Manufacturer, Supplier & Exporter of API 5L X56 Spool

API 5L X56 Spool is a high-performance carbon steel piping component tailored for pipeline systems where strength, reliability, and long-term durability are crucial. The “X56” grade under the API 5L specification signifies a minimum yield strength of ~56,000 psi (386 MPa), making it a robust choice for demanding oil & gas, water, and industrial transportation lines. Riddhi Siddhi Impex, with its strong fabrication capabilities, manufactures these spools to exacting standards, establishing itself as a trusted API 5L X56 Spool domestic supplier in India..

At the heart of Riddhi Siddhi Impex’s manufacturing operations is a modern facility equipped with CNC cutting, automated welding (SMAW / SAW / ERW), and precision finishing. The company produces a variety of spool configurations—straight pipe sections, elbow spools, tees, reducers, and fully custom spool assemblies. Every spool is subjected to dimension checks, alignment inspection, and welding verification to ensure that it meets project isometrics and installation requirements.

Quality assurance is critical for pressure piping, and Riddhi Siddhi Impex ensures that API 5L X56 Spools undergo rigorous testing. Each fabricated spool typically undergoes hydrostatic pressure testing to verify its integrity, followed by non-destructive tests (NDT) like ultrasonic or radiography to detect internal imperfections. Material Test Certificates (MTC) are provided to clients for traceability, reinforcing their position as a high-quality domestic supplier..

In Mumbai, Delhi, and Bengaluru (Bangalore)—some of India’s largest infrastructure hubs—Riddhi Siddhi Impex plays a vital role as a spool supplier. Their API 5L X56 Spools are used in cross‑city gas transmission systems, utility pipelines, and onshore fluid transport networks. Their local manufacturing presence helps contractors reduce lead times and lowers the risk associated with importing spools..

In the southern and eastern industrial corridors—Hyderabad, Chennai, and Kolkata—there is strong demand for spool assemblies that can safely carry high-pressure fluid. Riddhi Siddhi Impex supports these markets with X56-grade spool assemblies that balance ductility and strength, enabling pipeline integrators to safely manage gas, oil, or water flow in complex infrastructure or process plants..

API 5L X56 Line Pipes

Specification

Product Name	API 5L X56 Line Pipe
Manufacturer	Multiple Suppliers / Mills
Base Material	Carbon Steel (API 5L Standard)
Grade	X56 (L390)
Standard	API 5L PSL1 / PSL2, ISO 3183
Size Range	10.3 mm – 2032 mm OD (per supplier)
Wall Thickness	Sch 5 to Sch 160, XXS (varies by OD)
Length	Single Random, Double Random, or Cut Lengths
End Finish	Plain End (PE), Beveled End (BE), or Threaded
Form	Seamless, ERW, LSAW, or SAW
Applications	Oil & Gas Pipelines, Water Transport, Construction, Industrial Piping

Chemical Composition (Base Carbon Steel)

Element	Content (%)
Carbon (C)	0.22 – 0.28 Max (depends on PSL & process)
Manganese (Mn)	1.40 Max
Phosphorus (P)	0.025 – 0.030 Max
Sulfur (S)	0.015 – 0.030 Max
Vanadium (V)	≤ 0.05 (PSL2 variants)
Niobium (Nb)	≤ 0.05 (PSL2 variants)
Titanium (Ti)	≤ 0.04 (PSL2 variants)

Mechanical Properties

Property	Value
Yield Strength (min)	390 MPa (56,600 psi)
Tensile Strength (min)	490 MPa (71,100 psi)
Elongation	≥ 20% (varies by OD and process)
Impact Resistance	PSL2 – High toughness at low temperatures

Dimension Chart (Nominal)

Nominal Pipe Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Length
1/2"	21.3	2.77	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
24"	609.6	18.25	Up to 12 m

Equivalent Grades

Standard	Grade
ASTM	A106 Grade B, A53 Grade B
API	5L Grade B, X42, X52
ISO	ISO 3183 L390
EN	EN 10216 / EN 10224
DIN	St 37.2 / St 52.3

Equivalent Standards

Standard	Description
API 5L	Specification for Line Pipe
ISO 3183	Steel Pipes for Pipeline Transportation Systems

Other Types of Line Pipes

Type	Description
X52 / X60 / X65 / X70	Higher strength grades for long-distance or high-pressure pipelines
Seamless, ERW, LSAW	Different forming processes for various applications
PSL2 Variants	X56N, X56Q, X56M – improved toughness and chemical control

Finally, in key industrial belts and port-linked zones — Kochi, Thiruvananthapuram, Mangalore, and major petrochemical hubs like Dahej, Vilayat, Somnath, Narmada, Ankleshwar, Navsari, Valsad, Rajpipla — Riddhi Siddhi Impex’s role as an API 5L X56 Spool domestic supplier is especially important. Their ability to deliver large, quality-assured spool assemblies helps EPC contractors execute large pipeline contracts efficiently, with reduced import dependency and strong local support..

Frequently Asked Questions (FAQs)

Q1: What are the common applications of API 5L X56 Spool?

A1: API 5L X56 Spools are widely used in oil and gas pipelines, water transportation, construction projects, and industrial piping systems requiring medium to high pressure service.

Q2: Can API 5L X56 Spools be supplied in custom sizes?

A2: Yes, manufacturers and suppliers like Riddhi Siddhi Impex provide API 5L X56 Spools in various diameters, wall thicknesses, and lengths according to project specifications.

Q3: What standards do API 5L X56 Spools comply with?

A3: API 5L X56 Spools comply with API 5L PSL1 / PSL2, ISO 3183, and other equivalent standards ensuring quality, chemical composition, and mechanical properties.

Q4: Are API 5L X56 Spools suitable for low-temperature environments?

A4: Yes, PSL2 variants of X56 grade provide enhanced toughness and impact resistance, making them suitable for low-temperature and harsh environmental conditions.