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Description
Product Overview
GPE manufactures High-Pressure Annular Manifolds, also known as Steel Hose Loops or Cementing and Circulating Hose Loops, for hydraulic fracturing, cementing, acidizing, well testing, circulation and high-pressure Flow Iron systems.
The assembly combines long-radius swivel joints with rigid straight pipe sections to create an articulated pressure-retaining loop. Each swivel section provides rotational positioning, allowing the loop to adapt to equipment spacing, elevation differences and connection orientation without forcing rigid Flow Iron into alignment.
Unlike an elastomeric flexible hose, the GPE Steel Hose Loop is built from forged alloy-steel swivel joints, pressure-rated straight pipe assemblies and Hammer Union connections. The metallic articulated structure provides a controlled high-pressure flow path for temporary well-service lines exposed to pressure pulsation, vibration, repeated rig-up and abrasive treatment fluids.
GPE manufactures two principal structures:
- Long-Radius Annular Manifold
- Articulated Annular Manifold
The standard manufacturing range covers nominal sizes from 1 to 4 in and working pressures from 5,000 to 20,000 psi. Style 50 long-radius swivel joints are the standard configuration, while Style 10 swivel joints and mixed Style 10 × Style 50 assemblies are supplied according to the required loop geometry.
Available straight-pipe structures include:
- Integral union-end straight pipe
- NPST straight pipe
- Retained-nut Pup Joint
- Custom rigid straight pipe
- Male × Female end arrangement
- Male × Male and Female × Female project configurations
- Fig 602, Fig 1002, Fig 1502 and engineered 20K connections
- Standard Service
- Low-Temperature Service
- H₂S and Sour Service
The loop can be folded into a compact transport position, expanded during wellsite rig-up and repositioned after the complete Flow Iron system has been isolated and fully depressurized.
GPE Annular Manifolds integrate with High-Pressure Swivel Joints, Hammer Unions, High-Pressure Plug Valves, High-Pressure Check Valves and Emergency Relief Valves in complete Flowline & Frac Manifold systems.
Need a Hose Loop for an Existing Flow Iron Layout?
Send GPE the nominal size, working pressure, required loop length, swivel style, connection figure, end orientation, service environment and quantity.
Our engineering team will prepare the matching assembly configuration, dimensional drawing and factory quotation.
Request a Hose Loop Quote:
https://gpepump.com/contact/
Send Your Flowline Layout:
info@gpepump.com
Product Short Description
GPE High-Pressure Annular Manifolds provide an articulated steel connection between Frac Pumps, cementing units, manifolds, valves and wellhead equipment.
Long-radius swivel joints reduce abrupt directional changes and support smoother flow through the loop. The straight pipe sections provide the required reach, while the swivel arrangement allows multi-plane positioning during rig-up.
The standard Style 50 configuration is used for compact long-radius loops. Style 10 assemblies provide a longer U-shaped routing arrangement, while mixed Style 10 and Style 50 designs combine different swivel geometries in one loop.
Integral and NPST straight-pipe options allow the assembly to match existing Flow Iron systems, maintenance practices and replacement-part requirements.
