Harry Evans was built and classed to Lloyd's Register of Shipping notation: +100 A1 Tug, Fire-fighting Ship 1 with waterspray, + LMC, UMS.

This version of the RAmparts 3000 tug design is 30.25m in length overall with a beam of 11.00m and maximum draft of 4.85m. The hull form incorporates a fairly large �escort skeg� to enhance the indirect towing capability of the tug. Although this design is not considered an aggressive escort tug, the skeg will enable the execution of very effective indirect manoeuvres and also provide enhanced seakeeping and directional stability.

The tank capacities were tailored to the specific requirements of the client, accommodating the following; 78 m³ of fuel oil, 26 m³ of potable water, 3.75 m³of sewage and 7.0 m3 of oily bilge water.

For propulsion a pair of CAT 3516 B diesel engines, each rated 1,685 kW at 1,600 rpm, drive Rolls-Royce model US 205 azimuthing propulsion units via Twin Disc slipping clutches and a straight line shaft system. On acceptance trials this combination delivered a bollard pull of 56 tons ahead, 53 tons astern, and a free running speed of 12 knots.

The Harry Evans is outfitted for a crew of six persons in very comfortable quarters. In addition to a very spacious mess/lounge area the tug has a large combination switchboard room and office on the main deck, enabling the engineers to maintain watch without being subjected to the continuous noise of the engine room. On entry into the deckhouse through the aft bulkhead, there is a generous wet room which includes wash-up and laundry facilities, as well as wet gear storage. From the same lobby area, the engine room can be accessed, thus providing a useful noise barrier between the machinery space and the accommodation.

The main winch forward, supplied by Kraaijeveld is of the split drum, hydraulic type, with each partition accommodating 110m of 80mm synthetic towline. An aft towing winch deploys a 220m of steel wire towline through large aft bitts, which also support a 55 ton SWL radial arm tow hook. The towing outfit is completed by a set of hydraulic tow pins built into the aft bulwarks.

The tugs are rated for a full FiFi 1 notation, with two main engine driven pumps rated 1,200 m3/hour each, supplying water to a pair of remote controlled monitors forward. Fire fighting foam compound is also an option, with 5,000 litres of foam compound carried in a dedicated stainless steel tank.