Flat Cap
A flat-bottom pipe cap is a specialized sealing pipe fitting for industrial low-pressure piping systems. Its core purpose is permanent or temporary sealing operations for various atmospheric-pressure and low-pressure pipe ports. It is mainl
Inquiry
- Our factory's flat pipe caps highlight four core advantages: solid structure, high flatness, easy installation, and extremely high cost-effectiveness
- making them the preferred product in the field of low-pressure pipeline sealing. The product is integrally formed by forging and stamping from a single steel plate
- The plate surface is flat without deformation, without sand holes, and without air pores
- Precise face perpendicularity
- Excellent weld fit
Detailed Introduction
Flat bottom pipe caps are a basic pipe fitting product we offer for low-pressure pipeline plugging needs. Unlike spherical, butterfly, and elliptical curved heads, their end face is a flat planar structure with no curved arc or folded edge, offering simple structure, low cost, and easy installation. The product is integrally stamped or forged from a single steel plate, with a flat surface, strong rigidity, resistance to deformation, high welding fit, and stable plugging and sealing performance. The flat bottom pipe caps we produce follow the general pipe fitting standards GB/T12459 and ASME B16.9, with nominal diameters covering DN15 to DN2000, wall thicknesses from 3mm to 80mm, and materials covering carbon steel, stainless steel, and alloy steel. They support production of conventional standard sizes and thickened non-standard sizes. The pressure-bearing characteristics are suitable for atmospheric pressure, PN10, PN16, and PN25 low-pressure working conditions, and are not suitable for medium- and high-pressure severe equipment scenarios. The main uses are permanent sealing of pipeline ends, plugging of idle pipe openings, sealing of reserved connections, and final closure in pipeline modifications, suitable for harmless media working conditions such as water, gas, oil, and ordinary fluids.
- The end face is a flat planar structure with no curved arc, making installation and alignment convenient and welding fit high
- Integrally stamped or forged from a single steel plate, with a flat surface, no sand holes, no air holes, and precise end face perpendicularity
- Strong overall rigidity, not prone to warping, cracking, or deformation during long-term use, with stable plugging and sealing performance
- Covers the full series of materials including carbon steel, stainless steel, and alloy steel, and supports DN15-DN2000 standard and non-standard customization
- MOQ for conventional in-stock standard models is as low as 1 piece, suitable for foreign trade trial orders, engineering replenishment, and small-batch procurement
- Uses standardized protective packaging for foreign trade export, suitable for long-distance transport by sea, land, and air
| Product Name | Flat Cap |
| Category | Contact us to confirm |
| The various parameters of flat bottom pipe caps strictly follow international general industrial standards, with precise dimensions, controllable tolerances, and a high acceptance pass rate. The nominal diameter range is DN15-DN2000, the controllable wall thickness is 3mm-80mm, and conventional models and thickened pressure-resistant models can be freely selected according to low-pressure and atmospheric pressure working conditions. Conventional working temperature range | Carbon steel -20℃ to 420℃, stainless steel -80℃ to 600℃, suitable for normal temperature and conventional temperature difference working conditions. Applicable pressure ratings PN10-PN25 national standard low-pressure ratings, Class150-Class300 American standard low-pressure ratings, mainly for stable use at atmospheric pressure and low pressure. Production execution standards are GB/T12459, ASME B16.9 general pipe fitting standards. Forming processes are integral forging and integral stamping, with flat plate surface and dense structure. The mainstream connection method is butt welding connection, compatible with socket welding and threaded connection. Surface treatment includes sandblasting rust prevention, black paint anti-corrosion, stainless steel pickling and polishing, and anti-rust oil treatment. Product plate surface flatness, verticality, and thickness deviation are strictly controlled within the tolerance range allowed by national standards, can provide |
