Flange Type · Facing · Drilling
Industrial Pipe Flanges
Pipe flanges specified by dimensional standard, pressure designation, material, bore, sealing face and matching bolt pattern.
Specification basis
Confirm the applicable drawing and requirements
Inspection scope
Defined against the approved order
Category Industrial Pipe Flanges Flange Type · Facing · Drilling Class 2500 stops at NPS 12
NPS 24
Specification input
RTJ where specified
RF / FF
Specification input
About this range
Match the entire bolted joint
Pipe flanges create a removable connection between pipes, valves and equipment nozzles. JINYI’s industrial pipe flanges range includes weld neck, long weld neck, slip-on, threaded, plate and blind flanges, together with spectacle blinds and drawing-based rings or blanks. Select the flange as part of a joint with compatible gaskets, fasteners and mating faces. The nominal diameter and a pressure-class label are not enough to confirm interchangeability. ASME pipe flanges and EN-pattern flanges require their own dimensional and rating checks.
- ASME B16.5 covers Classes 150–1500 in NPS 1/2–24 and Class 2500 in NPS 1/2–12. These are standard scope limits, not a blanket statement of JINYI stock or manufacturing capacity.
- For larger ASME-pattern connections, B16.47 covers NPS 26–60. Identify Series A or Series B because the dimensions must match the mating flange.
- A flange Class is a rating designation, not the allowable pressure in psi. Determine allowable pressure from the specified material and temperature table.
- Match RF, FF or RTJ facing with the correct gasket system and mating equipment. Specify sealing-surface finish and groove details where applicable.
- For weld neck flanges, identify pipe OD, bore, wall thickness or schedule and weld-end preparation. A matching bolt circle does not establish a matching weld end.
- Treat plate flanges, forged flanges, spectacle blinds and tube sheets as distinct product forms. A ring blank is not automatically a pressure-rated finished flange.
Featured industrial pipe flanges
Selected industrial pipe flanges for project enquiries. Compare the connection, installation and specification details, then request a quotation for your required configuration.
See the full catalogueA weld neck flange connects a pipe to a bolted flange joint through a projecting neck with a butt-weld end. Specify dimensions, material and service conditions…
Weld Neck Flange
View detailsA blind flange closes an open flanged connection on a pipe, nozzle or equipment outlet. Specify dimensions, material and service conditions for a Jinyi quotation.
Blind Flange
View detailsASME B16.5 · NPS 4 · Class 150 RF. Industry dimensional reference; Material, dimensions and commercial terms confirmed with your quotation.
Slip On Flange
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A plate flange is a flat, bored ring with a drilled bolt pattern for a specified flanged connection. Specify dimensions, material and service conditions for a…
Plate Flange
View detailsEN 1092-1 type 13 · thread specified separately. Material, dimensions and commercial terms confirmed with your quotation.
Threaded Flange
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A spectacle blind combines a solid line blank and an open spacer ring connected by a bridge. Specify dimensions, material and service conditions for a Jinyi…
Spectacle Blind
View detailsIndustrial Pipe Flanges catalogue
Browse 13 products in this category. Search the range or compare the available enquiry options. Final materials, dimensions and ratings are confirmed against the selected product and your specification.
Showing 1–13 of 13 products
A blind flange closes an open flanged connection on a pipe, nozzle or equipment outlet. Specify dimensions, material and service conditions for a Jinyi quotation.
Blind Flange
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Tube-hole layout and thickness to exchanger drawing. Material, dimensions and commercial terms confirmed with your quotation.
Heat Exchanger Tube Sheet
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A long weld neck flange combines a drilled flange with an extended neck for a specified nozzle or connection arrangement. Specify dimensions, material and service conditions…
Long Weld Neck Flange
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Annular machined blank. Material, dimensions and commercial terms confirmed with your quotation.
Machined Ring Blank
View detailsA plate flange is a flat, bored ring with a drilled bolt pattern for a specified flanged connection. Specify dimensions, material and service conditions for a…
Plate Flange
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Profiled annular blank. Material, dimensions and commercial terms confirmed with your quotation.
