THD threaded pipe cap
THD threaded pipe caps belong to forged threaded pipe fittings. THD means Threaded. They are connected by screwing the internal thread onto the external thread of the pipe, and are used for detachable sealing at the end of a pipeline. The products mainly comply with ASME B16.11 and GB/T14383 standards, and are formed by an integral die forging process. The specifications are mainly small diameters from DN6 to DN100. The pressure ratings cover 3000LB, 6000LB, and 9000LB American standard pound classes. Thread types include NPT American standard tapered pipe threads and BSPP/BSPT British standard pipe threads. Materials include A105 carbon steel, 304/316L stainless steel, heat-resistant alloy steel, duplex steel, etc. Compared with welded pipe caps, threaded connections require no hot work, can be freely disassembled and assembled, and can be reused, making them suitable for pipeline ports that require regular inspection, cleaning, or instrument maintenance. We can confirm specific specifications, materials, and thread systems according to project requirements. You are welcome to contact us for selection recommendations and quotations.
Learn More
Flange Pipe Cap
Flanged pipe caps belong to flanged pipeline plugging fittings. They are connected to pipeline flanges by bolts and do not require on-site welding or cutting. They can be used for permanent plugging as well as temporary plugging and pressure test isolation. During later maintenance, capacity expansion, or hot tapping, they can be removed simply by unbolting. The products can be processed by forging, hot pressing, or casting processes, and are manufactured to standards such as GB/T, HG/T, and ASME B16.5. The diameter range covers DN15-DN1200. Materials include carbon steel, stainless steel, alloy steel, and ductile iron. Pressure ratings cover national standard PN6 to PN100 and American standard Class150 to Class1500. Sealing surfaces can be selected as RF raised face, MFM male-female face, TG tongue-and-groove face, and RJ ring joint face. We can assist in confirming the configuration and providing a quotation according to the project's diameter, material, pressure rating, and sealing surface requirements.
Learn More
National Standard Pipe Cap
National standard pipe caps are used to close the ends of pipelines, block the flow of media, and prevent the entry of impurities and the leakage of media. The pipe caps we produce comply with GB/T12459-2017 Steel Butt-Welding Seamless Pipe Fittings and GB/T13401-2017 Steel Plate Butt-Welding Pipe Fittings. Material options include 20# carbon steel, Q235B, 16Mn low-alloy steel, and 304 and 316L stainless steel. Structural types include elliptical, dished, hemispherical, spherical, and flat-bottom pipe caps. The nominal diameter covers DN15 to DN1200, suitable for wall thickness grades from Sch10 to Sch160, and can meet pressure conditions from PN6 to PN100. The factory can supply from stock and can also slightly adjust the structure on the basis of the national standard. Supporting material certificates, nondestructive testing reports, and certificates of conformity are provided to meet the requirements of domestic engineering supervision and completion acceptance filing.
Learn More
American standard pipe cap
American standard pipe caps are pipe end closure fittings used in conjunction with ASME B36.10M carbon steel pipes and ASME B36.19M stainless steel pipes. Their main functions are to close pipe ends, block medium flow, and reserve spare pipe openings. They can also serve as temporary seals during pipeline hydrostatic testing to reduce impurities entering the pipeline. The products use NPS inch-based specifications, covering NPS 1/2″ to NPS 48″, with wall thicknesses including Sch10, Sch40, Sch80, Sch160, and SchXXS, and pressure ratings covering Class150 to Class1500. Materials are selected according to ASTM grades: carbon steel includes A234 WPB and A105, stainless steel includes A403 WP304 and WP316L, and alloy steel includes A234 WP11, WP22, and the A182 series. Structural forms include elliptical, dished, hemispherical, spherical, and flat bottom, and specific configurations can be confirmed according to project requirements.
Learn More
Russian standard pipe cap
Russian-standard pipe caps are a common fitting for closing the ends of Russian-standard pipeline systems. They comply with the GOST 17379-2001 standard for steel butt-welding pipe fittings and are used in conjunction with Russian-standard pipeline and flange systems such as GOST 17378 and GOST 17376. The products are used to close the end ports of pipelines, reserve spare pipe openings, and isolate the flow of media in pipelines, reducing impurity accumulation, medium leakage, and pipeline corrosion, and helping to maintain stable pressure in the pipeline system. Specifications adopt the Russian-standard DN nominal diameter system, covering DN15-DN1200, with wall thickness grades Sch10-Sch160 and pressure ratings PN10 to PN100. In terms of materials, carbon steel is mainly ST20, 09G2S low-temperature steel, and 16Mn; stainless steel is mainly 12X18H10T, 08X18H10, and 316L; and alloy steel can be adapted to special working conditions such as extreme cold and high pressure. Production processes include three types: integral hot-pressed seamless forming, steel plate rolled and welded forming, and forged precision-machined forming. We supply to customers such as engineering general contractors, EPC contractors, oil and gas energy developers, and cross-border B2B traders in Russian-speaking regions, and can confirm specific specifications, materials, and delivery arrangements according to project requirements.
