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Radar flange installation can stall even when the instrument flange has the expected nominal size. The mating face, bolt pattern, gasket arrangement and available fasteners may not form a compatible joint. Resolve the complete joint before delivery so the installer is not forced to improvise with whatever parts are on site.
Define the radar flange installation as a complete joint
| Part | Identify | Owner |
|---|---|---|
| Instrument | Flange standard, rating, face and material on the approved drawing | Supplier confirms the offered assembly |
| Tank nozzle | Actual mating dimensions, condition and process duty | Site verifies the installed connection |
| Gasket | Type, material and dimensions required by the joint design | Purchase scope names who supplies it |
| Fasteners | Specified grade, dimensions and assembly procedure | Installer receives the approved parts and instructions |
Nominal diameter is only one identifier. The radar connection guide covers the choice between threaded, flanged and bracket mounting; the checks here concern the supplied flange joint. A pressure class or drilling pattern cannot be inferred from a photograph, and a gasket should not be selected only because its outside diameter fits. The joint design must account for the actual medium, temperature, pressure and connected materials.
Check what comes with the radar
METRAVON MV-RD902 is a 26 GHz liquid radar with selectable horn sizes and process-temperature configurations. Obtain the drawing for the ordered combination. Do not assume the generic product image identifies the exact flange, gasket, mating flange or bolts included in the quotation.
Ask the packing list to distinguish the instrument assembly from loose accessories and site-supplied items. If a gasket is supplied, its identification should agree with the approved joint requirement. Any substitute needs review before installation, particularly where it changes seating or material compatibility.
Avoid solving fit problems with force
Inspect the mating faces and available clearance after safe isolation. The assembly should seat as designed without pulling misaligned parts together using the bolts. Do not enlarge holes, stack unapproved gaskets or modify the horn to make the instrument fit.
Fastener tightening values and sequence depend on the approved joint and gasket arrangement. This article provides no universal torque because a value suitable for another flange can damage the connection or leave it inadequately sealed. Use the manufacturer's and site's approved assembly instructions.
Separate joint acceptance from level commissioning
Complete the required mechanical inspection and any specified integrity checks before introducing the process. Then commission the level measurement against the installed reference position. A leak-free joint does not establish a clear radar path, and a correct level reading does not prove the joint is suitable for pressure service.
Site questions
Q1. Can the old gasket be reused because the radar has the same flange size?
Do not assume reuse is acceptable. Its condition, construction and the approved assembly procedure must be reviewed; the purchase scope should provide the required replacement where applicable.
Q2. Who should specify the bolt torque?
The responsible joint-design or installation authority, using the actual flange, gasket and fastener details. A general radar catalogue cannot supply a valid torque for every mating installation.
Summary
Confirm the entire mounting joint and its supply responsibility before site work. Request an MV-RD902 connection drawing and accessory list with the tank-nozzle details so missing or incompatible parts are resolved before shutdown.
