Non-standard pipe cap
Non-standard pipe caps are produced for pipe openings that standard pipe fittings cannot cover. When pipelines are of obsolete or discontinued specifications, mixed with multiple standards, equipment interfaces have irregular structures, or working conditions involve high pressure, low temperature, or strong corrosion, conventional pipe caps often cannot be installed or provide reliable sealing. We perform modeling and machining according to drawings, physical samples, or on-site measured dimensions provided by customers, and can customize structures such as eccentric diameters, non-standard arc heights, unequal-length straight edges, irregular transition surfaces, and thickened or thinned wall thickness. Materials cover systems such as carbon steel, stainless steel, duplex steel, heat-resistant steel, and low-temperature alloy steel. The products are used for permanent sealing of irregular pipe openings, plugging of spare ports, partition isolation of multi-system pipe networks, and temporary sealing for pressure testing. Before purchasing, it is recommended to clarify the medium, pressure and temperature, interface dimensions, and installation space. Please contact us to confirm the specific configuration and quotation.
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Carbon Steel Pipe Cap
Carbon steel pipe caps are the sealing and plugging fittings with a relatively large usage volume in industrial piping systems. The main body material is low-carbon carbon steel, and commonly used grades include 20#, Q235B, Q345B, ASTM A234 WPB, ST35.8, STPG370, etc. The products are formed by integral hot-pressed seamless molding, steel plate rolled and welded molding, or forged precision machining molding. The pipe wall is dense and uniform, and the sealing performance is stable. They can adapt to working conditions from atmospheric pressure to ultra-high pressure, and from normal temperature to medium-high temperature. Specifications cover DN15–DN2000 full bore, adapt to wall thickness grades such as SCH10, SCH40, SCH80, SCH160, XXS, as well as pressure grades PN10–PN100, Class150–1500, 5K–40K. The implemented standards include GB/T12459, ASME B16.9, DIN2617, EN10253, JIS B2312, GOST17379. We supply to EPC engineering general contractors, oil and gas chemical infrastructure contractors, thermal power construction units, municipal gas construction teams, pressure vessel manufacturers, cross-border B2B traders, and pipeline supporting procurement enterprises, supporting batch procurement of standard specifications and non-standard customization.
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Low-temperature steel pipe cap
Low-temperature steel pipe caps are also called low-temperature heads or low-temperature pipe plugs. They are installed at the end of pipelines for closure, pressure test blind plugging, or isolation of spare pipe openings. Unlike ordinary carbon steel pipe caps, they use WPL6, 16MnDG, and Q345D/E low-temperature special base materials, and after stress relief heat treatment and low-temperature impact testing, they are not prone to cold brittle cracking under -46°C deep cryogenic working conditions. The products are manufactured according to ASME B16.9, GB/T12459, and ASTM A420 standards, covering DN15–DN1200, SCH20–XXS, Class150–Class900. Connection methods include butt welding, socket welding, and threading. Before leaving the factory, low-temperature impact testing, hydrostatic pressure testing, and non-destructive testing are performed, and material MTC, impact reports, and inspection reports are provided with the goods. Regular specifications have a minimum order quantity of 1 piece. Mainstream models of WPL6 and 16MnDG are in stock, and non-standard sizes, special wall thicknesses, and ultra-low-temperature process customization are also accepted.
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Stainless Steel Pipe Cap
The stainless steel pipe caps we produce are used for terminal sealing of industrial piping systems, and common names include stainless steel heads, pipe plugs, and end caps. The product materials cover 304, 304L, 316, 316L, 321, 310S, as well as 2205 and 2507 duplex stainless steel, and can correspond to standards such as GB/T12459, ASME B16.9, DIN2617, EN10253, JIS B2312, and GOST17379. Specifications range from DN15 to DN2000, 1/2″ to 48″, and the wall thickness systems include SCH10S, SCH40S, SCH80S, and SCH160S. Pressure ratings cover PN10–PN100, Class150–1500, and 5K–40K, and the operating temperature range is -196℃ to 700℃. Forming methods include seamless hot pressing, steel plate rolled and welded construction, and precision forging. Before purchasing, it is recommended to confirm the medium type, cleanliness level, temperature and pressure, required standards, and material, and we will assist in matching specifications and providing a quotation accordingly.
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Alloy Steel Pipe Cap
Alloy steel pipe caps, also known as heat-resistant alloy heads or high-pressure alloy plugs, are high-pressure and high-temperature plugging pipe fittings smelted and formed by adding alloying elements such as chromium, molybdenum, and vanadium on the basis of carbon steel. The products cover DN15–DN2000, 1/2″–48″ imperial inch diameters, wall thicknesses ranging from SCH40 to XXS, and pressure ratings covering Class300–Class2500 and PN63–PN160. Materials include 15CrMo, 12Cr1MoV, Cr5Mo, 10CrMo910, P11, P12, P22, P91 and other heat-resistant chromium-molybdenum alloy steels, and they comply with standards such as GB/T12459, ASME B16.9, and ASTM A234. The production processes are divided into seamless hot-pressed integrated forming, thick plate rolled and welded forming, and precision forging forming, followed by normalizing and tempering heat treatment to eliminate stress. They are mainly used for permanent end sealing, zoned isolation, and pressure test sealing of pipelines such as high-temperature steam main lines, boiler pipelines, thermal power generating units, and petrochemical hydrogenation units.
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Duplex Steel Pipe Cap
Duplex steel pipe caps adopt an austenitic plus ferritic duplex metallographic structure, with materials covering grades such as 2101, S31803, 2205 (S32205/F51), 2507 (S32750/F53), and S32760, and are subjected to solution annealing treatment. Specifications range from DN15 to DN2000, or 1/2″ to 48″ in imperial units, and can match SCH10S, SCH40S, SCH80S, and SCH160S wall thicknesses as well as PN10–PN100 and Class150–Class1500 pressure ratings, and comply with standards such as GB/T21832, ASTM A815, ASME SA815, EN, DIN, JIS, and GOST. They are mainly used for end capping, spare nozzle closure, and zone isolation of offshore platform pipelines, seawater desalination equipment, coastal chemical pipeline networks, sour oil and gas transportation, desulfurization and denitrification environmental protection equipment, and brine and salt chemical pipelines. Before procurement, it is recommended to confirm the chloride ion concentration of the medium, hydrogen sulfide content, acid-base environment, diameter, wall thickness, pressure rating, and the required material grade, and we will assist in matching solutions such as 2205 or 2507 accordingly.
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