GRE Pipe Lamination Butt-Joint Tutorial

This quick guide demonstrates how to perform butt joints using OTA Fiberglass Pipe Tools. the whole butt and wrap joint fiberglass process including the Lamination for rtr/grp/gre/grup and other frp pipes on Site. no matter the type of pipe/its origin, this easy-to-follow tutorial as well as the video below will help explain all about lamination butt joints.

Butt and Wrap Lamination Joint

The butt-and-wrap joint typically consists of two plain pipe ends which have been prepared for joining by sanding, Preparing and laminating the outside surface in the joint area.

Butt and Wrap Joint Assembly instructions

The butt and wrap jointing method is most commonly applicable to pipes from 1” (25mm.) to 40″(1000mm.). However, larger pipe diameters from a few pipe manufacturers also utilize the butt and wrap joint system.

First, the spigots are connected end to end and aligned on the same centerline. The joint is made by adding layers

of The resin Mixture-impregnated fiberglass Fabrics (Chopped Strand Mat, boat tape Or woven roving). Each layer becomes increasingly thicker to accommodate the increasing internal pressure from the layers (and Pipe) under it.

What is The Laminate Made of?

The butt and wrap laminate consists of fiberglass reinforcement materials (Again fiberglass cSM, Boat Tape And woving roving) and a resin system to bind them together. For estimated material by joint requirements please refer to the pipe manufacturer’s Catalog Or Contact us through Chat – Online Now

Resin Mixture/System

Usually, the resin system consists of 100 parts of the same resin as the matrix resin used in making the pipe itself with 20-30 parts of hardener/curing agent and 10-15 parts of catalyst. These rations depend on pipe compositions so they vary with different pipe specifications and manufacturers. please refer to the pipe manufacturer’s Catalog for mixture rations Or Contact us through Chat – Online Now

Fiberglass Reinforcement Materials

This depends on the pipe manufacturer. Chopped Strand Mat and Woving Roving anywhere from 270gm/m²to 700gm/m²

Other materials like boat tape, surface veil, etc may be added as per Pipe manufacturer’s recommendation. please refer to the pipe manufacturer’s catalog Or Contact us through Chat – Online Now

Steps

Equipment Check

Hacksaw
Abrasive Cutting Disc
Pipe
Supports
WhiteMarker
Wrap-Around
Flapper-Wheel
Drilling Machine
Balance(WeighingScale)
Aluminum Rollers
Heating Blankets
Resin Mixer
Paint Brush
Rubber Scraper Plate

Pipe Cutting

Factory-ready pipes are usually cut to length and ready as spigots. However, in case a pipe length needs adjustment, use the following instructions to cut and prepare the pipe. Once the pipe is cut, sanding and pipe end preparation are required to get the new pipe ends ready for the next step.

Mark the pipe section to be cut using a wrap-around and a white marker. Cut the pipe using A metal-cutting saw – like A hacksaw or A cutting Disc/an abrasive wheel. make sure that a proper square cut has been made

I. Preparation of Lamination Area.

Mark the required lamination lengths (we labeled it B/2) – in the picture above. follow the pipe manufacturer recommended lengths. please refer to the pipe manufacturer’s catalog Or Contact us through Chat – Online Now In the above example, we set the size of the pipe to be sanded to 25mm from the length of the lamination Mark (B/2).

II. Sand the pipe

Sand or grind the crosssection of the pipes (the cut ends) as well.

Apply Adhesive Layer

III. Connect The Pipe Ends With Adhesive

Position the pipe sections for joining. Prepare the adhesive mixture according to the given instructions. Coat the cut ends with adhesive to protect them against penetration. Coat the external surfaces of the pipe ends approximately 100 mm in width, and join them together.

Cure The Adhesive

IV. Apply A Heating Blanket

Use a heating blanket to cure the Adhesive for one hour or until the adhesive is dry. Sand the surface after curing before proceeding to the following step. Use the recommended standard temperature of 115°C on OTA Fiberglass Heating Blanket or the temperature recommended per pipe manufacturer.

Lamination

V. Apply laminate Layers to the joint

After Sanding the surface in previous step, The pipe Ends should be clean and dry. If not, then dry Again with a heating blanket for at least 15 minutes. Make sure each applied laminate layer of Chopped strand mat and woven roving is thoroughly impregnated with the resin mixture. See video below details on how we mix laminate layers with resin – how to structure, sequence and overlap laminates, quantities of fiberglass reinforcement materials and resin mixture involved in lamination.

During the wrapping process, press The resin out of the layer Using aluminum rollers. This helps prevent uneven surfaces from forming in the lamination layer while also rolling out air bubbles. watch the video below for the full lamination process.

Watch this video on YouTube

Cure The Laminated layers

VI. Apply A Heating Blanket to the laminated layers

to ensure proper curing use the blanket size matching the pipes. Cure the laminate for 3-4 hours until the laminate is cold and solid. Throughout the process, monitor the temperature of the heating blanket every 15-30 minutes. OTA Fiberglass Heating Blankets Come each with an external thermostat unit – OTA Fiberglass split regulator which we designed for uniform heating in variable weather conditions.

After curing, use sandpaper to remove the rough edges of the laminate and to generally smooth out the external surface.

Use the recommended standard temperature of 115°C on OTA Fiberglass Heating Blanket or the temperature recommended per pipe manufacturer.

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