ASME Industrial Pressure Vessels

Tan Long specializes in the custom design, manufacturing, and statutory certification of industrial refrigeration pressure vessels for NH3 (Ammonia) and Halocarbon (Freon) refrigerants compliant with ASME Section VIII and TCVN 8366:2010. Our product line includes high-pressure receivers, low-pressure surge drums, two-stage intercoolers, multi-stage oil separators, and refrigerant pump-out units.

ASME Industrial Pressure Vessels: ASME pressure vessels manufactured by Tan Long include high-pressure receivers, oil separators, intercoolers, and NH3 accumulators. Designed under ASME Sec VIII Div 1 rules, 100% of welds undergo NDT ultrasonic radiography testing and hydrostatic pressure validation.

In industrial ammonia (NH3) and halocarbon (Freon) refrigeration systems, pressure vessels operate under continuous differential pressures from vacuum to 28 bar. Tan Long engineers pressure vessels strictly compliant with ASME Section VIII and TCVN 8366:2010. Pressure vessel failure represents a catastrophic industrial hazard. Tan Long Pressure Vessels utilize normalized cryogenic A516 Gr.70 steel plates, with 100% radiographic X-Ray inspected seams. Hydrostatic proofing and non-destructive examination guarantee zero-defect structural integrity.

Bình Áp Lực Industrial Refrigeration Systems: Thép A516 Gr.70 Kiểm Định NDT 100% — Ammonia surge drum and high-pressure receiver fabricated at Tan Long mechanical engineering works.

Tan Long Factory Standard Technical Specifications Matrix

Fabrication Volume / Capacity	0.5 m³ to 30 m³ (Per Project Specifications)
Design Working Pressure	1.8 MPa to 2.5 MPa (18 - 25 bar)
Hydrostatic Proof Test Pressure	2.7 MPa to 3.75 MPa (27 - 37.5 bar)
Vessel Shell Body Material	Cryogenic Boiler-Grade ASTM A516 Gr.70 Steel or SS304
Dished End Cap Material	2:1 Semi-Ellipsoidal Hot-Pressed Heads with Uniform Thickness
Weld Seam Quality Inspection	100% Radiographic X-Ray & Ultrasonic NDT Testing
Integrated Safety Appurtenances	Dual Safety Relief Valves with 3-Way Changeover, Level Sight Glass, Oil Drain Valve
Statutory Safety Certification	Center for Occupational Safety Certified Inspection Permit

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1. Core Industrial Refrigeration Pressure Vessel Classifications

Tan Long manufactures the complete range of pressure vessels for industrial refrigeration thermodynamic cycles:

• High Pressure Receiver: Stores high-pressure liquid refrigerant from evaporative condensers, stabilizing mass flow across fluctuating facility cooling loads.

• Low Pressure Accumulator / Surge Drum: Separates liquid droplets from suction return vapor before compressor inlet, preventing hydraulic liquid slugging damage to rotors and pistons.

• Two-Stage Intercooler: Subcools high-pressure liquid and desuperheats intermediate booster discharge vapor in two-stage systems, elevating system COP by 20%.

• Oil Drain Pot / Recovery Vessel: Safely collects and drains lubricated oil from low-temperature vessels without venting refrigerant to the atmosphere.

2. Rigorous Fabrication & Quality Control Workflow

Every Tan Long pressure vessel undergoes 5 rigorous quality control verification stages:

1. Verification of metallurgical and chemical mill test certificates for imported boiler-grade steel plates.

2. High-precision CNC plasma beveling and 4-roll hydraulic shell plate rolling.

3. Submerged arc welding (SAW) with 100% Non-Destructive Testing (NDT) radiographic X-Ray inspection on all seams.

4. Hydrostatic proof testing at 1.5x design pressure, followed by 24-hour dry nitrogen pneumatic leak hold.

5. Abrasive blast surface profiling to Sa 2.5 cleanliness and multi-coat marine-grade epoxy painting.

3. Uncompromised Safety & Certified Compliance for Food Factories

Tan Long pressure vessels feature dual safety relief valves with three-way changeover manifolds, allowing valve testing and calibration without system depressurization or downtime.

Competitive Advantages & Market Comparison Matrix

Technical comparison between genuine Tan Long refrigeration equipment manufactured at Duc Hoa 1 Industrial Park versus substandard market alternatives:

Tan Long Equipment Advantages

✓ ASTM A516 Gr.70 normalized carbon steel exhibits high Charpy V-notch impact toughness at -46°C, eliminating brittle fracture risks.
✓ Submerged arc automatic welding (SAW) with 100% radiographic X-Ray inspection detects and eliminates internal slag voids or microcracks.
✓ Complete statutory safety inspection dossiers, mill test certificates, and vessel passports supplied for regulatory compliance audits.
✓ Standard vessel models stocked at Duc Hoa 1 facility, shortening delivery lead times to just 3-5 days.

Drawbacks of Manual / Used Imported Systems

✗ Low-cost workshops frequently substitute structural CT3/SS400 carbon steel, highly vulnerable to catastrophic brittle fracture under cold sub-zero pressures.
✗ Manual hand welding without radiographic X-Ray testing leaves severe slag inclusions and porosity prone to bursting under pressure.
✗ Lacks dual safety relief assemblies, relying on a single valve that creates severe safety hazards during periodic calibration.
✗ Forged or unverified inspection paperwork lacking legitimate mill test certificates or ministry registration permits.

Frequently Asked Questions (FAQs) by Engineers & Investors

Q1: Do Tan Long pressure vessels include full statutory government safety inspection documentation?

100% of pressure vessels manufactured by Tan Long include complete statutory documentation: Vessel dossier, fabrication drawings, material test certificates, NDT X-Ray test films, and safety registration permits.

Q2: What is the mandatory periodic inspection interval for industrial refrigeration pressure vessels?

Under Vietnam industrial safety regulations, newly commissioned pressure vessels receive an initial 3-year statutory operating permit, with periodic 2-year re-inspections thereafter.