Product Highlights
- Alternative names: Steel Hose Loop and Cementing/Circulating Hose Loop
- Nominal sizes from 1 to 4 in
- Working pressures from 5,000 to 20,000 psi
- Metric pressure range from 35 to 140 MPa
- Long-Radius Annular Manifold
- Articulated Annular Manifold
- Style 50 long-radius swivel configuration
- Style 10 long-radius swivel configuration
- Mixed Style 10 × Style 50 configuration
- Integral straight pipe
- NPST straight pipe
- Retained-nut Pup Joint options
- 360-degree positioning at each swivel section
- Multi-plane rig-up capability
- Compact folding for transport and storage
- Forged alloy-steel pressure bodies
- Precision-machined ball-bearing races
- Smooth internal bore transitions
- Reduced local turbulence
- Reduced directional pressure loss
- Improved performance in abrasive service
- High-pressure Hammer Union connections
- Fig 602, Fig 1002 and Fig 1502 options
- Engineered 20K connection options
- Standard Service
- Low-Temperature Service
- H₂S and Sour Service
- PU and PL temperature classes
- Replaceable seals and bearing components
- Hydrostatic pressure testing
- Rotational-function inspection
- Complete redress-kit supply
- Custom centerline and overall dimensions
- Replacement-compatible manufacturing
Main Technical Specifications
| Parameter | GPE Manufacturing Range |
|---|---|
| Product | High-Pressure Annular Manifold |
| Alternative names | Steel Hose Loop / Cementing and Circulating Hose Loop |
| Product category | High-Pressure Flow Iron |
| Nominal sizes | 1, 1-1/2, 2, 3 and 4 in |
| Working pressure | 5,000–20,000 psi |
| Metric pressure range | 35–140 MPa |
| Pressure series | 5K, 6K, 10K, 15K and 20K |
| Standard temperature range | -29°C to 121°C |
| Low-temperature range | -46°C to 121°C |
| Temperature classes | PU and PL |
| Main structures | Long-Radius and Articulated Annular Manifold |
| Swivel styles | Style 10, Style 50 and mixed Style 10 × 50 |
| Straight-pipe structures | Integral, NPST, retained-nut or custom Pup Joint |
| Body construction | Forged and heat-treated alloy steel |
| Swivel mechanism | Precision ball-bearing race system |
| Rotation | 360° positioning at each swivel section |
| End connections | High-pressure Hammer Union and approved project connections |
| End arrangements | M × F, M × M and F × F |
| Service environment | Standard, Low Temperature or H₂S Service |
| Main applications | Fracturing, cementing, acidizing, testing and circulation |
| H₂S material selection | NACE MR0175 / ISO 15156 |
| Inspection | UT, MPI, hardness, dimensional and functional inspection |
| Pressure testing | Hydrostatic body, seal-integrity and pressure-hold testing |
| Supply scope | Complete loop, seal kits, bearing kits and redress components |
Confirm the Correct Swivel Style and Loop Dimensions
The nominal size and pressure class do not define the complete Annular Manifold.
The final configuration depends on the required overall length, loop width, equipment centerline spacing, elevation difference, swivel style, straight-pipe structure, end orientation, connection figure, internal bore, working pressure, service fluid and proppant concentration.
Send GPE the existing Flow Iron drawing, centerline dimensions or photographs with measurements. We will confirm the correct loop structure before production.
Confirm the Correct Hose Loop Configuration:
https://gpepump.com/contact/
Send Swivel and Dimensional Requirements:
info@gpepump.com
Standard Pressure and Connection Positioning
| Working Pressure | Metric Class | Typical Connection Family | Service Positioning |
| 5,000 psi | 35 MPa | Flanged, threaded or approved project connection | Medium-pressure circulation and service lines |
| 6,000 psi | 42 MPa | Fig 602 | Cementing, circulation and well service |
| 10,000 psi | 70 MPa | Fig 1002 | Cementing, acidizing and well testing |
| 15,000 psi | 105 MPa | Fig 1502 | Hydraulic fracturing and high-pressure Flow Iron |
| 20,000 psi | 140 MPa | Fig 2002 or engineered interface | Ultra-high-pressure pumping and testing |
The complete assembly rating is controlled by the lowest-rated swivel joint, straight pipe, connection, seal package and service configuration.
Long-Radius Annular Manifold
The Long-Radius Annular Manifold combines long-radius swivel joints with two parallel rigid straight pipe sections.
The loop provides:
- Compact U-shaped routing
- Multi-plane positioning
- Defined Flow Iron offset
- Reduced bend severity
- Lower local pressure loss
- Reduced proppant impact at the elbows
- Easier transport and storage
- Repeatable wellsite rig-up
The large bend radius produces a more gradual change in flow direction than a compact short-radius elbow.
Configuration 1: Style 50 Long-Radius Swivels with Integral Straight Pipe
This configuration uses Style 50 long-radius swivel joints, integral union-end rigid straight pipe and standard male and female Flow Iron ends.
It provides a compact loop with robust integral pipe ends and direct compatibility with common high-pressure treatment iron.
Primary applications include Frac Pump discharge routing, cementing-unit connections, pump-to-manifold loops, well-test flowlines and high-pressure circulation systems.
Configuration 2: Style 10 Long-Radius Swivels with Integral Straight Pipe
This configuration uses Style 10 long-radius swivel joints and integral union-end rigid straight pipe.
