Components for Pipeline Construction and Integrity
Essential Components for Pipeline Construction, Integrity, and Maintenance
Beyond the pipe itself, a complete pipeline system requires a range of accessories for corrosion protection at field joints, pipe handling and storage, cathodic protection, and operational pigging. [Company Name] supplies these critical accessories with full traceability and project-specific certification.
- Category Items
- Field Joint Coatings Heat shrink sleeves (HSS), liquid epoxy kits, field-applied FBE, visco-elastic wrap, petrolatum tape
- Pipe Protection Pipe end protectors (plastic and steel), thread protectors, pipe caps, bevel protectors
- Sacrificial Anodes Magnesium anodes (soil), zinc anodes (seawater), aluminum anodes (offshore)
- Pipeline Test Equipment Test caps, weld test caps, hydrostatic test fittings
- Pipe Marking & Traceability Heat number transfer, pipe tally sheets, coating trace-back records
- Pipeline Pigs (Utility) Foam pigs, mandrel pigs, batching pigs, gauging plates
- Field Joint Coatings
Field-applied corrosion protection systems for girth welds, tie-ins, and repairs. The field joint is often the weakest link in a pipeline’s corrosion defense—proper material selection and application quality are critical.
1.1 Heat-Shrinkable Sleeves (HSS)
The industry-standard field joint coating for 3LPE, 3LPP, and FBE-coated pipelines. Crosslinked polyethylene backing with a heat-activated adhesive.
Applicable Standards: ISO 21809-3, NACE SP0303, DIN 30672
Sleeve Types:
Type Backing Adhesive Max Service Temp Application
Standard PE Sleeve Crosslinked HDPE Hot-melt adhesive 80°C Buried onshore 3LPE pipelines
High-Temp PP Sleeve Crosslinked PP High-temperature adhesive 110°C High-temp and 3LPP offshore
Two-Layer Sleeve PE + Butyl Mastic/Butyl 50°C Low-temp, repairs, fittings
Insulation Sleeve PE + Syntactic foam Hot-melt 80°C Subsea insulation continuity
Kit Contents (Typical):
· Heat-shrinkable sleeve (main wrap)
· Epoxy primer (two-component, field-mixed)
· Closure patch / sealing strip
· Application instructions and batch certificates
Key Selection Parameters:
· Pipe OD and coating type (3LPE, 3LPP, FBE)
· Operating temperature (continuous and peak)
· Factory coating cutback dimensions (per project WPS)
· Soil stress and burial depth
Quality Requirements:
· Peel adhesion ≥ 50 N/cm to steel (24 hours after application)
· Peel adhesion ≥ 50 N/cm to factory PE coating
· No wrinkles, bubbles, or voids
· Smooth adhesive squeeze-out at both edges
1.2 Liquid Epoxy Field Joint Coating
Solvent-free or 100% solids two-component epoxy applied by brush, trowel, or spray to field joints.
Applicable Standards: ISO 21809-3, NACE SP0303
Key Properties:
· Dry Film Thickness: 400 – 800 µm per coat
· Temperature Range: -30°C to +90°C (standard), up to 120°C (high-temp grades)
· Cure Time: 2 – 8 hours (temperature-dependent)
· Surface Preparation: Sa 2½, anchor profile 50-75 µm
Advantages:
· Seamless, monolithic bond to factory FBE or 3LPE coating
· No overlap adhesion concerns (direct bond to PE surface)
· Excellent for complex geometries (bends, tees, flanges, fittings)
· Resistant to cathodic disbondment
Limitations:
· Weather-dependent cure (humidity, dew point, temperature)
· Requires accurate mixing ratio and pot life management
· Longer application time vs. sleeve wrapping
Typical Packaging:
· Pre-measured kits (A+B components) per joint
· Bulk containers for larger repair areas
· Brush-grade and spray-grade formulations
1.3 Visco-Elastic Wrap Systems
Cold-applied, self-amalgamating wrap system. No heat required, no primer required in most cases.
