Nord stone

Double-Pipe Heat Exchanger (DPHE)

Double-Pipe Heat Exchanger

Double-Pipe Heat Exchanger (DPHE)

A Double-Pipe Heat Exchanger (DPHE) is one of the most fundamental and efficient heat-transfer devices used in process industries where compact design, high-pressure capability, easy maintenance, and reliable performance are required.

Designed with two concentric pipes—one carrying the hot fluid and the other the cold fluid—this type of exchanger ensures efficient heat exchange through simple, robust construction.

At NORDSTONE, we engineer and manufacture Double-Pipe Heat Exchangers that comply with ASME Section VIII Div.1, TEMA, and API standards, ensuring maximum reliability, safety, and long-term operational performance.

What is a Double-Pipe Heat Exchanger?

A Double-Pipe Heat Exchanger consists of:

  • •

    An inner pipe (core tube) that carries one fluid

  • •

    An outer pipe (shell) that carries the second fluid

  • •

    Return bends, expansion loops, or hairpin configurations for multi-pass flow

  • •

    High-integrity supports, saddles, and inlet/outlet headers

The fluids typically flow in counter-current, maximizing thermal efficiency and temperature gradients.

Industries Served

Oil & Gas
Upstream/Midstream/Downstream
Chemical
& Petrochemicals
Power & Energy
Generation & Distribution
Marine & Offshore
Platforms & Vessels
Water Treatment
& Desalination
Food & Beverage
Processing
Pharmaceuticals
Manufacturing

Key Features of Our Double-Pipe Heat Exchangers

✔ Compact, Robust Design
  • Ideal for smaller heat-duty applications
  • Space-saving layout (straight or hairpin design)
  • Suitable for localized or skid-mounted systems
✔ High Pressure & Temperature Capability
  • Handles high-pressure differentials better than shell-and-tube exchangers
  • Suitable for viscous fluids, steam, hydrocarbons, refrigerants, acids, and utility services
✔ Modular & Scalable
  • Units can be connected in series or parallel
  • Easily expandable for increased heat duty
✔ Easy Maintenance
  • Straight tubes allow quick inspection and cleaning
  • No complex tube-bundles or baffles
✔ Corrosion-Resistant Construction

Materials available based on process requirement:

Carbon Steel (CS) SS304/304L SS316/316L Duplex / Super Duplex Copper Cu-Ni Alloys Titanium Inconel Hastelloy

Typical Applications

Double-Pipe Heat Exchangers are widely used in:

Oil & Gas
  • Crude, condensate, and gas cooling
  • Jacket water cooling
  • Fuel oil heating
  • Utility and lube oil heat transfer
Chemical & Petrochemical Industry
  • Heating/cooling of process fluids
  • Batch reactor temperature control
  • Heat recovery loops
Water Treatment & Desalination
  • Cooling or heating of brine, feed water, effluent streams
Pharma & Food Processing
  • Hygienic heat transfer
  • Temperature control of sensitive media
HVAC & Utility Systems
  • Hot water generation
  • Steam or chilled water applications

Design Capabilities

Our DPHE units are designed as per the following engineering considerations:

Thermal Design
•

Counter-flow arrangement for maximum effectiveness

•

Heat duty ranging from 0.1 kW to 2,000 kW

•

Optimized LMTD, U-values, and pressure-drop performance

•

Single, double, or multi-pass configuration

Mechanical Design
•

Designed as per ASME Sec. VIII Div.1

•

TEMA Class R, B, or C standards

•

Finite Element Analysis (FEA) for critical components

•

Stress analysis for high-pressure service

Operating Conditions
300 bar
Pressure Rating
-50°C to +450°C
Temperature Range
Customizable
Project Specifications

Types of Double-Pipe Heat Exchangers Offered

1. Hairpin Heat Exchangers
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U-shaped design

✓

Suitable for high heat transfer coefficients

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Compact and easy to install

2. Straight Tube Double-Pipe Exchangers
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Simple design

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Best for clean fluids and low fouling

3. Jacketed Pipe Heat Exchangers
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Used where fluids need to be isolated without mixing

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Excellent for viscous or hazardous fluids

Quality & Inspection

Each heat exchanger undergoes stringent testing, including:

Hydrostatic Testing

Pressure testing for leak detection and structural integrity

Pneumatic Testing

Air pressure testing for sensitive applications

Material Traceability

MTC – EN 10204 3.1 certification

Non-Destructive Examination
RT UT PT MT
Welding Procedures

WPS & PQR Qualified Welding

Why Choose NORDSTONE?

✓
Over 20+ Years of Expertise

In pressure vessels & heat transfer equipment manufacturing

✓
Fully Certified Facility

Capable of ASME U-Stamp fabrication with complete traceability

✓
Advanced Engineering

3D modelling & thermal simulations for optimized designs

✓
Fast Turnaround

Efficient manufacturing with global delivery capabilities

✓
Full Compliance

With international codes, customer specifications, and project QA/QC requirements

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Ready to Discuss Your Double-Pipe Heat Exchanger Requirements?

Contact our engineering team for custom solutions and quotations.

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