Regarding the installation method of pressure transmitters
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The recommended installation diagrams in the self-control installation manual show only the installation on process pipelines (gas, steam, liquid). All three recommended installation methods (sleeve type, socket weld type, butt weld type) involve a pressure-taking gate valve + pressure lead pipe + ball valve. So, does a pressure transmitter installed on a pressure vessel require a pressure conduit, or can it be installed directly on the top of the vessel? Can it be understood as the short installation on page P328?
Do you mean to remove the one-way valve? That definitely won’t work. Not to mention the regulatory requirements, but how can it be disassembled during actual maintenance?
It mainly depends on the medium; the design is tailored to the medium in question. It can be installed at the top of the container, and steam usually requires a cooler before pressure measurement is taken, but the root valve must be retained to facilitate disassembly and maintenance. In some cases, high temperatures of gases and liquids may also require the use of cooling tubes. The top of the container should preferably be installed with flanges.
Internal thread flanged globe valve + two-valve assembly + union fitting + transmitter
Pressure transmitters are installed on pressure vessels, and the installation method varies depending on the situation. 1. Installed at the top; in the absence of condensate, from bottom to top it can be the root valve, a pressure transition tube (about 10 cm long), and a pressure transducer. This situation can be considered as a direct installation, without the need for insulation. 2. Pressure measurement at the top: the transmitter is installed on a certain plane, and a root valve, pressure guide tubes, a pressure transducer, and an insulation box are required. Depending on the medium, a condensation tank or thermal insulation and heating may be required. 3. If it is a flanged connection, the cut-off valve and transmitter can be installed directly.