大林 CCPP 專案中 3D/5D 冷作彎管去銲接化與模組化決策深度分析研究 (In-depth Analysis of De-welding and Modularization Decisions for 3D/5D Cold Bending Pipes in the Dalin CCPP Project)

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實作 興達與台中CCPP電廠小尺寸冷作彎管心得報告

Implementation Summary Report on Cold Bending of Small-Bore Piping for Hsinta and Taichung CCPP Projects

 

一、 緒論與大林複循環發電廠之運轉環境範式轉移 / I. Introduction and the Paradigm Shift of the Operating Environment at Dalin Combined Cycle Power Plant

在全球能源轉型與淨零碳排的路徑規劃下，發電系統的調度模式與基礎設施正經歷深刻的範式轉移。隨著高比例的間歇性再生能源（如太陽能與風能）大量併網，傳統基載發電廠的角色逐漸受到挑戰。根據國家發展委員會之淨零路徑規劃，台灣至二零二七年時，太陽光電裝置容量預計將達 24GW，此龐大的併網量將導致電力系統負載極端不穩定1。

Under the global energy transition and net-zero carbon emission roadmaps, the dispatch modes and infrastructure of power generation systems are undergoing a profound paradigm shift. With the large-scale grid integration of a high proportion of intermittent renewable energy (such as solar and wind power), the role of traditional base-load power plants is increasingly being challenged. According to the National Development Council’s net-zero pathway, Taiwan’s solar photovoltaic installation capacity is expected to reach 24GW by 2027, causing extreme instability in power system loads 1.

為因應南部產業的快速成長與轉型，滿足達 2.6% 的用電成長率需求，台灣電力公司規劃於高雄大林發電廠內，利用既有三號與四號燃煤機組拆除後之空間，新建總裝置容量 140 萬瓩以下的兩部燃氣複循環（Combined Cycle Power Plant, CCPP）機組2。此專案之核心戰略在於採用單機容量較小（約 55 萬至 70 萬瓩）且具備快速起停（Two-shifting）能力之機組，藉此極大化電網的調度彈性並確保系統穩定。To accommodate the rapid industrial growth and transformation in southern Taiwan, and to meet an electricity demand growth rate of 2.6%, Taiwan Power Company plans to utilize the space freed up by the dismantling of the existing No. 3 and No. 4 coal-fired units at the Dalin Power Plant in Kaohsiung to construct two new gas-fired Combined Cycle Power Plant (CCPP) units with a total installed capacity of under 1,400 MW 2. The core strategy of this project is to adopt units with smaller individual capacities (about 550 to 700 MW) that possess quick start-stop (Two-shifting) capabilities, thereby maximizing grid dispatch flexibility and ensuring system stability.

大林電廠新建計畫不僅在發電技術上追求卓越，其廠房設計亦充分兼顧與既有環境的融合。在建築外觀上，新廠房延續了既有廠區的「漸層藍」基調，融合白、灰色為主色調，並點綴代表天然氣管線的「藏金黃」作為局部亮點。這種設計在兼顧燃煤與燃氣機組識別需求的同時，達到了功能與美學的協調3。然而，在優美的廠房外觀之下，內部機組頻繁起停與深度調峰的動態運轉模式，卻對廠內高能管線（High-Energy Piping, HEP）系統帶來了前所未有的物理與冶金挑戰。The Dalin Power Plant’s new construction project not only pursues excellence in power generation technology but also prioritizes integration with the existing environment in its plant design. Architecturally, the new facility continues the “gradient blue” tone of the existing site, blending white and gray as the main colors, and accenting with “hidden gold”—the representative color of natural gas pipelines. This design achieves both functional and aesthetic harmony while addressing the identification needs of coal and gas units 3. However, beneath the elegant exterior, the dynamic operating mode of frequent start-stops and deep peak shaving poses unprecedented physical and metallurgical challenges to the plant’s High-Energy Piping (HEP) systems.

高能管線系統長期暴露於交變熱應力、高壓及熱疲勞的嚴苛環境中。傳統配管工程多採用 1.5D 對銲彎頭（Butt-Welding Elbow）進行管線轉向，此種設計因內含大量銲接熱影響區（Heat-Affected Zone, HAZ），往往成為潛變破裂（Creep Rupture）與疲勞失效的脆弱節點4。High-energy piping systems are exposed long-term to harsh environments characterized by alternating thermal stresses, high pressures, and thermal fatigue. Traditional piping engineering predominantly uses 1.5D Butt-Welding Elbows for pipeline routing. Because this design inherently contains extensive Heat-Affected Zones (HAZ) from welding, it often becomes a vulnerable node for creep rupture and fatigue failure 4.

為徹底解決此系統性風險，工程界與學術界提出了「以彎代銲」的「去銲接化」（De-welding）策略，並結合 3D 與 5D 大半徑冷作彎管（Cold Bend）技術與管線預製（Spool）模組化施工。本研究旨在以學術分析視角，探討大林 CCPP 專案中 3D/5D 冷作彎管的設計理念與冶金力學基礎，並全面評估模組化施工決策對專案時程、成本、廠內檢驗及現場安裝效率的多維度影響，為現代化複循環電廠的管線工程提供理論與實務兼具的決策框架。To thoroughly resolve this systemic risk, the engineering and academic communities have proposed a “de-welding” strategy of “replacing welds with bends,” combining 3D and 5D large-radius cold bending technologies with piping spool modularization construction. This study aims to explore the design concepts and metallurgical mechanics of 3D/5D cold bends in the Dalin CCPP project from an academic perspective. It comprehensively evaluates the multi-dimensional impacts of modular construction decisions on project scheduling, costs, in-factory inspections, and on-site installation efficiency, providing a robust decision-making framework for modern combined cycle power plant piping engineering.

