She was built as a replacement for the dilapidated JDSFushimi. In terms of design, it is said to be an expanded and improved version of the submarine rescue mother ship JSChiyoda, and while abolishing the submarine mother ship function, it is strengthening medical equipment.[1]
For DSRV operation, the basic configuration of having a moon pool in the center of the hull is the same as the 56AS, but the poop deck has been extended to the vicinity of the bridge structure, and the standard displacement has been increased by 1,800 tons. As a result, the equipment that was previously stored in the exposed part can now be accommodated inside the ship. In addition, attention was paid to high-speed cruising ability so that the vessel can quickly advance to the distress site, a bulbous bow was adopted to reduce wave-making resistance, and a ship bottom closing device was installed at the bottom of the center well. This is a method of opening and closing the closing plate divided into two by hydraulic pressure, and structures such as a sliding type and an inward opening type were examined, but due to the certainty required for the mission of rescue, the double door method by opening outward was adopted.
The main engine is equipped with two Mitsui Engineering & Shipbuilding 12V42M-A diesel engines. This is the same series as the in-line 8-cylinder engine that was the main engine in Chiyoda, but the output was increased by using a V-type 12-cylinder engine. As a propulsion device, in addition to two variable pitch propeller axes, two side thrusters are provided on the bow and stern. Like Chiyoda, they are equipped with a dynamic positioning system (DPS), which allows them to stand still at a point on the ocean.
Construction and career
Chihaya was laid down on 13 October 1997 at Mitsui Engineering and Shipbuilding, Tamano and launched on 8 October 1998. The vessel was commissioned on 17 March 2000.
The government, which received a request from Ehime Prefecture to search for survivors of the Ehime Maru incident that occurred on February 10, 2001, requested the Defense Agency respond. Chihaya began searching in August 2001.[2][3]
The ship participated in the International Submarine Rescue Training Pacific Reach 2002 held in April 2002. In addition to successful operations despite stormy weather, the DSRV succeeded not only in its originally planned soft mate (arrival at the sunken submarine), but also in its hard mate (opening the hatch, more practical rescue training). At this point, the transport helicopter MH-53E Sea Dragon had succeeded in landing training.
In May 2008, a member of the explosives disposal corps on board set a record of 450 metres (1,480ft) in depth due to saturated diving, setting the second highest (at that time) record in the world after 534m (1,752ft) in France.
In response to the Great East Japan Earthquake caused by the Tohoku-Pacific Ocean Earthquake that occurred on March 11, 2011, the ship was dispatched off Sanriku as part of the disaster relief. Chihaya was engaged in this duty from June 26 to July 3.
From July 13, 2018, she provided support in response to the flooding in July 2018.
Related Research Articles
A deep-submergence rescue vehicle (DSRV) is a type of deep-submergence vehicle used for rescue of downed submarines and clandestine missions. While DSRV is the term most often used by the United States Navy, other nations have different designations for their vehicles.
A submarine rescue ship serves as a surface support ship for submarine rescue and deep-sea salvage operations. Methods employed are the McCann Rescue Chamber, Deep Submergence Rescue Vehicles (DSRV's) and deep sea diving operations.
The Type 7103 deep-submergence rescue vehicle (DSRV) is a submarine rescue submersible of the People's Liberation Army Navy (PLAN) of the People's Republic of China (PRC).
JS Hyūga (DDH-181) is the lead ship of the Hyūga-class helicopter destroyer of the Japan Maritime Self-Defense Force (JMSDF).
JS Ise (DDH-182) is a Hyūga-class helicopter destroyer of the Japan Maritime Self-Defense Force (JMSDF). It is the second ship to be named Ise, the first being the Imperial Japanese Navy World War II-era battleship Ise.
JS Chiyoda was a submarine rescue ship of the Japan Maritime Self-Defense Force.
JS Yaeyama (MSO-301) was the lead ship of the Yaeyama-class minesweepers of the Japanese Maritime Self-Defense Force. She was commissioned on 16 March 1993.
JS Fuyuzuki (DD-118) is the fourth ship of Akizuki-class destroyers. She was commissioned on 13 March 2014.
JS Kumano (FFM-2) is the second ship of the 30DX frigate of the Japan Maritime Self-Defense Force (JMSDF). She was named after Kumano River and shares her name with a World War II heavy cruiser Kumano and Cold War destroyer escort Kumano.
JS Kurobe (ATS-4202) is a training support ship of Japan Maritime Self-Defense Force.
JS Setogiri (DD-156) is an Asagiri-class destroyer of the Japan Maritime Self-Defense Force.
JS Chiyoda (ASR-404) is a submarine rescue ship of Japan Maritime Self-Defense Force.
JDS Fushimi (ASR-402) was a submarine rescue ship of Japan Maritime Self-Defense Force.
JDS Chihaya (ASR-401) was a submarine rescue ship of Japan Maritime Self-Defense Force.
JS Hamayuki (DD-126) was a Hatsuyuki-class destroyer of the Japanese Maritime Self-Defense Force.
JS Uraga (MST-463) is the lead ship of Uraga-class mine countermeasure ship.
JS Natsushio (SS-584) was the second ship of the Harushio-class submarine of Japan Maritime Self-Defense Force.
JS Arashio (SS-586) was the fourth ship of the Harushio-class submarine of Japan Maritime Self-Defense Force.
JS Fuyushio (SS-588) was the sixth ship of the Harushio-class submarine of Japan Maritime Self-Defense Force.
JS Asashio (SS-589) was the seventh ship of the Harushio-class submarine of Japan Maritime Self-Defense Force.
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