Integral and Welded Straight Pipes for Oilfield Flowlines

Description

Goldenman High-Pressure Pup Joints are rigid straight-flowline sections used to connect pumps, manifolds, swivel joints, hoses, wellhead equipment and pressure-control assemblies.

The product range covers nominal sizes from 1 to 4 inches, rated working pressures from 2,000 to 15,000 psi, and standard lengths from 1 to 2.8 meters.

Available end connections include:

• Fig 206 Hammer Union
• Fig 402 Hammer Union
• Fig 602 Hammer Union
• Fig 1002 Hammer Union
• Fig 1502 Hammer Union
• Metric TR Union
• API Flanged Ends
• Studded and combination connections
• Custom union-to-flange configurations

The complete product series includes:

• Pressure-Seal Pup Joints
• Non-Pressure-Seal Pup Joints
• Integral Pup Joints
• Sour-Service Integral Pup Joints
• Welded-Union Pup Joints
• Welded-Flange Pup Joints
• Union-by-Flange Straight Pipes
• Custom-Length High-Pressure Flowline Pipes

Product Short Description

Goldenman High-Pressure Pup Joints provide rigid, full-bore flow connections for cementing, fracturing, drilling, well testing, flowback and production operations.

Integral configurations are manufactured from high-strength alloy steel with no circumferential weld in the principal pressure-carrying tube section. Welded configurations use qualified union or flange end subs joined to a heavy-wall alloy-steel pipe body.

Fig 602, Fig 1002 and Fig 1502 Hammer Union configurations provide fast field connection to compatible high-pressure flowline equipment. API flanged configurations connect directly to wellheads, manifolds, valves, spools and pressure-control equipment.

Product Highlights

• Nominal sizes from 1 to 4 in
• Rated working pressures from 2,000 to 15,000 psi
• Fig 206, 402, 602, 1002 and 1502 Hammer Unions
• Integral and welded constructions
• Pressure-seal and non-pressure-seal union options
• Standard-service and H₂S-service configurations
• Standard lengths from 1 to 2.8 m
• Custom lengths and end combinations
• Full-bore internal flow passage
• High-strength 4130 and 4140 alloy-steel options
• Quenched-and-tempered pressure-containing components
• API 6A flanged-end configurations
• Union-by-union and union-by-flange designs
• Sour-service hardness control
• NACE MR0175/ISO 15156 material options
• Replaceable Hammer Union seal rings
• Color-coded and permanently marked connections
• Full material and heat-number traceability
• UT and MPI inspection
• Hydrostatic proof testing
• EN 10204 3.1 material documentation
• Complete inspection and test records

General Technical Specifications

Parameter	Available Range
Product	High-Pressure Pup Joint / Straight Pipe
Nominal size	1, 1-1/2, 2, 3 and 4 in
Rated working pressure	2,000–15,000 psi
Pressure units	14–105 MPa
Standard lengths	1, 1.5, 2, 2.5 and 2.8 m
Approximate imperial lengths	3.3, 4.9, 6.6, 8.2 and 9.2 ft
Custom length	Manufactured to project drawing
Construction	Pressure seal, non-pressure seal, integral or welded
Union connections	Fig 206, 402, 602, 1002 and 1502
Flanged connections	2-1/16–4-1/16 in API flanges
Working temperature	−29°C to 121°C
Temperature designation	Class PU
Main material	High-strength alloy steel
Common material grades	AISI 4130 and AISI 4140
Heat treatment	Normalized or quenched and tempered
Service	Standard and H₂S-containing fluid service
Internal bore	Full bore
End combinations	Union × Union, Flange × Flange and Union × Flange
Surface protection	Phosphate, paint or project-specific coating
NDE	UT and MPI
Pressure testing	Hydrostatic proof test
Documentation	Material, dimensional, NDE and pressure-test reports

Union Size and Pressure Range

Pressure-Seal Pup Joints

Hammer Union	Rated Working Pressure	Available Nominal Sizes
Fig 402	4,000 psi / 28 MPa	1, 1-1/2, 2 and 3 in
Fig 602	6,000 psi / 42 MPa	1, 1-1/2, 2 and 3 in
Fig 1002	10,000 psi / 70 MPa	1, 1-1/2, 2, 3 and 4 in
Fig 1502	15,000 psi / 105 MPa	1, 1-1/2, 2 and 3 in

