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HydroSwage®
Haskel International offers a wide range of equipment designed for hydraulic expansion of heat exchanger tubes into tube sheets through the direct application of high internal hydraulic pressure. This equipment constitutes the HydroSwage product line. "HydroSwage®" is a trademark that has become synonymous with the process of hydraulic expansion. This demonstrates how Haskel technology stands as the industry benchmark for hydraulic expansion equipment. Haskel offers more than 30 years of engineering experience in the design and manufacture of hydraulic expansion systems and tooling. Our vision is to provide our customers innovative solutions using hydraulic expansion technology. We constantly explore new processes and develop new products that offer a unique approach to our customers' specific applications and requirements.
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Water pressure from an air driven pumping system is intensified to the desired high pressure. It is transmitted through an 8 foot (2.4 m) small bore, flexible high pressure tube to a lightweight hand-held mandrel holder. A mandrel, which latches into the mandrel holder, directs the pressure to the inside diameter of the tube and is held within an accurately prescribed pressure zone. Pressure is contained within the expanding tube by a soft elastic seal which is supported by a patented elastic backup and expanding segmented steel ring.
Pressure is applied over the full length of the joint in one step. The pressure zone is accurately adjusted which reduces the damaging crevices at the edges of the tube sheet. Stress, crevice corrosion, and metallurgical changes are thus minimised.
HydroSwage expanding with pure water produces clean joints. Lubricant is not forced into the tube surface, and there is no surface flaking or spalling inside the tube.
A smooth transition from expanded to unexpanded areas, along with no change in tube material properties, greatly reduces strain hardening, tube fatigue and stress induced corrosion cracking. Tube wall thickness and tube length change is minimal. Before contact is made with the tube sheet, a small reduction in tube wall thickness and length occurs because a constant volume of tube material is expanded to a larger diameter. However, no change occurs during the high pressure swaging, eliminating the shear strain and loss of seal between tube and tube sheet that is a characteristic of roller expanding.
The HydroSwage cycle is automatic and initiated by the operator button located on the mandrel holder. The tube is filled with clean water at a low pressure, intensified to the higher setting and held for the time required to accomplish a stable plastic condition of the tube. This dwell time is essential to stabilise exotic tube materials. After this pressure is released, water is drained back to the reservoir. All of this occurs in a time period of a few seconds.
Actual pressure at the tube is read on a digital pressure indicator. An adjustable "under" or "over" pressure condition and operating sequence is shown at the control panel and the operator mandrel holder. BCD and Analogue connections are provided for strip chart recorders and printers (optional equipment) for permanent quality control records.
Key Features
Accuracy - The degree of expanding is directly proportional to the pre-set hydraulic pressure.
Repeatability - Each tube is expanded by the same pressure which is held to within a tolerance of ± 1000 psi (69 Bars).
Quality Control - Strip chart recorder or a printer (optional equipment) can be used to record the actual pressure used to swage each tube to a readout accuracy of better than .5% of full operating range.
Safety - No adverse torque reaction on the operator. Swaging pressure is confined within the tube and tube sheet. Automatic shut off if tube mandrel seal is lost.
Ease of Operation - Go/no-go lights alert operator as to the swaged condition of each tube. Since success is determined by pressure, not feel, training time is minimised to a great degree compared to mechanical methods.
Fast - Even the thickest tube sheets are swaged in one step in just seconds. As tool does all the work, no additional operator is needed to pin tube to prevent its movement.
Versatile - One basic system handles all sizes. Interchangeable mandrels accommodate any tube diameter and gauge, and any tube sheet thickness.
End Chasing Leaks - Even in partial re-tubing operations, the accuracy of the HydroSwage process minimises disturbing the seal of adjacent tubes.
No Tube Wall Reduction - Wall thickness or tube length does not change after contact is made with tube sheet therefore, the seating of the tube is not disturbed as swage pressure is increased nor are there metallurgical changes.
Stress Corrosion - Stress corrosion, work hardening and other metallurgical changes are minimised, prolonging tube service life.
Reduced Crevice - Reduces crevice corrosion due to accurate control of tube to tube sheet crevice.
Accommodates Distorted Holes - This is no problem with the HydroSwage process (within allowable tolerances). Uniform hydraulic pressure swages the tube to each hole's configuration.
Full Product Line - In a shop, in the field, or aboard a ship, complete or partial re-tubing, new fabrication, tube setting prior to welding or even sleeving, there is a HydroSwage system for every application.
Robotic Operation - Because of the design and balanced hydraulic principle of operation, the HydroSwage is ideal and easily adapted for robotic operation.
Products
Systems
Typical ApplicationsHydroSwage products are designed and manufactured for use in a wide range of markets and applications:
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Us
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Haskel (Asia) Pte Ltd.
23 Tagore Lane #03-06
Tagore 23 Warehouse Complex
Singapore 787601
Tel: 65-6455-7559
Fax: 65-6455-2841
Email: sales@haskel.com.sg
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What is a HydroSwage®