Large-diameter, heavy-wall seamless pipes, made in India
DEE Piping Systems manufactures large-diameter, heavy-wall seamless pipes at its dedicated facility in Anjar, Gujarat. With advanced manufacturing capabilities and stringent quality controls, we maintain precise tolerances on both the Outside Diameter (OD) and Inside Diameter (ID) of every pipe we produce.
Our manufacturing expertise is built around three specialized production routes:
- Trepanning (Deep Hole Drilling)
- Counter Boring
- Hot Expansion
These processes enable us to manufacture seamless pipes in sizes and wall thicknesses that have traditionally been difficult to source within India. The result is a reliable supply of high-performance pipes designed for demanding applications across the power, oil & gas, process, petrochemical and subsea industries.
As a trusted provider of piping solutions, DEE has expanded its capabilities to include the production of its own seamless pipes.
At DEE, we are committed to delivering engineered piping solutions that meet the highest standards of quality, performance, and reliability.
At a Glance
- 12,000 MT annual capacity
- 6" to 40" pipe sizes
- Up to 200 mm wall thickness
- 53-acre integrated campus
- ~30 km from Kandla Port
Anjar Seamless Pipe Facility, Gujarat
We commissioned our Anjar seamless pipe plant to serve OEM and EPC companies in India and around the world. The plant combines modern Italian and German machinery, in-house heat treatment and testing, and a skilled engineering team under one roof.
Strategically located, globally connected
The plant is about 30 km from Kandla Port and about 60 km from Mundra Port, two of India's largest gateways. Heavy, oversized pipes reach your site faster, with less handling and lower logistics cost.
One campus, complete piping solutions
The seamless pipe plant shares a 53-acre campus with our Anjar Piping Fabrication Unit. You can source seamless pipes and fabricated spools from one location.
Our Manufacturing Capability
| Manufacturing Route | Size Range | Wall Thickness |
|---|---|---|
| Trepanning / Deep Drilling | 6" – 40" | 9 – 200 mm |
| Hot Expansion | 8" – 40" | 9.53 – 50 mm |
Trepanned / Deep-Drilled Seamless Pipes
These are seamless pipes produced from a solid forged bar or billet by trepanning, a machining process in which a core is removed from the centre using a trepanning tool. Unlike conventional drilling, trepanning removes only an annular ring of metal, leaving a solid core that can often be reused.
Counter-Bored Seamless Pipes
This is a machining operation used to enlarge the bore (inside diameter) at one or both ends of a pipe to a specified depth.
Hot-Expanded Seamless Pipes
This is a manufacturing process in which steel is heated above its recrystallization temperature and then plastically deformed to obtain the required pipe dimensions. this is an efficient choice for large-bore, medium-wall applications.
Why Choose DEE Forged Seamless Pipes?
1. Heavy walls, no compromise:
- Extra-thick walls come easily from heavy-wall forgings.
2. Made to your dimensions:
- OD, ID and length are tailored to your design rather than limited to standard sizes.
3. Precision you can measure:
- CNC machining gives tight dimensional tolerances and a smooth internal surface finish.
4. Soundness from the start:
- Every forged bar is ultrasonically tested before machining begins.
5. Code-recognised manufacturing:
- ASME Code Interpretation BPV II-A-25-13 confirms that pipes machined and drilled from forged bar can be certified to SA-335 and SA-106. The condition is that the finished pipe meets every requirement of the specification.
6. From Forging to Finished Pipe:
- Raw material selection: We use premium forged billets of up to 15 m length from approved European, Indian & Chinese mills, UT-verified for internal soundness.
- Preparation: Annealing, OD turning and shot blasting are carried out as required.
- Trepanning / counter boring: CNC deep-drilling machines create a precise central bore.
- ID finishing: Precision boring and honing bring the pipe to its final ID and surface finish.
- Heat treatment: Normalizing and tempering, quenching and tempering, or annealing is applied to suit service conditions.
- Straightening: A 2,000-tonne hydraulic press keeps the pipes straight.
- Testing and inspection: Each pipe goes through chemical, mechanical, automated UT, hydrostatic, magnetic particle and dimensional checks.
- Finishing and dispatch: Pipes are bevelled, marked, preserved and packed, ready for your site.
World-Class Plant & Machinery
1. Deep drilling / trepanning machines:
- Giana GGB 2500 (Italy): 8" to 40"
- Tacchi FT 70 (Italy): 6" to 18"
2. Heavy-duty lathe:
- Wohlenberg-Hannover E 1000B (Germany): ID boring from 500 to 1,500 mm
3. Honing and grinding:
- Tacchi honing machine (Italy)
- CARD grinding machine (Italy): up to 48"
4. Hot expansion machine:
- Ming Heng YKT 500A
5. Heat treatment:
- Bogie hearth furnace: 13 × 3 × 2 m, 40 T capacity, up to 1,100 °C
- Additional 18 m furnaces
6. Straightening press:
- 2,000 MT hydraulic press
7. Supporting equipment:
- Band saw (40")
- Shot blasting machine (up to 40")
- Hydrostatic test machine (up to 54")
- Pickling plant
- EOT cranes up to 20 T
Quality Built in at Every Step
1. Automated Ultrasonic Testing (AUT):
- 24 independent channels scan for longitudinal flaws, transverse flaws, wall thickness and laminations"
- Pipe range: Ø 6" – 36", wall thickness 10 – 120 mm, length up to 12.5 m"
- Standards: API 5L / 5CT, ASTM E213, ISO 10893, EN 10216"
2. Complete in-house laboratory:
- Universal Testing Machine (1,000 kN)
- Charpy impact testers (ASTM and IS)
- Optical emission spectrometer for chemical analysis
- Vickers hardness tester
- Metallurgical microscopes
- CMM / 3D dimensional survey
3. Certified expertise:
Our team includes metallurgists from IIT Bombay and NDE professionals certified to ASNT Level III and ISO 9712 Level III across UT, RT, MT, PT and VT.
4. Certifications & approvals:
- ISO 9001:2015
- ISO 14001:2015
- ISO 45001:2018
- NPCIL-approved heat treatment furnaces
- ISO/IEC 17025 (NABL) and ISO 19443 in progress
Have a challenging pipe requirement?
Share your size, wall thickness and application. Our engineering team will come back with the right solution.