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English to English translations [PRO]
Tech/Engineering / Heat Pump Installation Instructions | | English term or phrase: DN 20 | | an approved safety valve of at least DN 20 with an opening pressure of max 1,5 bar |
| | | DN 20 refers to a specific (nominal) flange size | Explanation:
Again,
DN plus a number identifies a specific flange size
It is a nominal size, ie the number is "only loosely related to manufacturing dimensions", as explained in
www.georgefischer.co.uk/malltechnical.pdf:
The concept of nominal size (DN) is now used to designate the size of a particular pipeline. It is defined in ISO 6708 as a numerical designation of size which is common to all components other than components designated by outside diameters or thread size. It is a convenient round number which is only loosely related to manufacturing dimensions. Nominal size is designated by the letters DN followed by a number. This number is the approximate bore diameter measured in millimetres
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| Selected response from:
 Maurizio Valente
Italy
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3 mins confidence:   peer agreement (net): +1
2 hrs confidence: peer agreement (net): +1 DN 20 refers to a specific (nominal) flange size
Explanation:
Again,
DN plus a number identifies a specific flange size
It is a nominal size, ie the number is "only loosely related to manufacturing dimensions", as explained in
www.georgefischer.co.uk/malltechnical.pdf:
The concept of nominal size (DN) is now used to designate the size of a particular pipeline. It is defined in ISO 6708 as a numerical designation of size which is common to all components other than components designated by outside diameters or thread size. It is a convenient round number which is only loosely related to manufacturing dimensions. Nominal size is designated by the letters DN followed by a number. This number is the approximate bore diameter measured in millimetres
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