{"id":3882,"date":"2017-08-31T20:31:35","date_gmt":"2017-08-31T12:31:35","guid":{"rendered":"http:\/\/www.octalsteel.com\/?p=3882"},"modified":"2025-12-24T17:12:52","modified_gmt":"2025-12-24T09:12:52","slug":"cra-cladding-lined-pipe","status":"publish","type":"post","link":"https:\/\/www.octalsteel.com\/cra-cladding-lined-pipe\/","title":{"rendered":"CRA Clad, Lined, Weld Overlay Pipe Cladding- Bimetal Pipes"},"content":{"rendered":"<h2>What is clad pipe<\/h2>\n<p>In CRA service, <em data-start=\"101\" data-end=\"120\">clad pipe meaning<\/em> refers to a bimetal (bimetallic) pipe construction that combines a carbon steel backing pipe for strength with a corrosion-resistant alloy layer or liner on the wetted surface for corrosion protection. In project language, this is often written as <strong data-start=\"369\" data-end=\"381\">CRA pipe<\/strong>, <strong data-start=\"383\" data-end=\"395\">CRA clad<\/strong>, <strong data-start=\"397\" data-end=\"414\">CRA clad pipe<\/strong> (sometimes typed as <strong data-start=\"435\" data-end=\"448\">cra clad.<\/strong>) and CRA lined \/ overlay solutions, depending on how the CRA is applied.<\/p>\n<p>Solid CRA lined pipes or CRA clad (cladding) pipes are known as bimetal pipe that consist of an inner alloy pipe for corrosion-resistance and an outer carbon steel pipe which can withstand external and internal pressure.<\/p>\n<p><iframe loading=\"lazy\" title=\"Cladding Pipe Fittings: Automated Weld Overlay\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/UXmksK_xKUk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p data-start=\"251\" data-end=\"924\">In highly aggressive media such as sour gas, H\u2082S, CO\u2082, chloride brines, and saline water reinjection systems, standard carbon steel pipelines often fail prematurely due to corrosion. <strong data-start=\"434\" data-end=\"505\">CRA (Corrosion-Resistant Alloy) clad, lined, and weld overlay pipes<\/strong> provide a robust solution by combining the structural strength of carbon steel with a corrosion-resistant layer or liner of higher-performance alloys. These <strong data-start=\"663\" data-end=\"683\">bimetallic pipes<\/strong> consist of an <strong data-start=\"698\" data-end=\"717\">inner CRA layer<\/strong> (e.g., stainless steel 316L, Inconel 625, alloy 825, duplex alloys) welded or bonded to a <strong data-start=\"808\" data-end=\"834\">carbon steel base pipe<\/strong> (e.g., API 5L, ASTM A106\/A53, ASTM A333 Grade 6).<\/p>\n<ul data-start=\"926\" data-end=\"1552\">\n<li data-start=\"926\" data-end=\"1130\">\n<p data-start=\"928\" data-end=\"1130\">In a <strong data-start=\"933\" data-end=\"955\">clad configuration<\/strong>, the CRA alloy is metallurgically bonded to the carbon steel via methods such as <strong data-start=\"1037\" data-end=\"1089\">explosive bonding, roll bonding, or weld overlay<\/strong>.<\/p>\n<\/li>\n<li data-start=\"1131\" data-end=\"1374\">\n<p data-start=\"1133\" data-end=\"1374\">In a <strong data-start=\"1138\" data-end=\"1161\">lined configuration<\/strong>, the CRA alloy pipe is mechanically expanded, press-fitted, or bonded inside the carbon steel backing pipe using full-length expanders, hydroforming, or similar techniques.<\/p>\n<\/li>\n<li data-start=\"1375\" data-end=\"1552\">\n<p data-start=\"1377\" data-end=\"1552\"><strong data-start=\"1377\" data-end=\"1397\">CRA weld overlay<\/strong> uses alloy welding rods to deposit a corrosion-resistant layer onto the internal surface of the carbon steel pipe.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1554\" data-end=\"2093\">These composite pipes are widely used in applications such as <strong data-start=\"1616\" data-end=\"1706\">water injection pipelines, interfield flowlines, riser pipelines, and subsea flowlines<\/strong>, where long-term resistance to internal corrosion is critical. Octal Steel supplies CRA clad and lined pipes, fittings, and flanges with <strong data-start=\"1882\" data-end=\"1923\">outer diameters from 6\u2033 to 60\u2033 (clad)<\/strong> and <strong data-start=\"1928\" data-end=\"1951\">1\/2\u2033 to 24\u2033 (lined)<\/strong>, CRA thickness up to <strong data-start=\"1973\" data-end=\"1982\">80 mm<\/strong> (clad) and 7\u201335 mm (lined), and maximum lengths up to <strong data-start=\"2037\" data-end=\"2052\">12.3 meters<\/strong>.