pipe
Enable an agent to recognise a pipe as a hollow conduit, assess its suitability and condition for a specified service, and identify the evidence needed before installation, operation or repair.
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.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise a pipe as a hollow conduit, assess its suitability and condition for a specified service, and identify the evidence needed before installation, operation or repair.
A pipe is a hollow, usually circular-section manufactured object intended primarily to convey fluids or other flowable materials, typically as a component of a connected piping system.
It can be Compare a candidate pipe with a specified medium, geometry, environment and operating envelope.; Check dimensional and material compatibility with proposed joints and connected components.; Identify suitable evidence for inspecting wall integrity, end condition and bore accessibility.; Determine whether cutting, joining, lining or cleaning is supported by the pipe construction and applicable procedure.; Flag a pipe for further assessment, restricted use or replacement when condition or rating evidence is insufficient..
Distinguishing features
Has an enclosed longitudinal bore intended to provide a passage for a transported medium, unlike a solid rod or an open channel.
Primarily provides a conduit length; a component whose principal purpose is branching, joining or changing flow direction may instead be a fitting.
Its declared purpose includes conveyance; a similar hollow section used only as a structural member does not meet the assumed scope.
Classification against tube, hose or duct requires intended service and the applicable product designation; shape, flexibility or diameter alone is insufficient.
Scope
+ Pipe geometry, bore continuity, wall dimensions and end preparation
+ Wall materials, manufacturing construction, linings and coatings
+ Declared service, transported medium and operating limits
+ Interfaces with joints, supports and connected equipment
+ Pipe condition, inspection evidence and readiness for an intended action
- Complete piping networks, their routing and hydraulic design
- Separate fittings, valves, pumps, connectors and support assemblies
- The transported substance and its independent material model
- Structural hollow sections whose intended role is load bearing rather than conveyance
- Smoking pipes, musical pipes and software pipes
Characteristics
- Intended service
- Declared medium and service, such as water supply, drainage, gas conveyance or process transport; unknown Establishes which compatibility, cleanliness and operating requirements need evaluation.
- Nominal size designation
- Designation with its sizing system and referenced document Supports product identification without treating a nominal label as a measured bore or outside diameter.
- Cross-sectional dimensions
- Outside diameter, inside diameter or noncircular dimensions in mm, with measurement location Determines passage geometry and dimensional compatibility with mating components.
- Wall thickness
- Nominal and measured thickness in mm, including minimum measured thickness and location Supports evaluation of containment capability and local wall loss.
- Length
- mm or m, stating whether overall or effective installed length Affects fit, handling and the amount of conduit provided.
- Wall construction
- Material grade and construction, such as seamless, welded, extruded, cast or multilayer; unknown Influences joining methods, degradation mechanisms and inspection choices.
- Lining and coating
- Internal and external treatment, material and coverage; absent; unknown May govern medium compatibility, corrosion protection and preparation for joining.
- Declared operating envelope
- Linked rating evidence stating pressure in kPa or bar, temperature in °C, service conditions and applicable restrictions Prevents a pressure value from being used without its temperature, material and service qualifications.
- End interface
- Plain, bevelled, threaded, socket, spigot, flanged or other declared configuration, with dimensions and designation Determines which joints and preparation methods may be compatible.
- Integrity and bore condition
- Recorded defects, obstruction, leakage and contamination, with inspection method, extent and date; unassessed Distinguishes observed condition from an unsupported claim that the pipe is fit for service.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.pipe-artifact
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 30 questions.
Conduit identity and boundary Establishes the intended pipe sense and the physical extent represented by an observation.
Hollow products can look alike while belonging to different kinds, and a pipe length must not be confused with its surrounding piping system.
Pipe kind recognition
Tests whether an item is a conveyance pipe within the assumed registry sense.
Conveyance role
Record the intended passage function and evidence supporting classification as a pipe.
- What medium or class of media is the hollow passage intended to convey? definition
- What designation or intended use distinguishes this item from tube, hose, duct or structural hollow section? boundary
Pipe extent
Separates the pipe body and integral features from neighbouring components.
Length and component boundaries
Identify the ends of the represented pipe length and the ownership of attached features.
