SS Freshspring specifications

Built in 1946, SS Freshspring was intended to carry 236 tons of water to warships as well as provide limited assistance in firefighting and salvage operations if needed. When she was discovered lying on the Severn estuary she was remarkably intact. Here’s a bit about what we found when we delved below deck.

SS Freshspring Specifications

image of SS Freshspring


  • Length overall 126 ft 6 ins (38.5m)
  • Length between perpendiculars 120 feet (36.5m)
  • Beam 24 ft 6ins (7.5m)
  • Draft 10 ft 9 ins (3.3m) max
  • Between 0.3” (7.6mm) and 0.26” (6.6mm) thick
  • 289 gross registered tons (293.6 tonnes)
image of Historic ship SS Freshspring


A single boiler of the scotch return tube type. It has three furnaces and is 13 feet (4M) diameter and 10 feet (3M) long. The working pressure is 180 psi (12.4bar) Air is preheated before entering the furnaces.  A Sisson powered centrifugal fan is provided to assist in providing air to the furnaces.

This was originally coal fired with three coal grates using some 4 tons of coal in 24 hours. The  grates were replaced during the life of the ship with three heavy oil burning furnaces. These use steam pressure to atomise the oil.

The oil system was provided by The Wallsend Slipway & Engineering Company using their own Wallsend-Howden patent system.

photo of SS Freshspring volunteers

Main Engine

A triple expansion reciprocating engine of 21 inch (0.53M) stroke with cylinders of 11 18 and 30 inches diameter. (0.28 0.46 0.76 m) It produces 450 indicated horsepower (335.6KW) at 170 RPM.

The engine is fitted with steam reversing gear to change the engine from ahead to astern. A rocking lever from the crosshead drives the air pump, feed pump and bilge pump.

The engine exhausts into a condenser returning water back to the system.

Maximum speed is 9.5 knots and the propeller is cast iron and 6ft 10 inches diameter (2.08 M)

image of SS Freshspring


Fitted with a steam steering engine by Donkin & co Ltd. There are two steering wheels one for use with the engine and one for manual control. The system is known as rod and chain as chains from the engine lead to the deck where rods linked to chains on the rudder provide control.

image of Historic ship SS Freshspring

Water Tanks

205 tons (208.3 tonnes) of fresh water carried in two pairs of forward tanks, 88 tons (89.4 tonnes) in the forward tanks and 102 (103.6 tonnes) in the aft tanks, accessed via four hatches in the foredeck, then two tanks aft of the engine room of 46 tons (46.7 tonnes) each.

photo of SS Freshspring volunteers

Accommodation and Crew

  • Captains cabin
  • Officers accommodation aft
  • Galley on above deck aft
  • Lamp room, paint store, showers and washroom in the forepeak


Electric Generator

Robey powered 10KW 110volt DC Clarke Chapman generator.


Boiler Feed Pump

By Dawson and Downie, 2 inch (0.05m) pump 10 1/2 inch (0.27m).


Forced Draft Fan

W Sisson & Co. Ltd of Gloucester, 3 1/2 inch (0.09m) by 2 1/2 inch (0.06m) stroke turning a 26 1/2 inch (0.67m) fan.

Condensor Circulation Pump

Condenser circulating pump is centrifugal and by Drysdale of Glasgow.


Bilge and Ballast Pump

By Dawson and Downie, 2 inch (0.05m) pump 10 1/2 inch (0.27m).



The anchor windlass is a twin cylinder unit by Gemmell and Frow Ltd

Fire and Salvage Pump

Fire and salvage pump is centrifugal and by E.N Macklay & Co.


Main Cargo Pump

All reciprocating pumps are by Dawson Downie with the main cargo pump having a capacity of 900 gallons (4,091 litres) per hour.

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