<\/p>\n<p data-start=\"1554\" data-end=\"2093\"><strong data-start=\"2403\" data-end=\"2450\">Where CRA composite pipes fit in the field:<\/strong> CRA composite pipe selection typically anchors on internal medium severity (CO\u2082\/H\u2082S\/chlorides), operating temperature, pressure, and expected service life. CRA clad, lined, and overlay solutions are commonly specified when solid CRA pipe cost is not justified across the full line length, but internal corrosion risk remains non-negotiable.<\/p>\n<p><a href=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/08\/pipe-cladding.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-3949\" src=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/08\/pipe-cladding.jpg\" alt=\"how to do pipe cladding\" width=\"800\" height=\"400\" srcset=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/08\/pipe-cladding.jpg 800w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/08\/pipe-cladding-300x150.jpg 300w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/08\/pipe-cladding-768x384.jpg 768w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/08\/pipe-cladding-280x140.jpg 280w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<h2>how to do pipe cladding<\/h2>\n<p>Bonding and cladding processes for CRA cladding and lined pipe.<\/p>\n<p><strong data-start=\"2896\" data-end=\"2943\">Clad pipe manufacturing process (overview):<\/strong> The \u201cpipe cladding\u201d scope usually covers (1) selecting the CRA layer \/ liner material, (2) bonding the CRA to the carbon steel backing pipe (metallurgical bond, mechanical bond, or weld overlay), (3) welding and dimensional control, and (4) inspection and documentation closure aligned to the specified standard and project acceptance package.<\/p>\n<p>Normally, the mother pipe in carbon steel is of API 5L B to X70, ASTM A53B, or A106B. Clad or lined is with alloy steel of 316L or Inconel alloy 625 \/ Inconel 625 \/ UNS N06625, alloy 825, UNS31803, UNS 31254.<\/p>\n<p><a href=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-4814\" src=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined.jpg\" alt=\"CRA Clad and Lined pipe API 5L X65 with 316L\" width=\"598\" height=\"350\" srcset=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined.jpg 598w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined-300x176.jpg 300w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined-280x164.jpg 280w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><\/a><\/p>\n<p>CRA Clad and Lined pipe API 5L X65 with 316L<\/p>\n<p>Pipes made from CRA (Corrosion-Resistant Alloy) materials have a wide range of applications. These include subsea pipelines used for transporting sour gas and oil, saltwater pipelines, water reinjection systems, process pipes in the chemical industry, saltwater pipes, and many others.<br \/>\nThese CRA lined and clad steel pipes are majorly used as:<\/p>\n<p><strong>-Water injection pipelines<\/strong><br \/>\nUsed to move treated or filtered seawater \/ produced water from pumps to injection wells at sustained pressure, where oxygen residuals, chlorides, and biocide chemistry can accelerate corrosion in carbon steel. CRA clad or lined construction is selected to keep the internal wetted surface corrosion-resistant while retaining the pressure capacity of the carbon steel backing pipe, especially in long injection headers and trunk lines.<br \/>\n<strong>-Inter-field pipelines<\/strong><br \/>\nApplied on tie-in lines between wells, manifolds, and processing facilities that carry multiphase flow (oil, gas, produced water) with CO\u2082 and, in many fields, H\u2082S. These lines often see variable flow regimes and water cut increases over time, which drives localized corrosion risk. CRA composite pipes are used to maintain internal corrosion resistance without using solid CRA pipe across the entire interfield network.<br \/>\n<strong>-Riser pipelines<\/strong><br \/>\nUsed as production or injection risers where internal corrosion resistance must be maintained under combined mechanical loading and aggressive media. Riser service typically demands stable internal surface protection over long operating periods, and CRA lined\/clad options are commonly applied to manage corrosion risk while keeping the structural role on the carbon steel side.