High-pressure pneumatic pipeline plugs seal corroded pipes by using deformable elastomer seals, pressure-activated cup designs, and multi-element redundancy to conform to irregular surfaces and prevent leakage. Advanced designs also use segmented expansion and temporary fillers to compensate for corrosion pits and wall loss. What Is a Pipeline Plug? A pipeline plug is a temporary isolation
Pipeline Plug Isolation in One Minute Field data shows that over 70% of pipeline isolation failures are linked to improper material selection or installation—not pressure overload. What Is a Pipeline Plug? A pipeline plug is a temporary internal isolation device inserted into a pressurized pipeline to stop flow and create a safe working section without
Through-wall defects in gas pipelines create an immediate loss of pressure containment and require urgent repair. Engineered composite systems offer a proven solution for restoring up to 100% MAOP without shutdown—when designed to address cyclic fatigue and gas permeation. This guide explains ASME B31.8 and ISO 24817 pressure limits, compares carbon fiber versus glass fiber
Underwater composite repair for corrosion isolate offshore risers is a subsea rehabilitation method where carbon fiber wraps bonded with marine-grade epoxy restore mechanical strength and create a permanent corrosion barrier on damaged risers without shutdown or welding. When validated under severe wave action combined with cyclic pressure, carbon fiber systems demonstrate fatigue resistance exceeding 10,000,000
How Carbon Fiber Composite Wraps Extend Pipeline Fatigue Life (ASME B31.8 Guide) Carbon fiber composite wraps extend pipeline fatigue life by reducing crack tip stress intensity (ΔK) through load sharing, enabling up to 10 million pressure cycles and over 20 years of service under ASME B31.8. What is pipeline fatigue cracking?Pipeline fatigue cracking is the
ISO 24817 and ASME PCC-2 Part 4 are standards for composite wrap repair of pressurized pipelines. ISO 24817 uses a performance-based design that allows thinner, optimized repairs based on material testing, while ASME PCC-2 applies stricter safety factors, resulting in thicker and more conservative designs. In practice, ISO is typically used for moderate wall loss
Овальность трубопровода является решающим фактором при определении возможности безопасного выполнения операций по остановке линии в соответствии со стандартом API 570. На практике овальность, превышающая 3%, снижает эффективность уплотнения складной заглушки, а овальность, превышающая 5%, как правило, является недопустимой. В данном руководстве объясняются допустимые пределы, методы контроля, механизмы отказов, а также то, как принять решение о продолжении работ, компенсации или отказе от остановки трубопровода.
Пределы овальности трубопровода при остановке линии (Руководство API 570) Читать далее »
Piggyback line stopping requires diverting 85–95% of total flow through a bypass to keep annular velocity below 2.5 m/s. The required bypass flow is calculated using Q_bypass = Q_total − (V_allow × A_gap). If bypass is undersized, annular velocity can exceed 4–10 m/s, causing severe vibration and rapid stopping bar failure. Quick Calculation Box Bypass
Best Elastomer for 150°C+ DBB Line Stopping For double block and bleed line stopping in high-temperature crude pipelines, the elastomer selection follows this rule: Elastomer Selection by Temperature Pipeline Condition Recommended Elastomer 150–170°C, low aromatics (<15%) FKM (minimum acceptable) 150–200°C, sour or high-aromatic crude FFKM required 170–200°C (any crude) FFKM recommended 200–260°C (any crude) Only
The minimum required wall thickness for in-service subsea hot tapping is defined by DNV-RP-F113 as the larger value between burst thickness (governed by internal pressure) and collapse thickness (governed by external hydrostatic pressure), after subtracting corrosion allowance. In deepwater conditions exceeding 700 meters, collapse pressure resistance typically governs the calculation. This guide provides step-by-step calculation
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