Profiled Ring Blank
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Curved ring segment. Material, dimensions and commercial terms confirmed with your quotation.
Segment Ring Blank
View detailsASME B16.5 · NPS 4 · Class 150 RF. Industry dimensional reference; Material, dimensions and commercial terms confirmed with your quotation.
Slip On Flange
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Solid circular blank. Material, dimensions and commercial terms confirmed with your quotation.
Solid Disc Blank
View detailsA spectacle blind combines a solid line blank and an open spacer ring connected by a bridge. Specify dimensions, material and service conditions for a Jinyi…
Spectacle Blind
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Split annular blank. Material, dimensions and commercial terms confirmed with your quotation.
Split Ring Blank
View detailsEN 1092-1 type 13 · thread specified separately. Material, dimensions and commercial terms confirmed with your quotation.
Threaded Flange
View detailsA weld neck flange connects a pipe to a bolted flange joint through a projecting neck with a butt-weld end. Specify dimensions, material and service conditions…
Weld Neck Flange
View detailsProduct capabilities
Bore, facing and bolt-circle accuracy
Carbon steel pipe flanges to ASME B16.5 need a defined material specification as well as dimensional compliance. For stainless steel pipe flanges for process piping, give the exact grade and service conditions instead of relying on a generic stainless description. The purchase drawing should identify outside diameter, thickness, hub geometry, bore, bolt circle, hole count and face finish. Special rings, blanks and heat-exchanger tube sheets belong to a drawing-controlled route with their own engineering requirements; catalogue similarity is not a design approval.
- Rating: Class or PN designation
- Facing: RF / FF / RTJ
- Bore: Pipe wall or schedule
- Drilling: PCD + hole count + diameter
Specification
B16.5 scope
NPS 24
Class 2500 stops at NPS 12
Facing
RF / FF
RTJ where specified
Four checks before specifying pipe flanges
Use these checks to define the pipe flanges assembly before comparing prices. Record the decision against the drawing revision and obtain confirmation of the proposed model’s limits.
- Establish the standard Confirm dimensional standard, edition, flange type, nominal size, pressure designation and facing.
- Define material and bore Specify material grade, heat-treatment condition, pipe wall, bore and any corrosion allowance.
- Check the mating assembly Compare bolt circle, hole size, gasket seating, bolting and available assembly clearance.
- Approve inspection scope Agree dimensional report, material documents, additional NDT or PMI and the marking requirements.
Dimensions and service conditions should be agreed before ordering.
Carbon steel pipe flanges to asme b16.5
For pipe flanges, send the standard and edition, type, DN/NPS, Class/PN, facing, material grade and bore or pipe schedule. Add design pressure and temperature, gasket and bolting requirements, quantities, inspection scope and any mating-equipment drawing.
- Weld neck interfaces Include bore tolerance, weld bevel, hub dimensions and the mating pipe schedule on the enquiry drawing.
- Blind flanges and isolation State blind-flange or line-blank type, pressure/temperature duty and the required gasket-face configuration.
- Rings and plate blanks Supply OD, ID, thickness, flatness, machining allowance and whether the item is a blank or a finished component.
- Tube sheets Provide the tube-hole layout, pitch, ligament requirements, drilling tolerances and the governing exchanger design.
Send drawings and the item schedule with your enquiry.
Inspection requirements for pipe flanges
Flange inspection should verify the features that control alignment and gasket seating. The applicable standard and approved drawing define tolerances. Request material traceability and the agreed inspection documents; dimensional conformity should not be described as an ASME or ISO certification.
Inspection checklist
Specify in the order- Flange dimensionsOD, thickness, bore, hub geometry and weld-end details.
- Bolt patternPitch-circle diameter, hole number, diameter and orientation.
- Sealing faceFacing type, finish, flatness and RTJ groove dimensions where required.
- Material recordsGrade and heat identity matched to the specified inspection document.
- Special examinationsPMI, hardness or NDT only to the scope agreed in the order.
