News

A small project...

Steel thickness 25 mm - Plate rolling and multiple layer welding

01 June 2023

Series of pressure vessels...

Ready for transport

20 May 2023

Cyclone in stainless steel 321H

Cyclone in stainless steel 321H according to AD2000.

30 April 2023

SAW = Submerged Arc Welding in the background

SAW is a relatively high speed and high quality welding process. One pass can weld a relatively thick plate.

Want to know more about it? Take a look on our site.

20 April 2023

Rolling of large metal plates

Rolling of large metal plates.

For more information check our website.

25 March 2023

Under pressure...

Pressure vessel / sump tank being hydro tested.

Vessel acc to ASMEVIII div 1 + PED 2014/68/EU

Do you want to know more about different types of NDT? Check our website

11 March 2023

Chocolate tanks

Large stainless steel chocolate tanks, ready for transport.

Up to 50 tonnes...

Per tank of course.

For more information, look on our website.

29 January 2023

Pressure vessel according to Vlarem

Pressure vessel in stainless steel 316 according to ASMEVIII + PED + Vlarem.

Ready for transport

15 January 2023

Work in progress... Hydrotest of a pressure vessel

A hydrotest / hydro pressure test / hydrostatic test is among others a standard NDT (Non Destructive Test) and involves filling the pressure vessel with water to test for strength and leaks.

Do you want to know more about different types of NDT?

Check our website.

13 October 2022

Work in progress...

Half pipe welded vessel.

Half pipe jacketing is used to control the temperature in a vessel or boiler and to get or maintain it at the appropriate level and is an alternative for double-walled vessels.

15 September 2022

Deprest and sustainability

Sustainability is a key value at Deprest.

We naturally try to apply this value at company level like everyone else by, among other things

- generating our own energy as much as possible by means of solar panels

- limiting our energy consumption

- sorting our waste – in this respect Deprest is obviously fortunate with its waste flow, since most of our waste (metal scrap) is 100% recyclable.

In addition to these traditional ways of contributing to sustainability, the projects we work on are very often intended for sustainable projects. We regularly manufacture parts for wind farms, we make sump tanks for ships (where all waste is collected, while in the past it was simply dumped into the sea). As many of our tanks are used to make processes cleaner, we also contribute indirectly to a better, more sustainable world.

03 May 2022

Filter Baskets in the spotlight

The purpose of this article is to put the production of industrial filters (which are often small pressure vessels) and more specifically associated filter baskets in the spotlight.

As a rule, these filter baskets need to be very sturdy given the flow rates, pressures (and the occasional less gentle treatment by technicians) they have to withstand. This means that, notably when assessing quotations, you should make sure that you are ‘comparing apples with apples’, so to speak.

The difference between a light and a sturdy basket version can, for example, determine whether it can be used for just 6 months or last for years.

25 October 2021

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