in the Netherlands [9 below]. These issues should be resolved in the tender of WRES. In the case of SAAB-DAME, experience of Collins-class in hot and remoted area is expected to be used.
ANONYMOUS CONCLUDES
On the basis of criteria (1) - (10) a large SAAB-DAMEN modified A26 appears to be superior to a large Type 212CD for the Walrus Replacement Program (competition).
REFERENCES
[1]“£2 billion Spanish navy submarine will sink to bottom of sea”, Fiona Govan, May/22/2013, The Telegraph, https://www.telegraph.co.uk/news/worldnews/europe/spain/10073951/2-billion-Spanish-navy-submarine-will-sink-to-bottom-of-sea.html
“A new submarine commissioned by the Spanish navy at a cost of 2.2 billion euros (£1.9billion) has been discovered to contain a serious design flaw – it is too heavy and will sink like a stone.”
[2]“Spain's new submarine 'too big for its dock'”, BBC, July/18/2018 https://www.bbc.com/news/world-europe-44871788
“The S-80 boat was redesigned at great expense after an earlier mistake meant it had problems floating, and it was lengthened to correct the issue.”
[3] The beams of the Type 212A (6.8m), Type 214 (6.3m) and A26 (6.4m) are considerably smaller than that of the Walrus-class (8.4m). The extension of beam means new design of hull, and it is very expensive and time-consuming work. The most effective extension method is diversion of existing hull design with bigger beam such as Type 216 (8.1m) and Collins (7.8m) and application of existing information and data such as strength calculation and hydrodynamics. The beam of the Type 216 and Collins is smaller than Walrus-class, capacity of the former two is bigger than that of the later where tear-drop shape and double hull structure are applied.
If displacement of the Walrus Replacement-new Netherlands submarine is ca. 3,000 tons, the length of the required larger Type 212CD and SAAB-DAME A26 will be ca. 65m, where ratio of length/beam is ca.8 closed to its ideal value of 7.
The availability and cost of fuel must be considered for the long-range, long-term submarine missions to the Dutch Caribbean Sea - which contains the overseas territories of Aruba, Curaçao, and Sint/Saint Maarten.
[5]“Marineschepen.nl” (Walrus class submarines : Operational deployment), Jaime Karremann, Feb/16/2019, marineschepen.nl,https://marineschepen.nl/schepen/walrus.html
[Long range] Deployment of Walrus-class submarines: the Persian Gulf, the waters around the Arabian Peninsula and the Indian Ocean, the Caribbean (max. 3months), the coast of East Africa, etc.
As maximum mission period of Japan's Soryu-class submarines is 70 days depending on food stock (the Collins-class is also the same), reloading of food and fuel and rest of crews are needed for a 3 month mission of a Netherlands’ submarine.
[6] Die Brennstoffzelle auf U 212 A, page22/24, 23/24, Sept/23/2008
In Europe, Gaseous or liquid hydrogen is carried by tank truck and is stored in cryogenic tanks in Europe. But, in remote areas, affordability of (gaseous or liquid) hydrogen is difficult. Liquid oxygen (oxidizer) is needed for both FC and Stirling engine, but, its affordability is not so great or difficult.
“The new, expensive high-tech submarines (212A class) should be the pride of the [German] Navy. But internal documents prove how breakdowns and deficiencies delay their use by years.”
Here, a range of problems regarding the Type 212A have been reported. “The engineer is annoyed above all that the manufacturer of the submarines, ThyssenKrupp Marine Systems in Kiel, apparently has learned nothing from the mistakes of the past.”
[8]“MKS 180 program : the master stroke of German Naval Yards”, Defence Chronicles, Aug/16/2018, https://www.defencechronicles.eu/mks180-program-the-master-stroke-of-german-naval-yards/
“Technical failures and bad management have inflated the costs and imposed significant delays to both programs, leading the German procurement authorities to oust them from the MKS 180 race.”
[9]“Marineschepen.nl” (Somali waters too warm and too far for German submarines), Jaime Karremann, Mar/14/2016, marineschepen.nl, see https://marineschepen.nl/nieuws/Duitse-onderzeeboot-niet-naar-Somalie-140316.html
“Last year, the German navy announced that a German submarine would go to Somalia to collect intelligence about pirates. After months of research, Germany has canceled the mission: the water around the Horn of Africa is too hot and the distance is too long for German submarines.”
Pete Comment - A third alternative, Naval Group, appears to be becoming a more serious contender in the Walrus Replacement Program (competition) - see further details later this week.
Anonymous (with some editing by Pete)