- Where does the represented pipe begin and end: at cut faces, joint interfaces or another documented boundary? boundary
- Which sockets, flanges, liners or other features are integral to this pipe, and which are separate connected components? boundary
Bore, wall and construction Captures the dimensions and construction that create the transport passage and containing wall.
Nominal size alone cannot establish passage capacity, mating dimensions or the condition of the containing wall.
Passage and wall geometry
Separates size designations from measured geometry.
Dimensional basis
Record bore, outside dimensions, thickness and length with their measurement or designation basis.
- What are the nominal size designation and sizing system, and which dimensions does that designation actually specify? definition
- What bore dimensions, outside dimensions, wall thickness and length are measured, in which units and at which locations? measurement
Wall material and surfaces
Identifies the load-containing wall and internal or external material layers.
Construction and treatment evidence
Record material grade, manufacturing construction and protective treatments without inferring them from appearance alone.
- What markings, certificates or examinations establish the wall material, grade and manufacturing construction? provenance
- Which internal liners, external coatings or reinforcement layers are present, and what are their thicknesses and coverage where known? measurement
Service and containment envelope Relates transported media and exposure conditions to documented pipe limits.
Pipe suitability depends on combined service conditions rather than a material name or isolated pressure label.
Medium and exposure
Captures what contacts the inside and outside of the pipe.
Service compatibility
Identify relevant medium properties and environmental exposures for compatibility assessment.
- What medium, phase, temperature range and relevant constituents or entrained solids are expected inside the pipe? measurement
- What evidence supports compatibility of the wall, lining and coating with the internal medium and external exposure? provenance
Ratings and operating conditions
Makes the conditions and limitations attached to declared ratings explicit.
Qualified containment limits
Record applicable operating limits separately from test conditions and whole-system limits.
- Which manufacturer document or applicable standard, including issuer and edition, establishes the pipe's pressure and temperature limits for this service? provenance
- Does the intended duty include pressure surges, vacuum, external pressure or temperature cycling that requires additional assessment? action
- Which stated limits apply to this pipe body, and which depend on joints, fittings or the complete installed system? boundary
Joining and installation interfaces Describes how a pipe can be connected and accommodated within an installation.
A suitable pipe body can still be unusable when its ends, support conditions or movement requirements are incompatible with the installation.
Ends and joint compatibility
Records the pipe-side geometry and preparation required for a proposed joint.
Joinable end condition
Assess whether the pipe ends and construction support the intended connection method.
- What end configurations, dimensions, tolerances and surface conditions must match the proposed mating components? measurement
- Which documented joining procedure applies to this material and construction, including any liner or coating preparation? action
Support and movement
Records installation conditions that impose loads or constrain pipe movement.
Installation load compatibility
Identify support, bending and restraint requirements needing assessment by the installation model.
- What burial, support spacing, bending, restraint or thermal movement conditions will the pipe experience? measurement
- What pipe-specific limits or installation instructions must the network or support design satisfy? action
Integrity, inspection and intervention Connects observed wall and bore condition to evidence-based decisions about use and maintenance.
External appearance alone does not establish bore cleanliness, remaining wall integrity or readiness for intervention.
Wall and bore assessment
Separates observed defects from unexamined portions of the pipe.
Defect and obstruction evidence
Record the location, extent and inspection basis of damage, leakage, deposits or blockage.
- Where are wall loss, cracks, deformation, lining damage, leakage or bore obstruction observed, and how extensive are they? measurement
- Which inspection methods and dates support these observations, and which internal or external regions remain unexamined? provenance
Action readiness
Identifies the pipe-specific evidence and connected-system conditions needed before intervention or return to service.
Intervention and return to service
Relate proposed cleaning, cutting, repair or reuse to verified condition and applicable procedures.
- Before opening, cutting or cleaning this pipe, what evidence confirms the required isolation, pressure release, drainage and removal of hazardous residues? action
- What applicable acceptance criteria, examinations or tests determine whether the pipe can return to its intended service after the proposed intervention? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The registry records no sense; this description assumes a conveyance pipe, rather than a smoking pipe, musical pipe, or software pipe.
