Manufacturer, Supplier & Exporter of API 5L Grade B Spool

API 5L Grade B Spool is a high‑performance steel piping component used broadly in pipeline and fluid transport systems. The spool is fabricated from seamless or welded carbon steel pipe constructed to the API 5L Grade B specification, ensuring reliable strength, good weldability, and long-term durability under pressure. Riddhi Siddhi Impex, a reputed name in the steel fabrication industry, manufactures these spools to exacting standards, making them a trusted API 5L Grade B Spool domestic supplier...

As a manufacturer, Riddhi Siddhi Impex produces a wide range of spool configurations including straight runs, elbows, tees, reducers, and specially fabricated spool assemblies. All spool assemblies are created using advanced CNC-cutting, high-precision welding (SMAW, MIG, TIG), and rigorous quality checks such as hydro-testing and dimensional inspection. This ensures that each API 5L Grade B Spool meets the mechanical and dimensional requirements mandated by pipeline systems.

In major metropolitan and industrial centers such as Mumbai, Delhi, and Bengaluru (Bangalore), Riddhi Siddhi Impex has established a strong presence as a reliable API 5L Grade B Spool supplier. These cities serve as critical hubs for infrastructure development, pipeline construction, and cross‑city transport networks. The company’s domestic production and inventory help streamline delivery for large-scale EPC (Engineering, Procurement & Construction) contracts in these regions..

Industrial demand in Hyderabad, Chennai, and Kolkata is particularly strong for process piping and natural gas pipeline projects. Riddhi Siddhi Impex supports these markets with ready-to-install API 5L Grade B Spools that provide excellent pressure handling capacity, dimensional stability, and consistent material quality. Their supply network ensures timely dispatch and coordination with site engineers for installation..

In north‑Indian and emerging industrial cities such as Jaipur, Kanpur, Lucknow, Agra, and Varanasi, Riddhi Siddhi Impex provides API 5L Grade B Spools for utility pipelines, chemical transport, and process installations. Their ability to serve these regions with quality-assured spool assemblies makes them a preferred domestic supplier, reducing the need for long imports and minimizing supply chain risk..

API 5L Grade B Spool

Specification

Product Name	API 5L Grade B Spool
Manufacturer	Riddhi Siddhi Impex
Base Material	Carbon Steel
Standard	API 5L Grade B
Pipe Form	Seamless / Welded / ERW / LSAW
Size Range	1/2" NB to 48" NB
Wall Thickness	Sch 10 to Sch XXS
Length	Single Random / Double Random / Cut Lengths
Applications	Pipelines, Gas Distribution, Oil & Gas, Chemical Plants

Chemical Composition (Carbon Steel)

Element	Content (%)
Carbon (C)	0.28 Max
Manganese (Mn)	0.60 – 1.20
Phosphorus (P)	0.035 Max
Sulfur (S)	0.035 Max
Silicon (Si)	0.10 – 0.35
Nickel (Ni)	0.40 Max
Chromium (Cr)	0.30 Max
Copper (Cu)	0.40 Max

Mechanical Properties

Property	Value
Tensile Strength	415 – 550 MPa
Yield Strength (0.2% offset)	240 MPa Min
Elongation	20% Min
Hardness	≤ 95 HRB

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
API 5L	Specification for Line Pipe
ASTM A106 / A53	Carbon Steel Pipe for High-Temperature and Pressure Service
EN 10216	Seamless Steel Pipes for Pressure Purposes
DIN 17175 / DIN 1626	Seamless Steel Tubes and Pipes

Other Types of Pipes

Type	Description
API 5L Grade X42/X52	Higher tensile strength line pipes for oil and gas pipelines
ASTM A106 Grade B/C	Seamless carbon steel pipes for high-temperature services
ERW Pipes	Electric resistance welded pipes for general purposes
LSAW / SSAW Pipes	Longitudinal / Spiral Submerged Arc Welded pipes for large diameter applications

Finally, in the major industrial corridors of Dahej, Vilayat, Somnath, Narmada, Ankleshwar, Navsari, Valsad, and Rajpipla, which host large petrochemical and engineering complexes, Riddhi Siddhi Impex is a go-to API 5L Grade B Spool domestic supplier. Their robust production capacity, quality documentation (MTCs, NDT reports), and efficient logistics help contractors and project owners to meet demanding timelines and stringent technical specifications for pipeline projects across India..

Frequently Asked Questions (FAQs)

Q1: What are the primary applications of API 5L Grade B Spool?

A1: They are used for oil & gas pipelines, water supply, chemical transport, and high-pressure fluid systems.

Q2: Can Riddhi Siddhi Impex provide custom sizes?

A2: Yes, custom lengths, diameters, and wall thicknesses can be supplied according to project specifications.

Q3: Is API 5L Grade B Spool suitable for high-temperature applications?

A3: Yes, it is suitable for high-temperature and high-pressure pipeline service up to 400°C.

Q4: Which Indian cities does Riddhi Siddhi Impex supply API 5L Grade B Spools to?

A4: Major cities include Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, and many more domestic locations.