二、 高能管線之微觀劣變機制與去銲接化之理論基礎 / II. Microscopic Degradation Mechanisms of High-Energy Piping and the Theoretical Basis of De-welding

現代化 CCPP 的高壓蒸汽與製程管線為承受極端高溫與高壓，廣泛採用了潛變強度強化鐵素體鋼（Creep Strength Enhanced Ferritic Steels, CSEF，如 ASTM A335 P91、P92、P93 等），或針對特定高腐蝕與高溫環境採用穩定型沃斯田鐵不銹鋼（如 316LN、347H 等）6。這些先進材料的優異性能建立在極其脆弱且複雜的微觀組織之上，而傳統銲接工法正是破壞此微觀平衡的最主要元凶。To withstand extreme high temperatures and pressures, the high-pressure steam and process piping of modern CCPPs widely adopt Creep Strength Enhanced Ferritic Steels (CSEF, such as ASTM A335 P91, P92, P93, etc.) or stabilized austenitic stainless steels (such as 316LN, 347H, etc.) for specific highly corrosive environments 6. The exceptional performance of these advanced materials relies on extremely fragile and complex microstructures. Traditional welding methods act as the primary culprits in disrupting this microscopic balance.

2.1 高強度合金鋼之熱影響區劣化與第四型潛變破裂 / 2.1 HAZ Degradation and Type IV Creep Rupture in High-Strength Alloy Steels

P91、P92 等 CSEF 材料的卓越高溫潛變強度，源自於其經歷正常化與回火（Normalized and Tempered, N&T）後所形成的高度均勻回火馬氏體（Tempered Martensite）組織，以及鎢、鉬等元素的固溶強化作用。更關鍵的是，微細的碳氮化物（如釩、鈮之析出物）與晶界上的 M23C6碳化物，對次晶界（Subgrain boundary）產生了強烈的釘紮作用（Pinning effect），有效阻止了位錯滑移與高溫潛變變形6。最新一代的 P93 鋼材甚至加入了鈷（Co）來抑制 δ-鐵素體軟化相，並利用硼（B）來穩定晶界碳化物以抵抗粗化7。The outstanding high-temperature creep strength of CSEF materials like P91 and P92 originates from the highly uniform tempered martensite structure formed after Normalizing and Tempering (N&T), alongside the solid solution strengthening effects of tungsten and molybdenum. Crucially, fine carbonitrides (such as vanadium and niobium precipitates) and M23C6 carbides on grain boundaries exert a strong pinning effect on subgrain boundaries, effectively preventing dislocation slip and high-temperature creep deformation 6. The latest generation of P93 steel even incorporates cobalt (Co) to suppress the δ-ferrite soft phase and utilizes boron (B) to stabilize grain boundary carbides against coarsening 7.

在傳統 1.5D 彎頭的施工實務中，每一個轉向節點均必須進行兩道極厚壁的現場對銲。銲接過程中的劇烈熱循環會對母材造成不可逆的微觀組織破壞。在眾多熱影響區中，最為致命的區塊為峰值溫度介於AC1 與 AC3 相變點之間的細晶熱影響區（Fine-Grained HAZ, FGHAZ）與臨界熱影響區（Intercritical HAZ, ICHAZ）6。在這些極其狹窄的區域內，材料經歷了不完全的沃斯田鐵化過程。原始提供強大釘紮作用的微細碳氮化物發生了部分溶解，導致材料失去抵抗變形的核心機制。隨後在銲接快速冷卻的過程中，該區域未能恢復成原始的強韌馬氏體結構，而是轉變為硬度顯著較低、位錯密度大幅下降且晶粒異常細化的軟弱組織6。In the construction practices of traditional 1.5D elbows, each routing node requires two extremely thick-walled field butt welds. The severe thermal cycles during welding cause irreversible microstructural damage to the base metal. Among the various heat-affected zones, the most lethal are the Fine-Grained HAZ (FGHAZ) and the Intercritical HAZ (ICHAZ), where peak temperatures fall between the AC1 and AC3 transformation points 6. Within these exceedingly narrow regions, the material undergoes an incomplete austenitization process. The fine carbonitrides that originally provided a strong pinning effect partially dissolve, causing the material to lose its core mechanism for resisting deformation. Subsequently, during the rapid cooling phase of welding, this region fails to recover its original tough martensitic structure, transforming instead into a weak zone with significantly lower hardness, massively reduced dislocation density, and abnormally refined grains 6.

在 CCPP 頻繁起停所伴隨的長期交變熱膨脹應力與內部蒸汽高壓的交互作用下，這層薄弱的軟弱帶極易萌生微觀潛變孔洞。這些孔洞會沿著細小的晶界迅速聚結，形成宏觀裂紋，最終導致極具毀滅性的第四型潛變破裂（Type IV Cracking）5。由於 Type IV 破裂通常孕育於管壁內部，初期的非破壞性檢驗極難察覺；一旦裂紋擴展至表面，往往意味著管線即將發生災難性的穿孔或爆裂。Under the interactive effects of long-term alternating thermal expansion stress and high internal steam pressure accompanying frequent CCPP start-stops, this thin weak zone is highly susceptible to the initiation of microscopic creep voids. These voids rapidly coalesce along fine grain boundaries to form macroscopic cracks, ultimately leading to devastating Type IV Cracking 5. Because Type IV cracking typically incubates inside the pipe wall, it is extremely difficult to detect during early non-destructive testing; once the crack propagates to the surface, it usually means the pipeline is on the verge of a catastrophic perforation or burst.

2.2 沃斯田鐵不銹鋼之敏化與動態應變時效風險 / 2.2 Sensitization and Dynamic Strain Aging Risks in Austenitic Stainless Steels

除 CSEF 材料外，大林 CCPP 中部分系統亦可能採用如 316LN 或 347H 等沃斯田鐵不銹鋼。316LN 依靠超低碳設計與氮元素的間隙固溶強化，降低了層錯能（Stacking Fault Energy），促使平面滑移並阻礙交滑移，從而獲得優異的高溫低週疲勞壽命與抗氯離子應力腐蝕開裂（Cl-SCC）能力6。然而，銲接熱循環極易引發這些不銹鋼的敏化效應（Sensitization）。銲接熱量促使鉻原子快速擴散至晶界並與碳結合形成碳化鉻，導致晶界附近出現貧鉻區，使其在後續運轉中極易遭受晶界腐蝕6。雖然 347H 採用高碳與鈮（Nb）的穩定化設計來對抗敏化，但其熱影響區在長期服役下，仍面臨應力鬆弛開裂（SRC）、再熱裂紋以及 Sigma 相脆化之高度風險。In addition to CSEF materials, some systems in the Dalin CCPP may adopt austenitic stainless steels such as 316LN or 347H. 316LN relies on an ultra-low carbon design and interstitial solid solution strengthening of nitrogen to lower its Stacking Fault Energy (SFE). This promotes planar slip and impedes cross-slip, yielding excellent high-temperature low-cycle fatigue life and resistance to chloride-induced stress corrosion cracking (Cl-SCC) 6. However, welding thermal cycles can easily trigger the sensitization effect in these stainless steels. Welding heat causes chromium atoms to quickly diffuse to grain boundaries and bond with carbon to form chromium carbides, resulting in chromium-depleted zones that leave the boundaries highly vulnerable to intergranular corrosion during subsequent operations 6. Although 347H employs a high carbon and niobium (Nb) stabilization design to resist sensitization, its heat-affected zones still face high risks of stress relaxation cracking (SRC), reheat cracking, and Sigma phase embrittlement under long-term service.

