PENYAMBUNGAN PIPA HDPE | BUTT FUSION PROCEDURE
| 05.04 |
PROSEDUR PENYAMBUNGAN PIPA HDPE
BUTT FUSION
Butt Fusion digunakan untuk menyambung 2 pipa pada bagian ujung-ujungnya. Penyambungan dengan Butt Fusion untuk pipa HDPE mengharuskan meleleh (melt) serta diperlukannya tekanan, hal ini harus dipersiapkan sebaik mungkin..Permukaan pipa akan secara simultan meleleh oleh plate heater yang panas. Kemudian plate heater diangkat dan kedua permukaan yang telah meleleh ditekan agar menyatu. Bagian lelehan tersebut akan menyatu dengan proses pendinginan akan dihasilkan sambungan yang homogeny dan memiliki kekuatan bahkan lebih kuat dari pipa itu sendiri, baik dari segi tensile strength maupun aspek tekanan.
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| BUTT FUSION MACHINE |
BUTT FUSION PROCEDURES
Prosedur penyambungan pipa berikut adalah didasarkan aturan dari PPI (Plastic Pipe Institute) TR 33 Generic Butt Fusion Joining Procedures.
SET UP
Heating tool surfaces must be at a specified temperature of a MINIMUM 400 DEGREES F – MAXIMUM 450 DEGREES F. All points on the heating plate must be within the specified temperatures before you begin. Heater plates should be checked periodically with a pyrometer in all points where the heating plate comes in contact with the pipe. Heater plate’s surfaces should be clean and undamaged.
Interface pressure should be set at a MINIMUM 60 PSI – MAXIMUM 90 PSI. Interface pressures are calculated for manual fusion machines equipped with a torque wrench and hydraulic machines pressure gauge settings. The machine manufactures instructions are used to calculate the interfacial pressure. Each pipe size and sdr should be calculated and set before beginning to join that size of polyethylene pipe.
PROCEDURE
SECURE PIPE
Clean the inside and outside of the pipe or fitting with a clean, dry, lint-free, non -synthetic (cotton) cloth or paper towel. Align the pipe or fitting ends in the machine. Adjustable pipe rollers or outriggers are used to level the pipe into the fusion machine clamps without forcing the pipe into alignment against open fusion machine clamps. Pipe and fittings ends should protrude past the line-up clamps so that facing will be complete. Check to see that clamps are properly secured to prevent pipe and fitting slippage.
Clean the inside and outside of the pipe or fitting with a clean, dry, lint-free, non -synthetic (cotton) cloth or paper towel. Align the pipe or fitting ends in the machine. Adjustable pipe rollers or outriggers are used to level the pipe into the fusion machine clamps without forcing the pipe into alignment against open fusion machine clamps. Pipe and fittings ends should protrude past the line-up clamps so that facing will be complete. Check to see that clamps are properly secured to prevent pipe and fitting slippage.
FACE
Insert the facing tool between the pipe ends and trim them until they are complete smooth, clean, parallel butt ends. Face completely until fusion machine stops. Check to insure that there are no nicks or un-faced areas in the pipe ends. Remove all shavings from the pipe ends and inside the pipe after facing. Do not touch the pipe ends with your hands after facing. Clean if necessary with a clean cloth or paper towel and alcohol to remove any oil present from touching the pipe ends.
Insert the facing tool between the pipe ends and trim them until they are complete smooth, clean, parallel butt ends. Face completely until fusion machine stops. Check to insure that there are no nicks or un-faced areas in the pipe ends. Remove all shavings from the pipe ends and inside the pipe after facing. Do not touch the pipe ends with your hands after facing. Clean if necessary with a clean cloth or paper towel and alcohol to remove any oil present from touching the pipe ends.
ALIGN
Bring the pipe ends together after facing. Check for slippage at fusion pressure and high low alignment. If necessary, adjust high side by tightening clamps. Do not loosen low side as slippage could occur during fusion. Do not use fingers to check alignment under hydraulic pressure. Slippage under pressure could result in crushed fingers. Look for complete contact around both ends with no gaps and no misaligned hi - low areas.
Bring the pipe ends together after facing. Check for slippage at fusion pressure and high low alignment. If necessary, adjust high side by tightening clamps. Do not loosen low side as slippage could occur during fusion. Do not use fingers to check alignment under hydraulic pressure. Slippage under pressure could result in crushed fingers. Look for complete contact around both ends with no gaps and no misaligned hi - low areas.
MELT
Check that the heating tool is maintaining the correct temperature. Insert the heating tool between the pipe ends and bring the pipe ends together under pressure to ensure full contact against the heating tool. Hold the pipe/fitting ends against the heating tool without pressure. A “roll back” or bead of melted polyethylene will form on the pipe ends against the heating tool. When the correct rollback bead size is formed, separate the pipe ends and remove the heating tool.
Check that the heating tool is maintaining the correct temperature. Insert the heating tool between the pipe ends and bring the pipe ends together under pressure to ensure full contact against the heating tool. Hold the pipe/fitting ends against the heating tool without pressure. A “roll back” or bead of melted polyethylene will form on the pipe ends against the heating tool. When the correct rollback bead size is formed, separate the pipe ends and remove the heating tool.
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