Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Mechanical Identification
…103 unchanged lines
## Equipment nameplates and warning labels shall meet the durability, contrast, and legibility requirements of ANSI Z535.4.
−## Field-applied installers shall confirm pipe outside diameter including insulation before selecting marker size, because marker selection by nominal pipe size rather than insulated outside diameter is the most frequent submittal rejection. {note}
+## Field-applied installers shall confirm pipe outside diameter including insulation before selecting marker size, because marker selection by nominal pipe size rather than insulated outside diameter is the most frequent submittal rejection.
## The color classification system shall be resolved with the Owner and documented in the project color schedule before any identification device is procured.
…23 unchanged lines
### Pipe markers shall be selected by pipe outside diameter including insulation, not by nominal pipe size.
+```datasheet
+label: Pipe marker type
+type: radio
+options:
+ - Wrap-around self-adhesive vinyl
+ - Snap-on rigid PVC (clip-mount)
+ - Wrap-around rigid PVC (self-coiling)
+ - Heat-resistant polyester
+default: Wrap-around self-adhesive vinyl
+```
+
### Legend letter height shall meet ASME A13.1 Table 4.2-1 for the marked outside diameter as scheduled below.
−### ASME A13.1 sets minimum letter height by outside diameter so legends remain legible at the viewing distance typical for that pipe size; the larger the pipe, the farther away it is normally read. {note}
−
```datasheet
label: Legend letter height (by pipe OD including insulation)
…9 unchanged lines
```
+### ASME A13.1 sets minimum letter height by outside diameter so legends remain legible at the viewing distance typical for that pipe size; the larger the pipe, the farther away it is normally read. {note}
+
### The color band at each end of a marker shall be at least as long as the printed legend field.
### For the 2.5 to 6 in. outside-diameter range typical of most HVAC piping, the default marker is an 8 in. label with a 2 in. color band at each end. {note}
−```datasheet
−label: Pipe marker type
−type: radio
−options:
− - Wrap-around self-adhesive vinyl
− - Snap-on rigid PVC (clip-mount)
− - Wrap-around rigid PVC (self-coiling)
− - Heat-resistant polyester
−default: Wrap-around self-adhesive vinyl
−```
−
### Wrap-around self-adhesive vinyl is the default for interior, conditioned mechanical rooms; snap-on PVC is the default for refrigeration and cold lines where adhesive bonding below 40°F is unreliable. {note}
+### The marker legend text source shall be specified for each application as pre-printed standard legend or custom-printed project-specific legend.
+
```datasheet
label: Marker legend text source
…9 unchanged lines
### Each piping service shall be assigned a band color, legend text, and hazard category in the project color schedule before procurement.
−### ASME A13.1 defines six predefined color combinations for hazard classes plus user-defined combinations for services it does not enumerate; the predefined classes cover flammable, fire-quenching, toxic/corrosive, combustible, and water services, with other services assigned from the user-defined set. {note}
−
```datasheet
label: Color classification system
…25 unchanged lines
```
+### ASME A13.1 defines six predefined color combinations for hazard classes plus user-defined combinations for services it does not enumerate; the predefined classes cover flammable, fire-quenching, toxic/corrosive, combustible, and water services, with other services assigned from the user-defined set. {note}
+
### Where the Owner facility color code conflicts with an ASME A13.1 predefined category, the deviation shall be documented in the project color schedule.
…4 unchanged lines
### Flow-direction arrows shall be provided at every pipe marker location, either integral to the marker or as separate adhesive arrow strips.
−### Reversible and two-pipe changeover systems — including condenser water and changeover hydronic loops — shall be marked with arrows in both directions.
−
−### Without flow arrows on a changeover system, an operator cannot determine flow direction after a seasonal switchover; both-direction marking preserves that information through the changeover. {note}
−
```datasheet
label: Flow arrow provision
…6 unchanged lines
```
+### Reversible and two-pipe changeover systems — including condenser water and changeover hydronic loops — shall be marked with arrows in both directions.
+
+### Without flow arrows on a changeover system, an operator cannot determine flow direction after a seasonal switchover; both-direction marking preserves that information through the changeover. {note}
+
# Valve Tags {toc}
…2 unchanged lines
## Valve tags shall be round, 1-1/2 in. minimum diameter, with stamped sequential numbers and a chain or S-hook attachment.
−## The 80%-case valve tag is a polished brass round tag, 1-1/2 in. diameter, 19-gauge minimum, with a brass ball-chain attachment. {note}
+## The standard valve tag is a polished brass round tag, 1-1/2 in. diameter, 19-gauge minimum, with a brass ball-chain attachment. {note}
+## The valve tag material shall be specified based on the tag's interior or exterior exposure and any chemical exposure at its location.
+
```datasheet
label: Valve tag material
…32 unchanged lines
### The schedule shall be bound in the operation and maintenance manual and a laminated copy shall be posted in the mechanical room.