<br \/>\n<strong>-Flow-lines<\/strong><br \/>\nUsed for production flow-lines that transport corrosive fluids from wells to manifolds or processing units, including wet gas, sour service, or high-chloride produced water. CRA clad\/lined pipes are specified when the corrosion mechanism is dominated by internal exposure and long-term integrity depends on maintaining a continuous CRA barrier on the wetted surface, while the base pipe provides the primary load-bearing section.<\/p>\n<p>Octal offers high quality CRA clad and lined pipe.<\/p>\n<p><strong data-start=\"4029\" data-end=\"4086\">Acceptance-facing definition (engineer + inspection):<\/strong> In CRA composite piping, \u201chigh quality\u201d is demonstrated through controlled bonding quality, overlay chemistry \/ thickness consistency (where applicable), dimensional conformity, and a documentation set that ties heat numbers and inspection results to each pipe \/ spool.<\/p>\n<h2>Mechanical bonding<\/h2>\n<p><a href=\"https:\/\/www.octalsteel.com\/product\/cra-clad-and-lined-pipe\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-77\" src=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/11\/cra-cladding-lined-pipe.jpg\" alt=\"\" width=\"full\" height=\"full\" \/><\/a><\/p>\n<p>Mechanical bonding method is to use an expanding machine to expand the inner alloy pipe to outer carbon steel pipe.<\/p>\n<p><strong data-start=\"4508\" data-end=\"4545\">Mechanical bond acceptance focus:<\/strong> Mechanical bonding performance is typically demonstrated through stable contact along the full interface length, controlled ovality\/roundness, and repeatable bonding results by process control (expander die position control or hydroforming controls), aligned to the specified lined-pipe standard and project requirements.<\/p>\n<h2>CRA Overlay \/ Weld Overlay<\/h2>\n<p><a href=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-weld-overlay-clad.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-4813\" src=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-weld-overlay-clad.jpg\" alt=\"CRA weld overlay methods\" width=\"609\" height=\"465\" srcset=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-weld-overlay-clad.jpg 609w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-weld-overlay-clad-300x229.jpg 300w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-weld-overlay-clad-223x170.jpg 223w\" sizes=\"(max-width: 609px) 100vw, 609px\" \/><\/a><\/p>\n<h3>CRA weld overlay methods<\/h3>\n<p>CRA Weld overlay Pipe involves the use of an alloy welding rod (cladding material) to weld an overlay onto the internal surface of a carbon steel pipe. This overlay essentially serves to overwrite the alloy steel onto the carbon steel pipe.<\/p>\n<p><strong data-start=\"5187\" data-end=\"5236\">Clad pipe welding (overlay) acceptance focus:<\/strong> Weld overlay performance is typically evaluated by overlay thickness uniformity, continuity (no exposed carbon steel at the wetted surface), chemistry\/dilution control, and agreed NDT scope. For critical service, overlay mapping and inspection records are commonly used to close acceptance and handover.<\/p>\n<h2>Methods of Bonding CRA material to carbon steel pipe<\/h2>\n<p>In terms of bonding the CRA material to carbon steel, there are two methods to go about it:<\/p>\n<p>1. Metallurgical bond (for CRA Clad Pipes) \u2013 Cladding of plates (metallurgical bond between two different metals) can be carried out by various operations such as coextrusion, hot rolling, explosive bonding or weld overlay. However, one of the major challenges with metallurgical bonding is the high cost associated with it. This is mainly due to the limited number of suppliers who can perform the complex and demanding manufacturing process required for metallurgical bonding of the plates.<\/p>\n<p>2. Mechanical bond (for CRA Lined pipes) \u2013 Mechanical bonding the CRA pipe and the backing steel pipe by using spring back variation which can be achieved by means of Hydroforming or full-length pipe expander.<\/p>\n<p>3. CRA Weld Overlay.<\/p>\n<p><a href=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/CRA-clad-pipe-welding-overlay-alloy-material.