Learn More
European standard pipe cap
European standard pipe caps are used to close EN standard pipeline ports, reserve spare connections, provide temporary sealing for pressure testing, and isolate pipeline media, preventing medium leakage, impurity deposition, and inner wall corrosion. The products are manufactured according to EN 10253-1, EN 10253-2, and EN 10253-4, and are divided into Type A reduced-pressure type and Type B full-pressure type, and can be matched and connected with EN standard steel pipes, flanges, elbows, and tees. The production processes include integral hot-pressed seamless forming, steel plate rolled and welded forming, and forged precision-machined forming. Nominal diameter DN15–DN1200, wall thickness covers SCH10–SCH160 and XXS, pressure rating PN10–PN100. Carbon steel working temperature -20°C to 480°C, stainless steel -196°C to 650°C. We can assist in confirming the model and grade according to the medium, temperature, corrosive environment, and pressure-bearing requirements.
Learn More
German standard pipe cap
German standard pipe caps are used to close pipeline ports, reserve spare nozzles, and provide temporary sealing during hydrostatic pressure testing, blocking the flow of media within the pipeline and preventing media leakage, impurity accumulation, and inner wall corrosion. The product is simultaneously compatible with the traditional DIN 2617 German standard and the current DIN EN 10253 German standard, and is divided into Type A reduced-pressure type and Type B full-pressure type, with nominal diameters covering DN15-DN1200, wall thicknesses including SCH10 to SCH160 and the XXS thickened series, and pressure ratings from PN10 to PN100. The materials adopt German standard grades: carbon steel includes ST35.8, ST52, and C22.8; stainless steel includes 1.4301, 1.4404, and 1.4571; alloy steel includes 13CrMo44 and 16Mo3. The production processes include integral hot-pressed seamless forming, steel plate rolled and welded forming, and forged precision finishing forming. We can assist in confirming the material, grade, and diameter configuration according to project operating conditions.
Learn More
British Standard Pipe Cap
British standard pipe caps are used for end closure and temporary sealing of British standard piping systems, suitable for projects in the United Kingdom and the Commonwealth, Southeast Asia, the Middle East, Africa, and other regions that implement the BS system. The products are manufactured according to BS EN 10253-1/2/4, BS 3799, and BS 1740, and are available in both imperial inch sizes and metric DN specifications, making it convenient to mix old and new British standard pipelines and to renovate old overseas projects. Structurally, they are divided into Type A reduced-pressure type and Type B full-pressure type: the former is mostly used for low-pressure municipal, water supply and drainage, and HVAC networks, while the latter is used for high-pressure process pipelines in power stations, refining and chemical plants, oil and gas, and other industries. Forming processes include seamless hot pressing, steel plate rolling and welding, and forged finishing, covering SCH10-SCH160, XXS wall thicknesses, as well as PN10-PN100 and Class150-1500 pressure ratings. In terms of materials, carbon steel can withstand -20°C to 480°C, stainless steel can withstand -196°C to 650°C, and options such as heat-resistant alloy steel can be confirmed according to project requirements. Before purchasing, it is recommended to clarify the applicable standard, Type A or Type B grade, nominal diameter and inch size, wall thickness, pressure rating, material, and surface treatment requirements, and we will assist in confirming the model and quotation accordingly.
Learn More
Japanese Standard Pipe Cap
The Japanese standard pipe caps we produce comply with JIS B2311, JIS B2312, and JIS B2313 standards, adopt the dual specification system of A nominal and B nominal, and are used for permanent sealing of pipe ends, sealing of spare pipe openings, partition isolation of pipe networks, and temporary sealing for hydrostatic pressure testing. Pressure ratings cover 5K, 10K, 20K, 30K, and 40K, specifications range from 15A to 1200A, and wall thicknesses cover SCH10 to SCH160 as well as the XXS thickened series. Materials include carbon steel SS400 and STPG370, stainless steel SUS304 and SUS316L, and heat-resistant steel STPA24 and STPA26. Production processes include seamless hot pressing, steel plate rolled and welded fabrication, and forged finishing. The products serve projects such as Japanese-system energy power stations, chemical refining, food and pharmaceutical, shipbuilding, HVAC and thermal power, and pressure vessels, and specific configurations can be confirmed and quoted according to project requirements.
Learn More