Glossary |
Boiler and boiler tube industry terms and their definitions.
|
|
Search for entries. |
|
View Glossary |
|
| P |
| Pages: 1 |
| Passivate | The changing of the chemically active surface of a metal to a much less active state by the application of the proper chemical treatment or by applying an induced electrical current and voltage for cathodic or anodic protection form corrosion. An example of chemically passivating stainless steel would be to immerse stainless in a hot solution of approximately 10 to 20 percent by volume nitric acid and water. |
| | |
| Photomicrograph | A photographic reproduction of an object magnified more than ten times used to show microstructure characteristics of steel. |
| | |
| Physical Properties | "Those properties not specifically related to reaction to external forces. These include such properties as density, electrical resistance, co-efficient of thermal conductivity." |
| | |
| Pickling | "Use of solutions, usually acids, to remove surface oxides form a tube, may also be used to produce a desired surface finish." |
| | |
| Piercing | A seamless tubemaking method in which a hot billet is gripped and rotated by rolls or cones and directed over a piercer point is held on the end of a mandrel bar. |
| | |
| Pit | "A sharp, usually small, depression in the surface of metal." |
| | |
| Porosity | Unsoundness caused in cast metals by the presence of blowholes or shrinkage cavities. |
| | |
| Pressure Tubing | Tubing produced for the purpose of containing or conducting fluids or gases under pressure. |
| | |
| Profilometer | An instrument used for measuring surface finish. The vertical movements of a stylus as it traverses the surfaces are amplified electromagnetically and recorded (or indicated) as the surface roughness. |
| | |
| Proof Stress | "The load per square inch of the original cross-sectional area which, when removed, has caused a permanent elongation not exceeding a defined amount (usually 0.0001"""" per inch of gage length). A test of this type is more commonly used in Europe than in this country, where it largely has been replaced by yield strength measurements." |
| | |
| Pyrometer | An instrument of any of various types used for measuring temperatures. |
| | |
|
|
