Durjoy-class patrol craft
{{Short description|Class of large patrol craft}}
| {{Infobox ship begin}}
{{Infobox ship image |Ship image= |Ship caption=BNS Nirmul }} {{Infobox ship class overview |Name= |Builders=*Wuchang Shipyard |Operators={{Navy|BGD}} |Class before= |Class after= |Subclasses=Keris-class littoral mission ship |Cost= |Built range=2011–present |In service range= |In commission range=2013–present |Total ships building= |Total ships planned= |Total ships completed=4 |Total ships cancelled= |Total ships active=4 |Total ships laid up= |Total ships lost= |Total ships retired= |Total ships preserved= }} {{Infobox ship characteristics |Hide header= |Header caption= |Ship class= |Ship type=Large patrol craft |Ship displacement=648 tons |Ship length={{convert|64.2|m|ft | abbr=on}} (overall)
|Ship beam={{convert|9|m|ft | abbr=on}}
|Ship height= |Ship draught={{convert|4|m|ft | abbr=on}}
|Ship depth= |Ship propulsion=* 2 x SEMT Pielstick 12PA6 diesels
|Ship speed= {{convert|28|kn|km/h}} (anti-surface warfare) {{convert|25|kn|km/h}} (Anti-submarine warfare) |Ship range={{convert|2500|nmi|abbr=on}} (anti-surface warfare) {{convert|2000|nmi|abbr=on}} (Anti-submarine warfare) |Ship endurance=15 days |Ship boats= |Ship complement=60 personnel (anti-surface warfare) 70 personnel (Anti-submarine warfare) |Ship sensors=
|Ship EW= |Ship armament=
|Ship aircraft= |Ship aircraft facilities= |Ship notes= }} |
The Durjoy class is a class of large patrol craft of the Bangladesh Navy. A total of four are serving the Bangladesh Navy as of 2021.
History
The Durjoy class is a class of large patrol crafts of the Bangladesh Navy, designed to meet the longer patrolling and surveillance needs in the vast EEZ of Bangladesh in the Bay of Bengal as well as to perform limited offensive roles. The ships of this class are of two variants, anti-surface warfare variant and anti-submarine warfare variant. The primary characteristics of the two variants are same but they differ in armaments and sensor suite.
Initially, a contract was signed in 2009 for two ships to be built at Wuchang Shipyard in China. The ships were of anti-surface warfare variant. The first, {{ship|BNS|Durjoy|2012|6}} (P 811), was launched on 26 August 2012, while the second, {{ship|BNS|Nirmul||6}} (P 813), was launched on 27 September 2012. Both ships arrived in Bangladesh in February 2013.{{cite news|url=http://www.daily-sun.com/details_yes_05-02-2013_China-built-warship-for-Navy-arrives-in-Ctg_400_1_10_1_8.html |archive-url=https://archive.today/20141124184500/http://www.daily-sun.com/details_yes_05-02-2013_China-built-warship-for-Navy-arrives-in-Ctg_400_1_10_1_8.html |url-status=dead |archive-date=24 November 2014 |title=China-built warship for Navy arrives in Ctg |work=daily sun |date=5 February 2013 |accessdate=2 February 2015 }} The ships were commissioned on 29 August 2013.{{Cite web|url=http://www.daily-sun.com/index.php?view=details&archiev=yes&arch_date=30-08-2013&type=&pub_no=600&cat_id=1&menu_id=1&news_type_id=1&news_id=136633|archive-url=https://web.archive.org/web/20151120005645/http://www.daily-sun.com/index.php?view=details&archiev=yes&arch_date=30-08-2013&type=&pub_no=600&cat_id=1&menu_id=1&news_type_id=1&news_id=136633|archive-date=2015-11-20|title=Daily Sun}}
On 30 June 2014 the Bangladesh Navy signed a contract for the next two Durjoy-class vessels with Khulna Shipyard. These ships were constructed in Bangladesh under ToT from China. Keel laying of the ships was done on 6 September 2015.{{cite news |url=http://www.bssnews.net/newsDetails.php?cat=0&id=517526&date=2015-09-06 |title=Keel Laying of two new warships at Khulna. |work=BSSNews |date=6 September 2015 |accessdate=6 September 2015 |archive-url=https://web.archive.org/web/20171015044402/http://www.bssnews.net/newsDetails.php?cat=0&id=517526&date=2015-09-06 |archive-date=15 October 2017 |url-status=dead }} The first two vessels made at Khulna Shipyard were commissioned on 8 November 2017.{{cite web|url=http://www.dhakatribune.com/bangladesh/2017/11/08/president-hamid-navy-ship-commissioning/| title=President Hamid commissions four new naval ships| publisher=The Dhaka Tribune|date= 8 November 2017| accessdate=9 November 2017}} These ships were of Anti-submarine warfare variant.