Non-Pressure-Seal Pup Joints

Hammer Union	Rated Working Pressure	Available Nominal Sizes
Fig 206	2,000 psi / 14 MPa	1, 1-1/2 and 2 in
Fig 602	6,000 psi / 42 MPa	1, 1-1/2 and 2 in
Fig 1002	10,000 psi / 70 MPa	1, 1-1/2, 2 and 3 in
Fig 1502	15,000 psi / 105 MPa	1, 1-1/2 and 2 in

Conventional Integral Pup Joints

Hammer Union	Rated Working Pressure	Available Nominal Sizes
Fig 602	6,000 psi / 42 MPa	1, 1-1/2 and 2 in
Fig 1002	10,000 psi / 70 MPa	1, 1-1/2 and 2 in
Fig 1502	15,000 psi / 105 MPa	1, 1-1/2 and 2 in

H₂S-Service Integral Pup Joints

Hammer Union	Rated Working Pressure	Available Nominal Sizes
Fig 602	5,000 psi / 35 MPa	1, 1-1/2 and 2 in
Fig 1002	7,500 psi / 53 MPa	1, 1-1/2 and 2 in
Fig 1502	10,000 psi / 70 MPa	1, 1-1/2 and 2 in

Welded-Union Pup Joints

End Connection	Rated Working Pressure	Available Nominal Sizes
Fig 402	4,000 psi / 28 MPa	1, 1-1/2 and 2 in
Metric TR Union	5,000 psi / 35 MPa	1, 1-1/2 and 2 in
Fig 602	6,000 psi / 42 MPa	1, 1-1/2 and 2 in
Fig 1002	10,000 psi / 70 MPa	1, 1-1/2, 2 and 3 in
Fig 1502	15,000 psi / 105 MPa	1, 1-1/2 and 2 in

Flanged Pup Joint Range

API Flange Size	Available Working Pressures
2-1/16 in	3,000, 5,000, 10,000 and 15,000 psi
2-9/16 in	3,000, 5,000, 10,000 and 15,000 psi
3-1/8 in	3,000 and 5,000 psi
3-1/16 in	10,000 and 15,000 psi
4-1/16 in	3,000, 5,000, 10,000 and 15,000 psi

Flanged Pup Joints use API ring-type end connections matched to the connected valve, spool, manifold or wellhead equipment.

Complete flange packages include:

• Ring gaskets
• Studs
• Nuts
• Protective flange covers
• Material documentation
• Dimensional records

4-Inch High-Pressure Pup Joint

The 4-inch High-Pressure Pup Joint provides a large full-bore flow path for high-rate pumping and manifold service.

Available 4-inch configurations include:

• 4 in Fig 1002 pressure-seal Hammer Union
• 4-1/16 in API flanged straight pipe
• 4-1/16 in × 3,000 psi flange
• 4-1/16 in × 5,000 psi flange
• 4-1/16 in × 10,000 psi flange
• 4-1/16 in × 15,000 psi flange
• Union-by-flange combination Pup Joint
• Flange-by-flange straight pipe
• Custom overall length

The large-bore configuration is used in:

• High-rate cementing systems
• Fracturing manifolds
• Flowback systems
• Well-test manifolds
• Production flowlines
• Water-injection systems
• High-volume drilling-fluid lines

Pressure-Seal Construction

Pressure-Seal Pup Joints use a replaceable sealing element within the Hammer Union connection.

The connection consists of:

• Male union sub
• Female union sub
• Wing nut
• Pressure seal ring
• Union sealing shoulder
• Threaded engagement area
• Identification markings

The pressure seal ring provides the primary fluid barrier after the union is fully engaged.

Seal-ring materials include:

• NBR
• HNBR
• FKM
• PTFE-supported elastomers
• Low-temperature compounds
• Sour-service compounds

The seal material is selected according to fluid chemistry, pressure and temperature.

Non-Pressure-Seal Construction

Non-Pressure-Seal Pup Joints use the specified union face and nose geometry without a separate pressure-seal-ring arrangement.

The connection is manufactured with controlled:

• Nose profile
• Contact angle
• Union shoulder
• Thread dimensions
• Concentricity
• Surface finish
• Wing-nut engagement

This construction is supplied as a complete matched connection system.

Integral Pup Joint

An Integral Pup Joint is manufactured from a continuous high-strength alloy-steel pressure body.

