Pipe Cap

Overview of Pipe Cap​

Sikerui Pipe Cap​ is a precision-engineered pipe fitting designed to seal the ends of pipelines, providing critical protection against contamination, corrosion, and physical damage in industrial, commercial, and residential piping systems . Manufactured from materials including PVC, stainless steel, carbon steel, and alloys, pipe caps ensure leak-proof closure for pipes ranging from ½” to 48″ (DN15 to DN1200) in diameter, with pressure ratings spanning Class 150 to 2500 (per ASME B16.9 standards) . These caps are available in threaded, butt-weld, socket-weld, and push-on configurations, accommodating diverse installation requirements while maintaining integrity under temperatures from -50°C to 400°C . Engineered to meet international standards such as ISO 5251, ASME B16.9, and DIN 2605, pipe caps serve as essential components in safeguarding pipeline systems during construction, maintenance, or long-term storage, with a service life exceeding 35 years in demanding environments . Their simple yet robust design minimizes pressure loss, prevents fluid leakage, and resists chemical, UV, and abrasion damage, making them a cost-effective solution for applications from water supply to hazardous chemical transport .

Key Features of Pipe Cap​

1. Superior Sealing Performance​
   Pipe caps create leak-proof seals​ through precision-machined threads, welded joints, or compression fittings, effectively blocking moisture, dust, and contaminants from entering pipeline systems . This ensures the integrity of stored fluids or gases and prevents corrosion during downtime or testing phases .
2. Corrosion and Chemical Resistance​
   Constructed from materials such as stainless steel (304/316), PVC, and LDPE, pipe caps demonstrate exceptional resistance to acids, alkalis, and corrosive media, making them suitable for chemical processing, oil and gas, and water treatment applications . Special coatings like epoxy or galvanization further enhance durability in aggressive environments .
3. High-Pressure and Temperature Tolerance​
   Pipe caps withstand pressures up to 6,000 PSI​ and temperatures from -50°C to 400°C, depending on material and design . Butt-weld caps excel in high-pressure systems, while threaded variants offer reusable solutions for moderate conditions .
4. Easy Installation and Reusability​
   Lightweight designs allow for tool-free installation​ in many cases, with threaded and push-on caps enabling quick deployment or removal without specialized equipment . Reusable configurations reduce long-term maintenance costs and downtime .
5. Versatile Material and Size Options​
   Available in sizes from ½” to 48″ and materials including carbon steel, PVC, stainless steel, and HDPE, pipe caps adapt to specific operational needs, whether for high-temperature steam lines, potable water systems, or chemical transport . Customization supports non-standard diameters and shapes (e.g., oval, rectangular) .
6. Environmental Protection and Safety​
   Pipe caps act as barriers against environmental hazards, preventing accidental emissions of hazardous fluids and complying with safety regulations in industries like petroleum and pharmaceuticals . Their use in pressure testing ensures system reliability before commissioning .

Typical Applications of Pipe Cap​

• Pipeline Maintenance and Testing: Used to seal pipe ends during hydrostatic testing, system repairs, or temporary shutdowns, ensuring no contaminants enter the line and maintaining pressure integrity for safety checks .
• Chemical and Petrochemical Plants: Protect pipelines transporting acids, solvents, and hydrocarbons from corrosion and leakage, with stainless steel or alloy caps providing resilience in aggressive environments .
• Water and Wastewater Systems: PVC or HDPE caps serve in potable water distribution and drainage networks, preventing debris ingress and complying with health standards such as NSF/ANSI 61 .
• Oil and Gas Pipelines: Shield pipe ends from moisture, sulfur, and mechanical damage in upstream and midstream operations, with coatings like 3LPE enhancing longevity in sour service conditions .
• Construction and Plumbing: Secure exposed pipes during building projects, preventing accidental damage and ensuring cleanliness until system commissioning .
• Electrical Conduit Protection: Non-conductive PVC or LDPE caps safeguard conduit threads from moisture and dust, maintaining insulation integrity in electrical installations .

Technical Specifications​

Table: Standard Pipe Cap Specifications

SIZE	Number	D1	D2	L1	L2
DN15	GD15	20.3	26.3	16.5	21.81
DN20	GD20	25.3	31.9	19	25.68
DN25	GD25	32.35	39.95	22.5	30.62
DN32	GD32	40.4	49.8	26.5	36.81
DN40	GD40	50.45	60.25	31.5	44.68
DN50	GD50	63.5	75.9	38	53.81
DN65	GD65	75.5	88.91	44	62.44
DN80	GD80	90.55	105.15	51.5	73.11
DN100	GD100	110.6	127.39	61.5	84.27
DN125	GD125	140.6	161.4	76	110.06
DN150	GD150	160.7	184.5	86.5	125.9
dn200	GD200	200	228.1	107.37	147
DN200	GD200	226.2	253.8	118.5	170.58
dn250	GD250	250	283.4	131.5	180
DN250	GD250	281.5	314.8	147	213
DN300	GD300	316.7	344.5	165	216
DN350	GD350	356.8	395	185	252
DN400	GD400	402	442	208	285
DN350 (PN10)	GD350	356.8	386.2	183.5	255
DN400 (PN10)	GD400	402	432.7	208	296

Frequently Asked Questions (FAQs)​

Q1: What materials are available for pipe caps, and how do I select the right one?​

Pipe caps come in PVC, stainless steel, carbon steel, and plastics like LDPE, each suited to specific conditions . Choose PVC for chemical resistance in water systems, stainless steel for high-temperature/corrosive environments, and carbon steel for high-pressure applications . Consult material compatibility charts based on fluid type, temperature, and pressure .

Q2: Can pipe caps be customized for non-standard sizes or shapes?​

Yes, manufacturers offer custom diameters up to 88 inches, oval or rectangular profiles, and specialized coatings (e.g., 3LPE for corrosion resistance) . Provide design specifications for tailored solutions, with lead times typically 2–4 weeks for custom orders .

Q3: What is the difference between a threaded pipe cap and a welded cap?​

Threaded caps allow reusable, non-permanent sealing​ ideal for maintenance, while welded caps provide a permanent, leak-proof bond for high-pressure or critical systems . Welded variants excel in volatile environments, whereas threaded types offer flexibility for frequent access .

Q4: How do pipe caps perform under extreme temperatures or pressures?​

Stainless steel caps withstand temperatures up to 400°C and pressures to 6,000 PSI, while PVC caps are limited to 60°C and lower pressures . Select materials based on operational limits, and verify ratings with standards like ASME B16.9 for safety .

Q5: What certifications ensure pipe cap quality?​

Reputable products comply with ISO 9001, ASME B16.9, and PED directives, supported by material test reports (MTRs) and hydrostatic testing certificates . These ensure adherence to safety and performance benchmarks for industrial use .