Choose the supply form only after confirming how the belt will be measured, transported, brought into the conveyor, joined and accepted. An open belt is supplied in one or more open lengths and must be joined before operation. An endless belt is supplied as a closed loop, but it may still contain a factory-made splice and may require conveyor dismantling for installation.

Neither option is automatically better. The correct choice depends on the belt construction, conveyor arrangement, access route, available joining resources, shutdown plan and the commercial scope agreed with the supplier.

Conveyor belt production and finished belt material shown for manufacturing context. The photograph does not define the ordered supply form or joint method.

What do open and endless mean in an RFQ?

In an RFQ, open supply means the ordered belt is delivered as an open length or as several open lengths. The final loop is created during installation. The buyer therefore needs to define the ordered manufacturing length, any installer-approved splice allowance, the number of pieces, the planned joining method and responsibility for the joint.

Endless supply means the belt is delivered as a closed loop with an agreed circumference or length basis. Do not assume that endless means splice-free. Depending on the belt and manufacturing method, the loop may include a factory-prepared joint. The RFQ should still identify the construction, joint arrangement, dimensional basis and acceptance requirements.

Illustration. Simplified supply-form comparison; not a product drawing or installation instruction.

Quick comparison for buyers

This table is a purchasing comparison, not a universal design rule. Final selection remains specific to the belt and conveyor.

1. Start with the conveyor and installation route

The first question is not “Which option is stronger?” It is “How will this belt physically reach its operating position?”

Review the complete route from unloading to installation:

•  unloading point and available lifting equipment;

•  door, shaft, platform and structural clearances;

•  turning space for the roll or folded loop;

•  access to head, tail, bend and take-up pulleys;

•  guards, drives, frames or pulleys that can or cannot be removed;

•  available space for a vulcanizing press, fastener tools or clamping equipment;

•  pull-in direction and safe working area.

A closed loop may look convenient because the joint is completed before delivery, but it can be impractical if the conveyor frame cannot accept it without dismantling. An open belt may be easier to pull through the conveyor, but it transfers critical joining work to the site. The site team should confirm which installation sequence is actually executable.

2. Confirm that the belt construction and joint plan match

The words open and endless do not define the splice method. The joint plan must be reviewed against the actual belt construction and operating duty.

Provide the full belt marking or an approved datasheet, including width, strength designation, carcass or reinforcement type, number of plies where applicable, top and bottom cover thickness, cover grade, edge type and any profiles, sidewalls, cleats or other special features.

Then state the proposed joint method and who is responsible for confirming it. Hot vulcanized, cold bonded and mechanical joint options have different equipment, material, preparation and application limits. This article does not select a splice method because that decision requires the exact belt, conveyor duty and installer procedure.

For supplier comparison, ask each bidder to state:

•  the proposed supply form and joining assumption;

•  whether splice materials or fasteners are included;

•  whether belt-end preparation is included;

•  whether installation, supervision or inspection is excluded;

•  which documents or acceptance records can be provided for the quoted scope.

This prevents a belt-only offer from being compared as if it included a complete site installation service.

3. Separate every length value

Do not use “belt length” as one undefined number. At least four values can appear in the same project:

1. conveyor centre distance;

2. calculated or measured operating loop length;

3. ordered manufacturing length;

4. splice or installation allowance.

These values are related but not interchangeable. Centre distance alone does not describe the full path around the pulleys. An old invoice may not reflect later conveyor modifications. A removed belt may include repairs, previous cuts or service-related dimensional changes. Treat historical values as references until the responsible technical parties approve the manufacturing basis.

Record the take-up type, take-up reference position and available travel when the measurement is made. Also identify whether the requested endless dimension means inside circumference, neutral-line length or another agreed method. The purchase order should use the same definition as the approved drawing or measurement record.

Illustration. Shows why centre distance, loop length, ordered length and splice allowance must be recorded separately. Not to scale.

4. Check transport, roll size and handling before fixing the supply form

Supply form affects more than installation. The belt must also fit the transport and handling plan.

Confirm the maximum acceptable roll diameter, roll width, gross weight, core or reel arrangement, lifting points, packing method and unloading capacity. If the belt must be split into several rolls, record how many additional joints this creates and who accepts the revised installation plan.

For an endless loop, confirm how it will be folded or packed without damaging the belt and whether the packed dimensions can pass through the site route. For an open belt, confirm whether the required length can be shipped as one roll or needs separate pieces.

Multiple conveyor belt rolls secured in steel transport frames. Packing design, roll dimensions and handling limits must be confirmed for each order.

5. Match the decision to the shutdown and site resources

An open-belt plan is incomplete until the site confirms the people, tools, materials and time available to make and inspect the joint. An endless-belt plan is incomplete until the site confirms the closed loop can be installed within the same shutdown and access limits.

Before order release, name the responsible party for:

•  method statement and site safety controls;

•  belt pulling, clamping and tension release;

•  splice or fastener materials;

•  press, power, tools and consumables;

•  trained installers and supervision;

•  joint inspection and acceptance record;

•  conveyor reassembly, tracking and restart approval;

•  contingency action if the supplied dimension or access plan is incorrect.

