Introduction: Replacing a single TBM tunnel gasket is more straightforward when the old part, equipment position, dimensions, hole layout, quantity, and shipping requirements are documented together.
A maintenance replacement may begin with a removed rubber seal on the workshop floor, an equipment number in the service record, and a few photographs from the tunnel site. The original drawing may be incomplete, and the project may require only one replacement piece. The key decision is whether the available information is sufficient to identify the old seal and prepare a practical order. Start with the seal’s installation position, the TBM or tunneling-machine record, and new measurements. Terms such as entrance rubber seal, exit rubber seal, rubber flange, black eye seal, launch seal, and launching seal can help describe the part, but the replacement order depends on confirmed geometry, hole orientation, material requirements, and commercial terms.
Start Replacement Identification With the Old Seal and Equipment Position
Consider a field team removing a damaged circular gasket from a TBM starting or receiving area. The maintenance file identifies the machine, but the old seal has no visible part number. A technician has one full-face photograph, one close-up of the edge, and a rough measurement taken before disposal. The purchasing team needs one tunnel rubber seal rather than a complete project package. This situation can create confusion because “entrance” and “exit” refer to installation positions. The correct term must be matched with the actual equipment arrangement. Connect the old seal to the machine record by recording the TBM or tunneling-machine brand and model, project section, shaft or wall location, removal date, and any drawing number associated with the original installation. If the seal was installed at a starting wall, identify that location clearly. If the maintenance team calls it a tunnel receiving seal or exit rubber seal, keep that description with the physical location until the supplier reviews the information. This approach prevents a familiar product name from being treated as a standard replacement configuration. Photographs provide useful initial references. Take images of the complete ring, central opening, edge shape, bolt-hole pattern, visible reinforcement, and any markings on the rubber. A photograph of the seal beside a tape measure can also establish scale. Photos are most useful when combined with equipment records and measured dimensions. The AngXin rubber seal is described for tunneling-machine and TBM projects and for a starting-wall position intended to block mud and water from flowing back toward the starting shaft. Its listed names include rubber seal, rubber flange, black eye seal, launch seal, and launching seal. These terms can help describe the old part in an inquiry, while the installation position and machine information support the specification review. The condition of the removed seal should also be recorded. Note torn areas, elongated holes, missing sections, compressed edges, previous repairs, and deformation caused during removal. These observations help distinguish reliable original features from wear-related changes. If the maintenance record contains an old purchase order, packing list, drawing revision, or part number, include it with the photographs rather than relying on the name alone.
Dimensions and Hole Layout Determine Replacement Suitability
A replacement tunnel segment gasket must correspond to the existing opening and fastening arrangement. A similar-looking ring may still be unsuitable if its opening is too small, its outside edge reaches a different area, or its holes do not align with the machine flange. Remeasure the part even when an old drawing is available because drawings and installed components may represent different revisions. Measure the inside diameter and outside diameter at more than one point where possible. If the readings differ, record the range and note whether the old gasket was stretched, compressed, cut, or damaged. Measure thickness away from torn edges. Also record whether the gasket has a uniform thickness or a shaped profile. Available thickness options include 10 mm, 20 mm, and 30 mm. The applicable thickness should follow the equipment drawing, existing part, or project requirement. Replacement quantity is unrelated to thickness selection: a one-piece order still requires the same dimensional review as a larger order. PCD and hole orientation require the same care as the ring diameters. PCD identifies the circle on which the hole centers are arranged. For a maintenance order, the PCD and individual hole positions must align with the existing mounting arrangement. Record the number of holes, hole diameter, first-hole reference, direction of rotation, and any unusual gap or indexing point. The replacement layout should follow the equipment drawing or verified measurements from the old part. A 5-degree description should therefore be included as a proposed configuration for review rather than substituted for actual field dimensions. When the old gasket is available, place it flat without forcing it into shape. Mark a reference point at the top or at a known bolt position, then measure around the circumference from that reference. Photograph the reference mark and indicate the viewing direction. This gives the supplier a consistent basis for interpreting clockwise and counterclockwise hole orientation. If only a fragment remains, record its profile, thickness, reinforcement, edge condition, and relationship to the nearest bolt holes. Combine these observations with the machine drawing and installation photographs. This information allows a supplier to compare the old-part data with a proposed specification instead of reviewing only a generic “TBM gasket” description. The product uses natural rubber with internal nylon wire and horizontal cotton wire support. Original equipment requirements for rubber grade, hardness, temperature range, fluid conditions, and other material details should accompany the measurements. Before approval, compare the measured values, drawing values, and proposed replacement values in the same units. Differences should be resolved by reference to the installed equipment arrangement and the responsible technical personnel. This comparison is especially important when the old gasket has been distorted in service or the maintenance team is working from an incomplete drawing revision.