| Customization | Our factory possesses comprehensive non-standard customization capabilities for flat bottom pipe caps, able to precisely match customers' special working conditions and personalized engineering needs, solving the problem of limited adaptability of standard models. Specification customization supports DN15-DN2000 arbitrary non-standard diameters, ultra-thick thickened plate surfaces, special-shaped square and round structures, and special eccentric dimension customization, with plate surface flatness, end face angle, and welding groove style adjustable on demand. Material customization, in addition to conventional carbon steel and stainless steel, can customize low-alloy heat-resistant steel, duplex stainless steel, and corrosion-resistant special alloy materials, adapting to special medium working conditions. Process customization supports rust prevention enhancement, internal and external anti-corrosion plastic coating, mirror polishing, fine sandblasting treatment, and acid-base resistant passivation treatment. Can carry out one-on-one mold production according to customer drawings, samples, and equipment installation parameters, strictly controlling plate surface flat |
| MOQ | In order to adapt to diverse procurement needs such as foreign trade trial orders, overseas stockpiling, sporadic engineering replenishment, and large-volume centralized procurement, our factory has set relaxed and flexible minimum order quantity standards for flat bottom pipe caps, greatly lowering the cooperation threshold for global customers. Conventional in-stock standard diameters, conventional wall thicknesses, and conventional material models have an MOQ as low as 1 piece, supporting overseas customers' sample testing, partial engineering replenishment, and small-order trial sales cooperation, suitable for |
| Lead Time | Our factory has standardized production lines and a large in-stock warehousing base. Flat bottom pipe cap order delivery times are stable and efficient, fully matching foreign trade shipping rhythms and domestic engineering schedules. National standard and American standard conventional in-stock models sold on the platform complete quality inspection, packaging, and outbound delivery within 24 to 48 hours after payment confirmation, achieving extremely fast shipping. For conventional standard batch orders within 1000 pieces, production delivery time is stable |
| Packaging | Our factory's flat bottom pipe caps use standardized protective packaging dedicated to foreign trade export, suitable for cross-border long-distance transportation by sea, land, and air, comprehensively protecting product plate surface flatness, free of scratches, free of bumps, and free of deformation. Small-diameter flat bottom plugs are individually wrapped in waterproof PE film, with anti-scratch protective film applied on the surface, filled with shock-absorbing foam, avoiding friction damage to flatness precision during transportation. Medium and large-diameter flat bottom pipe caps are equipped with protective pads on both sides, with ports sealed against dust, and the outer layer wrapped in thickened waterproof and rainproof cloth, eliminating moisture and rust. The entire batch of goods is uniformly and neatly stacked on fumigation-free solid wood pallets, fastened with high-strength strapping bands and integrally wrapped and sealed with multi-layer stretch film, preventing displacement, loosening, and edge lifting during transportation bumps. All packaging complies with customs export inspection standards, requiring no secondary fumigation, saving customs clearance time |
| Reference Price | Inquiry |
Applications
- End sealing and engineering finishing of municipal water supply and drainage pipe networks, HVAC heating pipelines, and fire standby pipelines
- Permanent or temporary closure of reserved interfaces and idle pipe openings in building mechanical and electrical installation
- Port sealing of factory circulating water pipelines, sewage treatment low-pressure pipelines, and power auxiliary pipelines
- Pipe opening end sealing for atmospheric pressure water tanks, water storage tanks, and low-pressure buffer vessels
- Construction stages such as old pipeline network renovation, abandoned pipe opening sealing, and equipment maintenance sealing
Overview
A flat-bottom pipe cap is a pipeline plugging fitting with a flat end face, also called a flat-bottom head, flat cover pipe cap, or flat plate plug. Its structure is simpler than spherical, butterfly, or elliptical heads, with no curved surface curvature or folded edges, and it belongs to low-pressure dedicated pipeline terminal plugging fittings. We use a whole steel plate integrally stamped or forged into shape; the product has a flat surface, dense structure, strong rigidity, high welding fit, and stable sealing performance. Flat-bottom pipe caps follow the GB/T12459 and ASME B16.9 general fitting standards, with nominal diameters covering DN15 to DN2000, wall thicknesses from 3mm to 80mm, and materials covering carbon steel, stainless steel, and alloy steel. The pressure-bearing characteristics are suitable for atmospheric pressure, PN10, PN16, and PN25 low-pressure working conditions, and they are mainly used for permanent sealing of pipeline ends, sealing of idle pipe openings, and final closure of pipeline renovation.
