One of Vulcan’s more interesting–if not necessarily most profitable–business partnerships was with the Nilens concern in Belgium. This page outlines the company and its product line.
Note: We have extensive technical information available on the Nilens product line, especially the diesel hammers. Click here if you would like to contact us about this.
When Vulcan began to deal with Charles Nilens S.P.R.L., they were located in Vilvorde (Vilvoorde) at 52, Avenue de la Station. Vilvorde is north of Bruxelles (Brussels); it is the same city where William Tyndale, the first person to translate the Bible directly from the Greek and Hebrew into English, was executed for his activities in 1536. In the late 1960’s Nilens secured new offices at 7-14 Houtemstraat in Peuthy (Peutie), also in Vilvorde, and were then known as Materiel Nilens (MANIL) S.A.
Vulcan’s first agreement with Nilens came in June 1963, where Nilens agreed to be Vulcan’s distributor in the then European Common Market’s six countries: the Netherlands, Belgium, Luxembourg, France, and West Germany. In September of the same year the two companies signed an arrangement whereby Nilens would manufacture under license the Vulcan product line. At the time Nilens’ managing director was Jean Willy Nilens. Vulcan also distributed portions of Nilens’ product line in the U.S., as will be described below.
The early years of the relationship were exciting, with numerous trips to Europe by Vulcan executives (complete with silly questions by travel agents) and with a visit by a Belgian prince to Palm Beach.
Nilens for its part made a few Vulcan hammers under license, but the predominance of diesel hammers in Europe made the appeal of air/steam hammers limited.
The Product Line
Nilens’ product line broke down into four parts:
- Single-acting diesel hammers, from Vulcan’s standpoint, the most important part of Nilens’ product line. Nilens produced three single acting diesel hammers:
- N33, with a ram mass of 1250 kg and a rated energy of 3125 kg-m
- N46, with a ram mass of 1800 kg and a rated energy of 4500 kg-m
- N60, with a ram mass of 2400 kg and a rated energy of 6000 kg-m
- “T” series double-acting air/steam hammers (left), similar to the MKT “B” series machines (9B3, 10B3, 11B3). These were primarily intended for installing sheet piling.
- Impact pile extractors, held together using a cable wrap system (right). They were a superior extraction machine to Vulcan’s extractors, albeit more complex and expensive.
- Pile driving rigs, with leader mast and carriage. This is more typical of European manufacturers (Junttan is a good modern example of this.)
Three of these are described below.
Nilens Diesel Hammers
Operation of Nilens Single-Acting Diesel Hammers
|The piston, which in fact is the ram, is raised by the trip mechanism, which is attached to the hoist line. Air enters the cylinder as the piston uncovers the exhaust ports. When the trip mechanism makes contact with the cam, the piston is released automatically. The trip mechanism continues up until it is arrested and held by a spring loaded dog.
Diesel hammers are generally either of a cast construction (like the current Delmag hammers and their progeny) or fabricated (as with the Russian diesels or MKT.) Nilens (along with the older Delmags) was something of a hybrid; an iron ram rode in tubular steel cylinders, with a cast “sleeve” complete with cooling fins fabricated into the hammer around the combustion chamber. When Vulcan designed its own diesel hammers, it went to a cast lower cylinder, with uninspiring results.
|The piston falls due to gravity and depresses the cam, which actuates the fuel pump. The fuel pump injects a measured amount of fuel oil into the concave top of the anvil.
The Nilens’ fuel pump was unique in that it used an internal cam/plunger instead of the external type common on Delmag and other fuel splash delivery systems. It was not a positive displacement pump either; it was a pressure compensated one, with fuel entering (and excess fuel returning) through a needle valve in the top of the pump. When manufactured properly, the pump worked well, but manufacturing and design variations were the chief weaknesses of an otherwise good diesel hammer.
|The piston blocks the exhaust ports as it continues to fall. The cylinder is now a closed chamber, between the piston and anvil, and compression builds up. The convex end of the piston strikes the fuel oil in the top of the anvil and sprays it up into the hot compressed air in the compression chamber, which causes it to ignite. The resulting explosion drives the piston up and adds to the energy already delivered to the anvil by the impact of the piston. The piston uncovers the exhaust ports on the upstroke, permitting the exhaust gases to escape and fresh air to enter the cylinder for the next cycle. To lubricate the piston and cylinder wall, oil is automatically ejected from the reservoir in the top of the piston. The anvil is lubricated by four grease fittings.|
Nilens “T” Series Double Acting Hammers
Nilens Pile Extractors
Vulcan was able to sell and rent a number of Nilens diesel hammers in the U.S.; some of them were operational for many years. They ended up outlasting the company itself. In 1976 Willy Nilens fled to Spain; the company went into receivership, the product line was acquired by Intermat, and the Nilens concern passed into history.