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-4843\" src=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/CRA-clad-pipe-welding-overlay-alloy-material.jpg\" alt=\"\" width=\"617\" height=\"463\" srcset=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/CRA-clad-pipe-welding-overlay-alloy-material.jpg 800w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/CRA-clad-pipe-welding-overlay-alloy-material-300x225.jpg 300w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/CRA-clad-pipe-welding-overlay-alloy-material-768x576.jpg 768w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/CRA-clad-pipe-welding-overlay-alloy-material-227x170.jpg 227w\" sizes=\"(max-width: 617px) 100vw, 617px\" \/><\/a><\/p>\n<p><strong data-start=\"6429\" data-end=\"6458\">Supplier capability note:<\/strong> When projects compare <strong data-start=\"6481\" data-end=\"6508\">clad pipe manufacturers<\/strong> (sometimes misspelled in searches as <strong data-start=\"6546\" data-end=\"6573\">cald pipe manufacturers<\/strong>), practical differentiators are process route capability (clad \/ lined \/ overlay), size range, CRA thickness control, repeatable bonding results, and completeness of inspection documentation for acceptance.<\/p>\n<h2>Pipe Cladding Key Process<\/h2>\n<p>The key process in cladding (clad) pipe production involves the use of metallurgical methods such as weld overlay or co-extrusion for bonding. The first step is to clad the CRA (Corrosion-Resistant Alloy) material onto a steel plate. Then, the cladding steel plate is formed into a pipe shape and welded to complete the clad pipe.<\/p>\n<p><strong data-start=\"7154\" data-end=\"7203\">Clad pipe manufacturing process (step chain):<\/strong> CRA plate \/ layer preparation \u2192 bonding to backing steel (clad \/ overlay) \u2192 forming \u2192 seam welding \u2192 dimensional control \u2192 NDT \u2192 final inspection and documentation closure. This step chain is often used to define scope and acceptance points on clad projects.<\/p>\n<h3>Using CRA plate to make the pipe<\/h3>\n<p data-start=\"7511\" data-end=\"7546\">CRA clad lined pipe process bimetal<\/p>\n<p data-start=\"7548\" data-end=\"7841\"><strong data-start=\"7548\" data-end=\"7581\">Clad pipe material alignment:<\/strong> CRA plate (or deposited overlay metal) selection is normally driven by corrosive mechanism (CO\u2082\/H\u2082S\/chlorides), operating temperature, flow regime, and required design life, with the backing steel selected to satisfy pressure containment and structural needs.<\/p>\n<p><a href=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-lined-pipe-process-bimetal.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-4815\" src=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-lined-pipe-process-bimetal.jpg\" alt=\"CRA clad lined pipe process bimetal\" width=\"800\" height=\"652\" srcset=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-lined-pipe-process-bimetal.jpg 800w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-lined-pipe-process-bimetal-300x245.jpg 300w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-lined-pipe-process-bimetal-768x626.jpg 768w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-lined-pipe-process-bimetal-209x170.jpg 209w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<h2>Bonding Process of CRA lined pipes<\/h2>\n<p>To bond CRA lined pipes using a Full-Length Pipe Expander, the outer and inner pipe are aligned in a telescopic manner. They are then positioned on the outfeed and infeed loading cart respectively. The pipe is gradually fed using the loading cart over the expanding head.<br \/>\nIn order to achieve consistent mechanical bonding between the outer and inner pipe across the entire contact area, a specialized expander head design is utilized. The Full-Length Pipe Expander is equipped with a linear transducer that precisely measures the position of the dies. This allows for the attainment of the optimal point in mechanical bonding for each combination of outer and inner pipe materials.<\/p>\n<p>CRA Clad and Lined pipe API 5L X65 with 316L<\/p>\n<p><strong data-start=\"8623\" data-end=\"8649\">Field-fit implication:<\/strong> Controlled expansion and calibration support predictable roundness and interface contact, which matters for spool fit-up, welding alignment, and downstream inspection acceptance\u2014especially where dimensional tolerances and internal liner integrity are inspected.