|Builders:||American Shipbuilding Co / Norfolk Shipbuilding & Drydock Co, both USA|
|Operators:||Royal Thai Navy|
|General characteristics Following 1980s refit and rearmament|
|Length:||275 ft (83.8 m)|
|Beam:||33 ft (10.1 m)|
|Draft:||14 ft 1 in (4.3 m) (sonar dome)|
|Speed:||20 kn (23 mph; 37 km/h)|
|Range:||2,400 nmi (2,800 mi; 4,400 km) at 18 knots (21 mph; 33 km/h)|
|Complement:||15 officers, 120 enlisted|
Design and construction
In 1969, Thailand ordered from the United States a single small PF 103-class frigate, of which four examples, the Bayandor class, had been built for Iran in the 1960s, with a second example being ordered in 1971. For procurement purposes, they were allocated the US Navy hull numbers PF 107 and PF 108.
As built, single 3 inch/50 calibre Mk 34 automatic anti-aircraft guns were mounted fore and aft, each capable of firing 6.8 kg (15 lb) shells to a range of 13,400 metres (14,600 yd) at a rate of 45 rounds per minute, backed up by a twin Bofors 40mm/L60 mount. Two triple Mark 32 torpedo tubes for anti-submarine torpedoes and a Hedgehog anti-submarine mortar comprised the ships' anti-submarine armament. AN/SPS-6 air-search radar and SQS-17 sonar comprised the ships' sensor suite.
The first ship, Tapi, was commissioned on 19 November 1971, with the second ship, Khirirat, following on 10 August 1974. Both ships were modernised during the 1980s, with the US 3-inch guns being replaced by a rapid fire OTO Melara 76 mm gun forward, and a Bofors 40mm/70 gun aft, with two single 20 mm cannon replaced the existing twin Bofors mount. The obsolete Hedgehog was removed, and the ships were fitted with new radar and sonar systems.
|Tapi||American SB Co, Toledo, Ohio||1 April 1970||17 October 1970||1 November 1971|
|Khirirat||Norfolk SB||18 February 1972||2 June 1973||10 August 1974|
- Saunders 2002, p. 708.
- Gardiner and Chumbley 1995, p. 462.
- Baker 1998, pp. 870–871.
- Baker, A.D. (1998). The Naval Institute Guide to Combat Fleets of the World 1998–1999. Annapolis, Maryland, USA: Naval Institute Press. ISBN 1-55750-111-4.
- Friedman, Norman (1997). The Naval Institute Guide to World Naval Weapon Systems 1997–1998. Annapolis, Maryland, USA: Naval Institute Press. ISBN 1-55750-268-4.
- Gardiner, Robert; Chumbley, Stephen (1995). Conway's All The World's Fighting Ships 1947–1995. Annapolis, Maryland, USA: Naval Institute Press. ISBN 1-55750-132-7.
- Saunders, Stephen (2002). Jane's Fighting Ships 2002–2003. Coulsdon, UK: Jane's Information Group. ISBN 0710624328.
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