2.3 去銲接化之物理底線與流體動力學效益 / 2.3 Physical Baseline and Fluid Dynamics Benefits of De-welding

面對極端複雜的微觀冶金劣化機制，「去銲接化」策略旨在透過宏觀物理手段直接豁免微觀冶金風險。此策略利用直管在常溫下，透過機械應力一體成型（如旋轉拉彎工法），徹底消除轉向處的高風險銲口4。這不僅是施工程序的簡化，更是基於物理底線的風險排除。消除 HAZ 意味著管線系統在應力最集中的轉彎處，其潛變壽命基準直接回歸至無縫鋼管母材的標準，徹底根除了 Type IV 破裂的發生機率9。Faced with highly complex micro-metallurgical degradation mechanisms, the “de-welding” strategy aims to directly exempt these risks through macroscopic physical means. This strategy utilizes straight pipes integrally formed by mechanical stress at room temperature (e.g., rotary draw bending) to completely eliminate high-risk welds at routing turns 4. This is not merely a simplification of construction procedures but a fundamental risk elimination. Eradicating the HAZ means that the creep life baseline of the piping system at the most stress-concentrated bends returns directly to the standard of seamless base metal pipes, thoroughly eliminating the probability of Type IV cracking 9.

在流體動力學層面，傳統 1.5D 彎頭因曲率半徑過小，流體流經時會在彎頭內壁產生極高的衝擊速度與嚴重的流場擾動，進而誘發流動加速腐蝕（Flow-Accelerated Corrosion, FAC）或點蝕，導致管壁急劇減薄甚至穿孔。採用大半徑的 5D 冷作彎管，其平緩的幾何過渡大幅減少了流場亂流與阻力係數，使流場更趨近於層流，顯著降低流體對管壁的衝擊動能。這對於延長高壓蒸汽或侵蝕性化學介質管線的使用壽命具有決定性影響10。At the fluid dynamics level, traditional 1.5D elbows possess too small a radius of curvature. Fluids flowing through them generate extremely high impact velocities and severe flow turbulence on the inner walls, inducing Flow-Accelerated Corrosion (FAC) or pitting, which rapidly thins or perforates the pipe wall. By adopting large-radius 5D cold bends, the gentle geometric transition significantly reduces flow turbulence and resistance coefficients, making the flow closer to laminar and substantially decreasing the fluid’s kinetic impact on the wall. This has a decisive effect on extending the service life of pipelines transporting high-pressure steam or aggressive chemical media 10.

三、 ASME 規範框架下的冷作彎管應力與幾何力學解析 / III. Stress and Geometric Mechanics Analysis of Cold Bending Pipes under the ASME Code Framework

在大林 CCPP 專案中推行 3D 與 5D 冷作彎管，必須建立在嚴謹的國際規範與力學分析框架之上。2026 年新版 ASME B31.1/B31J 法規對現場銲接提出了極其嚴苛的合規門檻。ASME 配管規範不僅定義了管線設計的合法性邊界，更提供了評估彎管力學響應的數學模型。Implementing 3D and 5D cold bends in the Dalin CCPP project must be founded on a rigorous international regulatory and mechanical analysis framework. The 2026 updated ASME B31.1/B31J codes have introduced extremely strict compliance thresholds for field welding. ASME piping codes not only define the legal boundaries of piping design but also provide mathematical models to evaluate the mechanical responses of pipe bends.

3.1 ASME B31.1 與 B31.3 之風險管理哲學差異 / 3.1 Differences in Risk Management Philosophy between ASME B31.1 and B31.3

大林電廠的動力管線系統必須嚴格遵守 ASME B31.1《動力配管規範》。相較於石化產業常用的 B31.3《製程管線規範》，B31.1 面對高溫、高壓且具高能量釋放風險的流體，採取了極度保守的「規定性」與「厚度導向」設計哲學5。最顯著的差異在於安全係數的設定：B31.1 高達 4.0，而 B31.3 僅為 3.0 5。The power piping systems of the Dalin Power Plant must strictly adhere to the ASME B31.1 “Power Piping Code.” Compared to the B31.3 “Process Piping Code” commonly used in the petrochemical industry, B31.1 adopts a highly conservative “prescriptive” and “thickness-oriented” design philosophy when dealing with high-temperature, high-pressure fluids that carry significant energy release risks 5. The most prominent difference lies in the safety factors: B31.1 demands a high safety factor of 4.0, whereas B31.3 requires only 3.0 5.

此厚度導向的設計對冷作彎管的製造提出了嚴峻挑戰。彎管在常溫下經歷巨幅塑性變形，必然伴隨外弧側（Extrados）的材料拉伸與壁厚減薄，以及內弧側（Intrados）的壓縮增厚6。針對操作溫度超過750°F的高能管線，B31.1 強制要求進行超音波測厚（UT）驗證，以確保彎曲後的剩餘壁厚不低於理論最小壁厚（tm）。若減薄率控制不佳導致壁厚不足，局部環向應力（Hoop Stress）將被成倍放大，進一步加速潛變劣化12。This thickness-oriented design poses severe challenges for cold bend manufacturing. Bends undergo massive plastic deformation at room temperature, inevitably resulting in material stretching and wall thinning on the extrados, alongside compression and thickening on the intrados 6. For high-energy piping operating above 750°F, B31.1 strictly mandates ultrasonic thickness (UT) verification to ensure the remaining wall thickness after bending is not less than the theoretical minimum wall thickness (tm). If poor thinning rate control leads to insufficient wall thickness, local hoop stress multiplies, accelerating creep degradation 12.