Key Features
The core advantages of flat-bottom pipe caps are concentrated in three aspects: structure, installation, and cost. In terms of structure, the whole steel plate is integrally formed, the surface is flat without deformation, sand holes, or pores, the end face perpendicularity is precise, the overall rigidity is strong, and it is not prone to warping or cracking during long-term use. In terms of installation, the flat end face is convenient for alignment, the welding fit is high, the sealing performance is stable, and later maintenance costs are low. In terms of cost, the production process is simple and material consumption is low, making it a plugging fitting with outstanding cost-effectiveness for atmospheric pressure and low-pressure working conditions. In terms of materials, we provide a full series of options including carbon steel, stainless steel, and alloy steel, support production of conventional standard sizes and thickened non-standard sizes, and can configure according to project needs.
Applications
Flat-bottom pipe caps are mainly intended for industrial and civil pipeline plugging scenarios at atmospheric pressure, low pressure, and normal temperature. In civil engineering, they are used for end sealing and project final closure of building water supply and drainage networks, HVAC heating pipelines, fire standby pipelines, and low-pressure gas transmission networks. In light industry, they are suitable for low-pressure process pipeline sealing operations in food, pharmaceutical, textile, and HVAC equipment. In industry, they can be used for plugging auxiliary power pipelines, plant circulating water pipelines, low-pressure sewage treatment pipelines, and auxiliary low-pressure oil and gas pipelines. In addition, they are also suitable for pipe opening end sealing of atmospheric pressure water tanks, water storage tanks, and low-pressure buffer vessels. They can be used for indoor closed pipelines, outdoor plant pipelines, and buried low-pressure pipelines. They are not suitable for high-pressure, high-temperature, or strongly corrosive severe working conditions.
Specifications
The nominal diameter range of flat-bottom pipe caps is DN15 to DN2000, with controllable wall thickness from 3mm to 80mm, and conventional or thickened pressure-resistant versions can be selected according to low-pressure and atmospheric pressure working conditions. Materials cover carbon steel, stainless steel, and alloy steel; please contact us to confirm specific grades. Applicable pressure ratings include atmospheric pressure, PN10, PN16, and PN25 national standard low-pressure ratings and Class150-Class300 American standard low-pressure ratings. The working temperature range for carbon steel is -20℃ to 420℃, and for stainless steel is -80℃ to 600℃. Production follows GB/T12459 and ASME B16.9 standards, the forming process is integral forging or integral stamping, the mainstream connection method is butt welding, and socket welding and threaded connection are compatible. Surface treatment options include sandblasting anti-rust, black paint anti-corrosion, stainless steel pickling and polishing, or anti-rust oil treatment. Surface flatness, perpendicularity, and thickness deviation are controlled within the allowable tolerance range of the national standard.
Purchase & Delivery
We have set flexible minimum order quantity standards for flat-bottom pipe caps. For conventional in-stock standard diameters, conventional wall thicknesses, and conventional material models, the MOQ is as low as 1 piece, suitable for overseas customers' sample inspection, local project replenishment, and small-order trial sales. The platform sells conventional in-stock models under national and American standards, and after payment confirmation, quality inspection, packing, and dispatch are completed within 24 to 48 hours. For conventional standard batch orders within 1000 pieces, the delivery time is stable; please contact us to confirm the specific delivery time. Packaging uses standardized protective packaging for foreign trade export. Small-diameter products are individually wrapped in waterproof PE film and filled with shock-absorbing foam. Medium and large-diameter products are fitted with protective pads on both sides, with ports sealed against dust, and the outer layer is wrapped in thickened waterproof and rainproof cloth. The entire batch of goods is stacked on fumigation-free solid wood pallets, secured with high-strength strapping, and sealed with multiple layers of stretch film, meeting customs export inspection standards. Customer-specific shipping marks, LOGO, specification models, and quantity markings can be printed as needed.