<\/p>\n<p><a href=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-4814\" src=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined.jpg\" alt=\"CRA Clad and Lined pipe API 5L X65 with 316L\" width=\"598\" height=\"350\" srcset=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined.jpg 598w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined-300x176.jpg 300w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined-280x164.jpg 280w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><\/a><\/p>\n<h3>Full-Length Pipe Expander vs Hydroforming Machine for CRA Lined Pipe<\/h3>\n<p>Some manufacturers utilize Hydroforming machines for bonding operations. However, when comparing the Full-Length Pipe Expander to the Hydroforming machine, it becomes evident that the latter is more expensive. Additionally, the Hydroforming machine has costly tooling and often results in material waste due to the seals used on the pipe ends.<\/p>\n<p>Companies like Fontijne Grotnes offer a more economical and controlled solution in the form of the Full-Length Pipe Expander. This equipment allows for optimum mechanical bonding between the outer and inner pipe combinations. The process is facilitated by diameter position control, eliminating the need for expensive outer dies.<\/p>\n<p>This process guarantees a constant production process according to API 5L through:<br \/>\n-Improving mechanical properties by exceeding its material yield strength<br \/>\n-Stress relief of material in way of the weld zone<br \/>\n-Pipe weld steam testing<br \/>\n-Pipe straightening<br \/>\n-Pipe calibration over its full length in diameter and roundness<\/p>\n<h2>Market Growth for cladding and lined pipe<\/h2>\n<div class=\"msg-content  MuiBox-root css-1b7slh2\">\n<p>The demand for CRA clad and lined pipes is increasing due to the anticipated rise in corrosive conditions. This is primarily driven by the higher water cuts and concentrations of carbon dioxide and hydrogen sulfide in produced fluids. Additionally, these corrosive products often need to be transported over long distances, at higher pressures, and in an environmentally friendly manner.<\/p>\n<\/div>\n<h2>Inconel Alloy 625 Weld Overlay \/ Alloy 625 Clad Pipe and Lined Pipe<\/h2>\n<p>Inconel alloy 625, which is a Ni-Cr based material, has been proven to possess high corrosion resistance in a wide range of environments, including marine, aerospace, chemical plants, and petrochemical industries. It exhibits exceptional resistance to various highly corrosive environments and offers advanced mechanical properties at both low and high temperatures.<\/p>\n<p>Cladding or lining the inside of a carbon steel pipe with Inconel alloy 625 material has become a popular solution for addressing corrosive issues and achieving significant cost savings.<\/p>\n<p><strong data-start=\"11399\" data-end=\"11430\">Clad pipe material mapping:<\/strong> Alloy 625 is frequently selected for aggressive internal corrosion environments where chloride exposure, sour conditions, and elevated temperature combine, and where long-term internal corrosion resistance is required without the cost of full solid CRA pipe.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large wp-image-6327\" src=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined-pipe-market-1024x335.jpg\" alt=\"\" width=\"1024\" height=\"335\" srcset=\"https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined-pipe-market-1024x335.jpg 1024w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined-pipe-market-300x98.jpg 300w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined-pipe-market-768x251.jpg 768w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined-pipe-market-1536x503.jpg 1536w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined-pipe-market-2048x671.jpg 2048w, https:\/\/www.octalsteel.com\/wp-content\/uploads\/2017\/07\/cra-clad-and-lined-pipe-market-280x92.jpg 280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<h3>Our Supplied Range (Structured Table)<\/h3>\n<table style=\"width: 100%; border-collapse: collapse; border: 2px solid #000; font-family: Arial, Helvetica, sans-serif; font-size: 14px;\">\n<thead>\n<tr>\n<th style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle; font-weight: bold;\">Item<\/th>\n<th style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle; font-weight: bold;\">Details<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Supply scope<\/td>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">CRA Clad and Lined