The available shutdown window is an input, not proof that the work can be completed within that time. The responsible installation team should approve the sequence and resources.

6. Use a decision sequence instead of a one-line preference

The following sequence helps prevent an early commercial choice from becoming a site problem:

Illustration. Procurement decision sequence only; final engineering and site approval remain required.

1. Identify the belt. Confirm the construction, dimensions, covers and special features.

2. Verify the length basis. Record the conveyor, loop, manufacturing and allowance values separately.

3. Review access and handling. Confirm the route, lifting limits, roll or folded-loop dimensions and dismantling restrictions.

4. Assign joining responsibility. Define method approval, materials, equipment, installer, inspection and exclusions.

5. Approve the supply form. Release open or endless supply only after technical, site and commercial scopes agree.

Situations that may point toward each option

These are prompts for review, not automatic recommendations.

Open supply may deserve closer consideration when:

•  the conveyor frame does not allow a closed loop to be fitted easily;

•  the belt must be pulled through a long or restricted route;

•  the site already has an approved joining procedure and qualified resources;

•  shipping or handling limits require the belt to be divided into controlled lengths.

Endless supply may deserve closer consideration when:

•  the loop can be transported and installed without unacceptable dismantling;

•  the final circumference can be measured and approved reliably;

•  the agreed belt construction can be joined before delivery;

•  the buyer wants the joint included in the supplier’s defined manufacturing scope.

In both cases, verify the actual scope. “Open” does not automatically include site joining, and “endless” does not automatically include installation, measurement or a universal joint-performance guarantee.

RFQ checklist

Send the following information before asking a supplier to confirm the supply form:

Belt identification

•  belt type and full marking;

•  width, construction and strength designation;

•  top and bottom cover thickness and cover grade;

•  edge type and special profiles, sidewalls or cleats;

•  current datasheet, order record or clear product photographs where available.

Dimension and conveyor information

•  required supply form: open, endless or under review;

•  measurement method and approved length or circumference basis;

•  take-up type, reference position and available travel;

•  conveyor drawing, route sketch and pulley arrangement;

•  requested splice or installation allowance stated separately.

Site and handling information

•  access route and limiting clearances;

•  maximum roll diameter, gross weight and packed dimensions;

•  lifting capacity, roll stand and pull-in arrangement;

•  removable and non-removable conveyor components;

•  shutdown window and working-space limits.

Responsibility and documents

•  selected or proposed joining method;

•  party responsible for method approval and installation;

•  materials, tools, press, labor and supervision included or excluded;

•  inspection and acceptance responsibility;

•  required packing marks, manufacturing documents and order-specific records.

Common ordering mistakes

Ordering from centre distance alone. It does not define the complete belt path or approved manufacturing length.

Treating endless as splice-free. A closed loop may contain a factory joint; ask how it is made and documented for the quoted belt.

Leaving the installer out of the RFQ. The installer may need a specific allowance, end preparation, splice material or packing orientation.

Comparing quotations with different scopes. One quotation may cover only the belt while another includes materials, joining or supervision.

Ignoring the handling route. A technically correct belt can still create a project delay if the roll or loop cannot reach the installation point.

Assuming an old belt length is production-ready. Confirm the current conveyor arrangement and take-up reference before release.

What GRAND RUBBER can review before quotation

GRAND RUBBER can review the requested belt construction, open or endless supply form, stated length basis, packing constraints and order-document requirements using the project information provided by the buyer. This review helps expose missing assumptions before quotation and production.

Final belt construction, joint arrangement, dimensions, tolerances, packing plan and any installation-related service remain subject to order-specific technical and commercial confirmation. Site measurement, joining, supervision and installation are not included unless they are expressly stated in the quotation or contract.

FAQ

Is an endless conveyor belt always better than an open belt?

No. Endless supply reduces site joining work only when the closed loop can be measured, transported and installed as planned. Open supply may be more practical where the belt must be pulled through the conveyor and a controlled site-joint procedure is available.

Does an endless belt have no splice?

Not necessarily. “Endless” describes the closed-loop supply form. The loop may contain a factory-made joint, depending on the product construction and manufacturing method. Confirm the joint arrangement for the quoted belt.

Can an endless belt be ordered from conveyor centre distance?

No. Centre distance does not include the complete path around the pulleys or define the take-up reference. Use an approved circumference or length basis.

What must be added when ordering an open belt?

State the manufacturing length, installer-approved splice allowance, number of pieces, end preparation, roll plan, joining method, responsible installer and inspection scope.

Who is responsible for conveyor belt installation and splicing?

Only the quotation or contract can answer this. Do not assume belt supply includes site measurement, joining materials, labor, supervision, lifting, inspection or restart approval.

What should a buyer send to GRAND RUBBER for review?

Send the full belt specification, required supply form, approved length basis, conveyor layout, take-up information, access route, handling limits, joining responsibility and required documents to info@grandrubbers.com.