Pipe and piping fittings
Cap
Closing a line end or providing positive isolation
Specialist selection guide
What should be reviewed before selecting this product?
Cap belongs to the Butt-weld fittings family. Technical selection must start from actual service conditions, followed by verification of dimensions, pressure-temperature duty, material, connection, construction standard, testing and manufacturer documentation against the project piping class.
Technical selection path
- 1
Extract size and schedule from the project specification and verify it against the manufacturer proposal
- 2
Extract radius and angle from the project specification and verify it against the manufacturer proposal
- 3
Extract reduction type from the project specification and verify it against the manufacturer proposal
- 4
Extract material grade from the project specification and verify it against the manufacturer proposal
- 5
Extract dimensional tolerance from the project specification and verify it against the manufacturer proposal
- 6
Extract testing and certification from the project specification and verify it against the manufacturer proposal
Key strengths
- Selection within the established Butt-weld fittings family
- Compatibility review across project materials and connections
- Structured technical comparison before final enquiry
Selection limitations
- A trade name or product name alone does not define the technical specification
- Pressure-temperature limits depend on material, design and standard edition
- Substitution requires dimensional, functional and documentation verification
Typical applications
Where can this option be considered?
- Evaluation for Oil and gas projects subject to service-condition approval
- Evaluation for Refining projects subject to service-condition approval
- Evaluation for Petrochemical projects subject to service-condition approval
Reference standards
A standard does not replace the project specification
ASME B16.9Reference relevant to Cap selection, dimensions, materials or testing; the required edition must be stated in the orderASME B16.28Reference relevant to Cap selection, dimensions, materials or testing; the required edition must be stated in the orderMSS SP-75Reference relevant to Cap selection, dimensions, materials or testing; the required edition must be stated in the order
Common technical questions
Concise answers before enquiry
What information is required to enquire about Cap?
At minimum provide size and schedule, radius and angle, reduction type, material grade, dimensional tolerance and fluid conditions. Final documentation requirements follow the project specification.
Are two Cap products with the same name interchangeable?
No. Installation dimensions, pressure-temperature rating, wetted materials, connection, test method and material certification must be checked independently.
Line ends, future tie-ins, testing or maintenance
Trapped pressure, venting, safe removal procedure and wall thickness
Initial review sheet
Technical attributes to review
Final values must come from project specifications, calculations and manufacturer data. This table defines the information scope.
FamilyButt-weld fittings
Main groupPipe and piping fittings
Materials to evaluateCarbon steel, Stainless steel, Alloy steel, Nickel alloy
Connections to evaluateButt-weld
Typical mediaProcess, Steam, Gas, Liquid
Relevant industriesOil and gas, Refining, Petrochemical, Power generation, Water and utilities
Reference standardsASME B16.9 · ASME B16.28 · MSS SP-75
Enquiry checklist
Include this information with your request
Size and schedule
Radius and angle
Reduction type
Material grade
Dimensional tolerance
Testing and certification
Before substitution
A matching name does not guarantee interchangeability
Installation dimensions, pressure rating, wetted materials, sealing design, construction standard, testing and documentation must be checked independently.
Adjacent types
Other options in this family
Final technical approval is required
This page is educational and intended for initial screening. Final selection must be approved against project requirements, actual service conditions and manufacturer documentation.
Send request for review