Applicable Standards: ISO 21809-3, EN 12068
Key Properties:
· Application Temperature: -20°C to +50°C
· Maximum Service Temperature: 60°C (standard), 80°C (high-temp)
· Shelf Life: Unlimited (no curing, no pot life)
· Water Absorption: < 0.05% (excellent immersion resistance)
Advantages:
· No torch, no epoxy mixing, no pot life constraints
· Excellent wetting and self-healing properties
· Can be applied to damp surfaces (within limits)
· Simple removal and re-application for weld inspection
Typical Applications:
· Field joints in remote locations (no power or heating)
· Wet or humid environments
· Pipeline repairs and coating rehabilitation
· Transition zones (coated to uncoated pipe)
1.4 Petrolatum / Wax Tape Systems
Petrolatum-impregnated fabric tape. The original cold-applied field joint system.
Key Properties:
· Temperature Range: -30°C to +60°C
· Thickness: 1 – 3mm per wrap layer
· Application: Hand-wrapped, no special tools
Typical Applications:
· Temporary field joint protection
· Flange and valve body protection (above-ground)
· Buried fitting protection
· Secondary wrap over heat-shrink sleeves in rocky terrain
1.5 Field-Applied FBE (Fusion Bonded Epoxy)
Portable FBE application equipment for joints on FBE-coated pipelines.
Key Properties:
· Thickness: 350 – 500 µm
· Application: Induction heating + electrostatic spray or fluidized bed
· Cure: Rapid (seconds to minutes)
Typical Applications:
· Directional drill pullback sections (uniform OD required)
· FBE-coated pipeline tie-ins
· Project specifications requiring 100% uniform coating
- Pipe Protection
Handling, transportation, and storage accessories protect pipe ends, bevels, threads, and coatings from mechanical damage during the supply chain journey.
2.1 Pipe End Protectors
Plastic End Protectors (Polyethylene / Polypropylene)
· Push-fit or strap-on designs
· Protection for plain ends, beveled ends, and threaded ends
· UV-stabilized for outdoor storage
· Color-coded by size for quick identification
· Temperature range: -40°C to +80°C
Steel End Protectors
· Threaded steel caps for premium connection threads (casing/tubing and line pipe)
· Meets API 5CT Thread Protector requirements
· Internal thread profile matches pipe thread for secure fit
· Composite protectors also available (steel frame with PE liner)
Bevel Protectors
· Oversized plastic caps protecting the full bevel face
· Prevents bevel face damage during handling and transport
· Typically in high-visibility colors
2.2 Pipe Caps and Plugs
· Pipe Caps: Push-fit plastic caps for OD protection (rain, debris, vermin ingress)
· Pipe Plugs: Internal plugs for ID protection
· Flange Protectors: Plastic covers for flange faces (raised face protection)
· Vent Plugs: Allow air circulation while preventing debris ingress (storage in humid environments)
2.3 Pipe Spacers and Dunnage
· Timber Dunnage: Hardwood timber blocks for pipe stacking (treated per ISPM 15 for export)
· Rubber / Polyurethane Spacers: Reusable spacers between stacked pipe layers
· Pipe Cradles: Shaped supports for individual pipes during transport
· Nylon Sling Protectors: Edge guards for lifting slings to prevent coating damage
2.4 Thread Protectors for Line Pipe
For line pipe supplied with threaded ends (T&C or premium):
· API Standard Thread Protectors: Steel or composite, per API 5CT / 5L
· Premium Thread Protectors: Matched to specific premium connection geometry (VAM, TenarisHydril, Hunting)
· Pin Protectors: Protect external threads (male end)
· Box Protectors: Protect internal threads (female/coupling end)
- Cathodic Protection (CP) Accessories
Sacrificial anodes and CP system components protect buried and submerged pipelines from external corrosion. Used in conjunction with external coatings.