3.2 ASME B31J 規範與應力強度因子（SIF）解耦模型 / 3.2 ASME B31J Code and SIF Decoupling Model

在探討管線疲勞與熱膨脹應力時，必須引入應力強度因子（Stress Intensification Factor, SIF，規範符號為 i）與柔性因子（Flexibility Factor, k）。最新版 ASME B31J 規範針對各類金屬配管元件，提供了精細化且力學解耦的 SIF 計算模型，取代了以往較為粗略的經驗公式13。When evaluating piping fatigue and thermal expansion stresses, the Stress Intensification Factor (SIF, symbol i) and Flexibility Factor (k) must be introduced. The latest ASME B31J code provides a refined and mechanically decoupled SIF calculation model for various metallic piping components, replacing earlier, rougher empirical formulas 13.

SIF 反映了管線元件因幾何形狀改變而相對於直管產生的應力放大效應。其計算依賴於無因次參數——柔性特徵值（Flexibility Characteristic, h），公式如下15：SIF reflects the stress amplification effect generated by a piping component relative to a straight pipe due to its geometric shape. Its calculation relies on a dimensionless parameter—the Flexibility Characteristic (h), formulated as 15:

h=T⋅R1/r22

其中，T 為彎管公稱壁厚，R1 為彎曲半徑（Bend Radius）， r2為匹配管線之平均半徑。ASME B31J 將彎管承受彎矩的狀態精確解耦為面內（In-plane）與面外（Out-of-plane）方向，其 SIF 計算公式為6：Here, T is the nominal wall thickness of the bend, R1 is the bend radius, and r2 is the mean radius of the matching pipe. ASME B31J precisely decouples the bending moment state into in-plane and out-of-plane directions, with respective SIF formulas 6:

ii=0.9/h2/3

io=0.75/h2/3

根據規範，SIF 計算值皆不得小於 1.0；在無詳細數據時，應選用面內與面外之較大者進行綜合評估13。由公式可知，彎管曲率半徑 R1 越大，柔性特徵值 h 亦隨之增大，從而導致 SIF 呈指數級衰減。傳統 1.5D 短半徑彎頭因 R1 較小，會產生顯著幾何應力集中，SIF 遠大於 1.0，成為吸收交變熱應力時易發生疲勞破壞的脆弱節點。相對而言，大半徑彎管的 SIF 顯著較低，為去銲接化提供了堅實的力學正當性。Per the code, SIF values cannot fall below 1.0; absent detailed data, the larger of the in-plane or out-of-plane values should be used10. The formulas indicate that a larger bend radius R1 increases the flexibility characteristic h, causing the SIF to decay exponentially. Traditional 1.5D short-radius elbows, with a small R1, generate significant geometric stress concentrations resulting in an SIF well above 1.0, making them vulnerable to fatigue failure when absorbing alternating thermal stress. Consequently, the significantly lower SIF of large-radius bends provides robust mechanical justification for de-welding.

此外，冷作彎管在成型時發生的截面橢圓化（Ovalization）效應，從結構力學觀點來看，這種截面慣性矩的改變賦予了彎管大於 1 的柔性因子（k > 1）。這意味著彎管較同長度直管具備更佳的彈性變形能力，能更有效吸收與釋放管線因熱膨脹產生的位移應力14。然若彎管末端連接法蘭（Flange），法蘭的強大剛性將限制橢圓化能力，ASME B31J 會給予較低的柔性因子評估4。Furthermore, the cross-sectional ovalization effect occurring during cold bend forming alters the cross-sectional moment of inertia, granting the bend a flexibility factor greater than 1 (k > 1) from a structural mechanics perspective. This means the bend possesses superior elastic deformation capabilities compared to a straight pipe of equal length, allowing it to more effectively absorb and release thermal expansion displacement stresses 14. However, if a flange is welded to the bend’s end, its rigidity restricts ovalization, prompting ASME B31J to assign a reduced flexibility factor 4.

四、 基於管徑分級之 3D/5D 冷作彎管設計決策邏輯 / IV. Design Decision Logic for 3D/5D Cold Bending Pipes Based on Pipe Size Classification

在理解冷作彎管的力學優勢與微觀冶金原理後，下一個挑戰是如何在極其擁擠的電廠廠房內，合理配置這些體積龐大的元件。大林 CCPP 專案針對工程、採購與建造（EPC）承包商面臨的物理限制，制定了基於管徑分級的 3D 與 5D 冷作彎管應用策略5。Having understood the mechanical advantages and micro-metallurgical principles of cold bends, the next challenge is allocating these bulky components within heavily congested power plant buildings. Addressing the physical constraints faced by Engineering, Procurement, and Construction (EPC) contractors, the Dalin CCPP project formulated an application strategy for 3D and 5D cold bends based on pipe size classification 5.

彎管幾何類型/ Bend Geometry Type 彎曲半徑 (R1​)定義/Bend Radius(R1​)            Definition 應力強度因子(SIF)評估/SIF Evaluation 柔性因子與空間佔用/ Flexibility Factor& Space Occupation 實務分級應用對象/Practical Classified Application 疲勞與潛變失效風險/Fatigue& Creep Failure Risk
1.5D   對銲彎頭 /1.5D Butt-Welding Elbow 1.5*OD 遠大於 1.0(高幾何應力集中)/>> 1.0 (High geometric stress concentration) 柔性極低，空間佔用極小/Very low flexibility, minimal space 全管徑(傳統標準件)/ All diameters (Traditional standard) 極高(含兩道 HAZ，易生 Type IV) /Extremely high (Contains 2 HAZs, prone to Type IV)
3D    冷作彎管 /        3D Cold Bend 3.0*OD 中等偏低，較1.5D顯著下降/ Medium-low, significantly lower than 1.5D 柔性佳，空間佔用中等/Good flexibility, medium space 中管徑(2.5″ 至 8″)/Medium diameter(2.5″to8″) 低(無銲接熱影響區)/Low (No welding HAZ)
5D     冷作彎管 /        5D Cold Bend 5.0*OD 趨近完美的 1.0(等同直管)/Near perfect 1.0 (Equivalent to straight pipe) 柔性極佳，空間佔用巨大/

Excellent flexibility, massive space

 小管徑 (2″ 及以下)/

Small diameter(2″ and under)

 極低(流場平滑，無銲口)/

Extremely low(Smooth flow, no welds)

4.1 小管徑系統：極大化柔性的 5D 彎管策略 / 4.1 Small-Diameter Systems: 5D Bending Strategy for Maximized Flexibility

針對 2 英吋及以下的管線系統（如高壓儀表取樣線、洩水系統等），專案統一採用 5D 冷作彎管。這類小管徑系統在廠房內的空間配置相對靈活。由於高壓小管徑管線本身具備極大的結構剛性，採用短半徑轉向將導致吸收熱位移的能力極差。採用 5D 大半徑設計，能極大化系統整體柔性4。For piping systems 2 inches and below (e.g., high-pressure instrument sampling lines and drains), the project uniformly adopts 5D cold bends. These small-diameter systems enjoy relatively flexible spatial configurations. Because high-pressure small-diameter pipes inherently possess extreme structural rigidity, short-radius routing yields poor capability to absorb thermal displacements. A 5D large-radius design maximizes the system’s overall flexibility 4.

