Flanged pipe caps belong to flanged pipe plugging fittings. They are connected to pipeline flanges by bolts and do not require on-site welding or cutting. They can be used for both permanent plugging and temporary plugging and pressure test isolation. During later maintenance, capacity expansion, or tapping, the bolts can be directly removed. Products can be processed by forging, hot pressing, or casting processes, and comply with standards such as GB/T, HG/T, 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~PN100 and American standard Class150~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.
Overview
A flange pipe cap is a flanged pipeline plugging fitting, with a flange plate at one end and a closed head structure at the other end. During installation, it is connected to the pipeline flange with bolts, requiring no on-site welding or cutting; during maintenance, the pipeline can be opened simply by removing the bolts. It can be used for permanent sealing of pipeline ends, temporary plugging of reserved interfaces, sealing protection of equipment ports, and is also suitable for pressure test sealing and system zoning isolation. Products can be processed by forging, hot pressing, or casting processes, and comply with standards such as GB/T, HG/T, ASME B16.5, etc. The diameter range covers DN15-DN1200, materials include carbon steel, stainless steel, alloy steel, and ductile iron, pressure ratings cover national standard PN6~PN100 and American standard Class150~Class1500, and sealing surfaces can be RF, MFM, TG, or RJ.
Key Features
First, weld-free quick installation. Flange pipe caps are connected to pipeline flanges with bolts, requiring no hot work welding on site, and no cutting or grinding, reducing construction steps and hidden leakage risks from welds. Second, repeatable disassembly and assembly. During later pipeline capacity expansion, maintenance, or opening modification, the pipeline can be opened simply by removing the bolts, making it more flexible than welded pipe caps. Third, dual use for permanent and temporary purposes. It can serve as permanent sealing for pipeline ends, and can also be used for temporary plugging, pressure test isolation, and sealing of reserved openings. Fourth, wide specification coverage. Diameters range from DN15 to DN1200, and materials, pressure ratings, and sealing surface forms can be selected according to project requirements. Fifth, customization is supported. For non-standard sizes, special materials, special sealing surfaces, surface treatment, and marking requirements, please contact us for confirmation.
Applications
Flange pipe caps are suitable for sealing various pipeline ends, closing reserved openings, and protecting equipment ports. Civil scenarios include end sealing of building water supply and drainage pipelines, closing reserved openings of central air conditioning HVAC pipelines, end plugging of building fire protection pipe networks, and sealing protection of idle interfaces of equipment in machine rooms. Municipal scenarios include end plugging of urban water supply main and branch pipes, sealing of municipal heating pipe networks, final closure of rainwater and sewage pipe networks, and pressure test isolation plugging of municipal pipelines. Industrial scenarios include port sealing of chemical process pipelines, plugging of power plant circulating water pipe networks, end sealing of sewage treatment pipelines, and plugging of oil and gas transmission pipelines. For pipe openings requiring repeated disassembly and assembly or later modification, flange pipe caps are easier to operate than welded seals.
Specifications
Flange pipe caps cover diameters DN15-DN1200, and materials include carbon steel, stainless steel, alloy steel, and ductile iron. Pressure ratings are PN6~PN100 for the national standard and Class150~Class1500 for the American standard. Sealing surfaces can be RF raised face, MFM male and female face, TG tongue and groove face, or RJ ring joint face. Products comply with standards such as GB/T, HG/T, ASME B16.5, etc., and can be processed by forging, hot pressing, or casting. Regular in-stock standard specifications support a minimum order of 1 piece, including PN16 and PN25 regular pressures, and common diameters in carbon steel and 304 stainless steel. For non-standard diameters, special wall thicknesses, special-shaped heads, special materials, special sealing surfaces, surface treatment, and marking requirements, please contact us to confirm the specific configuration.
