DESMI Proven Technology 1

DESMI Proven Technology 3

DESMI Proven Technology 2

DESMI Proven Technology 4

DESMI Proven Technology 5

Cases


Polyurethane Foam/Isocyanate

Polyurethane Foam/Isocyanate

Isocyanate is one of the components in broadly all foam products, such as foam mattresses, inner liners in cars, cushioning in car seats, chairs, and sofas. The hard qualities are used for insulation of houses, machines, tubes, etc. As a matter of curiosity we can also mention the green foam in which flowers for decorations are stuck.

There are various types of isocyanate, but common to all of them is that they react to the humidity of the air, thus forming very hard crystals which wear the pumps and the mechanical shaft seals, if any.
There are different methods to avoid that the humidity of the air gets into the storage tank:

The tank is provided with a sili-cagel filter which absorbs the humidity from the air as the tank is emptied and air is sucked into the tank, so that it is not flat-tened out.

At the top of the storage tank a protecting layer of gas (nitrogen) is added.  Similarly the tanker which brings the raw material, has got gas at the top of the tank.

When filling the tank, the tanker pumps the liquid into the storage tank, the top of which is connected to the top of the tanker. In this way no air at all gets into the isocyanate, and there is no exhalation into the environment.

Instead of using nitrogen ultra-dry air can be used. There are air-dryers which totally remove the humidity.

Systems pumping isocyanate should be provided with a filter or a strainer so as to avoid crystals, if any, to circulate the system constantly.

All isocyanates are hazardous, and the vapours should not be inhaled.  Contact with the skin gives discolora-tion of the skin, and prolonged contact may result in allergy reactions.

Mechanical shaft seals
Through the ages all kinds of seals have been used, from soft shaft seals to double mechanical shaft seals with DOP (dioctylphthalate) or mesamol under pressure between the seals.  The results have been very mixed, but the risk of running into problems has been so big that it can only be recom-mended to implement these so-lutions if the customer himself takes the responsibility for the solution desired.

The only solution we can give our whole-hearted support is to use a MAGNETICALLY COU-PLED pump.

Selecting bearings
Our first selection would be bronze bearings. Some isocyanates, however, contain additives which do not go well with bronze, so this solution must be rejected.
   The next thing we can do, is to put carbon bearings into the pump. But, if there are crystals in the isocyanate, carbon bearings will not be the solution. Therefore carbide bearings will be the only solution.

Normally the viscosity varies from 10 to 200 cSt.

The first magnetically coupled pump for isocyanate has been running non-stop for 10-12 years now.

Pump selections:
ED…E-1U22 or
ED…E-1U33 or  - 1U88.
 

 

 

Related cases


To the top

Join DESMI at ISH China & CIHE 2020, 11-13 May

ISH China & CIHE – China is an International Trade Fair for Heating, Ventilation, Air-Conditioning, Sanitation & Home Comfort Systems taking place May 11-13 2020 in Beijing, China at the New China International Exhibition Center

I’m interested. Tell me more

Join DESMI at Maritime Industry Gorinchem, 13-15 October 2020

The Maritime Industry exhibition is taking place May 13-15 October 2020 in Gorinchem, Netherlands at the Evenementenhal Gorincham

I’m interested. Tell me more

Join DESMI at the Irish Skipper Expo, 4-5 September 2020

The Irish Skipper Expo is taking place September 4-5 2020 in Limerick, Ireland at the UL Sport Arena

I’m interested. Tell me more

Join DESMi at AquaCulture UK 2020, 18-20 May 2021

Aquaculture UK is the most important aquaculture exhibition and conference held in the British Isles taking place 18-20 May 2021 in Aviemore, Scotland at the Macdonald Aviemore Resort

I’m interested. Tell me more

Join DESMI at CHEMUK 2020, May 13-14

The UK's chemical industries supply chain expo is taking place September 16-17 2020 in Stretford, United Kingdom at the Eventcity Limited

I’m interested. Tell me more

Join DESMI at Asia Pacific Maritime, 30 Sept. - 02 Oct. 2020

Asia Pacific Maritime (APM) is a premier exhibition and conference in Asia showcasing a complete overview of the many vessel sectors taking place March 18-20 in Singapore at the Marina Bay Sands

I’m interested. Tell me more

Join DESMI at Euronaval 2020, 20-23 October

The world naval defense exhibition taking place October 20-23 2020 in Paris, France at Paris Le Bourget Exhibition Centre

I’m interested. Tell me more

Join DESMI at Posidonia 2020, 26-30 October

The International Shipping Exhibition taking place October 26-30 in Athens, Greece at the Metropolitan Expo

I’m interested. Tell me more

Join DESMI at Sea Trade Maritime 2020, 7-9 December

Find DESMI at stand no G31, at the largest maritime event and conference in the Middle East taking place December 7-9 2020 in Dubai at the New Dubai Exhibition Centre.

I’m interested. Tell me more

We use cookies to enhance our website and improve your experience of it. If you say no to cookies, our website will still function, but it may result in diminished functionality.

OK