Service & Support
We provide full-process support before, during, and after sales for customers purchasing flat-bottom pipe caps. In the pre-sales stage, the technical team can assist with working condition analysis, model selection, and parameter matching to help avoid selection errors. In the order execution stage, full logistics tracking is provided after shipment, with real-time synchronization of logistics updates, assisting overseas customers with customs clearance and receipt of goods. In the after-sales stage, welding installation guidance and technical Q&A are provided. The product warranty period is 18 months, and within the warranty period, quality problems not caused by human damage are repaired or replenished free of charge. If there are factory quality defects, dimensional deviations, material inconsistencies, or process defects, free return, exchange, and replacement shipment are supported. Dedicated after-sales specialists respond online 7×24 hours to handle order, quality, and logistics issues.
FAQ
What working conditions are flat bottom pipe caps suitable for?
Flat bottom pipe caps are specially designed for atmospheric pressure, low pressure, and normal temperature pipelines, and are suitable for sealing water supply and drainage, HVAC, gas, and low-pressure equipment pipelines. Applicable pressure ratings include atmospheric pressure, PN10, PN16, PN25 national standard low-pressure ratings, and Class150-Class300 American standard low-pressure ratings. They are not recommended for high pressure, high temperature, or highly corrosive severe working conditions.
What is the difference between flat bottom pipe caps and spherical or dished heads?
Flat bottom pipe caps are flat sealing structures with no curved surface curvature or flanged edge. They have a simple structure, low cost, and are easy to install, and are mainly used for low-pressure ordinary pipelines. Spherical, dished, and elliptical heads have stronger curved surface pressure-bearing capacity and are suitable for medium and high pressure pressure vessel equipment. The two have different applicable working conditions. When selecting models, please confirm according to the actual pressure rating.
Can flat bottom pipe caps be exported?
Yes. Our flat bottom pipe caps are produced in accordance with the general pipe fitting standards GB/T12459 and ASME B16.9. Packaging uses standardized protective packaging for foreign trade export, complies with customs export inspection standards, and requires no secondary fumigation. They support cross-border long-distance transportation by sea, land, and air, and can print customer-specific shipping marks, LOGOs, and specification markings as needed.
What are the minimum order quantity and delivery time for flat bottom pipe caps?
For regular stock standard diameters, regular wall thicknesses, and regular material models, the MOQ is as low as 1 piece, suitable for sample inspection and small trial sales orders. For national standard and American standard regular stock models sold on the platform, outbound shipment is completed within 24 to 48 hours after payment confirmation. For regular standard bulk orders within 1000 pieces, the delivery time is stable. For non-standard customization and large-volume orders, please contact us to confirm the specific delivery time.
What customization options are supported for flat-bottom pipe caps?
We support customization of any non-standard diameter from DN15 to DN2000, ultra-thick thickened plate surfaces, special-shaped square and round structures, and special eccentric dimensions, and can adjust the plate surface flatness, end face angle, and welding groove style as needed. In terms of materials, in addition to conventional carbon steel and stainless steel, we can customize low-alloy heat-resistant steel, duplex stainless steel, and corrosion-resistant special alloys. In terms of processes, we support rust-proof strengthening, internal and external anti-corrosion plastic coating, mirror polishing, sandblasting fine treatment, and acid- and alkali-resistant passivation treatment. We can carry out one-on-one mold production according to customer drawings, samples, or equipment installation parameters.
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