Procurement & Delivery
We adopt a flexible minimum order mechanism. Regular in-stock standard specifications support a minimum order of 1 piece, suitable for sample submission for inspection, sporadic repairs, small-order replenishment, and project centralized procurement. The warehouse regularly stocks flange pipe caps in PN10, PN16, and PN25 regular pressures, and common diameters in carbon steel and 304 stainless steel. Orders are shipped within 24 hours after confirmation. For non-standard customized orders, the delivery time is confirmed according to project requirements. In terms of packaging, small-diameter products are wrapped in independent bubble film and packed in hard cardboard boxes; medium-diameter products are reinforced with multi-layer stretch film; large-diameter heavy-duty pipe caps are fixed on solid wood pallets, secured with steel straps, and fully wrapped in waterproof film. Flange sealing surfaces are uniformly affixed with thickened wear-resistant protective rubber pads, carbon steel pipe caps are sprayed with anti-rust oil, and stainless steel pipe caps undergo anti-oxidation isolation treatment. The outer packaging is marked with specifications, diameter, material, pressure rating, applicable standard, and production batch. Support is available for export fumigation wooden pallets, waterproof and moisture-proof packaging, and customized shipping marks.
Service & Support
We provide full-process support for flanged pipe caps before, during, and after sales. Before sales, we can assist with pipeline network plugging condition selection, pressure matching, parameter verification, drawing adaptation, and budget quotation. During sales, we synchronize production, quality inspection, and shipping progress. After sales, we provide installation guidance and technical troubleshooting answers. Before leaving the factory, the products undergo internal and external cleaning and deburring. Genuine products enjoy a 12-month official warranty. During the warranty period, for problems such as cracking, leakage, deformation, and seal failure caused by non-human impact or illegal overpressure use, we support free replacement, free reshipment, and bear the round-trip logistics costs. Unused standard products with intact packaging support seven-day no-reason return and exchange. After-sales issues are responded to within 2 hours, with a solution issued on the same day, and lifetime free technical consultation and selection support are provided.
FAQ
What is the difference between flange pipe caps and ordinary welded pipe caps?
Flanged pipe caps use a bolted butt-joint structure, do not require welding, can be repeatedly disassembled and reassembled, and facilitate later pipeline capacity expansion, maintenance, and opening modifications. Ordinary welded pipe caps are fixed by one-time welding, cannot be disassembled, and later modifications require cutting the pipeline. For pipe openings that need to retain maintenance conditions, flanged pipe caps offer greater engineering flexibility and reusability.
Which pipeline systems can flanged pipe caps be used in?
They can be used in pipeline systems such as water supply and drainage, fire protection and HVAC, chemical engineering, power plants, sewage treatment, and oil and gas transportation. They are suitable for pipeline end closure, reserved interface sealing, equipment port protection, pressure test closure, and system zoning isolation. For material, pressure rating, and sealing face selection under specific working conditions, please contact us for confirmation.
How should the material and pressure rating of flanged pipe caps be selected?
The material and pressure rating need to be determined according to the pipeline medium, temperature, pressure, and service environment. We provide materials such as carbon steel, stainless steel, alloy steel, and ductile iron, with pressure ratings covering national standard PN6 to PN100 and American standard Class150 to Class1500. You are welcome to provide pipeline diameter, medium, temperature, and pressure parameters, and we will assist in confirming the configuration.
What are the minimum order quantity and delivery time for flanged pipe caps?
Standard specifications in regular stock support a minimum order of 1 piece, including PN16 and PN25 conventional pressures, and common diameters in carbon steel and 304 stainless steel. The warehouse keeps regular stock, and shipment is made within 24 hours after order confirmation. For non-standard customized orders, the delivery time is confirmed according to project requirements. For foreign trade orders, production and shipment can be arranged to match the shipping schedule.
Are non-standard customization and export packaging for foreign trade supported?
Support customization requirements such as non-standard diameters, special wall thicknesses, special-shaped heads, special materials, special sealing surfaces, surface treatment, and laser marking. For foreign trade export, fumigated wooden pallets, waterproof and moisture-proof packaging, and custom shipping marks can be provided. Please provide specific dimensions, quantities, and technical requirements, and we will assist in confirming the solution and providing a quotation.