- Standards are recalled without checking editions or applicability to a particular service; pressure ratings require material, dimensions, temperature, joints, and the governing design rules.
- The nominal-size range is an illustrative building-services range, not a universal range or a researched distribution.
- Which of these check these first hold for the sense of pipe this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Steel pipe
- Ductile iron pipe
- Copper pipe
- Plastic pipe
- Concrete pipe
- Composite pipe
- Which of these kinds and varieties hold for the sense of pipe this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Nominal Pipe Size (NPS) - NPS followed by a size designation, such as NPS 2 - A nominal size designation used particularly in North American practice; it does not generally equal the measured outside or inside diameter.
- Nominal diameter (DN) - DN followed by a number, such as DN 50 - A dimensionless nominal size designation defined by ISO 6708, not an exact measured diameter in millimetres.
- Pipe schedule - Schedule 40, Schedule 80, or stainless-steel designations such as 10S - Identifies a wall-thickness series within an applicable dimensional standard; thickness also depends on nominal size, and schedule alone is not a pressure rating.
- Which of these identifiers and schemes hold for the sense of pipe this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- ASME B36.10M, issued by the American Society of Mechanical Engineers: dimensions of welded and seamless wrought steel pipe.
- ASME B36.19M, issued by the American Society of Mechanical Engineers: dimensions of stainless steel pipe.
- ASTM A53/A53M, issued by ASTM International: requirements for black and hot-dipped zinc-coated welded and seamless steel pipe.
- ASTM D1785, issued by ASTM International: PVC plastic pipe in Schedules 40, 80, and 120.
- ISO 6708, issued by the International Organization for Standardization: definition and selection of DN nominal sizes for pipework components.
- Which of these standards and regulation hold for the sense of pipe this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Distribution of drinking water and collection of wastewater.
- Transport of oil, gas, and industrial process fluids.
- Circulation of heating, cooling, and refrigeration fluids.
- Conveyance of slurries or pneumatically transported bulk solids.
- Structural applications such as piles, posts, and frames.
- Which of these real-world use hold for the sense of pipe this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Nominal diameter in common building services - Approximately DN 15-DN 100; illustrative only, with much larger sizes used in infrastructure - Dimensionless DN designation
- Which of these typical measurements hold for the sense of pipe this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Internal or external corrosion, erosion, or chemical degradation causing wall loss and leakage.
- Rupture from excessive pressure, pressure surges, or freezing of confined contents.
- Joint or seal failure caused by poor assembly, movement, or incompatible materials.
- Blockage from deposits, debris, or biological growth, reducing flow or causing backups.
- Cracking, buckling, or collapse under fatigue, thermal movement, external loads, or inadequate support.
- Which of these failure modes and hazards hold for the sense of pipe this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- North American specifications commonly use NPS and schedule designations; many other regions commonly use DN and metric dimensional systems.
- Local plumbing, gas, and drinking-water rules differ in permitted materials, joining methods, and approval requirements.
- Which of these regional variation hold for the sense of pipe this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- tube - The distinction depends on industry and standard: pipe is commonly specified by nominal bore-related size and wall series, whereas tube is commonly specified by actual outside diameter and wall thickness.
- hose - A hose is designed for flexibility and movement; pipe generally forms a more fixed installation, although some plastic pipe is flexible.
- duct - A duct commonly carries air or gases through a ventilation passage, often of noncircular section; service and the applicable specification distinguish it from pipe.
- pipeline - A pipeline is an assembled transport system or route comprising connected pipes and associated equipment, rather than an individual pipe or pipe kind.
- pipe fitting - A fitting joins, branches, terminates, or changes the direction or size of a pipe run.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of pipe this model covers, and on what evidence? provenance
What the second pass must settle
- Does vr.tr.pipe denote the fluid-conveyance sense assumed here, or another physical sense of pipe?
- Does an existing Vercy world model already own this concept, requiring a registry link instead of a separate publication?
- How does the registry distinguish pipe from tube, hose, duct and structural hollow section, including flexible or noncircular products?
- Which product and service standards, issuing bodies and editions apply to the pipe families this entry must cover?
- Which material-specific rating rules, degradation mechanisms and acceptance criteria require specialised extensions rather than assertions in this generic pipe model?