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Hi LittleInch, I have a distributed impressed current cathodic protection system for underground (ductile iron) fire network for power plant, the terminal points with fire buildings networks haven't insulation kits between the U/G and A/G networks. I asked the cathodic supplier for this concern...

so we can't use a metal gasket to GRP flange or this is not recommended

In my application, I have valves connected to GRP flanges. shall I use a rubber gasket or spiral wound gasket for GRP flanges. Thanks in advance.

what is the minimum allowed distance to assemble 2 elbows 90 degree (bell and spigot), ductile iron, 12", underground, used for fire system, working pressure 10 bar.

for vertical pipes, what is the suggested maximum span for 4" pipe, looking through ASME B31.1, i couldn't find indication for this subject.

For this case, i have a distribution chamber which is continuously filled with water with head 7m to feed a clarifier with head 6m. my concern is the pressure for point A in this drawing . if it will be the difference between the two levels or will be the total head in the distribution...

It is mentioned in our company document to use electric-resistance welded pipe i indoor application for fire fighting, but when i use NFPA 13, i found that it is applicable but with ASTM A135 while my document say that it should be A53. note: the connection i grooved not welded for sizes larger...