Frequently Asked Questions

1. What are the differences between working pressure, test pressure and burst pressure?

NAHAD (National Association of Hose and Accessories Distributors) and EJMA (Expansion Joint Manufacturers Association) calculations are used to derive theoretical burst pressure. Industry standard, ASME Boiler and Pressure Vessel Code, Standard Code for Pressure Piping, etc., recommend a 4:1 safety factor for maximum working pressure.
Mann-Tek have chosen a higher safety factor: 5:1 (the working pressure is 1/5 of the burst pressure).
The maximum test pressure is 1.5 times the maximum working pressure.

2. How can I check what materials are compatible with the media I am using?

Click here for a Chemical Resistance Chart, and here for a Sealing Material Chart. There are also other chemical compatibility guides and other useful links below.

DuPont Chemical Resistance Guide >> 
Chemfinder >>
Chemical Compability >>
Elastomer Chemical Compatibility Chart >>

3. Where can I track my shipments?

Click on your freight company below.

DHL | UPS | TNT | Schenker

4. Are you able to design or produce spe

We are always pleased to look at special requirements and a large proportion of our production results from such work. Please contact us with as much information as possible and we will gladly come back to you.

5. Where is my nearest source of your products?

We have a comprehensive network of distributors throughout the Europe, USA and other parts of the world. Please contact us for more info.

6. Can I purchase products on this site?

If you wish to order product, please contact us so that we can provide a quotation for you.

7. What is the interchangeability for the DACouplings?

The DACouplings is compatibel with other existing brands according to NATO STANAG 3105, ISO 45, and MS 24484.

8. What does the measurements on the DDCouplings stand for?

9. How can I avoid mixing the wrong products?

To avoid product contamination caused by connecting a hose unit to the wrong tank unit, selective versions of the hose and tank units are available.

Each unit has a number of selective positions, designated by a coded part number according to the coupling size - specify when placing order. Click here for more information >>

10. What is Teflon®?

Teflon is a resin discovered by E.I. Dupont in the late 1930:s, but was not commercially developed until after WWII. It is now extruded or molded by its licensees. Teflon® is a trade name for several different kinds of flouroplastics, all of them having in common extreme chemical resistance as well as a higher heat range than other plastics. In addition Teflon does not seem to decompose the way other plastics and synthetic rubbers do, no shelf life has yet been determined for Teflon®. Some Teflon® items have been in service for over 30 years without any signs of deterioration. A few of the most common formulations are PTFE a.k.a. polytetrafluoroethylene, PFA a.k.a. perfluoroalkoxyl and FEP a.k.a. Fluorinated Ethylene Propylene.

"Teflon" is a registered trademark of E.I Dupont Corporation.

  « Back