News

Construction and insulation of a tank

These pictures are showing the different steps in the construction an isolution of a tank.

09 September 2021

Perfect welding in the spotlight

There is welding and... welding. Look closely at the welds in the attached photo: perfect work, isn’t it? Whether the process used is manual welding as shown in this photo, or submerged arc welding, plasma keyhole welding, automatic or semi-automatic welding – to name but a few – not only do our welds always look impeccable; various NDT testing methods such as RX, MT, and more, also confirm it.

How come Deprest’s welding is of such high quality?

25 June 2021

Sump tank

A sump tank is a holding tank where all the waste produced at sea is collected. The waste that used to be simply discharged into the sea is now collected and brought ashore without polluting.

This sump tank is double walled (stainless steel and steel) and built according to standards EN12285-2 - ASME VIII - EN 1993-4.It also complies with finishing standard P3.

No, your eyes are not deceiving you: this tank has a diameter of 3200 mm and a length of 15500 mm.

04 May 2021

Ready to leave the building

In the attached photo you will find a stripping column acc to ASME VIII div. 1 cat. IV manufactured in SA-215 Gr60.

After we made a similar column in 2016 our satisfied costumer ordered a second this year.

20 February 2021

Aluminium structure

In the autumn Deprest contributed to an artistic project, which consisted in an aluminium structure for a major show.

The structure involved one large central ring with a diameter of 8 metres and 4 hinged metal legs.

Watch the video to get a good feel of what went on in our workshop. It also demonstrates how the articulations of the structure were tested.

28 June 2020

PQR database

Obviously, skilled people and state-of-the-art machinery are the beating heart of a company, and, fortunately, Deprest has both.

Yet, the many PQRs accumulated by Deprest over the years are another asset that shouldn't be underestimated in our sector.

(W)PQR stands for (Welding) Procedure Qualification Record and is a standardised procedure for welding certain materials, positions and thicknesses as a certified workshop. Welding Procedure Specifications (WPS) are supported by the PQRs.

The approval of a PQR is done by and under the supervision of an external inspection body and can quickly reach a cost of 3,500 euros or more per qualification, not including the company's own costs (such as joint preparation and welding time). Considering that, as a workshop, Deprest has over 100 PQRs, you do the math...

31 March 2020

Pressure vessel in the spotlight

Appearances can be deceptive: this pressure vessel was rather complex

The specifications are:

• 25 bar

• 1000 litres

• manufactured to EN13445 standard

• compliance with PED2014/68/EU CAT IV mod G

The complexity of the project stemmed from the customer’s requirement to be able to look into the pressure vessel at any height. Deprest resolved this problem by placing three sight glasses at three different levels.

26 March 2020

Submerged Arc Welding (SAW)

SAW welding - Submerged Arc Welding

Various names for the same process.

This is an automated arc welding process, which involves feeding a wire, just like with an electrode, but in which the coating of the electrode is replaced by a protective powder. The machine applies a blanket of granular fusible material on the work just before the welding process, and sucks it up again once it is completed.

It is a very powerful welding process, also allowing high welding speeds. It is especially suitable for longitudinal and circumferential seams, especially when multiple passes are necessary.

23 January 2020

Welding job of thick sheets - up to 100 and 200 mm

While most of the welds laid in our workshop are between 6 to 10 mm and 20 to 30 mm, some welds are well above that. We can also weld plate thicknesses from 150 to as much as 200 mm. If a continuous weld is required, it goes without saying that a great many welding layers are necessary.

We can never afford mistakes, so you understand that the quality of the welds is all the more important. Imagine that RX testing performed on such a welded joint reveals welding defects deep inside...

28 December 2019

Submerged Arc Welding (SAW)

SAW welding - Submerged Arc Welding

Various names for the same process.

This is an automated arc welding process, which involves feeding a wire, just like with an electrode, but in which the coating of the electrode is replaced by a protective powder. The machine applies a blanket of granular fusible material on the work just before the welding process, and sucks it up again once it is completed.

It is a very powerful welding process, also allowing high welding speeds. It is especially suitable for longitudinal and circumferential seams, especially when multiple passes are necessary.

04 December 2019

New! Plasma keyhole welding derrick

Our new plasma keyhole welding derrick has been installed and initial tests look promising!

The welding derrick uses the same technology as our existing plasma keyhole welding installation, but has an automatic clamping system with integrated backing and cooling so that a flat or centred plate no longer needs to be spot welded, and just needs to be clamped together before welding.

Flat sheets thus remain straight and flat during welding; the machine produces a perfect continuous weld (for stainless steel, within a range of 2 to 10 mm) in one single pass and works at a very high speed. 

07 October 2019

Aluminium structure

In the autumn Deprest contributed to an artistic project, which consisted in an aluminium structure for a major show.

The structure involved one large central ring with a diameter of 8 metres and 4 hinged metal legs.

Watch the video to get a good feel of what went on in our workshop. It also demonstrates how the articulations of the structure were tested.

30 June 2019

Another pressure vessel has left the building

It’s not suprising to see a pressure vessel leaving Deprest. We at Deprest are specialized in pressure vessel. Each week some vessels – large or small – leave the site. Our pressure vessels are made in steel, stainless steel and special alloys. We elaborate and follow projects from A to Z, inclusive technical calculations, design, testing, complete execution, and the testing and follow-up of the necessary inspections.

05 October 2018

Plate filters

Deprest regularly makes plate filters. A unique feature of our plate filters is that they can be retightened during the filtering process, without releasing the pressure or interrupting the process.

09 April 2018

Large ducting project

The attached photos show part of a large ducting project recently welded by Deprest.

Given the application (gas at a temperature of 600°C will flow through these pipes), the end customer had set extremely high quality requirements.

09 March 2018

Chocolate tank

Here's an interesting video found on the Internet/YouTube:

11 December 2017

Skilled professionals

Deprest has spent several years installing cutting-edge technology and equipment.

Ever since 2013 when we added a new building, we have equipped ourselves with the latest technology in the areas of cutting, rolling and welding, and our new building has even been extended because it was too small. Notwithstanding all this new technology, we wouldn’t have gotten where we are without skilled professionals.

16 September 2017

New pickling hall

Our new pickling hall was put into use in the autumn of 2016.

03 July 2017

Deprest has invested in a new heavy-duty profile bending machine

In the context of the workshop expansion, Deprest has invested in a new heavy-duty profile bending machine, of the Sahinler HPK 100 type. This new bending machine allows us to significantly expand our capabilities.

This machine will be used for our own production, but also for subcontracting projects.

13 June 2017

New PED regulation

After more than 10 years, a new Pressure Equipment Directive (PED) recently came into force, PED 2014/68/EU, which replaces the former 97/23/EU.

This applies to all pressure vessels which are sold on the European market after 19/07/2016. It goes without saying that Deprest will apply the new regulation.

It would take us too long to explain all the differences here, but feel free to contact us should you have any questions.

14 April 2017