Single-Piece Quantity and Shipping Preparation Shape the Order
Maintenance purchasing differs from new-project purchasing. A project may require a complete set, while a field team may need one replacement tunnel gasket for a specific repair or a planned spare-parts order. The listed MOQ is 1 piece, allowing an inquiry to cover a single gasket or a small quantity. Current availability and delivery timing depend on the approved specification and order conditions. Transport planning also matters for a small order. The gasket may be rolled, wrapped in plastic film, and placed in a wooden or plywood case prepared for sea shipment. The packing method affects the shipment’s external dimensions, handling requirements, freight calculation, and documents. The permitted rolling arrangement should account for the gasket’s final geometry and the approved packing method. For an overseas maintenance order, state the destination country and final delivery location separately. A port address and a jobsite address may require different transport arrangements. International trade in wood packaging can also involve phytosanitary requirements, making the destination and shipping route relevant to the packaging discussion. Bring the technical and delivery details together:
- Quantity and replacement reason: State whether the requirement is one piece or a small quantity, and explain whether it supports an emergency repair, scheduled maintenance, or a spare-parts order.
- Packing and destination: Provide the destination country, port or inland location, and any project packing instructions. Plastic film with a wood or plywood case can support transport preparation, with final packing details established for the shipment.
- Documents: Ask which shipping, packing, and commercial documents can be prepared. Include any wood-packaging documentation required by the destination, carrier, or project.
- Requested timing: Give the date when the gasket is needed at the site, not only the date when the purchase order may be issued. Availability, production timing, document preparation, packing, and transport should be scheduled as separate stages.
A wooden or plywood case identifies a packing approach rather than an arrival date. Delivery planning begins after the replacement specification, quantity, destination, transport method, and documentation requirements are established. A site-required date should therefore be translated into an order schedule that accounts for technical approval, preparation, packing, dispatch, and transit. AngXin publishes support for specification review, technical communication, shipping documents, packaging, and delivery coordination. Before placing an order, obtain written confirmation of the final dimensions, material requirements, quantity, packing method, destination terms, current availability, delivery timing, warranty position, and installation responsibility. Equipment compatibility and the relevant entrance or exit position should also be recorded for the specific replacement.
Conclusion
Treat a single replacement TBM gasket as a maintenance part linked to a specific machine and installation location. Begin with the removed seal and equipment record, then remeasure the inside diameter, outside diameter, thickness, PCD, and hole orientation. Add the quantity, destination, packaging, documents, and required arrival date so the supplier can address both the technical and shipping requirements. Send the available drawings, photographs, measurements, material information, equipment details, and delivery requirements to AngXin Solid Control for specification review and quotation.
FAQ
Q：Can a TBM tunnel gasket be ordered as a single replacement piece?
A：Yes. The listed MOQ is 1 piece, so a single replacement or small-quantity maintenance order can be discussed. Provide the old-part information, TBM or tunneling-machine details, dimensions, hole layout, material requirements, destination, and requested timing.
Q：What old-part information helps identify an entrance or exit rubber seal?
A：Useful information includes the machine brand and model, starting or receiving-area location, inside diameter, outside diameter, thickness, PCD, hole diameter, hole count, hole orientation, profile, material details, and any drawing or part number.
Q：Does wooden-case packaging confirm the delivery time for a replacement tunnel gasket?
A：Wooden or plywood case packaging describes a transport-preparation method rather than a delivery schedule. The delivery date depends on specification approval, availability, production or procurement timing, packing, document preparation, destination, and transport method, all of which should be established for the individual order.
Sources / References
Road Tunnels Manual - PIARC (World Road Association)
Tunnels - Structures - Bridges & Structures - Federal Highway Administration
Related Examples
Entrance / Exit Rubber Seal Tunnel Segment Gaskets for Tunnel - AX Solid Control Equipment
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