從 ASME B31J 的數值分析來看，2 英吋以下 5D 彎管的 SIF 值趨近於完美的 1.0，幾乎等同直管的應力狀態，不產生額外應力集中5。這使小管徑管線能從容吸收主系統傳遞的劇烈位移應力，避免轉向處發生疲勞斷裂。ASME B31J numerical analysis shows the SIF value for 5D bends under 2 inches approaches a perfect 1.0, nearly equivalent to a straight pipe’s stress state, generating no extra stress concentration 5. This allows small-diameter pipes to comfortably absorb severe displacement stresses from primary systems without fatigue fracturing at the turns.

4.2 中管徑系統：空間與應力平衡的 3D 彎管策略 / 4.2 Medium-Diameter Systems: 3D Bending Strategy Balancing Space and Stress

針對 2.5 英吋至 8 英吋的中管徑系統，若採用 5D 彎管，其龐大的迴轉半徑將佔用驚人的廠房空間，引發嚴重的佈管干涉5。因此，專案統一採用 3D 冷作彎管。3D 彎管的 SIF 雖略高於 5D，但較 1.5D 對銲彎頭已獲得根本改善。採用 3D 彎管能在「空間限制」與「消除銲口」之間取得最完美的實務平衡5。For medium-diameter systems (2.5 to 8 inches), using 5D bends would occupy an astonishing amount of plant space, triggering severe routing interference5. Thus, the project uniformly utilizes 3D cold bends. Although a 3D bend’s SIF is slightly higher than a 5D’s, its stress concentration is fundamentally improved compared to a 1.5D elbow. Utilizing 3D bends achieves a perfect practical balance between “spatial constraints” and “eliminating welds” 5.

4.3 彎曲應變率與彎後熱處理（PBHT）之冶金必然性 / 4.3 Metallurgical Necessity of Bending Strain Rate and Post-Bend Heat Treatment (PBHT)

冷作彎管宏觀成型本質上是微觀晶格嚴重畸變與位錯密度激增的過程。成型應變率（Strain, ε）幾何概算公式為： Macroscopic cold bend forming essentially involves severe micro-lattice distortion and a surge in dislocation density. The forming strain rate (ε) formula is:

ε≈(r/R)×100%

其中，r 為管線外部半徑，R 為彎曲半徑。推導可知，3D 彎管外弧側最大成型應變約為 16.67%，5D 彎管約為 10%5。兩者皆遠超出冶金法規與 ASME 規範 5% 的免除熱處理極限值。高達 10% 或 16.67% 的冷作變形量若未經適當熱處理，極高殘餘應力與晶格缺陷將不可逆地破壞 P91/P92 的長期潛變強度，並加速脆性金屬間化合物粗化6。因此，執行彎後熱處理（Post-Bend Heat Treatment, PBHT）具備不可妥協的冶金必然性。Where r is the pipe’s outer radius and R is the bend radius. Derivations show the maximum extrados strain for a 3D bend is roughly 16.67%, and 10% for a 5D bend5. Both far exceed the 5% heat treatment exemption threshold set by metallurgical and ASME codes. Without proper heat treatment, the massive residual stresses and lattice defects from 10% or 16.67% cold deformation irreversibly destroy the long-term creep strength of P91/P92 materials and accelerate brittle intermetallic compound coarsening 6. Thus, Post-Bend Heat Treatment (PBHT) is an uncompromising metallurgical necessity.

對於應變約 10% 的 5D 彎管，可依規範採用730°C 至 780°C 的次臨界消除應力處理（Subcritical Stress Relief），驅動回復（Recovery）作用以消解殘餘應力並穩定微觀組織6。然而，應變高達 16.67% 的 3D 彎管，極端冷變形恐導致次晶界網絡嚴重破碎，單純次臨界處理無法修復甚至可能加速劣變。此時必須依規執行完全的正常化與回火（N&T）熱處理，重構回火馬氏體組織6。嚴格遵照 ASME B31.1 執行 PBHT，是確保 B31J 應力分析演算法具備物理真實性的唯一途徑6。For 5D bends with ~10% strain, Subcritical Stress Relief at 730°C to 780°C can drive recovery to dissipate residual stress and stabilize microstructures 6. However, the extreme cold deformation of 3D bends (16.67% strain) can severely fragment subgrain boundaries, rendering subcritical treatment insufficient or even detrimental. In this case, full Normalizing and Tempering (N&T) heat treatment must be executed to reconstruct the tempered martensite6. Strictly following ASME B31.1 for PBHT is the only way to ensure the physical authenticity of B31J stress analysis algorithms 6.

五、 模組化 (Spool) 施工與剛體悖論之系統整合 / V. System Integration of Modularization (Spool) Construction and the Rigid Body Paradox

模組化（Modularization）與管線預製（Spool Fabrication）策略，是將高風險、受氣候影響的現場高空作業，移轉至環境受控工廠內進行的核心專案管理哲學16。導入 3D/5D 冷作彎管以實踐「去銲接化」，為模組化施工提供了極佳契機。然而，EPC 團隊必須克服設計與施工間的「剛體悖論」（Rigid Body Paradox）2。Modularization and Spool Fabrication represent a core project management philosophy that relocates high-risk, weather-dependent field high-altitude work into controlled factory environments 16. Introducing 3D/5D cold bends to realize “de-welding” provides an excellent integration opportunity for modular construction. However, EPC teams must overcome the “Rigid Body Paradox” between design and construction 2.