Style 10 geometry is selected when the installation requires a different offset, centerline relationship or turning arrangement than the compact Style 50 loop.
Configuration 3: Style 50 Long-Radius Swivels with NPST Straight Pipe
This configuration combines Style 50 long-radius swivels with NPST straight-pipe assemblies.
The NPST attachment system allows the pressure pipe and union-end components to be manufactured and maintained as a defined assembly.
Advantages include replaceable or serviceable end components, compatibility with established Flow Iron inventories, standardized straight-pipe lengths and controlled union-end orientation.
Mixed Style 10 × Style 50 Hose Loop
A mixed Style 10 × Style 50 assembly combines two swivel geometries to achieve the required loop shape.
The mixed configuration is used for different offsets at each end, restricted equipment clearance, non-symmetrical connection positions and replacement of existing assemblies.
Articulated Annular Manifold
The Articulated Annular Manifold uses a simplified articulated loop with fewer field connection points than a conventional multi-union assembly.
The structure provides:
- Reduced connection count
- Reduced potential leakage points
- Lower assembly weight
- Easier rotation and positioning
- Faster rig-up
- Compact storage
- Improved operational handling
Steel Hose Loop vs Flexible Hose
| Steel Hose Loop | Flexible High-Pressure Hose |
| Forged swivel joints and rigid steel pipe | Reinforced flexible hose body |
| Rotation occurs at defined swivel sections | Flexibility distributed along the hose |
| High resistance to external impact | Easier routing around complex obstacles |
| Replaceable swivel seals and bearings | Hose body replaced according to inspection criteria |
| Requires controlled alignment and support | Requires bend-radius and end-fitting control |
| Common in cementing and Flow Iron loops | Common in modern flexible frac flowlines |
The GPE Annular Manifold is a steel articulated Flow Iron assembly. It is not an elastomeric hose.
Swivel Joint Operating Principle
Each swivel section contains a male swivel sub and female swivel body connected by precision-machined ball-bearing races.
The bearing system maintains axial engagement, transfers mechanical load and allows rotational positioning between pressure-containing components.
The pressure-supported sealing assembly retains process fluid. The environmental seal protects the bearing chamber from external sand, cement, water and contamination.
Intentional repositioning, lubrication, inspection and disassembly are completed only after the full Flow Iron system has been isolated and depressurized.
Long-Radius Flow Performance
Long-radius elbows create a gradual change in flow direction.
This provides reduced abrupt turbulence, lower local pressure drop, reduced direct solids impact, more even erosion distribution and improved cement-slurry and proppant transport.
The outer radius of each elbow remains a primary UT wall-thickness inspection location.
Integral and NPST Straight Pipe
Integral straight-pipe sections use permanently integrated high-pressure union ends, reducing loose-component count and maintaining stable bore alignment.
NPST straight-pipe assemblies use a non-pressure-seal attachment thread to connect the pipe and union-end component. The pressure boundary is maintained by the approved shoulder, seal and union geometry rather than by the attachment thread alone.
The complete straight-pipe assembly is manufactured, inspected and pressure-tested as one pressure system.
Hammer Union Connections
Hammer Union ends provide rapid makeup and breakout during temporary Flow Iron installation.
The connection is verified by figure number, nominal size, male or female orientation, working-pressure class, seal profile, service class and dimensional compatibility.
Different figure numbers and service classes are not mixed based on visual appearance or color alone.
See GPE Hammer Unions for available connection families and repair parts.
Standard, Low-Temperature and H₂S Service
Standard-Service loops handle compatible non-sour fracturing fluid, cement slurry, drilling fluid, completion brine, water, well-test fluid and flowback fluid.
PL-class configurations use qualified pressure materials, low-temperature seals and impact-tested components for service down to -46°C.
H₂S Service loops use controlled-hardness materials, qualified heat treatment, sour-service seals, full heat-number traceability and NACE MR0175 / ISO 15156 material selection.
Applications
Hydraulic Fracturing
The Hose Loop connects Frac Pumps, discharge manifolds, Plug Valves, Check Valves, rigid treatment lines, Frac Missiles, Zipper Manifolds and Frac Trees.