pipes, Fittings, Flanges<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Clad \/ lined standard<\/td>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">API 5LD, API 5LC<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Outer Diameter (cladding pipe)<\/td>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">6\u201d to 60\u201d<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">OD range (CRA lined pipe)<\/td>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">1\/2\u201d to 24\u201d<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Thickness<\/td>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Up to 80 mm (Clad pipe), 7 mm to 35 mm (For lined pipe)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Maximum length<\/td>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">12.3 meter<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Backing steel pipe (mother pipe) material<\/td>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Carbon Steel Pipe, C-Mn Steel Pipe, API 5L B, X42, X46, X52, X56, X60, X65, X70, X80 PSL1, PSL2 and SOUR NACE MR0175, ASTM A106 B, ASTM A333 Grade 6, etc.<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">CRA Clad Pipe Fittings<\/td>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Elbow, Cap, Tee, Reducer in ASME B16.9, Material in ASTM A234WPB, WPC, ASTM A420 WPL6.<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">CRA Clad Flange<\/td>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Welding Neck Flange, Slip On Flange in ASME B16.5, B16.47 A\/B, Material in ASTM A105, A350.<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Cladding and Lining CRA material<\/td>\n<td style=\"border: 2px solid #000; padding: 10px; text-align: center; vertical-align: middle;\">Austenitic stainless steel, nickel alloy steel, Hastelloy C276, Inconel Alloy 625 (Inconel 625 weld overlay), 825, S31803, S31254, titanium alloy steel, duplex steel, and etc.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 data-start=\"2136\" data-end=\"2196\"><\/h3>\n<h3 data-start=\"2136\" data-end=\"2196\">Clad Pipe Insulation vs CRA Cladding (Insulation Cladding \/ Aluminum Cladding)<\/h3>\n<p data-start=\"16401\" data-end=\"16467\">The word \u201ccladding\u201d is used in two different engineering contexts:<br \/>\n<strong>CRA cladding \/ CRA lined \/ weld overlay (CRA pipe scope):<\/strong> internal corrosion protection achieved by CRA layers, liners, or overlays bonded to a carbon steel backing pipe.<br \/>\n<strong>Clad pipe insulation \/ metal clad pipe insulation (insulation cladding scope):<\/strong> external thermal insulation protected by metal jacketing, often called aluminum cladding or stainless steel jacketing.<br \/>\nIn piping specifications, clad pipe insulation refers to the insulation system outside the pipe, while CRA cladding refers to the corrosion-resistant layer inside the pipe<\/p>\n<h3 data-start=\"17038\" data-end=\"17125\">How to Install Pipe Insulation (Metal Jacketing \/ Insulation Cladding Sequence)<\/h3>\n<p data-start=\"17127\" data-end=\"17696\">The phrase <strong data-start=\"17138\" data-end=\"17172\">how to install pipe insulation<\/strong> typically refers to the standard insulation cladding sequence used on industrial piping: insulation sections installed and jointed over the pipe, followed by metal jacketing installation (often <strong data-start=\"17367\" data-end=\"17388\">aluminum cladding<\/strong>), controlled overlap direction and fastening, sealing of seams to limit water ingress, and inspection of terminations and penetrations to maintain a continuous protective jacket. This sequence is commonly specified for <strong data-start=\"17608\" data-end=\"17638\">metal clad pipe insulation<\/strong> systems exposed to weather, splash, or mechanical damage.<\/p>\n<h3 data-start=\"2136\" data-end=\"2196\">Engineered Corrosion Protection for Critical Pipelines<\/h3>\n<p data-start=\"2198\" data-end=\"2586\">CRA clad, lined, and weld overlay pipes offer engineered solutions for pipeline systems where corrosion resistance is non-negotiable. By integrating a durable alloy layer with a structural carbon steel base, these bimetallic pipes deliver both <strong data-start=\"2442\" data-end=\"2465\">mechanical strength<\/strong> and <strong data-start=\"2470\" data-end=\"2493\">chemical durability<\/strong>, even under severe service conditions such as sour gas, high CO\u2082, or chloride-laden flows.