−### A numbered-only tag carries no meaning without its schedule; binding the schedule in the O&M manual and posting a laminated copy in the mechanical room keeps it available to maintenance staff at the equipment. {note}
−
```datasheet
−label: Valve tag legend format
−type: radio
−options:
− - Number only (correlated to bound schedule)
− - Number plus engraved service name
−default: Number only (correlated to bound schedule)
−```
−
−```datasheet
label: Valve tag schedule location
type: checkbox
…6 unchanged lines
```
−### A sample valve tag schedule format is shown below; the Contractor shall complete one row per tagged valve. {note}
+### A numbered-only tag carries no meaning without its schedule; binding the schedule in the O&M manual and posting a laminated copy in the mechanical room keeps it available to maintenance staff at the equipment. {note}
+### A sample valve tag schedule format is shown below; the Contractor shall complete one row per tagged valve.
+
| Tag No. | Service | Location | Normal Position |
|---------|---------|----------|-----------------|
…2 unchanged lines
| CW-006 | Condenser water isolation | Penthouse, CT-1 | Open |
+```datasheet
+label: Valve tag legend format
+type: radio
+options:
+ - Number only (correlated to bound schedule)
+ - Number plus engraved service name
+default: Number only (correlated to bound schedule)
+```
+
# Equipment Nameplates {toc}
## Field-mounted mechanical equipment — air handling units, pumps, fans, heat exchangers, boilers, chillers, cooling towers, and similar — shall receive an engraved nameplate bearing the equipment designation.
−## Nameplate legend letter height shall be 1/2 in. minimum; 3/4 in. is recommended for mechanical-room equipment read from floor level and 1 in. for large plant equipment such as chillers and cooling towers.
−
−## Letter height drives legibility at the distance equipment is normally identified; a 1/2 in. legend is adequate at close range but plant-scale equipment is read across the room, so larger legends are recommended there. {note}
−
```datasheet
label: Equipment nameplate material
…7 unchanged lines
```datasheet
−label: Nameplate letter height
−type: select
−options:
− - "1/2 in. (minimum)"
− - "3/4 in. (mechanical-room equipment)"
− - "1 in. (large plant equipment)"
−default: "3/4 in. (mechanical-room equipment)"
−```
−
−```datasheet
label: Nameplate legend content
type: checkbox
…7 unchanged lines
```
−## Custom-engraved phenolic nameplates carry a 3 to 4 week fabrication lead time; the nameplate schedule shall be issued to the fabricator early enough to avoid a closeout schedule risk. {note}
+## Nameplate legend letter height shall be 1/2 in. minimum; 3/4 in. is recommended for mechanical-room equipment read from floor level and 1 in. for large plant equipment such as chillers and cooling towers.
+```datasheet
+label: Nameplate letter height
+type: select
+options:
+ - "1/2 in. (minimum)"
+ - "3/4 in. (mechanical-room equipment)"
+ - "1 in. (large plant equipment)"
+default: "3/4 in. (mechanical-room equipment)"
+```
+
+## Letter height drives legibility at the distance equipment is normally identified; a 1/2 in. legend is adequate at close range but plant-scale equipment is read across the room, so larger legends are recommended there. {note}
+
+## Custom-engraved phenolic nameplates carry a 3 to 4 week fabrication lead time; the nameplate schedule shall be issued to the fabricator early enough to avoid a closeout schedule risk.
+
## Motor and motor-controller nameplate marking, where specified alongside mechanical equipment, shall conform to NFPA 70 Article 409 and is coordinated with [[sync/equipment-labeling]]. {note}
…48 unchanged lines
## Warning tape shall include a metallic tracer to permit location of non-metallic buried lines.
−## Detectable tape color and legend shall follow the APWA color code for the buried service. {note}
+## Detectable tape color and legend shall follow the APWA color code for the buried service.
```datasheet
…38 unchanged lines
## Pipe markers shall be installed above all accessible ceilings and in ceiling plenums wherever piping is accessible, not only in mechanical rooms.
−## Limiting identification to mechanical rooms is a common omission; piping above accessible ceilings and in interstitial spaces is serviced by maintenance staff and shall be marked there as well. {note}
+## Limiting identification to mechanical rooms is a common omission; piping above accessible ceilings and in interstitial spaces is serviced by maintenance staff and shall be marked there as well.
## Markers shall be oriented so the legend is readable from the normal point of approach, with the legend on the lower half of pipe viewed from below and on the upper half of pipe viewed from above.
…37 unchanged lines
## Adhesive markers and labels shall be stored within the manufacturer's specified temperature and humidity range until installation to preserve adhesive performance.
−## Custom-engraved nameplates and tags shall be checked against the approved schedule on receipt and any discrepancy resolved before installation. {note}
+## Custom-engraved nameplates and tags shall be checked against the approved schedule on receipt and any discrepancy resolved before installation.
# Warranty {toc}
…26 unchanged lines
- Editable color and valve tag schedules
```