CONVOFLEX' STAINLESS STEEL CORRUGATED FLEXIBLE METAL HOSE (GSS)
Convoflex (SS304 / SS304L / SS316 / SS316L / SS321)
SPECIFICATION : BS 6501
Hose & Braid Material :
304 / 304L / 316 / 316L / 321
Heavy wall Innercore for corrosive service. Butt welded Annular Corrugations, close-pitch, tubing.
6mm I.D to 600mm
-200ºC. to + 800ºC. for AISI 321 & 316 -200ºC. to + 420ºC. for AISI 304 & 304L
This hose is suited for any application where working conditions demand one or a combination of any of the following: absolute leakproofness, a high safety factor, extreme temperatures, vibrations, high working pressure and corrosion resistance.
Applicable for cryogenic and chemical transfer, vacuum, super-heated steam, coolant lines, fuel and oil burner lines, petroleum, refrigerants, gases, poisonous media and food stuff.
HOSE SPECIFICATION CHART
|CODE||I.D inches||I.D mm||O.D mm||Working pressure kgf / cm²||Test pressure kgf / cm²||Minimum bend radius mm|
|GSS - 6||1/4||6||14||184||276||90|
For Static pipe work the bend radius can be reduced considerably. For extra high pressure, extra braid can be provided. Consult our Technical Department. For pressure drop estimates, for corrugated metal hose, consult our Technical Department. The above pressure ratings are for fluid & ambient temp. of 30°C.
As the operating temperature of a hose assembly increases, the maximum working pressure of the assembly decreases. Below is a chart showing temperature correction factors for 'CONVOFLEX' Stainless Steel Metal Hose.
TEMPERATURE CORRECTION FACTORS
|(ºC)||Correction Factor||(ºC)||Correction Factor|
|- 200 to 50||1.00||400||0.67|
How to use Temperature Corrections Factor Chart?
- Determine the maximum operating temperature of the application.
- Locate this temperature on the chart and read across to the proper factor.
- Multiply this factor times the maximum working pressure as determined from the Hose Specification Chart.
- This answer is your maximum Safe Working Pressure at that Elevated Temperature.
ADVANTAGES OF FLEXIBLE METALLIC HOSE
- High physical strength.
- Suitable for elevated temperature (800ºC).
- Fire resistant.
- Good corrosion characteristics.
- Long life (When installed correctly)
- Resistance to penetration & damage.
FLEXIBLE HOSES ARE USED FOR THE FOLLOWING MODES OF MOVEMENT
- Where the Flexible hose is used to connect pipe work out of alignment and remain in static position.
- When the hose is only required to flex occasionally. Such as manual handling.
- When the hose is required to flex continuously, usually on moving machinery.
- High frequency, low amplitude movement, i .e. on a compressor.
PRESSURE - FOUR EFFECTS
System pressure is the first factor considered in selecting a hose or wall thickness. Where significant pressure fluctuations are not present, a standard hose may be selected by choosing one rated at a pressure equal to or greater than your nominal operating pressure.
Pulsating pressure is a continuous rippling pressure superimposed on the operating pressure. If the pulsations are significant it is proper to provide margin in selecting the rated pressure for a standard hose.
Surge pressures usually occur during system start up, shut down, and rapid valve closure. It is proper to consider the possibility of surge pressures and to provide adequate margin.
Logically, increasing pressure requires a heavier wall and braid and tightens the braid grip increasing hose stiffness proportionately. As covered in the vibration section however, the tightening of the braid is valuable in controlling vulnerability to vibration by providing necessary damping.
HOSE MOTION -THREE TYPES
Occurs when one end of the hose is held fixed and the other is deflected in an arc.
Occurs when one end of the hose is fixed and the other end is offset but remains parallel to the fixed end. Do not allow this motion to stretch the hose. Use a stress relief loop or equivalent to provide slack.
Occurs when one end of the hose is held fixed and the other end of the hose is deflected along the axis of the hose. This type of motion should only be applied to unbraided annular hose or to braided hose where a stress relief loop or offset is provided so that the motion is only locally axial and the hose is not stretched or compressed.