High-Pressure Tubes

• ALLFI HP tubing in seamless cold-drawn stainless steel for maximum corrosion resistance: ideal for all high pressure applications.
• Quality and safety at extreme pressures.
• Manufactured to ALLFI´s strict specifications concerning material strength, pressure testing, bore quality, dimensions, corrosion resistance and analysis for the safe application in extreme high pressure usage.
• Guaranteed reliability based on strict inspection tests with material and inspection certificates.
• HP tubings are available in lengths of approx. 6 – 7 m.
• ALLFI HP tubing is also available in special lengths and as straight or custom bent special nipples.
• For cyclic pressures and alternating loads we recommend our autofrettaged tubings and nipples.
• The tubing dimensions match with the ALLFI high pressure programm of valves and fittings.
• HP tubings in W.Nr. 1.4301 and for a working pressure of 4150 bar are available from stock. Other materials and metric tubing on request.
• For higher operating pressures or pressure fluctuations we recommends the use of the material HP160.
• Other dimensions are available on request.

• Autofrettaged tubings and tubing arcs (see product overview)

• Tube treatment and bending tools (see Product overview)

HP-Nipples off HP-Tubes

• Precisely bent nipples are easily mounted and lead to tensionfree connections.
• High mechanical strength due to cold forming.
• Nipples in various standard lengths or according to your individual needs are available.
• Straight and 90°-nipples are available from stock.

• Minimal bending radius – outer diameters (AD):
  AD 6.35mm (1/4"): 25mm
  AD 9.52mm (3/8"): 50mm
  AD 14.30mm (9/16"): 75mm
• Max. operating pressure corresponds to ALLFI HP tubings.

• Autofrettaged nipples (see product overview)

HP-Tubing Coils & bends

• Production of customer-specific coiled tubing.
• Tube bends and elbows can be produced from workshop drawings.
• Precision bends facilitate installation.
• Complete pipe system for waterjet cutting machinery.

• Tubing coils can be produced from 1/4" (6.35mm ext. dia.) high-pressure tubes, also 3/8" (9.52mm ext. dia.) and 9/16" (14.30mm ext. dia.) bends and radii can be supplied.

• Autofrettaged tube coils (see product overview)
• On spot tubing for 2D and 3D plants
• Tubing for cutting robots

Protection tubes for HP-Tubing

• Protection of envirement at leaks in the tubework and spray emerges.
• Low cost solution.

• Solutions with metal, metalplast and polyflex tubes; matching the dimensions of ALLFI HP-tubings.

Autofrettage

The requirements for high-pressure components for waterjet cutting continuously increase due to higher operating pressures and pressure cycles. At the same time, these components should have a longer lifetime for reliable maintenance cycles. One promising method to achieve this is the post-processing of components using Autofrettage pressure.

Definition

Autofrettage is French and means Even shrinkage. In our case, this means the deliberate introduction of residual stresses in thick-walled components by a high internal pressure, the flow pressure must exceededs.

Advantages

• The plasticising on the inside wall causes a micro defuse manufacturing conditional micro notches.
• Unequal power distribution over the cross-section of bent HP-Tubes are eliminated on the inside fiber.
• Increasing the operational safety.
• Increasing the endurance strength between 50% and 150%.
• The life of autofretted components subject to a lower scattered area.

Application

ALLFI operates an HP-Autofrettagepumpe for pressures up to 14'000 bar. Which are achieved allowing the Autofrettage effect even at the highest-quality materials. At durability problems, or the demand for increasing the durability, we recommend you to leave us do the autofrettage fo HP-Tubes and HP-Component. We will be glad to futher advise you.