Technical Explanations
The various hook ups are arranged as follows:
| Pressure measurement | |
| Pressure instruments mounted directly to the process line (PD) |
Pressure instruments mounted to racks or in enclosures etc. (PR) |
| Condition of fluid inside process line | |
| P D G 01 | P R L 01 | ||
| P | = Pressure | P | = Pressure |
| D | = Direct Mounting | R | = Remote Mounting |
| G L S |
= Gas = Liquid = Steam |
G L S |
= Gas = Liquid = Steam |
| 01 | = Consecutive Number | 01 | = Consecutive Number |
|
Condition of fluid inside process line |
liquid | gas | ||
|
Condition of fluid in elbow 90° / syphon |
liquid |
completely vapourized |
gas, partly condensed |
completely liquefied |
|
Hook up PD Pressure instruments mounted directly to the process line |
 |
 |
 |
 |
|
Condition of fluid inside impulse line |
lquid |
completely vapourized |
gas, partly condensed |
completely liquefied |
|
Hook up PR Pressure instruments mounted to racks or in enclosures etc. |
 |
 |
|
|
| Example | water | liquefied gas | humid gas | vapour |
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