HEATING MAIN MONTAGE INSTRUCTIONS CV4.04
6. HYDRAULIC TESTING
After the non-destructive testing of the welding; pipeline undergoes the hydraulic control,
recommended in several steps, with pressure that exceeds maximum service pressure 1.3
times but not less than 16 bar.
Testing should be made with costumer presence and supervision. About testing results
should be composed record (protocol).
Cold water should be used for hydraulic testing. The control pressure duration should take
at least 15 minutes.
Testing pressure can not be decreased for more than 5% from initial testing pressure.
During testing, montage stitch cannot show any moisture.
If the leak is found, then appropriate welding place should be cut out and repeatedly
welded. Hydraulic testing should be repeated.
Testing section should be disconnected from already working pipeline using seals.
The hydraulic testing should be carried out after welding of all connecting units, but before
montage of the sleeves.
6.1.
