A replacement conveyor belt should not be reordered from belt width, one faded marking or an old invoice line alone. When the original datasheet is missing, build a controlled replacement record from three sources: existing documents, the physical belt, and the conveyor's actual operating conditions. Mark every field as confirmed, observed, assumed or unknown. Ask the supplier to restate the proposed construction and every open assumption before production.
Conveyor belt rolls with visible wrapping and roll-face markings. These clues can support identification, but they do not replace the original datasheet or a confirmed order specification.
Two belts can share the same width and nominal strength while differing in carcass construction, top and bottom cover thickness, cover grade, edge construction, splice basis or special resistance. If procurement compares only a short code or total price, suppliers may quote different products under apparently similar descriptions.
The objective is not to guess the old belt perfectly from appearance. The objective is to collect enough reliable information to identify what is known, expose what is still unknown and agree a replacement specification that the buyer, supplier and installer can all review.
Start with existing records, then inspect the belt and conveyor, and finally add the operating history. One source rarely gives the complete answer. An invoice may omit cover details. A visible marking may be incomplete. A site measurement may reflect a worn belt rather than its original condition.
Illustration. Build the replacement specification from records, visible belt evidence and the actual conveyor duty.
Source | Useful information | Main limitation |
Existing records | Purchase orders, quotations, drawings, technical datasheets, inspection records and maintenance notes | The document may be old, incomplete or based on a previous conveyor condition |
Physical belt | Readable marking, belt width, total thickness, edge, surface, profile, splice and visible damage | Appearance does not prove hidden carcass construction, cover grade or original thickness |
Conveyor and duty | Material, route, belt speed, pulleys, take-up, loading, temperature, oil, moisture, impact and failure history | Operating data may be spread across maintenance, engineering and production teams |
Ask procurement, maintenance and engineering for the last purchase order, supplier quotation, belt drawing, technical datasheet, installation or splice record, inspection reports and any stored belt sample. Compare the dates and machine reference. A correct document for another conveyor is still the wrong reorder basis.
If more than one specification appears in the records, do not choose the newest or cheapest automatically. Record the conflict and ask which belt is currently installed. Maintenance notes can also show whether the last belt was an approved design change or only an emergency replacement.
Photograph every readable marking before cleaning or cutting the belt. Record the exact characters, spacing and location rather than rewriting them from memory. ISO 433 covers conveyor belt marking, but an operating belt may have worn, partial or manufacturer-specific markings. A visible code can support identification; it should not be expanded into unverified construction or performance claims.
If the marking shows a rating, remember that rating alone is not a complete specification. The replacement review should also confirm belt width, order length, top and bottom cover thickness, cover grade, conveyed material, application, quantity and required standard. Steel cord belt review should also include available cord, pulley and splice information.
Visible roll face and belt surface can support condition and geometry review. Appearance alone does not confirm carcass construction, cover grade, original cover thickness or performance.
Measurements must be taken by qualified site personnel under the site's isolation and safety procedure. Never measure, touch or photograph a moving belt from an unsafe position. Record the measuring tool, location and whether the belt was tensioned, relaxed, installed or removed.
Field | Recommended record | Do not assume |
Belt width | Measure across several accessible positions and record any damage or edge loss | One damaged edge represents the original ordered width |
Total thickness | Measure representative accessible areas and identify worn or repaired locations | Total thickness reveals the original top and bottom cover thickness |
Top and bottom cover | Use a reliable prior record or a properly prepared cross-section or sample where available | External appearance confirms the individual cover values |
Carcass and strength | Use readable marking, approved records or supplier-supported sample review | Colour, stiffness or ply appearance alone confirms the rating |
Length | State the measurement method and distinguish installed loop length, endless net length and open order length | Conveyor centre distance or an old invoice length is the final manufacturing length |
Splice and edge | Photograph the splice and both edges; identify the required supply condition | The old splice design is automatically suitable for the replacement |
Profile or attachments | Record pattern, cleats, sidewalls, holes or other visible features with a scale | A product name alone defines every geometry and tolerance |
ISO 251 specifies widths and lengths for textile-carcass conveyor belts and notes that belt lengths are not standardized. ISO 16851 addresses determination of the net length of an endless spliced textile conveyor belt. These references reinforce a practical procurement point: the buyer must state the length basis and measurement method instead of sending one unexplained number.
A useful photo set connects close-up details to the full conveyor. Include a wide view of the route and loading zone, every readable marking, both belt surfaces, both edges, the splice, and the damaged or worn area. Add a ruler or known reference where it can be used safely. Keep confidential labels, people and unrelated customer information out of the public article or supplier pack unless authorized.
Illustration. Useful views include the conveyor, belt marking, edge, both surfaces, splice and damage area.
A like-for-like reorder is not always the safest decision. The old belt may have been correct, modified, temporarily substituted or mismatched to a changed duty. Describe the conveyed material, normal and abnormal operating conditions, belt speed, conveyor inclination, loading arrangement, drop height, pulley information, take-up arrangement and environment where available.
