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I was reading an installation manual for a tank-type water heater and in had a warning of accumulation of hydrogen gas in water heaters where hot water is not used for weeks. I did some searches online and it it seems to be linked with reaction between the sacrificial anode in the water...

Does the International Plumbing Code allow allow for 90 degree horizontal turns in fixture trap arms without the need for a cleanout (also called dirty arm) similar to the Uniform Plumbing Code? I couldn't find it in the IPC, but maybe it is defined differently. Example: a horizontal trap arm...

Would you still size the water heater for the 300 gallons, or just for the fraction of hot water that goes to the mixing valve? Example: if cold water at 40 f, hot water at 140 F, and mixed water temp leaving the mixing valve is at 70 F, the ratio of hot water to cold to the valve is approx...

I am sizing a gas fired tank-type water Hester for an a combo emergency shower eyewash. Looking to size water heater to deliver 140 F and then use mixing valve to temper water to 80 F to fixture. My question: do I size the water heater for the full 23 GPM required at the combo fixture for the...

I've read that the residual pressure in water mains needs to stay above 20 psi in order to prevent pipe collapse. Why would pipe collapse at 20 psi residual?

Thanks for your help.

So if I have results of a hydrant flow test which list static and residual pressure at a specific GPM (usually at a much higher flow rate than my design GPM), I can graph these points, dramas a line through them, and find the residual pressure available at the design GPM?

When designing domestic water pipe systems, plumbing code indicates to use available static pressure as starting pressure in calculations. I have read elsewhere to start off with residual pressure (which is lower than static) as starting pressure. Which is correct?