Cementing
The loop connects cementing units, high-pressure cement pumps, cementing manifolds, cement heads, circulating heads and wellhead equipment.
Acidizing
Acidizing configurations use materials and seals selected for the acid type, concentration, corrosion inhibitor, temperature, H₂S, CO₂ and chloride content.
Well Testing and Circulation
Steel Hose Loops provide articulated routing between test pumps, manifolds, wellhead equipment and temporary pressure-control systems.
Transportation, Storage and Restraint
The loop can be folded into a compact position for transportation and storage after it is depressurized, drained, cleaned and protected.
Transport preparation includes thread protection, seal protection, swivel positioning, transport restraints and lifting-point verification.
Temporary high-pressure Flow Iron requires an approved restraint system. Restraints supplement correct connection makeup, support, inspection and pressure testing.
Manufacturing Process
- Approved drawing and configuration review
- Pressure-boundary design verification
- Alloy-steel forging material verification
- Heat-number assignment
- Forging ultrasonic inspection
- Rough machining
- Controlled quenching and tempering
- Mechanical-property and hardness testing
- Flow-bore and long-radius elbow machining
- Ball-bearing race and seal-groove machining
- Integral or NPST straight-pipe manufacturing
- Hammer Union end machining
- Critical-area magnetic-particle inspection
- Dimensional and wall-thickness inspection
- Seal and bearing assembly
- Complete loop assembly
- Rotational-function inspection
- Hydrostatic pressure testing
- Seal-integrity and pressure-hold testing
- Permanent marking and documentation review
Quality Control and Testing
GPE quality control includes material-certificate verification, heat-number traceability, mechanical-property testing, hardness testing, low-temperature impact testing where required, forging UT, critical-area MPI, bore and wall-thickness inspection, bearing-race inspection, seal-groove inspection, connection inspection and overall loop-dimensional inspection.
Every complete Annular Manifold receives:
- Hydrostatic pressure-body test
- Union and end-connection leakage inspection
- Swivel-seal integrity test
- Pressure-hold test
- Rotational-function inspection after depressurization
- Overall dimensional inspection
- Permanent-marking verification
Product Documentation
The supply documentation includes:
- Certificate of Conformity
- Product datasheet
- General arrangement drawing
- Dimensional drawing
- Connection schedule
- Material Test Certificates
- Heat-treatment and mechanical-property reports
- Hardness and impact-test reports where specified
- UT and MPI reports
- Wall-thickness report
- Hydrostatic pressure-test report
- Seal-integrity-test report
- Serial-number traceability list
- Installation and maintenance instructions
- Spare-parts list
- Packing list
Installation and Maintenance
Before installation, verify the size, pressure class, swivel style, connection figure, male and female orientation, sealing surfaces and service class.
Position the loop without forcing the swivel joints, support the rigid pipe sections, install approved Flow Iron restraints and pressure-test the completed line.
Routine maintenance includes cleaning after service, inspecting union ends, checking primary and environmental seals, verifying smooth rotation after depressurization, measuring bearing clearance, monitoring elbow and pipe wall thickness and replacing worn seals and bearings.
Redress Kits and Spare Parts
GPE supplies:
- Primary pressure seals
- Anti-extrusion support rings
- Environmental seals
- Bearing balls and race components
- Grease fittings
- Retaining components
- Hammer Union seal rings
- Integral straight-pipe assemblies
- NPST straight-pipe assemblies
- Complete swivel-joint redress kits
- Complete loop spare-parts packages
Common Failure Modes
Leakage at a Swivel Section
Main causes include worn pressure seals, damaged anti-extrusion rings, scratched sealing surfaces, excessive bearing clearance, abrasive contamination and incorrect assembly.
Leakage at a Hammer Union
Main causes include an incorrect seal, damaged union geometry, insufficient makeup, mismatched figure components, erosion and external piping load.
Difficult Rotation
Main causes include inadequate lubrication, corroded bearings, packed cement or sand, bearing-race damage, excessive piping load and forced alignment.
Rapid Elbow Erosion
Main causes include high proppant concentration, excessive velocity, extended pumping time, bore mismatch and repeated operation with the same impact orientation.