The union-end profiles and straight pipe section form an integrated pressure-containing component.

The integral construction provides:

• No circumferential weld in the main pressure path
• Uniform material properties
• High resistance to pressure cycling
• Controlled bore alignment
• Reduced weld-related inspection points
• Compact end-transition geometry
• Strong performance in severe pumping service

Integral Pup Joints are used in:

• Fracturing
• Cementing
• High-pressure well testing
• Acidizing
• Flowback
• High-cycle manifold systems

Welded-Union Pup Joint

A Welded-Union Pup Joint consists of:

• Heavy-wall pipe body
• Male or female union end subs
• Qualified full-penetration welds
• Heat-affected-zone control
• Post-weld inspection
• Hydrostatic pressure testing

The welded construction provides flexible size, length and connection combinations.

Welded Pup Joints are used for:

• Custom manifold layouts
• Longer straight sections
• Union-to-union adapters
• Union-to-flange transitions
• Replacement of existing flowline sections
• Project-specific connection arrangements

Welds are completed under qualified welding procedures and inspected using the specified NDE method.

Welded-Flange Pup Joint

Welded-Flange Pup Joints connect high-pressure piping to API flanged valves, manifolds and wellhead equipment.

Available arrangements include:

• Flange × Flange
• Flange × Male Hammer Union
• Flange × Female Hammer Union
• Flange × Threaded End
• Equal-size and reducing-bore configurations

The flange ends are manufactured with the required:

• Nominal bore
• Working-pressure class
• Bolt-circle diameter
• Ring groove
• Flange thickness
• Stud-hole pattern
• Raised or ring-type face
• Overall face-to-face length

Hammer Union Figure Selection

Fig 206

Fig 206 provides a 2,000 psi connection for lower-pressure service.

Applications include:

• Low-pressure mud lines
• Water lines
• General fluid transfer
• Low-pressure manifold connections

Fig 402

Fig 402 provides a 4,000 psi pressure-seal connection.

Applications include:

• Cementing support lines
• Medium-pressure mud systems
• Pump-discharge connections
• General oilfield flowlines

Fig 602

Fig 602 provides a standard 6,000 psi rating and a 5,000 psi sour-service configuration.

Applications include:

• Cementing lines
• Acidizing lines
• Drilling-fluid systems
• Well-service manifolds
• Pump connections

Fig 1002

Fig 1002 provides a standard 10,000 psi rating and a 7,500 psi H₂S-service rating.

Applications include:

• High-pressure cementing
• Well testing
• High-pressure mud lines
• Production testing
• Injection systems
• 4-inch high-rate flowlines

Fig 1502

Fig 1502 provides a standard 15,000 psi rating and a 10,000 psi H₂S-service rating.

Applications include:

• Hydraulic fracturing
• Acid stimulation
• High-pressure cementing
• Choke and kill manifolds
• Flowback systems
• High-pressure well testing
• Pump-discharge manifolds

Connection Orientation

Pup Joints are supplied with the following end combinations:

• Male × Male
• Male × Female
• Female × Female
• Union × Flange
• Flange × Flange
• Union × Studded End
• Combination Fig Connections

The end orientation is specified from the flowline assembly drawing.

Mixed union figures are used as engineered adapters between two pressure systems only when the complete assembly carries the lower working-pressure rating.

Materials

Standard-Service Material

Standard pressure-containing components use high-strength low-alloy steel such as:

• AISI 4130
• AISI 4140
• Equivalent quenched-and-tempered alloy steel

Material properties include:

• High tensile strength
• High yield strength
• Impact toughness
• Fatigue resistance
• Machinability
• Heat-treatment response

Sour-Service Material

H₂S-service Pup Joints use:

• Controlled-hardness alloy steel
• Sour-service heat treatment
• NACE-compatible material selection
• H₂S-resistant seal compounds
• Hardness inspection
• Full material traceability

Sour-service construction is supplied for oilfield fluids containing hydrogen sulfide.

Temperature Range

The standard Class PU operating range is:

−29°C to 121°C / −20°F to 250°F

Additional material packages cover:

• Low-temperature land service
• Arctic service
• High-temperature cementing
• High-temperature production testing
• Sour-gas service
• Chemically aggressive fluid service

The metallic body, union seal, flange gasket and protective coating are supplied as one temperature-compatible package.

