6-Stage Technical Production Sequence
Our 6-step manufacturing workflow combines raw material verification, automated cold forming, zero-porosity welding, thermal stress relief, and 100% pressure testing under BIS and PESO supervision.
JSW Prime Steel Sourcing
IS 6240/15914 certified deep-drawing coil steel procured exclusively from JSW Steel with 100% mill test verification.
Shearing & Deep Drawing
Automated hydraulic presses blanking and forming precision cylinder cups with 4.0mm to 5.6mm wall thickness.
SAW / MIG Welding
High-precision Submerged Arc Welding (SAW) and automatic MIG welding ensuring zero-porosity circumferential joints.
Normalizing & Stress Relieving
Full thermal stress relieving in computer-controlled batch furnaces to eliminate residual stress and restore grain ductility.
Porous Mass Integration (DA)
In-house monolithic calcium silicate mass baking achieving 90%–92% porosity and ≥22 kgf/cm² crushing strength.
100% Hydrostatic & Leakage Testing
Mandatory expansion testing up to 250 kgf/cm² and pneumatic bubble leakage testing under direct PESO inspection.
Quality Assurance & Material Security
In-house process control eliminates third-party manufacturing risks, ensuring full material traceability.
Primary JSW Steel Coil Hedging
End-to-end traceability from primary steel mill coils to finished cylinder dispatches, preventing material substitution.
BIS, PESO & TÜV SÜD Batch Clearance
Statutory verification at key production milestones ensuring unbroken compliance with ISO 9001:2015 management standards.
Automated Deep Drawing & Hydraulic Blanking Systems
BTPS utilizes heavy-duty double-action hydraulic presses to draw JSW prime steel blanks into cylindrical cups with precise wall uniformities.
Hydraulic Blanking & Cupping
Prime JSW steel coils are sheared into precise circular blanks and cold-drawn into seamless cup halves. Controlled die clearances maintain uniform wall thickness (4.0mm to 5.6mm) to resist intense internal pressures.
IS 6240 / IS 15914 Cold FormingEdge Trimming & Bevel Preparation
Drawn cup edges are automatically trimmed and beveled to standard joint profiles. Precise bevel geometry allows 100% full-penetration submerged arc welding along circumferential seams.
Zero-Gap Alignment ControlComputerized Batch Furnace Normalizing & Stress Relief
Deep drawing and welding introduce severe localized work hardening and thermal stresses within the steel matrix. BTPS operates continuous heat-treatment furnaces to normalize every cylinder batch.
Thermal cycles soak vessels at normalizing temperatures before controlled cooling. This process refines steel grain structures, relieves seam stress, and guarantees high impact resistance under field conditions.
Thermal Quality Metrics
- Zero Residual Stress: Restores uniform grain structure across drawn cups and seam welds.
- Ductility Restoration: Prevents brittle cracking during mandatory 250 kgf/cm² volumetric expansion tests.
- Cyclic Fatigue Strength: Ensures vessel longevity across thousands of field pressure fill cycles.
- BIS Calibration: Furnace temperature zones are routinely audited and logged for BIS lot clearances.
Grit Blasting, Thermal Zinc Metallizing & Staging
Before receiving final factory clearance, tested shells undergo heavy corrosion protection and precision valve fitment.
Automated Shot/Grit Blasting
Shell surfaces are shot-blasted to remove mill scale, oxides, and weld spatter, establishing an anchor profile for coating adhesion.
Thermal Zinc Metallizing
High-purity molten zinc is thermally sprayed over the steel body to provide sacrificial galvanic protection against aggressive industrial environments.
Industrial Enamel Coating & Stencil
Coated with heavy-duty polyurethane/enamel paint according to gas color-coding standards, followed by tare weight and serial stenciling.
Manufacturing Sequence & Process Engineering Guidelines
Factual response guidelines regarding stress relief, porous mass baking, and PESO inspection.
Why is thermal stress relieving necessary during the 6-step manufacturing workflow?
Why is thermal stress relieving necessary during the 6-step manufacturing workflow?
Thermal stress relieving in computerized batch furnaces eliminates residual mechanical stresses introduced during deep drawing and welding. This process restores microstructural ductility to JSW steel shells, ensuring they safely withstand cyclic filling pressures up to 70 kgf/cm².
How is the 90–92% porous mass integrated into Dissolved Acetylene cylinders?
How is the 90–92% porous mass integrated into Dissolved Acetylene cylinders?
During Step 05, a proprietary slurry of calcium silicate, asbestos-free reinforcing fibers, and water is injected into the cylinder shell, then cured in high-temperature baking ovens to form a solid porous monolith with 90%–92% porosity and ≥22 kgf/cm² crushing strength.
What pressure testing protocols are mandated prior to final dispatch?
What pressure testing protocols are mandated prior to final dispatch?
Every cylinder undergoes 100% hydrostatic expansion testing in automated water jackets to verify volumetric permanent expansion limits, followed by 100% pneumatic bubble leak testing at working pressures under direct PESO inspection supervision.