Hi Level Track members. A pleasant day.
My current project use a pad-type flange connection for Level DP on tanks and exchangers.
My concern is the reliability of pad-type flange to withstand pressure and leakage. And will this affect the installation of my transmitter? And does it require additional consideration?
Thanks in advance for your help.
Hello,
Your instlalation should be able to withstand your operating pressure as long as you are within the pressure limits of your flange spec as documented in your local standard (such as ANSI B16.5, EN 1092-1, JIS B2238, etc.) These standards will tell you what the Maximum Working Pressure (MWP) is for a given flange type and operating temperature. Operating temperature needs to be considered, because the MWP for a flange class is de-rated at higher temps. Typically the transmitter (with attached flange / seal) should have the same flange class as what is on the vessel. For example, if your vessel has an 3-in. ANSI Class 150 flange, you should use a transmitter and seal with a 3-in ANSI Class 150 flange.
With regards to preventing leaking, you will need to use a gasket between the flange on your vessel and the transmitter & seal. Being the gasket will likely come in contact with the process, you will need to ensure the gasket material is compatible with the process and can withstand the operating temperature as well.
Michael