3.1 Sacrificial Anodes
Galvanic anodes corrode preferentially to protect the steel pipeline. Selection depends on soil resistivity (onshore) or water salinity (offshore).
Magnesium Anodes (Onshore / Soil)
Parameter Detail
Alloy High-potential Mg alloy (ASTM B843 AZ63B or M1C)
Application Buried pipelines in soil resistivity > 2,000 ohm-cm
Typical Shapes Packaged anode (Mg ingot cast around steel core, backfilled with gypsum/bentonite/clay in cloth bag)
Weight Range 7.7 kg (17 lb) to 32 kg (70 lb)
Connection Insulated copper cable with thermite weld or pin brazing to pipe
Standards ASTM B843, NACE SP0169
Zinc Anodes (Seawater / Marine)
Parameter Detail
Alloy ASTM B418 Type I or Type II (Special High Grade Zinc)
Application Subsea pipelines, offshore structures, river crossings
Typical Shapes Bracelet (split ring clamp-on), stand-off, sled anodes
Weight Range 10 kg to 500+ kg
Standards ASTM B418, DNV-RP-B401
Aluminum Anodes (Offshore / Seawater)
Parameter Detail
Alloy Al-Zn-In (ASTM B418 Type III)
Application Offshore pipelines, subsea templates (superior capacity-to-weight ratio vs. zinc)
Capacity ≥ 2,500 A·h/kg (high efficiency)
Typical Shapes Bracelet, stand-off, hull anodes
Standards ASTM B418, DNV-RP-B401
Anode Selection Guide:
Environment Recommended Anode Reason
High-resistivity soil (>5,000 ohm-cm) Magnesium Higher driving voltage
Low-resistivity soil (<3,000 ohm-cm) Zinc or Magnesium Zinc for permanent; Mg for temporary Seawater immersion Aluminum or Zinc Aluminum preferred for weight savings Brackish water (estuaries) Zinc or Aluminum Dependent on salinity Hot buried pipelines (>60°C) Zinc Mg passivation at elevated temperature
3.2 CP Test Stations & Monitoring
· Test Station Posts: Above-ground terminals for pipe-to-soil potential measurement
· Cable Connection Kits: Thermite weld kits, pin brazing kits, cable-to-pipe connections
· Permanent Reference Electrodes: Cu/CuSO4 or Ag/AgCl electrodes for permanent monitoring installations
· Junction Boxes: Buried junction boxes for CP cable routing
3.3 Electrical Isolation Components
· Monolithic Insulation Joints / Flanges: Electrically isolate pipeline sections
· Isolation Gaskets & Sleeves: For bolted flange isolation
· Surge Protection: Lightning arrestors and AC mitigation for pipelines near power lines
- Pipeline Test Equipment
Accessories for hydrostatic testing and commissioning of pipeline sections.
4.1 Test Caps and Test Heads
· Weld Test Caps: Welded caps for pipe ends during hydrotest. Available in standard pipe grades and sizes.
· Threaded Test Caps: Threaded caps for smaller-bore test sections.
· Reusable Test Heads: Mechanical clamp-style test heads for repeated use.
· Vent and Drain Fittings: Small-bore welded outlets for filling, venting, and draining test sections.
4.2 Hydrotest Accessories
· Test Plugs: Inflatable or mechanical pipe plugs for isolating test sections
· Pressure Gauges: Calibrated gauges for hydrotest pressure monitoring
· Chart Recorders: Dead-weight testers and chart recorders for 24-hour pressure hold verification
· Chemical Additives: Oxygen scavengers, corrosion inhibitors, biocides for test water treatment
- Pipeline Pigs (Utility)
Pigs (Pipeline Inspection Gauges) for cleaning, batching, and dewatering during construction, commissioning, and operations.
