Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question dated 2020-09-15
Thread Content
Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-09-15: Discussion question: 236. If the ammonia pressure gauge on the ammonia tank is damaged, can a regular pressure gauge be used as a substitute? Why?
Because the Bourdon tube of the ammonia pressure gauge is made of a material resistant to ammonia corrosion, there is also a safety valve on the north side of the gauge. Ordinary industrial pressure gauges are not resistant to ammonia corrosion, and not all of them come equipped with safety valves; therefore, they cannot be used as substitutes. Gauge instruments designed for measuring the pressure of specific media, such as ammonia, oxygen, acids, etc., have distinct structural features and are marked with colors; therefore, they cannot be interchanged arbitrarily.
Because the Bourdon tube of the ammonia pressure gauge is made of a material resistant to ammonia corrosion, there is also a safety valve on the north side of the gauge. Ordinary industrial pressure gauges are not resistant to ammonia corrosion, and not all of them come equipped with safety valves; therefore, they cannot be used as substitutes. Gauge instruments designed for measuring the pressure of specific media, such as ammonia, oxygen, acids, etc., have distinct structural features and are marked with colors; therefore, they cannot be interchanged arbitrarily.
No, ordinary pressure gauges cannot withstand ammonia corrosion
Because the Bourdon tube of the ammonia pressure gauge is made of a material resistant to ammonia corrosion, there is also a safety valve on the north side of the gauge. Ordinary industrial pressure gauges are not resistant to ammonia corrosion, and not all of them come equipped with safety valves; therefore, they cannot be used as substitutes. Gauge instruments designed for measuring the pressure of specific media, such as ammonia, oxygen, acids, etc., have distinct structural features and are marked with colors; therefore, they cannot be interchanged arbitrarily.
No, ordinary pressure gauges are made of copper, and ammonia reacts chemically with copper to form copper-ammonia complexes. It poses a danger.
No, because ammonia reacts chemically with copper, corroding and damaging the pressure gauge.
Can’t； Ammonia pressure gauges are specialized instruments; contact with copper and copper alloys can cause an explosion ；
No, ordinary pressure gauges have a Bourdon tube made of copper.