Check for proper installation of vents and drains.
Hydrostatic vents and drains.
1 for line size 16 and larger.
Normally size of test vents and drains shall be.
Verify chloride content of test water when testing stainless steels.
Purpose of hydro high point vents is to expel air during hydro test.
Pnf0309 v d 09 hydrostatic test vents and drains welded piping nps 2 and up with weldolet and flanges.
On the other hand there are hydro vents and drains which function is to provide proper hydro testing and pipe draining.
After hydro test is done pipe is drained thru low points drains by gravity.
An in line sewer video camera is used in the process to assist with the placement of test balls throughout the system and to map out the layout of the sanitary sewer system.
Hydro testing required that all air must be expelled and pipe must be completely and absolutely fill with water.
Pnf0308 v d 08 hydrostatic test vents and drains welded piping nps 3 4 1 1 2 with weld neck flanges.
Vents and drains shall be closed with a blind flange or a threaded cap plug as provided in the relevant piping class.
Ensure that equipment such as compressors which must not be included in the field tests have been properly blocked off with the casing drain open.
Check open and closed position of all valves.
For line size up to 14.
Inflatable test balls are inserted into the system through existing cleanouts roof vents and exposed toilet drains to perform a hydrostatic test on an isolated portion of the sewer system.