fire hydrant
Let an agent handle fire hydrants by type, location, marking, maintenance and rules on access and misuse.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent handle fire hydrants by type, location, marking, maintenance and rules on access and misuse.
A connection point on a water main from which firefighters draw water, either above-ground pillar hydrants or underground hydrants under a cover, marked by signs showing location and pipe size.
What it is for: Supplying water for firefighting.
It can be locate hydrants from markers; keep hydrants clear; inspect and flush them; report damage or leaks.
Distinguishing features
Firefighting water supply
Above or below ground
Marked for quick location
Unauthorised use is prohibited
What it looks like
Coloured pillar hydrants on pavements or covers in the road with nearby marker signs.
Physical character
main diameter: 80-300 mm - typical, shown on markers
How it is recognised
Pillar hydrants
Underground hydrant covers and H signs
Colour codes for flow in some countries
Related models
is a kind of - category
is connected to - infrastructure
is used by - user
is maintained by - maintainer
In practice
Families and kinds
pillar hydrants
underground hydrants
dry and wet barrel hydrants
private site hydrants
Standards and regulation
EN 14384 pillar fire hydrants
EN 14339 underground hydrants
NFPA 291 flow testing and marking
Parking rules near hydrants
Failure modes and hazards
Blocked or hidden hydrants
Unauthorised opening causing pressure loss
Damaged or frozen hydrants
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Type Which hydrant.
Type decides use.
Kind
Pillar or underground.
Kind
Hydrant type.
- Is it a pillar or underground hydrant? definition
- What main size does it serve? measurement
Marking
Signs and colours.
Marking
Marking.
- What do the marker sign and colour indicate? definition
- Which national convention applies? provenance
Maintenance Readiness.
Hydrants must work when needed.
Inspection
Testing.
Inspection
Inspection.
- When was it last inspected and flow-tested? provenance
- Who is responsible? provenance
Faults
Reporting.
Faults
Fault reporting.
- How is a damaged or leaking hydrant reported? action
- To whom? provenance
Access Keeping clear.
Access saves time in fires.
Clearance
Parking and obstruction.
Clearance
Clearance.
- What parking and clearance rules apply near hydrants? provenance
- Is it covered by snow or vegetation? boundary
Misuse
Unauthorised use.
Misuse
Misuse.
- Is opening the hydrant authorised? boundary
- Why is unauthorised use dangerous? definition
Planning Coverage.
Coverage protects areas.
Coverage
Spacing.
Coverage
Coverage.
- Is hydrant spacing adequate for the area? boundary
- Which standard applies? provenance
Flow
Capacity.
Flow
Flow capacity.
- What flow and pressure can it deliver? measurement
- From which test? provenance
What the second pass must settle
- Should hydrant types be separate entries?
- How should hydrant maps be linked?
- How should marking conventions be recorded by country?