Weigh Module Selection: Check Assembly Height, Support Layout and Service Access

Weigh module selection can fail at installation even when the nominal capacity is adequate. A taller assembly may raise the vessel into rigid pipework; an inaccessible fastener may prevent correct installation; insufficient removal space can make a future sensor replacement impractical. Resolve these dimensions on the installation drawing before placing the order.

Start with a support survey, especially for a retrofit

Record the number and position of vessel supports, the available height at each support, upper and lower mounting footprints, anchor locations and access around the assembly. Include photographs with a scale, but use measured dimensions for fabrication. Note any corrosion, deformation, uneven elevation or damaged concrete that requires separate assessment.

Show connected pipework, ducts, platforms and cables on the survey. Identify which items move with the weighed vessel and which attach to the fixed structure. Raising one support to fit a new module can alter both the vessel alignment and the forces imposed by those connections.

Weigh module selection using the MV-WM0006 drawing

The METRAVON MV-WM0006 data divide the assembly into two capacity groups. The drawing identifies H as assembly height. Request the drawing for the quoted capacity and version rather than applying one group's envelope to the other.

The published height interval is not permission to adjust a loaded installation to any height within it. Confirm the assembly configuration, adjustment method where applicable and final dimension on the approved drawing. Likewise, matching a base-plate footprint does not establish that the load contact or upper fastening pattern is suitable.

The capacity group is not a recommendation for the whole vessel. Select each support from the calculated reactions, including uneven loading and credible operating cases. For that calculation and the effects of connected piping, use the separate tank weigh-module selection discussion. Do not divide maximum vessel weight equally among supports without checking the actual arrangement.

Resolve movement and restraint on the layout drawing

Give every support a position identifier. Where the chosen design uses different locating or movement functions, show those functions and their orientation on the plan. Follow the assembly supplier's instructions and the structural design; there is no universal fixed-and-floating layout that can be inferred from the product name.

Consider cold installation, normal operation and cleaning temperatures. Thermal movement should not force a module against its travel limit or pull a rigid pipe connection into the vertical load path. Check the available movement at both ends of the operating condition, not only when the empty vessel is cold.

Ask for specific drawings and ratings for any proposed lateral or anti-uplift restraints. The cited MV-WM0006 dimensional table does not establish those structural ratings. If the project needs wind, seismic or agitation-load verification, include that work explicitly in the design scope.

Plan installation release and later replacement

Before work begins, an appropriately qualified party must define how the vessel is isolated, supported and lifted. The measuring cell should not be used to pull a misaligned structure into position. Temporary supports, shipping restraints and any locking devices must be handled according to the approved procedure for the supplied assembly.

Keep bolt access, cable exit and sensor removal paths clear. Record the route by which a replacement part can be removed without cutting unrelated pipework or dismantling adjacent equipment. If the design requires lifting, provide a reviewed lifting arrangement rather than assuming a jack can be inserted later.

Once the structure is in its intended measuring condition, inspect the contacts and clearances and record individual sensor outputs where accessible. A large difference between supports can indicate uneven loading or installation problems; it should be investigated before electrical trimming is used to make the readings appear uniform.

Commission the installed arrangement, not only the instrument

Check zero return after loading and unloading, repeatability and the effect of normal process connections. Verify the working range using an agreed calibration method and document any part of the range not physically tested. Observe behavior during relevant valve, mixer or temperature changes before accepting the system for production.

Keep the final support layout, module identification, assembly heights, restraint settings and calibration records together. These provide a comparison after settlement, pipework alterations or cell replacement. For a priced selection review, submit the survey and load cases with a METRAVON enquiry; unresolved site work should remain a separate item in the quotation.

Installation questions

Q1. Can a taller module be fitted by shortening a support leg?

Not as an unreviewed field alteration. Changing a leg affects structure, elevation and connected equipment. Have the responsible designer assess the modification and issue an approved drawing before fabrication or lifting work.

Q2. Do all supports need the same model?

They need a coordinated arrangement with suitable reactions, heights and movement functions. Identical assemblies may be appropriate, but that conclusion must follow the layout design. Mixing heights or stiffnesses merely to use available stock can redistribute the load.

Q3. Why does the zero change after connecting the pipework?

The pipework may add vertical force or constrain movement. Compare readings before and after connection under controlled conditions and inspect alignment and independent pipe supports. A zero adjustment can remove the immediate offset without correcting a force that changes with pressure or temperature.

Q4. Can the mounting drawing be approved before the electronics are chosen?

Mechanical work can progress, but reserve the cable route, junction-box access and service space. Final acceptance still needs compatible electronics and a calibration method that meets the required net-weight measurement. Do not close the system specification at mechanical approval alone.

Summary

Approve the load capacity and installation drawing together. Assembly height, support geometry, controlled movement and replacement access determine whether the selected module can be installed and maintained. Resolve those constraints before modifying the vessel or committing to a purchase.