testing joints for multi-segment pipe

Liquid Penetrant testing (PT) was used to test various pipe configurations that we used to custom fabricate. Leak through testing was the best method variation;
*penetrant is applied on the interior welds
*dwell time
*see (if you can see) any seepage from the exterior.

No leaks meant the next step was apply concrete or ship the spool or pup piece.

Thanks for the information on LP testing. However, perhaps I could clarify my situation. I am designing for a precast, multi segment, concrete arch basically... sort of a series of adjacent underground keystone bridges. The particular joints I need to test occur in-between the stones of a single arch, so to speak. I'm a little unsure as to how to apply LP testing in this manner, as I need to keep pressure on the gasketed material inside as well as the faces of the concrete segments.

Thank you again for your reply.

Sorry bout that Wave. Got me on that one.

are you testing after construction? If so, why not just fill with water and measure the loss.

If testing prior to installation, you could fit two sections together, bulkhead the ends and fill with water or use low pressure air test.

are you designing for a pressure situation, or just trying to limint infiltration/exfiltration?

You may have to use an injected grout or one that the joint material is impregnated with. then activated by the addition of a catlyst. Talk to afew of the grout manufacturers. Avanti, 3M are acouple. but to test you will have to wait until the 'pipes' are backfilled so you can use a large packer and air pressure. Look in the 'trenchless' industry areas for suppliers and contractors.

I would call the pipe manufacturers in your area and discuss it with them. They are the one's that will have to manufacture the pipe you are designing and would surely have practical insights into the joint designs and how to test them. After all, if you design/specify a pipe that they can't produce you will either get no bids or skyhigh pricing.

Just a thought!