1, prepare before construction, and check that the nozzle should be flush and burr-free, so as to facilitate direct connection after groove pressing and promote the construction progress; The inner weld can't protrude, so as to prevent the vibration of the groove pressing machine from causing the groove to be wavy and increase the risk of water leakage in the later period;
2. The maximum eversion value of the pipe rolling groove refers to the outer diameter of the nozzle after the groove pressing is completed;
3. Measure the depth of pressing groove with n feet;
4. When the pipeline is tapped, confirm the required aperture size of the hole opener;
5, fixing the tapping machine on the pipe to be tapped, aiming at the position to be tapped, and tapping;
6. Remove the tapping machine after opening, and use a grinder to clean the burr of the opening nozzle to avoid damaging the gasket and reduce the risk of water leakage;
7, tube wire, in order to facilitate on-site management, set the wire number range to 8- 10 wire;
8. Lock the fixture on the processed pipe;
9. Lock the elliptical neck rod in place;
10, complete the installation.
Precautions:
1. When the site needs multiple processing due to the construction progress, the quality inspector shall measure the samples at each position, and then locate the groove depth of the groove press for batch processing. Subsequent quality inspectors should measure one by one, and the inside of the pipeline should be signed and numbered and recorded in the table;
2. Supervise and spot check the piping pressure groove, and strengthen the management of the pressure groove quality;
3. Check the number of silk sets and whether there is burr on the silk mouth. Burrs should be handled in time to prevent debris from blocking the nozzle;
4. When the fire pipeline needs to be painted, it can be grooved first, then painted with primer, and then painted with topcoat after drying; In case of haste, you can brush the primer first, dry it before pressing the groove, and finally brush the topcoat. Try not to press the groove after painting the top coat, which will be time-consuming and laborious in the later period and affect the acceptance progress.
Extended materials:
How to calculate the fixture?
1, the clamp must be calculated according to the actual situation:1must be calculated for straight pipes with grooves and straight pipes connected with the clamp fittings; The position of branch tee of pipeline is calculated by 1 groove tee and 3 groove clamps; ?
2. Calculate the four-way position of pipeline branch, 1 groove four-way, 4-groove clamp; ? 3. When the pipeline turns, calculate 1 groove elbow and 2 groove clamps; ?
4. Calculate the 1 reducer head and 1 groove clamp with different diameters when the pipeline is changed in diameter; ? 5. When installing the valve, calculate 2 grooved flanges and 2 grooved clamps.
References:
Baidu encyclopedia-clamp connection