Straight-Pipe Bending
Main causes include unsupported equipment weight, transport impact, forced rig-up, lifting from an unapproved point and excessive external load.
Every affected loop is isolated, depressurized, inspected and pressure-tested before reuse.
How to Select the Correct Annular Manifold
- Confirm the nominal size.
- Confirm the rated working pressure.
- Select Long-Radius or Articulated construction.
- Select Style 10, Style 50 or mixed swivel geometry.
- Select Integral or NPST straight pipe.
- Define the connection figure.
- Define male and female end orientation.
- Provide the required overall length and width.
- Provide equipment centerline dimensions.
- Define Standard, Low-Temperature or H₂S Service.
- State the operating-temperature range.
- State the service fluid and solids loading.
- Confirm transport and storage requirements.
- Confirm inspection and documentation requirements.
- Confirm seal, bearing and redress-kit quantities.
Frequently Asked Questions
What is an Annular Manifold?
An Annular Manifold is an articulated high-pressure loop assembled from swivel joints and rigid straight pipe sections. It is also called a Steel Hose Loop or Cementing and Circulating Hose Loop.
Is it a flexible rubber hose?
No. It is a metallic articulated Flow Iron assembly. Movement occurs at the swivel joints rather than through a flexible hose body.
What sizes does GPE manufacture?
GPE manufactures 1, 1-1/2, 2, 3 and 4 in Annular Manifolds.
What pressure classes are available?
The manufacturing range covers 5,000 to 20,000 psi / 35 to 140 MPa.
Which swivel styles are available?
GPE manufactures Style 10, Style 50 and mixed Style 10 × Style 50 configurations.
What is the standard configuration?
Style 50 long-radius swivel joints with integral straight pipe are the standard compact configuration.
What is the difference between Integral and NPST straight pipe?
Integral straight pipe uses permanently integrated union ends. NPST construction uses a defined attachment thread and separate pressure-sealing geometry.
What is the advantage of long-radius elbows?
Long-radius elbows reduce abrupt flow-direction changes, pressure loss and localized erosion in high-rate abrasive service.
Can the loop rotate under pressure?
It is not intentionally repositioned, adjusted, serviced or disassembled while pressurized. Repositioning is completed after the system is isolated and fully depressurized.
Which connection is used for 15K fracturing?
Fig 1502 is widely used for 15,000 psi fracturing and high-pressure Flow Iron.
Are 20K loops available?
Yes. GPE manufactures engineered 20,000 psi configurations using approved swivel joints, straight pipe and connection interfaces.
Are H₂S and low-temperature configurations available?
Yes. Sour-service products use NACE MR0175 / ISO 15156 material selection, while PL-class configurations are available for service down to -46°C.
Can the loop be folded for transport?
Yes. The articulated design can be positioned into a compact transport and storage arrangement after it is drained and depressurized.
Can GPE match an existing Hose Loop?
Yes. GPE manufactures replacement-compatible assemblies from existing part numbers, drawings, dimensions and physical samples.
Are repair kits available?
Yes. GPE supplies pressure seals, environmental seals, bearing components, Hammer Union seals and complete redress kits.
What tests are completed before shipment?
Each complete loop receives material and dimensional inspection, NDE, rotational-function inspection, hydrostatic pressure testing and seal-integrity testing.
Request a High-Pressure Hose Loop Proposal
GPE manufactures complete High-Pressure Annular Manifolds and Steel Hose Loops for fracturing, cementing, acidizing, well testing and circulation systems.
Our manufacturing range includes:
- 1–4 in nominal sizes
- 5,000–20,000 psi working pressures
- Long-Radius and Articulated structures
- Style 10 and Style 50 swivel joints
- Mixed Style 10 × Style 50 configurations
- Integral and NPST straight pipe
- Fig 602, Fig 1002 and Fig 1502 ends
- Engineered 20K connections
- Standard, Low-Temperature and H₂S Service
- Custom overall and centerline dimensions
- Replacement-compatible assemblies
- Complete material, NDE and pressure-test documentation
- Seal, bearing and redress kits
GPE also supplies matching Swivel Joints, Hammer Unions, Plug Valves, Check Valves and Emergency Relief Valves.
Request a Technical Quote:
https://gpepump.com/contact/
Email:
info@gpepump.com
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