Order documentation
Scope to confirm- Approved drawingDimensions, revision and acceptance criteria
- Material recordSpecify traceability and document type
- Inspection reportAgree measured items and test scope
- Project approvalsConfirm any required certificates before ordering
Quality
Inspection · gauging
Standards · documents
Review checkpoints
Document control
Six inspection planning steps
A purchase-order checklist- 1
Drawing review
Confirm the specification, revision and the selected pipe flanges configuration.
- 2
Flange dimensions
OD, thickness, bore, hub geometry and weld-end details.
- 3
Bolt pattern
Pitch-circle diameter, hole number, diameter and orientation.
- 4
Sealing face
Facing type, finish, flatness and RTJ groove dimensions where required.
- 5
Material records
Grade and heat identity matched to the specified inspection document.
- 6
Special examinations
PMI, hardness or NDT only to the scope agreed in the order.
Applications and specification priorities
Common application contexts for pipe flanges. Each installation needs a service-specific selection; the entries below describe engineering priorities, not customer projects or approvals.
Technical selection and common questions
ASME B16.5 scope
Read the reference scope
Confirm applicability to your selected designASME B16.47 large flanges
Read the reference scope
Confirm applicability to your selected designASME B16.48 line blanks
Read the reference scope
Confirm applicability to your selected design
Dimension schedule
Record these fields on a drawing or item schedule. Each quotation for pipe flanges should identify the proposed configuration and any departure from the specified interface.
Discuss your specification
Service and installation
Include these conditions with the pipe flanges enquiry. A useful comparison checks technical compliance, inspection scope and installation requirements before comparing unit price.
Discuss your specificationSelection questions
Is Class 150 the same as 150 psi?
No. A flange class identifies a group of pressure–temperature ratings. The allowable pressure depends on material, temperature and the applicable standard table.
Will ASME and EN flanges bolt together?
Do not assume so. Compare outside diameter, bolt circle, holes, facing and gasket dimensions against the actual mating drawing, even where nominal sizes appear similar.
Need help with a specific drawing? Include the service conditions in your enquiry.
Discuss your specificationInstallation questions
Which flange is used to close a line?
A blind flange closes a flanged opening. A spectacle blind is a different isolation component installed between flanges; its dimensions and handling arrangement must suit the joint.
Can a machined ring be called a rated flange?
Only when the finished design, material, manufacture and inspection meet the required specification. A ring blank or tube sheet has a different function and should retain its own drawing identity.
Need help with a specific drawing? Include the service conditions in your enquiry.
Discuss your specificationRelated products for your assembly
Explore complementary products from other JINYI categories. Check each product’s dimensions and connection requirements against your assembly drawing.
See the full catalogue
- Nominal size
- 4 in / DN100
- Pipe outside diameter
- 114.3 mm
- Bend angle
- 90°
- Centreline radius
- 152.4 mm
90 Degree Pipe Elbow
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- Nominal size
- 4 in / DN100
- Pipe outside diameter
- 114.3 mm
- Overall length L
- 70 mm
- Flange outside diameter X
- 220 mm
Grooved Flange Adapter
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- Nominal size
- DN100 / 4 in
- Face-to-face length
- 150 mm
- Axial extension
- 10 mm
- Axial compression
- 19 mm
Rubber Expansion Joint
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- Nominal access size
- 24 in / 609.6 mm
- Overall listed length
- 990.6 mm
- Overall listed width
- 838.2 mm
- Overall listed height
- 406.4 mm
Round Bolted Manway
View detailsRequest a pipe flanges quotation
For pipe flanges, send the standard and edition, type, DN/NPS, Class/PN, facing, material grade and bore or pipe schedule. Add design pressure and temperature, gasket and bolting requirements, quantities, inspection scope and any mating-equipment drawing.
Attach the approved drawing, item schedule and service conditions. Identify mandatory documents, inspection hold points and delivery requirements when requesting a quotation.
- Drawing-based review
- Service-specific selection
- Inspection scope agreed