Flow Media

Goldenman High-Pressure Pup Joints are used with:

• Drilling mud
• Cement slurry
• Fracturing fluid
• Acidizing fluid
• Completion fluid
• Produced water
• Injection water
• Crude oil
• Natural gas
• Nitrogen
• Flowback fluid
• Sand-laden stimulation fluid
• Sour oil and gas

Seal and material packages are matched to the fluid composition.

Full-Bore Flow Design

The internal bore is machined to provide a smooth flow transition through the straight pipe and end connections.

A controlled full-bore passage provides:

• Reduced flow restriction
• Lower turbulence
• Reduced local erosion
• Improved pumping efficiency
• Easier cleaning and flushing
• Stable high-rate flow
• Reduced pressure loss

Internal shoulders, weld penetration and connection transitions are inspected to prevent flow restriction.

Erosion-Resistant Configuration

Abrasive-service Pup Joints are used with sand-laden fracturing fluids, cement slurry and drilling mud.

The erosion-resistant design includes:

• Heavy-wall alloy-steel body
• Smooth internal transitions
• Controlled weld profile
• Hardened union-end areas
• Corrosion allowance
• Replaceable end seals
• Regular wall-thickness inspection points

High-velocity abrasive flow is controlled through proper bore selection and manifold layout.

Applications

Goldenman High-Pressure Pup Joints are used in:

• Cementing manifolds
• Fracturing manifolds
• Acidizing lines
• Choke manifolds
• Kill manifolds
• Mud manifolds
• Standpipe manifolds
• Pump-discharge lines
• Well-test packages
• Flowback manifolds
• Production-test systems
• Coil-tubing support systems
• Water-injection lines
• Nitrogen-pumping systems
• Wellhead flowlines
• High-pressure temporary piping
• Land drilling operations
• Offshore well-service operations

Installation

Installation includes:

1. Verify the pup-joint size and rated working pressure.
2. Inspect both end connections.
3. Clean the union sealing surfaces.
4. Install the specified pressure seal ring.
5. Align the pup joint without bending or side loading.
6. Engage the wing nut completely.
7. Tighten the connection with the approved hammering procedure.
8. Support long straight sections.
9. Install restraints on temporary high-pressure flowlines.
10. Pressure-test the assembled line.
11. Inspect all connections before pumping.

Flanged connections use the correct ring gasket, studs, nuts and controlled tightening sequence.

Inspection Before Use

Inspection covers:

• Body corrosion
• Wall loss
• External impact damage
• Bore erosion
• Union threads
• Wing-nut lugs
• Male union nose
• Female sealing surface
• Pressure seal ring
• Flange face
• Ring groove
• Welds
• Identification markings
• Rated working pressure
• Service classification

A damaged or unidentified Pup Joint is removed from high-pressure service.

Maintenance

Routine maintenance includes:

• Cleaning union connections
• Replacing damaged seal rings
• Lubricating union threads
• Inspecting wing-nut lugs
• Inspecting sealing noses
• Measuring wall thickness
• Inspecting welded areas
• Checking corrosion protection
• Reapplying thread protection
• Completing periodic hydrostatic tests

Union components are stored with protective caps installed.

Manufacturing Process

Goldenman manufacturing includes:

1. Raw-material inspection
2. Heat-number identification
3. Forging or heavy-wall tube preparation
4. Heat treatment
5. Rough machining
6. Union or flange machining
7. Bore machining
8. Welding under qualified procedures
9. Post-weld heat treatment
10. Dimensional inspection
11. Hardness testing
12. NDE
13. Hydrostatic pressure testing
14. Surface treatment
15. Permanent marking
16. Final documentation review
17. Export packaging

Quality Control and Testing

Quality control includes:

• Chemical-composition verification
• Mechanical-property testing
• Impact testing
• Heat-treatment record review
• Hardness inspection
• Dimensional inspection
• Bore inspection
• Union-thread inspection
• Flange inspection
• Ring-groove inspection
• Wall-thickness measurement
• Ultrasonic testing
• Magnetic-particle testing
• Weld inspection
• Hydrostatic proof testing at 1.5 times rated working pressure
• External leakage inspection
• Permanent marking inspection
• Final visual inspection

Traceability and Marking

Each Pup Joint is permanently marked with:

• Goldenman identification
• Nominal size
• Union figure or flange rating
• Rated working pressure
• Overall length
• Material heat number
• Product serial or batch number
• Standard or sour-service designation
• Test date
• Flow direction where applicable

The markings remain readable after field installation and coating.

