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SS Corrugated Bellow Hose assembly

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SS Corrugated Bellow Hose assembly

Stainless steel annular corrugated metallic flexible hoses are manufactured in austenitic steel ANSI 321, 316, 316L & 304 grades conforming to BS 6501, Part-1. The annular corrugated metallic hose body provided the flexibility and pressure tight core of the assembly. Highly flexible close –pitch hoses are manufactured for special applications

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SS Corrugated Bellow hose - Braiding

When pressure is applied, unbraided hose tends to elongate axially; to restrain this, an external layer of SS wire braid is provided. The braid also makes the assembly pressure compatible. Sometimes two or even three layers of braiding are provided for high pressure applications. The braiding is highly flexible and follows the movement of the hose. The braid is normally manufactured in SS 304 wire. However SS 316 and 321 braids can also be manufactured. We also supply wire braid in different configurations as per customer specifications.

Advantages of Stainless Corrugated bellow hoses

  • High physical strength in addition to  light weight
  • Suitable for wide range of temperature  (-270° C to + 700°C)
  • It has excellent  corrosion resistance. The hose also has good resistance to fire, moisture, abrasion and penetration.
  • The hose absorbs vibration and noise from pumps, compressors, engines etc.
  • Compensates for intermittent or constant movement.
  • The hose compensates whenever there is  thermal expansion of contraction of the piping.
  • Any misalignment problems can be corrected
  • It is a flexible, quick and most preferred alternative where rigid piping is done in difficult locations of a plant.

End Fittings of a Corrugated Bellow Hose Assembly

The End fittings of a corrugated hose assembly can be any of the following types :

Fixed Male End Fitting

Fixed Female End Fitting

Male Union Type End Fitting

Female Union Type End Fitting

Plain Stub End Type

Fixed Flange Type End Fitting

Swivel Flange Type End Fitting

Camlock Coupling Type End Fitting

The End Fittings which can be any of the above depending on the application of the hose is generally fused onto the hose by means of TIG welding which is the most suitable welding type for SS corrugated Bellow hoses.  This again is a skilled process and can be done only by skilled and experienced welders.

FIXED MALE (HEXAGON)HF01FEMALE SWIVEL NUT (UNION) TYPE HF02FIXED FEMALE TYPE HF03900
FIXED MALE (HEXAGON)
HF01		FEMALE SWIVEL NUT (UNION) TYPE
HF02		FIXED FEMALE TYPE
HF03900
MALE UNION TYPE HF04FEMALE UNION TYPE HF05900 ELBOW FEMALE SWIVEL TYPE HF06
MALE UNION TYPE
HF04		FEMALE UNION TYPE
HF05		90 deg ELBOW FEMALE SWIVEL TYPE
HF06
PLAIN PIPE TYPE HF07WELDING PIPE (STUB) TYPE HF08THREADED PIPE TYPE HF09
PLAIN PIPE TYPE
HF07		WELDING PIPE (STUB) TYPE
HF08		THREADED PIPE TYPE
HF09
CAMLOCK COUPLING TYPE HF10FIXED RF FLANGE TYPE HF11SWIVEL FLANGE WITH STUB END TYPE HF12
CAMLOCK COUPLING TYPE
HF10		FIXED RF FLANGE TYPE
HF11		SWIVEL FLANGE WITH STUB END TYPE
HF12
Nominal Size
DN		Without BraidSingle BraidDouble BraidMinimum Bend Radius
Max. Working PressureTest PressureMax. Working PressureTest
Pressure		Max.. Working PressureTest PressureStaticDynamic
InchmmKg/cm2Kg/cm2Kg/cm2Kg/cm2Kg/cm2Kg/cm2mmmm
1/464610015016024025100
3/810469013514421640150
1/21234.58012012819250200
5/81634.57010511216850200
3/42023649610215370200
1252350758012090200
1.1/4321.52.340606496110250
1.1/2401.52.330454872130250
25011.528424466175350
2.1/26511.524363857200410
38011.518272842205450
41000.81.216242639230560
51250.60.912182030280660
61500.60.910151624320815
82000.50.7581212184351015

The above values apply only to braided hoses and assemblies at ambient temperature of 20 Deg Celsius. The burst pressure is 4 times of the max. working pressure.

Stainless Steel Corrugated Bellow hoses with SS Braiding are used for diluted or concentrated acids, alkalies, liquid ammonia, nitrogen, hydraulic oil, steam, air & water. These are suitable for high pressure and high temperature application and for corrosive conditions.

Construction of SS Corrugated Bellow Hose : The Inner Corrugation is generally made of  SS 321 and the outer wire braiding is made of  SS 304 wire material

Working Pressure : The working pressure of the SS Corrugated Bellow hose varies from  2300 psi for 1/4″ID hose size  to 90 psi for 8″ID hose size

Size Range of hose  : 1/4″ ID to 8″ ID.

Temperature Range of Hose :   The SS corrugated Bellow hose can be used for a temperature range of     – 196 Deg C to upper side temperature of  + 600 Deg C

Applications of SS Corrugated Bellow Hose assemblies

The SS Braided Corrugated Bellow Hose assemblies are generally used extensively in Refineries , Power Plants , Steel Plants , Nuclear Installations, Fertilizer Industry, Pharmaceutical Industry, Cryogenic Services ,Chemical Industry , Boilers , Paper Plants , Lubrication Systems, Automotive Industry, Steam Hot water Pneumatic Services ,Vacuum Systems ,Air Conditioning & Refrigeration ,Ports & Ship Yards, Defense Industry, Piping, Vibration Absorption ,Railways.

In order to get satisfactory service and long life from stainless steel flexible hose, the hoses assembly should be installed in the proper manner.  Sharp bending the  hose assembly, especially near the end fittings where welding has been done,  mounting of the hose in a twisted and stressed manner and excessive fatigue are main causes of early failure.

Given below is a chart indicating the correct and incorrect modes of installation

INCORRECTCORRECT
Dimension the hose adequatelyTake care that the flexible length is not too short
Dimension the hose adequatelyFlexible length of the hose should not be too short
Avoid excessive bending of the hoseUse pipe bends
Excessive bending of the hose should be avoidedWhere the hose needs to be bent pipe bend fittings should be used
Do not allow the hose to sagUse a support
The length of the hose should not be more so as to allow it to sagSupports for hoses to be used
Do not move the hose obliquely to the installation planeMovement should be along
The hose should not be moved the hose obliquely to the plane of installationMovement should be along the plane of installation
Avoid torsional twist when fittings are not in lineInstall in one plane only
Avoid torsional twist when fittings are not in lineInstall in one plane only
Avoid torsion due to Angular movementsAll movements should be only along the axis of the hose
Avoid torsion due to Angular movementsAll movements should be only along the axis of the hose