2LPP Coated Pipes, also known as Two‑Layer Polypropylene Coated steel pipes, are structural pipes made from a steel substrate (typically carbon steel or alloy steel) which are externally coated with a two‑layer system: a fusion bonded epoxy (FBE) primer layer followed by an outer polypropylene (PP) layer. This configuration gives enhanced corrosion resistance and mechanical protection compared to basic coatings. As described in coating technology literature, the 2LPP system combines FBE for strong adhesion and a tough polypropylene layer for abrasion and impact resistance...
Riddhi Siddhi Impex positions itself as a leading manufacturer, supplier and exporter of metal products such as pipes, tubes, flanges, fittings and plates in India. While their broad product catalogue covers many pipe systems, by leveraging their manufacturing and distribution infra they are capable of sourcing and supplying coated high‑performance pipelines such as 2LPP coated pipes. Their manufacturing and stock capabilities allow servicing of large industrial, oil & gas, water and infrastructure projects across the country..
Choosing the two‑layer polypropylene coating offers several advantages: the FBE primer layer provides excellent adhesion and corrosion barrier; the outer polypropylene provides strong resistance to abrasion, mechanical damage, and environmental exposure (temperature, soil stress). According to sources, 2LPP coatings are suitable for harsher conditions than simpler coatings and can be used in higher temperature or more demanding environments..
2LPP coated pipes are widely used in oil & gas pipeline systems (onshore and offshore), buried pipelines for water or chemicals, industrial pipelines in aggressive environments, and infrastructure projects where durability is required. Because the polypropylene layer adds mechanical robustness, these pipes are suitable for installation conditions with heavy handling, abrasion risk or underground/underwater placement...
Riddhi Siddhi Impex supplies 2LPP coated pipes across many Indian cities and industrial hubs: major metros such as Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara; regional hubs like Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi; northern and border cities such as Amritsar, Chandigarh; southern centres like Mysuru (Mysore), Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore; plus industrial clusters like Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Navsari, Valsad, Rajpipla, Narmada. Their nationwide reach ensures that large scale project pipelines in India can be supported from procurement to delivery and installation..
| Grade | Carbon Steel / Alloy Steel substrate |
|---|---|
| Standard | API 5L, ASTM A53, ISO 21809‑1, GB/T 23257‑2009 |
| Coating Type | Two‑Layer Polypropylene (FBE primer + Polypropylene outer layer) |
| Pipe Outer Diameter | 21 mm – 1219 mm (or as per project requirement) |
| Pipe Wall Thickness | 2.0 mm – 25 mm (varies by grade & size) |
| Length | 6 m / 12 m / Custom lengths |
| Application | Oil & Gas, Chemical Plants, Water & Industrial Pipelines with moderate to high temperature |
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.18 – 0.28 (typical for pipeline grade CS) |
| Manganese (Mn) | 0.40 – 1.20 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 0.40 |
| Property | Value |
|---|---|
| Tensile Strength | 415 – 550 MPa |
| Yield Strength | 250 – 350 MPa |
| Elongation | ≥ 20% |
| Operating Temperature Range (coating) | Up to ~90‑110 °C (depending on polymer) :contentReference[oaicite:0]{index=0} |
| Nominal Pipe Size (NPS) | Outside Diameter (mm) | Wall Thickness (mm) |
|---|---|---|
| ½” | 21.3 | 2.77 |
| 1” | 33.4 | 3.38 |
| 2” | 60.3 | 3.91 |
| 4” | 114.3 | 6.02 |
| 6” | 168.3 | 7.11 |
| 8” | 219.1 | 8.18 |
| 12” | 323.9 | 9.53 |
| Standard | Grade |
|---|---|
| API | X42, X52, X60 (PSL‑1 / PSL‑2) |
| ASTM | A53, A106 |
| EN | EN 10208‑2 L245/L290 etc. |
| Standard | Description |
|---|---|
| ISO 21809‑1 | External coatings for buried or submerged pipelines for oil & gas transportation systems (2LPE/2LPP) :contentReference[oaicite:1]{index=1} |
| GB/T 23257‑2009 | Polyethylene and Polypropylene coating for pipeline steel pipes |
| SY/T 0315‑2002 | External coating for steel pipeline (2LPE, 2LPP) :contentReference[oaicite:2]{index=2} |
| Type | Description |
|---|---|
| 2LPE Coated Pipes | Two‑layer Polyethylene coating (FBE primer + polyethylene) suitable for moderate temperature environments :contentReference[oaicite:3]{index=3} |
| 3LPP Coated Pipes | Three‑layer Polypropylene coating (FBE primer + adhesive + polypropylene outer layer) for higher temperature and more demanding conditions :contentReference[oaicite:4]{index=4} |
| FBE (Fusion Bonded Epoxy) Coated Pipes | Single‑layer epoxy coating for baseline corrosion protection :contentReference[oaicite:5]{index=5} |
The technical benefits of using 2LPP coated pipes include enhanced mechanical protection (impact, abrasion), improved service life, resistance to soil corrosion, and suitability for more challenging temperature ranges than simpler coatings. From a logistics perspective, Riddhi Siddhi’s supply across the Indian domestic network ensures that projects based in remote or tier‑2/3 cities can access coated pipes without long procurement delays. Their stock‑holding, transport, and handling practices are designed to maintain coating integrity through to installation..
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