<\/p>\n<p data-start=\"2588\" data-end=\"3122\">Octal Steel provides a full portfolio of CRA clad &amp; lined solutions, including matching <strong data-start=\"2676\" data-end=\"2698\">clad pipe fittings<\/strong>, <strong data-start=\"2700\" data-end=\"2711\">flanges<\/strong>, and full documentation (MTC, NDT reports, bond strength certificates) for major standards like <strong data-start=\"2808\" data-end=\"2828\">API 5LD, API 5LC<\/strong>, and <strong data-start=\"2834\" data-end=\"2847\">ASME\/ASTM<\/strong> codes. Whether your project demands <strong data-start=\"2884\" data-end=\"2934\">high-performance internal corrosion resistance<\/strong> or <strong data-start=\"2938\" data-end=\"2975\">cost-effective structural support<\/strong>, choosing Octal Steel\u2019s CRA clad &amp; lined pipe systems ensures long-term reliability and integrated protection across critical pipeline networks.<\/p>\n<h2 data-start=\"2588\" data-end=\"3122\">FAQ<\/h2>\n<p data-start=\"0\" data-end=\"354\">Q1: What is clad pipe and what is the clad pipe meaning in CRA projects?<br data-start=\"72\" data-end=\"75\" \/>A1: A clad pipe is a bimetal pipe combining a carbon steel backing pipe with a corrosion-resistant alloy layer or liner on the wetted surface; clad pipe meaning in CRA projects refers to internal corrosion protection achieved by CRA clad, CRA lined, or weld overlay construction.<\/p>\n<p data-start=\"356\" data-end=\"727\">Q2: What is the difference between CRA clad pipe, CRA lined pipe, and CRA weld overlay?<br data-start=\"443\" data-end=\"446\" \/>A2: CRA clad pipe uses a metallurgical bond between the CRA layer and carbon steel; CRA lined pipe uses mechanical bonding by expansion or hydroforming of a CRA liner inside the backing pipe; CRA weld overlay deposits an alloy layer by controlled welding onto the internal surface.<\/p>\n<p data-start=\"729\" data-end=\"1067\">Q3: What are typical clad pipe material options for the CRA layer or liner?<br data-start=\"804\" data-end=\"807\" \/>A3: Common clad pipe material selections include stainless steel 316L, nickel alloys such as Inconel Alloy 625 (UNS N06625) and Alloy 825, and duplex \/ high-alloy stainless grades, paired with carbon steel mother pipes such as API 5L or ASTM carbon steel pipe.<\/p>\n<p data-start=\"1069\" data-end=\"1450\">Q4: What is clad pipe insulation and how does it relate to insulation cladding or aluminum cladding?<br data-start=\"1169\" data-end=\"1172\" \/>A4: Clad pipe insulation refers to external thermal insulation protected by metal jacketing; insulation cladding or aluminum cladding describes the metal jacket over the insulation, which is a different engineering scope from CRA internal cladding used for corrosion protection.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is clad pipe In CRA service, clad pipe meaning refers to a bimetal (bimetallic) pipe construction that combines a carbon steel backing pipe for strength with a corrosion-resistant alloy layer or liner on the wetted surface for corrosion protection. In project language, this is often written as CRA pipe, CRA clad, CRA clad pipe [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":4820,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[309,304],"_links":{"self":[{"href":"https:\/\/www.octalsteel.com\/wp-json\/wp\/v2\/posts\/3882"}],"collection":[{"href":"https:\/\/www.octalsteel.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.octalsteel.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.octalsteel.com\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.octalsteel.com\/wp-json\/wp\/v2\/comments?post=3882"}],"version-history":[{"count":31,"href":"https:\/\/www.octalsteel.com\/wp-json\/wp\/v2\/posts\/3882\/revisions"}],"predecessor-version":[{"id":6613,"href":"https:\/\/www.octalsteel.com\/wp-json\/wp\/v2\/posts\/3882\/revisions\/6613"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.octalsteel.com\/wp-json\/wp\/v2\/media\/4820"}],"wp:attachment":[{"href":"https:\/\/www.octalsteel.com\/wp-json\/wp\/v2\/media?parent=3882"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.octalsteel.com\/wp-json\/wp\/v2\/categories?post=3882"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.octalsteel.com\/wp-json\/wp\/v2\/tags?post=3882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}