|
Title: |
Piping and Valves |
Doc. No. |
L-001 |
Annex |
C |
EDS |
NSS1 |
|
Project: NORSOK |
Company: |
Rev.Date: |
20.09.99 |
Rev: |
1 |
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ELEMENT DATA SHEET FOR SOFT SEAT MATERIALS.
The below listed seat materials are the NORSOK requirements for soft seat materials. It is the purchaser/manufacturers choice to select between alternatives listed.
Use of other materials in standard Norsok valves is not allowed unless it can be documented that the properties is compatible with the requirements specified in below table.
|
Seat material |
MDS |
Applicable pressure classes & temperature range. |
Additional information/ limitations |
|
Polytetrafluoroethylene (PTFE) |
150 - 300 lb. / -46 to 150° C. |
Mechanical properties of the material are reduced by increasing temperature. |
|
|
Polyetheretherketone (PEEK) |
150 - 900 lb. / -46 to 150° C. 1500-2500 lb./ -46 to 120° C |
Mechanical properties of the material are reduced by increasing temperature. |
|
|
Polyetheretherketone (PEEK) with 10-20% Polytetrafluoroethylene (PTFE) |
150 - 900 lb. / -46 to 150° C. |
Mechanical properties of the material are reduced by increasing temperature. |