When a quotation uses 15W4, 19W4 or a metric mesh label, ask the supplier to identify the catalog and drawing behind that designation. Record the exact label as quoted, then request the dimensions needed for your project review. Keep the designation and its documented meaning together in the purchasing file.
A grating spacing review should produce a drawing that the buyer, engineer and inspector can read without interpreting an abbreviation independently. If bidders use different naming systems, give them one comparison sheet and require the actual dimensions in a stated unit.
Request a plan view and bar section
Ask the supplier to label bearing bar pitch and cross-bar pitch separately. Require a dimensioned clear opening as well, with the measurement points shown. This avoids treating a quoted pitch and a clear opening as the same entry when reviewing competing proposals.
The section should identify bearing bar depth and thickness, the cross-bar form and any surface profile. Include the panel’s overall dimensions and bearing direction. For an I-bar proposal, request the section drawing rather than recording one thickness without stating where it is measured.
Keep finish and fabrication requirements in their own fields. A mesh designation in the first column should not leave the reviewer searching for the material, coating, edge banding or cut-out details elsewhere in the quotation.
Compare the documentation, not shorthand
Use a row for each submitted product designation. Beside it, record the manufacturer’s document reference, the dimensioned spacing, opening, bar section and panel construction. Ask the supplier to resolve any difference between the quotation, catalog and drawing before the engineer assesses the proposal.
For a hypothetical replacement enquiry, the maintenance record might say only “19W4 panel”. Treat that as a search reference. Survey the installed opening and supports, then request identification of the proposed replacement’s complete construction. Record any unconfirmed details as questions; copying the old label into a new order does not resolve them.
Keep the engineering decision visible
Attach the approved loading and support information when requesting product selection. Ask the engineer to review the actual proposed panel and its supporting evidence. Do not enter an assumed capacity into the comparison sheet because two proposals carry similar mesh names.
At drawing approval, establish which dimensions the inspector will check and what acceptance criteria apply. If a supplier changes its catalog reference during procurement, ask whether any dimensions or construction details changed with it. Put the answer into the revision record and retain the accepted drawing with the purchase order. The final record should identify an inspectable product, including the information hidden behind the original abbreviation.
