|
Test criteria |
|
Maximum applicable pressure |
The maximum applicable pressure of sprinkler joint must be higher than 14kgf/㎠. No abnormality |
No abnormality |
pressure resistance test |
There must not be any deformation, breakage or leakage when water pressure that is equivalent to 1.5 times the maximum applicable pressure (21kgf/㎠) has been applied for 15 minutes. |
No abnormality |
permanent deformation test |
After having applied water pressure that is equivalent to 1.5 times the maximum applicable pressure (21kgf/㎠) for 1 minute and let the product sit idly for 5 minutes, the length must be less than 8.4mm/m and must not exceed maximum of 31mm. |
No abnormality |
vibration test |
There must not be any loosening or leakage when subjected to vibration with pitch of 5 mm and frequency of 25 times/second for 6 hours while under the water pressure of 1kgf/㎠. |
No abnormality |
bending test |
There must not be any leakage after the product has been subjected to bending test in which the product has been repetitively bent through 90° angle to the left and right 15 times each under water pressure of 0.21kgf/㎠. |
No abnormality |
water hammer test |
There must not be any leakage when water pressure that is equivalent to 1.5 times the maximum applicable pressure (21kgf/㎠) has been applied for 5 minutes after having subjected the product to continuous water hammering 4,000 times at the force of 3.5kgf/㎠~35kgf/㎠ per second. |
No abnormality |
destructive test |
There must not be any destruction when water pressure that is equivalent to 4 times the maximum applicable pressure (56kgf/㎠) has been applied. |
No abnormality |
frictional loss test |
Emission coefficient (K) and equivalent length must be within 5% of the proposed value. |
No abnormality |