5.1 深諳實務之管線設計師於預製管段 (Spool) 規劃之實質效益 / 5.1 The Substantial Benefit of Experienced Piping Designers in Spool Planning

在探討模組化與剛體悖論時，必須強調：由深諳配管工程實務的資深管線設計師全面評估與安排預製管段（Spool），能為專案帶來決定性的實質幫助5。在 3D CAD/CAE 設計環境中，若僅為追求「零銲口」而盲目極大化單一 Spool 尺寸，這些在虛擬空間完美且毫無阻力的巨型管段，運抵大林現場後勢必遭遇密集鋼構框架、發電設備及錯綜管廊等三維空間挑戰5。經驗豐富的設計師具備強大預判能力，在規劃之初便會將吊車（Crane）作業半徑、吊裝角度及物流動線等嚴格物理極限納入考量，從源頭規避設計與現場執行的巨大斷層5。When discussing modularization and the rigid body paradox, it is crucial to emphasize that having deeply experienced piping designers evaluate and plan the prefabricated spools yields decisive practical benefits 5. In 3D CAD/CAE design environments, blindly maximizing spool sizes solely to pursue “zero welds” creates giant segments that face no resistance virtually but will inevitably clash with dense steel frames, equipment, and pipe racks on-site 5. Experienced designers leverage powerful foresight, comprehensively incorporating physical constraints like crane operating radii, hoisting angles, and logistics into initial planning, thereby preventing the massive gap between design and field execution right from the source 5.

5.2 剛體悖論與模組化邊界的動態最佳化 / 5.2 The Rigid Body Paradox and Dynamic Optimization of Modularization Boundaries

當巨型冷彎 Spool 因空間干涉無法順利定位時，現場工程師往往被迫將完美預製的無銲口 Spool 進行裁切。管線切斷後，必須在危險狹小的高空環境重新打磨、對心（Fit-up）並實施高強度合金銲接5。這不僅憑空增加現場銲口、破壞「去銲接化」美意，更因現場環境惡劣導致預熱與銲後熱處理（PWHT）品質難以掌控，使 Type IV 潛變破裂風險死灰復燃。無端增加的非破壞性檢驗（NDE）與熱處理作業也將嚴重拖垮專案進度與成本5。When spatial interference prevents giant spools from being positioned, field engineers are forced to cut the perfectly prefabricated zero-weld spools. After cutting, teams must redo bevel grinding, fit-ups, and high-strength alloy welding in hazardous high-altitude environments 5. This adds unnecessary field welds, ruining the intent of de-welding, and the harsh environment compromises pre-heating and PWHT quality, reigniting Type IV cracking risks. The resulting extra NDE and heat treatment drastically drag down project schedules and inflate costs 5.

為打破「剛體悖論」，模組化決策本質上必須轉化為多目標最佳化問題。最佳的 Spool 設計必須在「極小化銲口數量」與「確保現場可吊裝與可安裝性」間取得動態平衡。這要求工程設計部門導入四維（4D）施工動態模擬，將運輸限制、鋼構穿梭路徑及吊具作業範圍納入設計邊界條件運算，產出具備施工可行性的 Spool 切割方案5。To overcome the “Rigid Body Paradox,” modularization must become a multi-objective optimization problem. Optimal spool design dynamic balances “minimizing weld quantities” with “ensuring field hoistability and installability.” This requires implementing 4D construction dynamic simulations, integrating transport limits, structural routing paths, and lifting constraints into design boundaries to produce constructible spool cutting plans 5.

六、 去銲接化與模組化對專案績效之多維度影響分析 / VI. Multi-Dimensional Impact Analysis of De-welding and Modularization on Project Performance

將 3D/5D 冷作彎管技術與嚴謹模組化 Spool 策略深度整合，對大林 CCPP 專案的時程、成本、廠內檢驗與現場安裝效率，產生了深遠且全面的正面連鎖效應。Deeply integrating 3D/5D cold bending technology with strict modular spool strategies has generated profound, comprehensive positive effects on the Dalin CCPP project’s schedule, costs, in-factory inspection, and on-site installation efficiency.

6.1 對專案時程的影響 (Schedule Impact) / 6.1 Schedule Impact

模組化施工成功將傳統的「順序性作業」轉化為「平行作業」。傳統工法中，P91/P92 高強度合金鋼的現場銲接是牽制竣工的關鍵路徑（Critical Path）。單一銲口需經歷長時間預熱、銲接、氫釋放處理，以及耗時極長的 PWHT 與 NDE 檢驗，作業週期動輒數日。透過冷彎模組化，龐大複雜的管線成型得以在工廠內與現場土建同步展開。當預製 Spool 運抵現場，安裝時程從數月急遽壓縮至數週，大幅消弭了關鍵路徑耗時，為後續試車與併網商轉創造寶貴時間裕度5。Modular construction successfully converts traditional “Sequential Operations” into “Parallel Operations.” Traditionally, field welding of P91/P92 high-strength alloys is the critical path delaying completion. A single weld requires lengthy pre-heating, welding, hydrogen bake-out, and extremely time-consuming PWHT and NDE, taking several days. With cold bend modularization, massive piping forming occurs in factories parallel to site civil work. When pre-fab spools arrive, installation shrinks from months to weeks, eliminating critical path delays and securing precious time for commissioning and grid connection 5.

6.2 對專案成本的影響 (Cost Impact) / 6.2 Cost Impact

  1. 初始資本支出（CAPEX）優化： 去銲接化省去了採購昂貴5D 鍛造或無縫彎頭的材料費。儘管有冷彎成型與廠內 PBHT 成本，但免除了大量現場高級銲材、PWHT 設備租賃與高昂工時。無銲口設計更使 RT、UT、MT 等 NDE 檢驗數量呈「斷崖式下降」，大幅節省第三方檢驗與品質認證成本2。 CAPEX Optimization: De-welding eliminates the material costs of expensive 1.5D forged or seamless elbows. Despite cold forming and factory PBHT costs, savings from eliminating premium welding consumables, PWHT rentals, and prolonged labor hours are immense. The zero-weld design precipitates a “cliff-like drop” in NDEs (RT, UT, MT), saving massive third-party inspection costs 2.
  2. 長期營運維護成本（OPEX）極小化： 高壓蒸汽管線銲道是法規強制在役檢查（ISI）的首要目標。徹底消除高風險銲口節點，使電廠能合法豁免龐大的銲道檢測工作與潛在重工成本。5D 彎管平滑流場降低了 FAC 速率，延長管線壽命，進一步壓低維護替換成本7。 Minimizing Long-Term OPEX: High-pressure steam welds are primary targets for mandatory In-Service Inspections (ISI). Eliminating these high-risk nodes legally exempts the plant from massive weld inspections and potential rework costs. The smooth flow of 5D bends curtails FAC, extending piping life and suppressing long-term maintenance costs 7.