Documentation

The product documentation package includes:

• Certificate of Conformity
• Product datasheet
• General assembly drawing
• End-connection drawing
• Material certificate
• EN 10204 3.1 certificate
• Heat-treatment record
• Mechanical-property report
• Impact-test report
• Hardness report
• UT report
• MPI report
• Weld inspection report
• Dimensional inspection report
• Hydrostatic test report
• Material traceability record
• Packing list
• Third-party inspection report

Frequently Asked Questions

Is this page only for a 4-inch Pup Joint?

No.

The product series covers nominal sizes from 1 to 4 inches. The 4-inch Fig 1002 and 4-1/16-inch flanged configurations are included in the range.

What is the difference between a Pup Joint and a High-Pressure Straight Pipe?

Both terms describe a rigid straight flowline section.

“Pup Joint” is commonly used for shorter modular sections, while “High-Pressure Straight Pipe” covers standard and extended straight lengths.

What is the maximum working pressure?

Standard configurations are rated up to 15,000 psi.

The exact rating is defined by the Hammer Union figure, flange pressure class, material and service category.

Which connection is used for 15,000 psi service?

Fig 1502 Hammer Unions and 15,000 psi API flanges are used for 15,000 psi standard-service systems.

Which 4-inch union connection is available?

The 4-inch pressure-seal configuration uses a Fig 1002 Hammer Union with a 10,000 psi working-pressure rating.

Are H₂S-service Pup Joints available?

Yes.

H₂S-service integral Pup Joints are supplied in Fig 602 at 5,000 psi, Fig 1002 at 7,500 psi and Fig 1502 at 10,000 psi.

What is the difference between integral and welded construction?

An Integral Pup Joint has no circumferential weld in the principal pressure body.

A Welded Pup Joint uses qualified welds to connect union or flange end subs to the straight pipe body.

Can different end connections be combined?

Yes.

Available combinations include union-by-union, union-by-flange, flange-by-flange and mixed-figure transition configurations.

Are custom lengths available?

Yes.

Standard lengths are 1, 1.5, 2, 2.5 and 2.8 meters. Custom lengths are manufactured from the approved flowline drawing.

Is Weco a product standard?

No.

Weco is a commercial connection-family reference. The Pup Joint is specified by its nominal size, union figure, pressure rating, seal arrangement, material and length.

Can a Fig 1502 Pup Joint connect directly to a Fig 1002 union?

No.

Different union figures use different pressure ratings, thread forms, sealing geometry and connection dimensions. A purpose-built transition adapter is required.

Is the pressure rating reduced for sour service?

Yes.

Sour-service configurations use controlled-hardness materials and reduced working-pressure ratings for the specified union figure.

Can these Pup Joints carry sand-laden fracturing fluid?

Yes.

Integral high-pressure configurations are used in abrasive fracturing and stimulation service. Wall thickness and bore condition are included in the periodic inspection program.

What data identify a replacement Pup Joint?

Replacement identification uses nominal size, union figure, rated pressure, end orientation, overall length, seal type, material and service category.

Information Required for Quotation

Please provide:

• Nominal size
• Rated working pressure
• Required union figure
• Pressure-seal or non-pressure-seal connection
• Integral or welded construction
• Male or female end orientation
• Union-by-union or union-by-flange arrangement
• Overall length
• Flange size and pressure class
• Working fluid
• Standard or H₂S service
• Minimum operating temperature
• Maximum operating temperature
• Material requirement
• NACE requirement
• Hydrostatic test requirement
• Third-party inspection requirement
• Required quantity
• Existing drawing or part number
• Destination country
• Delivery schedule

Request a Technical Quotation

Goldenman supplies Integral and Welded High-Pressure Pup Joints for cementing, fracturing, drilling, well-testing, flowback and production systems.

The available range covers 1–4-inch flowlines, Fig 206–1502 Hammer Union connections, API flanged ends, standard lengths from 1 to 2.8 meters and working pressures up to 15,000 psi.

Complete products are supplied with pressure seals, end protectors, material traceability, NDE reports and hydrostatic test documentation.

Email: info@goldenman.com

Weco is a trademark of its respective owner. The name is used only to describe connection compatibility and does not indicate OEM manufacture or affiliation.