Field Joint of Cement lined Pipe
•
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This document provides instructions for field joining of cement lined pipes for fire water lines. It describes the stages of the process which include mixing the coating material, surface preparation of the steel, applying the material, fitting up the joint, and welding. The coating material used is called SINMAST, which is a two-component epoxy resin. The document provides details on mixing and applying the coating material, preparing the steel surfaces, fitting up the joint, allowing time for the material to harden before welding, and testing the completed joint.
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Field Joint of Cement lined Pipe
- 2. Stages • Mixing of coating material • Surface preparation • Application • Joint fit‐up • Welding • Testing Prepared By V.Johnson Prabu
- 3. Coating Material SINMAST • SINMAST joining compound is used for bonding cement lined piping components. • Sinmast is a 2 component , solvent free product based on Epoxy Resins • Component A – Resin (0.945kg) • Component B – Hardener (Ethylamine , Isopropylideendifenol) (0.055kg ) Prepared By V.Johnson Prabu
- 5. Coating Material Mixing • Both component A & B mixed together • To avoid wastage it can be divided into 10 parts and use it as required. • The pot life of mixed component is 25min @ 20o C approx. ( Working Time ) • The hardening time is 8hrs @ 20o C approx. Prepared By V.Johnson Prabu
- 6. Coating Material Mixing • Component A Total weight = 945 gm 1/10 part = 94.5 gm Prepared By V.Johnson Prabu
- 10. Application • Apply the mixed coating material gentily on the sleeve side at an angle of 45o approx. • Remove the excess material. • The join the mating surface and apply slight pressure. ( usually after joining you can find 3mm difference ) Prepared By V.Johnson Prabu
- 14. Welding • Do not move the joint after fit up. • Support the line adequately to restrict the movement. • After 12 hrs (ie; hardening time of coating material ) the joint is ready for welding. Prepared By V.Johnson Prabu