Our team

Arnold den Boon

  • Electrical engineer
  • 25 years experience with maritime electrical contractrors
  • 15 years experience in shipbuilding
  • Rietschoten & Houwens, Alewijnse, Pon and IHC

André Kik

  • Naval architect
  • 30 years experience in dredging industry
  • Experience/responsibility dor TSHD & self-propelled dredgers in sales, design & cost estimation at Royal IHC

Marcel Boor

  • Mechanical engineer
  • 30 years experience in dredging industry
  • Royal IHC, Royal Van Oord
  • Design & cost estimation CSD, TSHD and other dredging equipment

Meindert Zwanenburg

  • Mechanical engineer
  • 25 years experience in dredging industry
  • Royal IHC, local dutch dredging simulator
  • Design & cost estimation of CSD and dredging systems

Cees Wim van Noordenne

  • Legal
  • Investor

Our history

Bucket dredger Hendrik built at the Zuilen yard.​

Around 1900, the Sliedrecht brothers Arie, Eliza and Jacob van Noordenne set up a repair shop in Zuilen to repair the equipment they used in their dredging and contracting work. After a number of years, the construction of new equipment also took place here, and a shipyard was created where the first ship was launched at the end of 1906. The shipyard was named after the nearby Fort De Klop.

The shipyard grew somewhat out of the hands of the brothers, and a more extensive basis was sought with a friendly relationship, which resulted in a conversion into a public limited company in 1911, with the participation of Gerrit-Jan Bos, contractor in Sliedrecht. The technical and practical management was in the hands of Huib(ert) van Seventer. In 1915 the decision was made to move the company to Sliedrecht: closer to the owners and the most important clients and because there were no expansion options in Zuilen. De Klop subsequently fell into the hands of W J Kalis Wzn & Co’s Baggermaatschappij, the Van Noordenne brothers and other parties withdrew.

The original founders and owners also wanted to continue to have their own workshop for their equipment, and so the Kraayeveld & Van Noordenne company, together with the Bos contractor family, decided to set up such an institution again in 1918, a few hundred meters further along the Merwede, below the name NV Shipyard and Machine Factory Kerkerak. In 1919, Kerkerak and De Klop were united into a company, under the leadership of the aforementioned Van Seventer, now with the original founders largely as shareholders and clients. In the first year the company had 214 employees. Over the years, Kerkerak’s equipment was transferred to De Klop, an operation that was completed in 1932.


The 1920s were quite profitable. In addition to dredging and tug boats, sea-going vessels were also built in the first years. The number of employees rose rapidly to 412 in 1921, after which a decline began. Like many shipyards, employment fluctuated widely, ranging from 370 in 1930 to around a hundred in 1933. In 1939, an adjacent site was acquired with a view to expansion. Which became effective in 1945. In the post-war period, De Klop also benefited from the flourishing of prosperity and Dutch shipbuilding, partly under the banner of the partnership with other Dutch Shipyards.

In 1965, five yards working together within IHC merged, including De Klop. De Klop survived the subsequent restructuring within the Dutch shipbuilding industry. In 1983, a new combined yard of De Klop and IHC subsidiary Van Rees was established and the combined company continued as IHC-Sliedrecht.

Around 2018 the shipbuilding activities were relocated from Sliedrecht and IHC IQIP was relocated to the IHC Sliedrecht Yard facilities. IQIP was sold in 2023 by Royal IHC. In the same year DE Klop BV was established in Sliedrecht by Cees-Wim van Noordenne, a descendant from the previously mentioned van Noordenne family. DE Klop BV has its offices almost at the same location as where it started in Sliedrecht more than 100 years ago.

Two 1100 bucket ladder dredgers under construction.