Static pressure — plumbing: code vs good practice

Code: 80 psi max. Good practice: 50–70 psi.

Over 80 psi — plumbing: code vs good practice

Code: pressure reducer. Good practice: meet code.

Code: 3″. Good practice: meet code.

Code: 2″ min. Good practice: meet code.

Code: bond CSST. Good practice: meet code.

Code: no specific requirement. Good practice: easy to reach.

Systems · Chapter 23

Plumbing is two systems that must never mix: clean water under pressure in, and waste by gravity out, with vents letting air in so drains flow.

IRC Chapters 25–33IRC P2903 pressureIRC P3201 trapsIRC G24 fuel gas

23.1

Supply comes in under pressure, splits to fixtures, then leaves by gravity through drains and out the sewer. Vents keep it all moving.

Know where your main shutoff is.

The rest of Plumbing: 4 more spreads, 23 drawings and 18 code citations, plus every other chapter, is part of the full fieldbook.

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