How to Specify Branch Diameter and Connection Details for UHMWPE Tees

To specify a UHMWPE tee, state the main-run outside diameter, branch outside diameter, wall thickness or SDR for each outlet, branch angle, connection type, and the design conditions. Do not rely on a description such as “equal tee” or “reducer tee” alone: those terms may not communicate the dimensions and end details needed for manufacture and installation. I recommend submitting a dimensioned drawing or a complete schedule that identifies every connection. The final dimensions and joining method should be confirmed against the pipe system, operating conditions, and the fitting supplier’s manufacturing capabilities.

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Key Takeaways

• Specify both the main-run and branch dimensions, using the same diameter basis as the pipe drawings—typically outside diameter for plastic pipe systems.
• Include wall thickness or SDR, branch angle, end preparation, joining method, and required tolerances.
• Identify pressure, temperature, conveyed medium, and installation constraints so the fitting can be reviewed for the actual service.
• Treat any example dimensions as a starting point for communication, not as a design recommendation.

Start with the Tee Layout and Diameter Basis

Define the main run and branch separately

A tee has a main run and a branch outlet. An equal tee has the same specified diameter at all three ends, while a reducing tee has a smaller branch or another reduced connection. In a purchase specification, identify the main-run diameter and branch diameter explicitly rather than expecting the supplier to infer which outlet is reduced. If the branch has a different size at each end or includes a reducer, show that geometry on the drawing.

For a clear example, a drawing might call for a 200 mm main run with a 110 mm branch at 90 degrees. These figures illustrate how to communicate the relationship between outlets; they are not a universal size combination or a recommendation for a particular flow rate. Confirm whether the stated dimensions are nominal sizes or actual outside diameters, and use one convention consistently across the pipe, fittings, and project documents.

Specify the branch angle and orientation

State the branch angle relative to the main-run centerline, such as 90 degrees, and indicate the required orientation when the fitting is not symmetrical. For an angled or custom tee, provide a drawing with the angle, center-to-end dimensions, and any required rotation or clocking reference. This information helps avoid a fitting that has the correct outlet diameters but cannot align with the installed pipework.

Connection Details to Include

Wall thickness, SDR, and pressure conditions

List the wall thickness or SDR for the main run and branch, as applicable to the pipe system. Do not assume both outlets have identical wall dimensions simply because they share a material description. The fitting must be reviewed alongside the connected pipe, and the applicable pressure rating should be confirmed for the complete system rather than inferred from diameter alone.

Include the design pressure and operating temperature in the inquiry, along with any relevant surge, vacuum, or external-load conditions. For instance, an operating temperature of 20°C may be included as a project design input, but it does not establish a fitting’s pressure rating by itself. Ask the manufacturer to confirm suitability for the stated service and identify any limits or additional design information required.

Choose and describe the connection end

State how each end will connect to the pipeline. Depending on the system and the fitting design, this may involve a fusion-compatible end, a flange connection, or another specified interface. For a flanged outlet, provide the flange standard or drawing, pressure class where applicable, facing, bolt-hole details, and gasket requirements. For a fusion connection, confirm material compatibility, end dimensions, and the joining procedure with the supplier before ordering.

UHMWPE product terminology and manufacturing routes can differ between suppliers. Therefore, do not assume that a fitting can be joined using a procedure intended for another polyethylene grade or fitting construction. Identify the pipe and fitting material designation used in the project documents, and request written confirmation of the recommended joining method and required equipment or preparation.

Step-by-Step Specification Process

1. Record the connected pipe sizes.

   List the main-run diameter and branch diameter, and state whether each is nominal or outside diameter. Match the project’s established size convention.

2. Define the fitting geometry.

   Specify equal or reducing configuration, branch angle, center-to-end dimensions if critical, and branch orientation. Attach a marked drawing for nonstandard geometry.

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3. Identify pipe-wall requirements.

   Provide SDR or wall thickness for each connected pipe section, plus the applicable material designation. Ask the supplier to review compatibility between the tee and the pipe.

4. Describe every end connection.

   Label the joining method and end details for the run and branch separately. Include flange information or fusion requirements where relevant.

5. Provide service and installation conditions.

   State design pressure, temperature range, conveyed medium, and any known abrasive, chemical, support, or space constraints. Note project-specific inspection or documentation requirements.

6. Request a drawing review before release.

   Ask the supplier to return a dimensional drawing or confirm the proposed configuration before production. Resolve deviations and approvals in writing.

Common Specification Mistakes

Giving only a nominal branch size

A size without a diameter basis can be interpreted differently across drawings, purchasing systems, and supplier catalogs. State the basis and confirm the actual end dimensions required for connection. If an existing line is involved, provide its pipe identification or measured details rather than relying only on a field shorthand.

Omitting wall and connection information

A tee with the right outlet diameters may still be unsuitable if its wall dimensions or end preparation do not match the pipeline. Specify these details for each outlet, especially when the branch and main run differ. Where information is not yet available, mark it as pending confirmation instead of allowing an unstated assumption into the order.

Ignoring installation access and loads

Branch location, nearby supports, valve weight, and available joining clearance can affect whether a tee is practical to install. Include a layout sketch when space is restricted or the branch must face a particular direction. The fitting supplier can review the geometry, but project engineers should confirm system loads and support design.

Information to Send with an RFQ

How We Support Tee Specification

At Shandong Haohua Pipe Industry Co., Ltd., we work with B2B buyers and project teams to clarify fitting dimensions and connection requirements for pipe supply inquiries. When you provide the pipe sizes, material information, operating conditions, and a drawing, our team can review the requested configuration and identify details that need confirmation before quotation or production. Availability of a particular size, geometry, or connection depends on the project requirements and manufacturing review, so we do not recommend assuming a configuration is standard without confirmation.

Conclusion: Specify the Branch as a Complete Connection

To specify a UHMWPE tee accurately, define the main-run diameter and branch diameter on the same measurement basis, then add wall thickness or SDR, branch angle, end connections, and service conditions. A sample notation such as “200 mm main run × 110 mm branch, 90-degree outlet” communicates basic geometry, but it is not complete until the diameter basis, wall requirements, joining details, and design conditions are confirmed. Before placing an order, send a drawing and request supplier review of the proposed dimensions and connection method. For a project quotation or technical review, share your pipe schedule and application details with Shandong Haohua Pipe Industry Co., Ltd.