Trace each chilled, chilled-hot, and condenser water run from the piping plans and schematic to a pipe material, joint type, and valve the issued Section 23 64 26 allows for that service and location. Then check that the balancing method, expansion tank and air separator, pipe anchors and guides, drains and vents, fire-rated penetrations, heat trace, and pressure testing the section relies on are shown or scheduled.
Assemble the review package
Gather the chilled and condenser water flow diagram, the piping plans and sections, the chiller, cooling tower, pump, and coil schedules, the expansion tank and air separator details, the pipe anchor and guide details, the plumbing drawings for makeup water and drains, the architectural rated wall and floor plans, the electrical drawings for heat trace and pumps, and the issued Section 23 64 26 with Sections 23 07 00, 23 05 93, 23 25 00, and 07 84 00. Review one loop from the plant to its farthest coil before assuming the others match.
WBDG publishes UFGS 23 64 26: Chilled, Chilled-Hot, and Condenser Water Piping Systems as a public guide-specification reference (accessed October 21, 2026). Use your project’s issued specification and amendments for the actual comparison; the guide specification does not automatically govern your project. The checklist below is an original suggested review workflow, not a reproduction of the UFGS requirements.
Eight checks to run against the issued set
Use one record per location or system. The CSV contains the same eight prompts plus fields for source revisions, observed evidence, the review owner, the decision, and closure references.
| Check | Sources to compare | Question to resolve |
|---|---|---|
| Service and rating | System Description article + flow diagram + equipment schedules | Is the service temperature-pressure rating the section says is indicated actually shown on the drawings for each system? |
| Pipe material by service and location | Steel Piping, Stainless Steel Piping, Polypropylene Piping, and Copper Tubing articles + piping plans | Does each run use a material the edited section keeps for that service, with polypropylene limited to chilled water and kept out of the locations the polypropylene installation article excludes? |
| Joints and dielectric connections | Fittings and End Connections and Dielectric Waterways and Flanges articles + details | Are grooved, welded, or threaded joints drawn where the section permits them, and are dielectric fittings shown where steel meets copper? |
| Valves and balancing method | Valves, Calibrated Balancing Valves, and Automatic Flow Control Valves articles + coil connection details | Does each coil and branch show the balancing method the section selects, and does it match what the TAB section expects to measure? |
| Expansion tank and air separation | Expansion Tanks and Air Separator Tanks articles + plant plan | Are the expansion tank and air separator shown with the operating pressure the section’s notes ask designers to indicate, and are their vent and blowdown piping routed? |
| Anchors, guides, and expansion | Pipe Alignment Guides, Pipe Anchors, and Expansion Joints articles + piping plans and details | Are pipe anchor locations and details drawn, as the section’s note requires, with guides at each expansion loop or joint? |
| Drains, vents, makeup, and heat trace | Air Vents, Drains, Drain and Make-Up Water Piping, and Heat Trace articles + plumbing and electrical drawings | Are drain and makeup water piping shown, high-point vents and low-point drains provided, and heat trace drawn and powered where the section says to show it? |
| Penetrations and testing | Building Surface Penetrations, Fire-Rated Penetrations, and Pressure Tests articles + rated plans + test plan | Do rated wall and floor crossings point to Section 07 84 00 systems, and does the test plan cover hydrostatic testing before concealment and the separate flushing for polypropylene? |
Worked example: polypropylene chilled water in a ceiling plenum
Illustrative example: the issued Section 23 64 26 keeps the polypropylene piping articles, and the piping plans label the chilled water branch mains as polypropylene. The reflected ceiling plans and mechanical notes show the ceiling space above the corridors as a return air plenum, and the polypropylene installation article excludes plastic pipe from air plenums.
Ask the mechanical engineer to change the material for the runs in the plenum, or to reroute them outside it, and to label the transition points on the plans. Recheck the rated corridor wall crossings and the insulation callouts for the changed runs, since both depend on the pipe material.
Avoid a false conflict
Section 23 64 26 also contains water treatment paragraphs that can overlap Section 23 25 00. Confirm which section the project uses for chilled and condenser water treatment before raising a missing item.
When requirements disagree, follow the project’s document-control and clarification process. Do not assume that drawings always override specifications, or the reverse. Identify the exact sources and request an authorized decision.
Close the issue across the affected documents
Record the location or tag, drawing and specification references, issue dates, observed difference, and the decision needed. Assign an owner and keep the item open until the response identifies the governing requirement. Check the revised drawings and specification references together; a response email alone may leave the issued package inconsistent.
For the overall process, use the guide to drawing and specification conflicts. Mark an inapplicable checklist row with a reason, and distinguish a verified correction from a question that still needs design information.
Where Groundbook fits
Groundbook’s drawing and specification review helps investigate potential disagreements in the documents you supply. Include the relevant specification sections and drawing references, then verify the cited evidence with the responsible reviewers before acting on a finding.