Three 24,000-dwt specialty tankers have been ordered by the Stolt-Nielsen Group, it was announced by Per Ditlevsen, president of Stolt-Nielsen Chartering, Inc., New York, N.Y. These three tankers are in addition to four 17,600-dwt similar ships ordered last June. All seven ships will be built by Boelwerf N.V. in Temse, Belgium.

The increasing worldwide demand for an assortment of liquid cargoes require specialty carriers, according to Mr. Ditlevsen. Improved systems for pumping, stripping, cleaning and cargo segregation will be provided on the new ships together with stainless-coated and double-skinned tanks.

The actual construction contracts call for the sale of two 17,000-dwt ships to a subsidiary of Anglo Norness Ltd. and two to Per Victor Liljegren of Sweden. One of the two 24,000 tonners will be owned by Exmar N.V., Antwerp, Belgium and two by Jacob Stolt-Nielsen A-S of Norway. All will be time-chartered back to Stolt-Nielsen for 15 years.

At the same time, Mr. Ditlevsen announced the promotion of Carroll N. Bjornson, New York chartering vice-president, to manager of Stolt-Nielsen Japan. Palle S. Bistrup has been promoted to manager of services between U.S., Europe and Far East with offices in New York. Jan Stromsted has been named to supervise vessel operations in the same service.

Artist's conception of Stolt-Nielsen tankers designed for special liquid bulk cargoes.