USS H-7

USS H-7 underway, c. 1922
History
United States
Name	H-7
Ordered	by the Imperial Russian Navy, 1915
Builder	British Pacific Construction and Engineering Company, Vancouver, Canada Puget Sound Navy Yard, Bremerton, Washington
Cost	$564,471.37 (hull and machinery) [1]
Laid down	15 May 1918
Launched	17 October 1918
Commissioned	24 October 1918
Decommissioned	23 October 1922
Stricken	26 February 1931
Identification	Hull symbol: SS-150 (15 July 1920) Call sign: NESJ
Fate	Sold for scrapping, 28 November 1933
General characteristics [2]
Type	H-class submarine
Displacement	358 long tons (364 t) surfaced 467 long tons (474 t) submerged
Length	150 ft 4 in (45.82 m)
Beam	15 ft 10 in (4.83 m)
Draft	12 ft 5 in (3.78 m)
Installed power	950  hp (710 kW) (diesel engines) 600 hp (450 kW) (electric motors)
Propulsion	Diesel/electric 2 × NELSECO diesel engines 2 × Electro Dynamic electric motors 2 × 60-cell batteries 2 × Propellers
Speed	14  kn (26 km/h; 16 mph) surfaced 10.5 kn (19.4 km/h; 12.1 mph) submerged
Range	2,300 nmi (4,300 km; 2,600 mi) at 11 kn (20 km/h; 13 mph) surfaced 100 nmi (190 km; 120 mi) at 5 kn (9.3 km/h; 5.8 mph) submerged
Test depth	200 ft (61 m)
Capacity	11,800  US gal (45,000 L; 9,800 imp gal) fuel
Complement	2 officers 23 enlisted
Armament	4 × 18 inch (450 mm) bow torpedo tubes (8 torpedoes)

USS H-7 (SS-150) was an H-class submarine originally built for the Imperial Russian Navy. Six of these were not delivered, pending the outcome of the Russian Revolution of 1917, before being purchased by the United States Navy, on 20 May 1918.

Design

The H-class submarines had an overall length of 150 ft 4 in (45.8 m), a beam of 15 ft 10 in (4.8 m), and a mean draft of 12 ft 5 in (3.8 m). They displaced 358 long tons (364 t) on the surface and 467 long tons (474 t) submerged. They had a diving depth of 200 ft (61.0 m). The boats had a crew of 2 officers and 23 enlisted men. ^[3]

USS H-4 - General Arrangement - NARA - 75841758

For surface running, they were powered by two New London Ship & Engine Company 475- brake-horsepower (354 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by two 170-horsepower (127 kW) Electro-Dynamic Company electric motors. They could reach 14  kn (26 km/h; 16 mph) on the surface and 10.5 kn (19.4 km/h; 12.1 mph) underwater. ^[3] On the surface, the boats had a range of 2,300  nmi (4,300 km; 2,600 mi) at 11 kn (20 km/h; 13 mph) and 100 nmi (190 km; 120 mi) at 5 kn (9.3 km/h; 5.8 mph) submerged. ^[4]

The boats were armed with four 18-inch (450 mm) torpedo tubes in the bow. They carried four reloads, for a total of eight torpedoes. ^[4]

Construction

H-7 was laid down on 15 May 1918, at the Puget Sound Navy Yard, she had been already been preassembled by the British Pacific Construction and Engineering Company, in Vancouver, Canada, for Imperial Russian Government, which had failed to exist in September 1917. She was launched on 17 October 1918, sponsored by Miss Julia Field, and commissioned on 24 October 1918. ^[2]

Service history

The submarine, attached to Submarine Division 6 (SubDiv 6), and later to SubDiv 7 (SubDiv 7), operated out of San Pedro, California, on various battle and training exercises with the other ships of her division. She also patrolled out of San Pedro, with interruptions for overhaul at Mare Island Navy Yard. ^[5]

Fate

H-7 reached Norfolk, Virginia, on 14 September 1922, having sailed from San Pedro, on 25 July, and decommissioned there on 23 October. Her name was struck from the Naval Vessel Register on 26 February 1931. She was sold for scrapping on 28 November 1933. ^[5]

References

1. Navy List 1921, p. 766.
2. Priolo & H-7.
3. Friedman 1995, p. 307.
4. Gardiner & Gray 1985, p. 128.
5. DANFS 2015.

Bibliography

• "Table 21 - Ships on Navy List June 30, 1919". Congressional Serial Set. U.S. Government Printing Office: 766. 1921.
• Priolo, Gary. "H-7 (SS-150)". Navsource.net. Retrieved 1 October 2025.
• Friedman, Norman (1995). U.S. Submarines Through 1945: An Illustrated Design History. Annapolis, Maryland: Naval Institute Press. ISBN   1-55750-263-3.
• Gardiner, Robert & Gray, Randal, eds. (1985). Conway's All the World's Fighting Ships 1906–1921. Annapolis, Maryland: Naval Institute Press. ISBN   0-85177-245-5.
• "H-7". Dictionary of American Naval Fighting Ships . Navy Department, Naval History and Heritage Command. 14 July 2015. Retrieved 1 October 2025. This article incorporates text from this source, which is in the public domain.

External links

• Photo gallery of USS H-7 (SS-150) at NavSource Naval History
• PigBoats.COM H-class page