5.1 Cleaning Pigs (Construction Phase)
Foam Pigs
· Open-cell or closed-cell polyurethane foam
· Lightweight, compressible (passes bends, tees, reduced-bore valves)
· Used for initial cleaning, debris removal, drying, and swabbing
· Replacement frequency: High (disposable)
· Available with wire brush or abrasive coating for light rust removal
Mandrel Pigs
· Steel or composite central body with urethane guide discs and cleaning brushes
· Configured with wire brush, urethane scraper, or combination
· Longer service life than foam pigs (requalify and replace polyurethane parts)
· Can accept gauging plates or magnets
5.2 Batching & Separation Pigs
· Used to separate different products in multi-product pipelines
· Full-bore sealing with polyurethane cups or discs
· Bypass ports optional for controlled flow behind pig
5.3 Gauging Pigs
· Aluminum or steel gauge plate mounted to pig body
· Detects internal diameter restrictions, dents, ovality
· Used during construction to prove minimum pipe ID before hydrotest
· Gauge plate diameter: Typically 95% of minimum pipe ID
5.4 Dewatering & Drying Pigs
· Foam pigs with high-density polyurethane shell
· Multiple pig train for progressive drying after hydrotest
· Used with compressed air or nitrogen push
5.5 Brushes & Blades
· Wire Brushes: Carbon steel or stainless steel wire for rust and scale removal
· Urethane Discs / Cups: Sealing and scraping elements
· Gauge Plates: Aluminum GA (Gauge) plates for ID verification
- Pipe Marking, Traceability & Documentation Accessories
Materials and tools for maintaining pipe traceability in the field during cutting, welding, and installation.
6.1 Marking Tools
· Low-Stress Stamping Dies: Dot-matrix dies for marking heat numbers (low stress, no sharp indentations)
· Paint Markers & Low-Chloride Crayons: For temporary marking during fabrication
· Metal Tags & Strapping: Durable ID tags secured with stainless steel wire or bands
6.2 Documentation
· Pipe Tally Sheets: Field log for recording pipe numbers, heat numbers, cut lengths, and installation locations
· Weld Mapping Sheets: Link each girth weld to pipe heat numbers on either side
· Coating Trace-Back Records: Link field joint coating batch numbers to installation location
· As-Built Traceability Dossiers: Compiled for project handover documentation
- Line Pipe Accessories — Supply Summary Table
Category Key Items Typical Standards
Field Joint Coatings Heat-shrink sleeves, liquid epoxy, visco-elastic wrap, petrolatum tape, field FBE ISO 21809-3, NACE SP0303
Pipe End Protection Plastic & steel end protectors, bevel protectors, pipe caps, flange covers Client specifications
Cathodic Protection Mg, Zn, Al anodes, thermite weld kits, test stations, isolation joints ASTM B843, B418, DNV-RP-B401, NACE SP0169
Hydrotest Equipment Weld caps, test heads, pressure gauges, chart recorders, test plugs ASME B31.3/B31.4/B31.8
Pipeline Pigs Foam pigs, mandrel pigs, batching pigs, gauging pigs, brushes/discs Client specifications
Marking & Traceability Marking dies, metal tags, tally sheets, weld mapping, traceability dossiers Project documentation requirements
Line Pipe Accessories — Supply Summary Table
Category Key Items Typical Standards
Field Joint Coatings Heat-shrink sleeves, liquid epoxy, visco-elastic wrap, petrolatum tape, field FBE ISO 21809-3, NACE SP0303
Pipe End Protection Plastic & steel end protectors, bevel protectors, pipe caps, flange covers Client specifications
Cathodic Protection Mg, Zn, Al anodes, thermite weld kits, test stations, isolation joints ASTM B843, B418, DNV-RP-B401, NACE SP0169
Hydrotest Equipment Weld caps, test heads, pressure gauges, chart recorders, test plugs ASME B31.3/B31.4/B31.8
Pipeline Pigs Foam pigs, mandrel pigs, batching pigs, gauging pigs, brushes/discs Client specifications
Marking & Traceability Marking dies, metal tags, tally sheets, weld mapping, traceability dossiers Project documentation requirements