Design
These ships are {{convert|64.2|m}} long, {{convert|9|m}} wide and have a {{convert|4|m}} draught with a displacement of 648 tonnes. The ships have a bulbous bow shape, which suggests they are designed to sustain heavy sea states. The ships have speed and range to support long missions. The large patrol crafts are powered by SEMT Pielstick 12PA6 diesel engines driving three screws for a top speed of {{convert|28|kn}} for anti-surface warfare variant and {{convert|25|kn}} for anti-submarine warfare variant. The range of the ships is {{convert|2500|nmi}} for anti-surface warfare version and {{convert|2000|nmi}} for anti-submarine warfare version with an endurance of 15 days. The anti-surface warfare ships can carry 60 personnel while anti-submarine warfare ships can carry 70 personnel. They can carry one Rigid-hulled inflatable boat and has the support system to launch it.
=Electronics=
;Anti-surface variant
The primary sensor of these ships is a SR47AG surface and air search radar. The ship carries a Chinese TR47C fire control radar for main gun. The ships also have an ESS-3 bow mounted sonar with an effective range of about {{convert|8000|m}} for underwater detection. A JRCSS combat management system (CMS) with at least three multifunction consoles is also fitted in the ships.
;Anti-submarine variant
The primary sensor of these ships is a SR47AG surface and air search radar. They carries a Chinese TR47C fire control radar for main gun. For navigation, the ships use the Japanese JMA 3336 radar. To help the navigational radar, the Vision Master chart radar is used. These ships have an ESS-2B bow mounted sonar with an effective range of about {{convert|8000|m|yd}} for underwater detection.{{cite web|url=http://w3.khulnashipyard.com/index.php/2012-10-20-20-43-28/ongoing-works-in-khulna-shipyard/new-ship-building-in-khulna-shipyard/243-lpc|title=2*Large Patrol Craft|publisher=Khulna Shipyard|accessdate=16 September 2017|archive-url=https://web.archive.org/web/20170915204623/http://w3.khulnashipyard.com/index.php/2012-10-20-20-43-28/ongoing-works-in-khulna-shipyard/new-ship-building-in-khulna-shipyard/243-lpc|archive-date=15 September 2017|url-status=dead}}
=Armament=
;Anti-surface variant
The large patrol crafts of this variant are armed with a {{convert|76.2|mm|in|abbr=on|0}} H/PJ-26 naval gun and four C-704 surface-to-surface missiles (SSM) mounted aft. Besides, these ships have two dual Oerlikon 20 mm cannon mounted amidships which can be used for anti-aircraft role. For ASW role they have two forward-mounted 6-tube EDS-25A 250 mm ASW rocket launchers and decoy launchers.
;Anti-submarine variant
The ships of this variant uses a Chinese origin single {{convert|76.2|mm|in|abbr=on|0}} NG 16-1 naval gun as the primary gun. Besides, they have one CS/AN2 {{convert|30|mm|in|abbr=on|0}} single-barrel naval gun mounted amidships used as the secondary gun. For anti-submarine warfare role, these ships are armed with two triple {{convert|324|mm|in|abbr=on|0}} torpedo tubes for ET-52C torpedo. This torpedo has a range of 9.4 km and speed of 42 knots.
Ships in class
| class="wikitable" style="text-align: center;"
! style="background:#079;color:#fff;" | Pennant number ! style="background:#079;color:#fff;" | Name ! style="background:#079;color:#fff;" | Builder ! style="background:#079;color:#fff;" | Ordered ! style="background:#079;color:#fff;" | Launched ! style="background:#079;color:#fff;" | Commissioned ! style="background:#079;color:#fff;" | Status | |
| P 811
| {{BNS|Durjoy|2012|2}} | rowspan=2| Wuchang Shipyard | rowspan=2| 2009 | 26 August 2012 | rowspan=4|In active service | |
| P 813
| {{BNS|Nirmul | 2}}
| 27 September 2012 |
| P 814
| {{BNS|Durgam | 2}}
| rowspan=2| Khulna Shipyard | rowspan=2| 30 June 2014 | 29 December 2016 |
| P 815
| {{BNS|Nishan | 2}}
| 15 March 2017 |