Questions regarding the wiring method for instrument measurements
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Customer requirement regarding the pressure tap tubes for instrument measurement: Use imported tubes in imperial specifications, with a 1/2” OD; the connection for the instrument measurement wires shall be of the double ferrule type. What does dual-card sleeve connection mean? Could you give an example?
This post was last edited by jujiangliu on 2017-9-8 at 19:49. It refers to dual-collar fittings, which have 2 collars; they are imported collar connectors, and most of them are of the dual-collar type.
The bayonet connection method is specified in the standard HG/T21581-2012; you can check it yourself
What are the advantages and disadvantages of dual-casing fittings compared to single-casing fittings?
Double card sleeves are generally made of stainless steel, while single card sleeves are made of alloy copper; single card sleeves are cheaper, but their nuts tend to crack.
It has nothing to do with the material, right? Single card holders can be made of copper or steel.
Dual mechanical seals ensure good sealing performance and minimize leakage.
In my understanding, a \"dual mechanical seal\" has two sealing surfaces, which means that sealing material is used in two places. Since sealing material is a flexible substance, it can compensate for any displacement of the sleeve; excessive displacement of the sleeve can lead to leaks as well as damage to the material. This helps to ensure better sealing performance. I wonder if that’s the case?