6.3 對廠內檢驗與品質控制的影響 (In-Factory Inspection Impact) / 6.3 In-Factory Inspection Impact

將成型與熱處理移至環境穩定的預製工廠，徹底顛覆了檢驗的可靠度與品質一致性5。Relocating forming and heat treatment to environmentally stable factories completely revolutionizes inspection reliability and quality consistency 5.

  • 精準幾何與壁厚控制： 針對 ASME B31.1 壁厚驗證，廠內可利用高解析度 UT 對彎管外弧側進行無死角掃描。先進模具與芯棒技術能有效控制截面橢圓度，確保結構完整性8。 Precise Geometric and Wall Thickness Control: For ASME B31.1 wall thickness verification, factories execute zero-blind-spot UT scans on the bend extrados. Advanced molds and mandrels control ovality, ensuring structural integrity 8.
  • 卓越冶金熱處理重現性： 廠內採用中頻感應熱處理（IH-PBHT）或溫控恆溫爐，確保全體積受熱的溫度梯度與速率標準化，完美消除殘餘應力並修復晶格。相較之下，現場惡劣氣候往往導致局部 PWHT 溫度不均。廠內製程的冶金品質具備壓倒性優勢6。 Exceptional Metallurgical PBHT Reproducibility: Factories utilize Induction Heating (IH-PBHT) or isothermal furnaces, ensuring standardized temperature gradients and full-volume heating that perfectly repair lattices and eliminate stress. Conversely, harsh field conditions often cause uneven local PWHT temperatures. Factory metallurgical quality is overwhelmingly superior 6.

6.4 對現場安裝效率與工業安全的影響 (On-Site Installation Efficiency) / 6.4 On-Site Installation Efficiency

  • 紓解缺工與人為失誤極小化： 模組化將龐大銲接工時轉移至廠內自動化完成。現場僅餘少數對接（Tie-in）銲口，突破高階銲工短缺困境，同時降低疲勞導致的人為銲接瑕疵機率。 Alleviating Labor Shortages and Minimizing Errors: Modularization shifts massive welding to factory automation, leaving only minor tie-in welds on-site. This circumvents severe shortages of top-tier welders and minimizes human fatigue-induced defects.
  • 鷹架成本革命性削減： 傳統高空管段對心與銲接需搭設龐大鷹架。預製 Spool 大量取代散材後，鷹架需求銳減，節省間接成本並消弭高空墜落等工安風險。 Revolutionary Scaffolding Cost Reductions: Traditional high-altitude fit-ups require massive scaffolding. Using pre-fab spools slashes scaffolding needs, cutting indirect costs and eradicating fall hazards.
  • 隨插即用的極速安裝： 克服剛體悖論後，精準預製的 Spool 如同大型樂高，透過吊車一次定位鎖固，顛覆傳統配管節奏，極大提升安裝推進率與整體效率。 Plug-and-play Rapid Installation: Overcoming the rigid body paradox allows precision spools to be installed like giant Lego blocks via single crane lifts, overthrowing traditional pacing and skyrocketing installation efficiency.

七、 實務決策與工法應用：業主、EPC與製造商之多維度考量 / VII. Practical Decisions and Application of Methods: Multi-Dimensional Considerations of Owners, EPC, and Manufacturers

落實冷作彎管策略需要業主、EPC 統包商及專業製造商達成高度共識。 Implementing the cold bend strategy requires profound consensus among owners, EPC contractors, and professional manufacturers.

7.1 業主營運視角：高能管線之維護管理與營運決策 / 7.1 Owner’s Operational Perspective: Maintenance Management and Operational Decisions of High-Energy Piping

對營運業主而言，管線可靠度與 OPEX 是核心決策指標。傳統 1.5D 彎頭的銲接 HAZ 極易引發 Type IV 潛變破裂，需在未來歲修（ISI）投入龐大 NDE 預算。採用 3D/5D 冷作彎管的「去銲接化」策略，使壽命基準回歸無縫母材，直接豁免重工風險並大幅削減 NDE 成本。5D 彎管的平滑流場更降低了 FAC 風險，確保電廠全生命週期安全7。 For owners, piping reliability and OPEX are core indicators. Traditional 1.5D elbow HAZs easily induce Type IV cracking, demanding massive NDE budgets during future ISIs. The “de-welding” strategy using 3D/5D cold bends returns the lifespan baseline to seamless pipe standards, directly avoiding rework and slashing NDE costs. The smooth flow of 5D bends also lowers FAC risks, ensuring safe lifecycle operation 7.

7.2 EPC 設計視角：空間排列限制與實務模組化考量 / 7.2 EPC Design Perspective: Spatial Layout Constraints and Practical Modularization Considerations

EPC 設計單位必須在有限廠房空間內取得「消除銲口」與「防範干涉」的精確平衡。針對中管徑（2.5″~8″）統一採用 3D 冷彎以避免空間干涉；針對小管徑（2″ 以下）高壓剛性系統則採用 5D 彎管極大化柔性以吸收位移應力5。同時，必須深入考量「剛體悖論」，預先將現場吊裝路徑納入設計，避免巨型管段現場裁切重工5。EPC designers must precisely balance “eliminating welds” and “preventing interference” within limited space. They uniformly adopt 3D bends for medium diameters (2.5″~8″) to avoid spatial conflicts, and 5D bends for small-diameter (2″ and under) highly rigid systems to maximize flexibility against displacement stress 5. Concurrently, they must incorporate the “Rigid Body Paradox” into early planning, factoring field lifting paths to avoid forced on-site rework of giant segments 5.

