Manufacturer, Supplier & Exporter of Internal Epoxy + External 3LPE Coated Pipes

Riddhi Siddhi Impex is a prominent manufacturer and supplier of high-quality industrial pipes in India, specializing in a wide range of carbon steel products. Among their offerings, the Internal Epoxy + External 3LPE Coated Pipes stand out for applications requiring exceptional corrosion resistance and long-term durability. These pipes combine an internal epoxy coating with a three-layer polyethylene (3LPE) external coating, ensuring protection against chemical corrosion, moisture, and mechanical impact. Such coatings are critical for pipelines in oil and gas, water transportation, chemical industries, and marine environments..

The internal epoxy coating provides a smooth surface inside the pipe, which minimizes friction and prevents the accumulation of scale or sediments. This coating is also resistant to acidic and alkaline substances, making it suitable for transporting water, petroleum products, and chemicals safely. The epoxy lining ensures longevity of the pipeline while reducing maintenance requirements. This internal protection complements the external 3LPE coating, which safeguards the pipe from external corrosive elements, soil, and weather conditions..

Externally, the 3LPE coating consists of three layers: a fusion-bonded epoxy (FBE) primer layer, an adhesive layer, and a polyethylene topcoat. This combination provides excellent adhesion to the steel substrate, mechanical protection during handling and transportation, and robust resistance against corrosion from soil, water, and atmospheric conditions. The three-layer construction also offers flexibility and impact resistance, which is crucial when pipes are installed underground or in harsh terrains...

Riddhi Siddhi Impex manufactures these coated pipes in compliance with international standards such as API 5L, ASTM A106/A53, ISO 21809-1, and DIN 30678. Their manufacturing facilities ensure strict quality control at every stage, from steel selection and fabrication to coating application and final testing. The company can supply pipes in various sizes ranging from 1/2” NB to 48” NB, wall thicknesses from Sch 20 to XXS, and in single, double, or custom cut lengths, catering to diverse project requirements across India..

One of the key advantages of sourcing from Riddhi Siddhi Impex is their ability to serve a wide range of domestic cities efficiently. They supply pipelines to metropolitan and industrial hubs including Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Navsari, Valsad, Rajpipla, among others. Their strong logistics network ensures timely deliveries and efficient handling across these locations..

Internal Epoxy + External 3LPE Coated Pipes

Specification

Product Name	Internal Epoxy + External 3LPE Coated Pipes
Manufacturer	Riddhi Siddhi Impex
Base Material	Carbon Steel (ASTM A106 / A53 / API 5L)
Internal Coating	Epoxy Lining (≥250 μm)
External Coating	Three-Layer Polyethylene (3LPE)
Standard	API 5L / ASTM A106 / ISO 21809-1 / DIN 30678
Size Range	1/2” NB to 48” NB
Wall Thickness	Sch 20 to Sch 160 / XXS
Length	Single Random, Double Random, Cut Lengths
Pipe Ends	Plain End (PE), Beveled End (BE), Threaded
Form	Seamless, Welded, ERW, LSAW
Applications	Oil & Gas, Water Supply, Chemical Transport, Marine Projects

Chemical Composition (Base Carbon Steel)

Element	Content (%)
Carbon (C)	0.23 Max
Manganese (Mn)	0.30 – 1.06
Phosphorus (P)	0.05 Max
Sulfur (S)	0.045 Max
Silicon (Si)	0.10 – 0.35
Copper (Cu)	0.40 Max
Nickel (Ni)	0.40 Max
Chromium (Cr)	0.40 Max

Mechanical Properties

Property	Value
Tensile Strength	≥ 415 MPa
Yield Strength (0.2% offset)	≥ 240 MPa
Elongation	≥ 20%
Hardness	≤ 95 HRB
Impact Resistance	Excellent (Due to Coatings)
Coating Adhesion	Strong Adhesion per ISO 21809-1

Dimension Chart (Nominal)

Nominal Pipe Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Length
1/2"	21.3	2.77	Up to 12 m
1"	33.4	3.38	Up to 12 m
2"	60.3	3.91	Up to 12 m
4"	114.3	6.02	Up to 12 m
6"	168.3	7.11	Up to 12 m
10"	273.1	9.27	Up to 12 m
16"	406.4	12.70	Up to 12 m

Equivalent Grades

Standard	Grade
ASTM	A106 Grade B / A53 Grade B
API	5L Grade B / X42 / X52
EN	EN 10216 / EN 10224
DIN	St 37.2 / St 52.3
BS	3601 / 3602

Equivalent Standards

Standard	Description
ASTM A106 / A53	Standard Specification for Carbon Steel Pipe for High-Temperature and Pressure Service
API 5L	Specification for Line Pipe
ISO 21809-1	External Polyethylene Coatings for Buried or Submerged Pipelines
DIN 30678	Three-Layer Polyethylene Coating for Steel Pipes

Other Types of Coated Steel Pipes

Type	Description
3LPE Coated Pipes	External three-layer polyethylene coated pipes for corrosion protection
FBE Coated Pipes	Fusion Bonded Epoxy coated pipes for superior adhesion and corrosion resistance
Internal Epoxy Coated Pipes	Pipes with internal epoxy lining for smooth fluid flow and corrosion resistance
PE Coated Pipes	Polyethylene-coated carbon steel pipes for underground applications

These coated pipes are highly versatile and used in multiple industries. They are ideal for oil and gas transmission pipelines, chemical transport pipelines, municipal water systems, marine pipelines, and industrial process pipelines. Their corrosion-resistant properties reduce maintenance costs and extend operational life, making them a cost-effective solution for large-scale projects. The combination of internal epoxy and external 3LPE ensures comprehensive protection against both internal fluid-related corrosion and external environmental damage.

Frequently Asked Questions (FAQs)

Q1: What are the main applications of Internal Epoxy + External 3LPE Coated Pipes?

A1: They are widely used in oil & gas pipelines, chemical transport, municipal water supply, and marine projects.

Q2: Can the coating thickness be customized?

A2: Yes, Riddhi Siddhi Impex offers customization of internal epoxy and external 3LPE thicknesses based on project requirements.

Q3: Are these pipes available in all major Indian cities?

A3: Yes, these pipes are supplied to cities including Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, and many others.

Q4: What standards do these pipes comply with?

A4: The pipes comply with ASTM, API, ISO 21809-1, and DIN standards ensuring high-quality performance and durability.