Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Hydronic System Cleaning and Flushing
…37 unchanged lines
## The work of this standard ends at acceptance of passivation and delivery of the signed cleaning, flushing, and passivation report; the ongoing chemical treatment program described in [[sync/hvac-water-treatment]] takes over from that point. {note}
−## This standard owns the construction-phase execution sequence the piping contractor works to. The pre-operational cleaning rationale and the long-term chemistry are owned by [[sync/hvac-water-treatment]]; the two are complementary and shall be read together. {note}
+## This standard owns the construction-phase execution sequence the piping contractor works to. The pre-operational cleaning rationale and the long-term chemistry are owned by [[sync/hvac-water-treatment]]; the two are complementary and shall be read together.
## The Contractor shall not begin cleaning operations until the hydronic piping has passed and the Engineer of Record has witnessed the hydrostatic pressure test required by [[sync/hydronic-piping]] and ASME B31.9.
…119 unchanged lines
## Responsibility Assignment {note}
−### Ambiguity over who performs the cleaning - the piping contractor, an Owner-furnished water treatment provider, or a specialty cleaning subcontractor - creates responsibility gaps and schedule conflicts with TAB and commissioning. The responsible party shall be named before the work begins. {note}
+### Ambiguity over who performs the cleaning - the piping contractor, an Owner-furnished water treatment provider, or a specialty cleaning subcontractor - creates responsibility gaps and schedule conflicts with TAB and commissioning. The responsible party shall be named before the work begins.
### The Contract Documents shall name a single party responsible for cleaning, flushing, and passivation, with the witnessing party identified separately.
…50 unchanged lines
## System Type {note}
−### The cleaning chemistry, flush velocity target, and passivation temperature all depend on the system type and dominant metallurgy, which shall be identified before selecting the method. {note}
+### The cleaning chemistry, flush velocity target, and passivation temperature all depend on the system type and dominant metallurgy, which shall be identified before selecting the method.
```datasheet
…163 unchanged lines
### Trisodium phosphate is restricted for sanitary discharge in some jurisdictions; where TSP is used, the discharge plan shall confirm acceptance before the clean begins. {note}
+### The TSP concentration by weight shall be specified, and its use shall be confirmed against the jurisdiction's sanitary discharge restrictions before the clean begins.
+
```datasheet
label: TSP concentration (by weight)
…6 unchanged lines
```
+### The TSP circulation duration shall be specified, coordinated with the discharge plan confirming acceptance of the chemistry before the clean begins.
+
```datasheet
label: TSP circulation duration
…349 unchanged lines
### On glycol loops the sequencing is explicit: clean and flush with water only, accept the flush, drain 100 percent of the flush water, then charge inhibited glycol at design concentration. Charging glycol into a dirty system embeds construction debris in the glycol where it cannot be flushed out without a full dump and re-clean, and cleaning with glycol in the system wastes expensive fluid and can degrade its inhibitor package. {note}
−### Automotive antifreeze shall not be used; its inhibitor package is not optimized for long-term hydronic service and its dyes and bittering agents interfere with field chemistry tests. {note}
+### Automotive antifreeze shall not be used; its inhibitor package is not optimized for long-term hydronic service and its dyes and bittering agents interfere with field chemistry tests.
### Glycol systems shall be cleaned and flushed with water only; glycol shall not be present during cleaning.
…28 unchanged lines
## System Reinstatement {note}
−### After flushing and passivation, the temporary bypasses come out and the protected equipment is returned to service; any temporary strainers must be removed or cleaned so they do not become a permanent restriction. {note}
+### After flushing and passivation, the temporary bypasses come out and the protected equipment is returned to service; any temporary strainers must be removed or cleaned so they do not become a permanent restriction.
### All spool-piece jumpers and temporary flush connections shall be removed and the permanent piping, coils, exchangers, and valves reinstated.
…50 unchanged lines
default: 1
```