7.3 製造與施工視角：3D/5D 冷作彎管導入「潁璋工程三合一工法」之效益 / 7.3 Manufacturing and Construction Perspective: Benefits of Adopting the “3-in-1 Method” by Yin-Chang Engineering for 3D/5D Cold Bending

為將冷作彎管效益最大化，實務上可導入本土專業製造商「潁璋工程」的「三合一工法」。該工法將數控冷作彎管（CNC）、管端機械精密開槽與內部清潔檢驗整合於單一自動化工作站4。在此過程中，潁璋工程團隊會同步檢視並建議 ISO 圖的佈管最佳化方案，透過與管線設計師的雙向溝通，確保預製管段（Spool）規劃能發揮最大的現場實質安裝效益5。針對 P91 等高強度合金，該工法確保了幾何精準度，隨後實施嚴格的溫控亞臨界 PBHT 與去磁技術，大幅提升管線安全性並降低施工成本，成為突破高能管線極端工況的關鍵方案18。To maximize cold bend benefits, practice adopts the “3-in-1 method” from the local manufacturer “Yin-Chang Engineering.” This integrates CNC cold bending, precise mechanical pipe-end beveling, and internal cleaning inspections into a single automated workstation 4. During this process, the Yin-Chang engineering team synchronously reviews and suggests ISO drawing routing optimization. Through two-way communication with piping designers, they ensure the spool planning achieves maximum on-site installation benefits 5. For high-strength alloys like P91, this method guarantees geometric accuracy followed by strict temperature-controlled subcritical PBHT and demagnetization, vastly elevating piping safety and cutting construction costs, representing a key solution for extreme high-energy piping conditions 18.

7.4 法規衝擊與合規因應：2026 年新版 ASME B31.1/B31J 之嚴苛現場銲接門檻 / 7.4 Regulatory Impact and Compliance Strategies: Strict Field Welding Thresholds of the 2026 ASME B31.1/B31J Codes

ASME B31.1 規範在 2024 與 2026 版的連續更新，對 P91/P92 高壓管線的設計與施工產生了顛覆性影響。新規範針對現場銲接提出了極其嚴苛的合規門檻。最具衝擊性的變革在於 B31J 的強制導入，以及針對高溫潛變服役管線的銲接強度折減係數（W）採取了擴大的懲罰機制21。Successive updates to the ASME B31.1 code in 2024 and 2026 have disruptively impacted P91/P92 high-pressure piping design and construction. The new codes impose extremely strict compliance thresholds on field welding. The most impactful change is the mandatory introduction of B31J and the expanded penalty mechanism applied to the Weld Strength Reduction Factor (W) for pipelines serving in high-temperature creep ranges 21.

傳統 1.5D 現場對銲彎頭因 HAZ 承受極高局部尖峰應力，在新規範折減下，理論疲勞壽命與潛變強度面臨大幅縮水。EPC 若繼續採用大量現場銲接工法，不僅需面臨密集的 NDE 與嚴苛的 PWHT 驗收標準，甚至在設計初期即無法通過應力核算。因此，採用 3D/5D 冷作彎管實踐「去銲接化」，已不再是節省成本的彈性選項，而是面對 2026 年新規範時規避龐大合規風險、確保系統合法通過審核的必然決策3。Because the HAZ of traditional 1.5D field elbows inevitably bears extremely high local peak stresses, their theoretical fatigue life and creep strength shrink dramatically under new code reductions. If EPCs continue employing massive field welding, they will face denser NDEs, stricter PWHT acceptances, and potential stress calculation failures during early design. Thus, adopting 3D/5D cold bends to implement “de-welding” is no longer a flexible cost-saving option, but an inevitable practical decision to evade massive compliance risks and ensure legal system approval under the 2026 new codes 3.

八、 結論 / VIII. Conclusion

大林 CCPP 專案為因應再生能源併網帶來的頻繁起停需求，針對高能管線系統採取的 3D/5D 冷作彎管與模組化預製決策，深度融合了尖端材料冶金學、法規應力力學與現代專案管理哲學。In response to frequent start-stops driven by renewable energy integration, the Dalin CCPP project’s adoption of 3D/5D cold bends and modular prefabrication deeply fuses cutting-edge metallurgy, regulatory stress mechanics, and modern project management.

本研究總結三大核心結論：This study summarizes three core conclusions:

第一，冶金與力學設計的完美妥協。 針對 P91/P92 等高強度合金，去銲接化從根本上消除了引發 Type IV 破裂的熱影響區。透過中管徑採用 3D、小管徑採用 5D 彎管的分級策略，在 ASME B31.1 的保守壁厚裕度與 ASME B31J 的 SIF 解耦模型中，成功實現廠房空間與管線柔性的最佳動態平衡。 First, A Perfect Compromise Between Metallurgy and Mechanical Design. For P91/P92 alloys, de-welding fundamentally eradicates the HAZ responsible for Type IV cracking. By classifying 3D bends for medium diameters and 5D for small ones, the project successfully dynamic-balances spatial limits and piping flexibility within ASME B31.1’s conservative wall-thickness margins and ASME B31J’s SIF decoupled models.

第二，克服剛體悖論發揮模組化極致。 模組化 Spool 的成功取決於 3D 虛擬設計與嚴酷施工條件的無縫對話。透過 4D 施工模擬與資深設計師的雙向溝通，將吊裝極限與空間干涉納入切割邊界考量，避免巨型管段現場被迫裁切重工，真正實踐以彎代銲的初衷。 Second, Overcoming the Rigid Body Paradox to Maximize Modularization. Modular spool success relies on seamless dialogue between 3D virtual design and harsh field conditions. Using 4D simulations and two-way communication with senior designers to factor hoisting limits and spatial conflicts into cutting boundaries prevents forced on-site rework, truly realizing the intent of replacing welds with bends.

第三，合規規避風險與專案績效全面躍升。 整合冷彎技術與模組化，成功將高風險作業移轉至廠內，斷崖式降低 NDE 與熱處理成本，紓解缺工危機，並透過精準 PBHT 確保長效壽命。面對 2026 版 ASME 新規範的嚴苛門檻，此策略有效規避了合規風險，其平行施工作業模式更極大提升了工安標準與安裝效率，為現代化複循環發電廠管線工程樹立了實務典範。 Third, Compliance Risk Evasion and Comprehensive Performance Leaps. Integrating cold bending with modularization shifts high-risk tasks to factories, slashing NDE and heat treatment costs, mitigating labor shortages, and ensuring longevity via precise PBHT. Facing the strict thresholds of the 2026 ASME codes, this strategy effectively evades compliance risks. Its parallel construction mode greatly elevates safety and installation efficiency, establishing a practical paradigm for modern CCPP piping engineering.

參考文獻 / References

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