Record why the belt is being replaced. Gradual top-cover wear, edge damage, cracking, delamination, splice deterioration, repeated mistracking or impact damage lead to different questions. A failure photo does not prove the cause by itself. Use it to define what the supplier and site team need to investigate.
Status | Meaning | Example |
Confirmed | Supported by an approved record or agreed measurement | Width measured at three positions and checked against the prior drawing |
Observed | Visible but not yet verified as an original specification | A partial marking or visible splice type |
Assumed | Used temporarily for quotation and clearly assigned to an owner | Supplier assumes a cover basis pending sample confirmation |
Unknown | No reliable information is currently available | Original top-cover thickness cannot be recovered from the worn belt |
Do not turn an unknown into a typical value merely to make the RFQ look complete. A quotation can state an assumption, but the final order specification should show how that assumption was confirmed, revised or accepted.
Illustration. Keep unknowns and supplier assumptions visible until one final order specification is approved.
· Conveyor or equipment identification and installation location
· Existing belt photos, readable marking and any available sample
· Belt width, length basis, quantity and required supply condition
· Known carcass type, strength or rating, with source identified
· Top and bottom cover thickness, or an explicit unknown status
· Cover grade or required resistance, supported by the real material and environment
· Conveyed material, lump size, moisture, oil exposure and temperature where relevant
· Belt speed, route, inclination, pulley and take-up information where available
· Splice method, installer responsibility and requested preparation
· Reason for replacement, failure location and operating history
· Required inspection, documentation, labeling, packing and delivery interface
· List of assumptions that must be closed before production
Mistake | Risk | Better control |
Using an old invoice line as the full specification | Important construction or operating details may be missing | Reconcile the invoice with the installed belt and current duty |
Copying only the rating or ply count | Cover, length, edge, splice and application requirements remain undefined | Compare the complete specification and open assumptions |
Treating worn total thickness as original cover thickness | The replacement may be based on a damaged or reduced section | Identify the measurement condition and use a reliable record or sample review |
Using centre distance as order length | Installation, take-up and splice requirements may be omitted | State the length basis and have site personnel confirm the final value |
Assuming the old belt failed only because of belt quality | Loading, alignment, splice, pulley or operating changes may be missed | Review the failure pattern and conveyor condition before repeating the order |
Accepting quotations with hidden assumptions | Prices may represent different products and responsibilities | Require each supplier to restate construction, exclusions and confirmation points |
Ask each supplier to restate the interpreted belt specification in one controlled table. Compare width, length basis, carcass or rating, cover construction, cover grade, special resistance, edge, splice preparation, quantity, documentation, packing and unresolved assumptions. A lower price may reflect a different technical or commercial scope rather than a like-for-like saving.
For fields that cannot be verified before quotation, require a clear hold point before production. That hold point might be an approved drawing, a reviewed sample, a final site measurement or written acceptance of a defined assumption. The responsible party and deadline should be visible.
GRAND RUBBER can review an available belt marking, photos, records and operating information to help organize a replacement conveyor belt RFQ. The review can identify missing fields and prepare a clearer basis for discussing fabric or steel cord conveyor belt options. Final construction, dimensions, standard, documents and splice scope remain subject to the confirmed order specification and project requirements.
Related product references: fabric conveyor belts and steel cord conveyor belts. For joint terminology, see the conveyor belt joint and connection guide.
Usually not. A readable marking can support identification, but the RFQ should still confirm width, length basis, cover construction, application, quantity, splice scope and any special operating condition.
Not safely by itself. The installed belt may be worn, repaired or compressed, and total thickness does not separate the top cover, carcass and bottom cover. Use approved records or a suitable sample or cross-section review where available.
No. Centre distance is only one conveyor dimension. The order length depends on the full belt path, pulley arrangement, take-up position, splice or endless basis and any agreed installation allowance.
Keep it marked as unknown. Provide the marking, belt and splice photos, conveyor data and operating duty. The buyer, supplier and installer should agree the verification route before production.
Not automatically. A like-for-like replacement may be suitable when the old specification and duty remain valid, but repeated failure or changed operating conditions should trigger a review before reordering.
Send the available belt marking, width, length basis, quantity, photos, conveyed material, reason for replacement and any prior document. Clearly identify unknown fields instead of filling them with guesses.
· ISO 14890:2026 covers general-use textile conveyor belt specification and includes purchaser enquiry information.
· ISO 433:2017 addresses conveyor belt marking.
· ISO 251:2024 covers textile-carcass belt widths and lengths and notes that lengths are not standardized.
· ISO 16851:2012 covers determination of the net length of an endless spliced textile conveyor belt.
Send the available belt records, marking photos, measurements and operating condition to info@grandrubbers.com. Keep unknowns visible so the proposed replacement specification can be reviewed before quotation and production.
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