5.2 FLEXTERM CORPORATIONS FLEXIBLE ARMOURED HOSES

Our expert team has studied the production of armoured flexible hoses since 1984 that was developed and can be purchased from consigment stores from 1993., in compliance with the national demands, assuring fast, adaptable service, advantageous price and keeping the high technology standard.

The base og flexible gas quintessential, parallel tape armoured hoses is 18/9 chrome nickel alloy, austentic, non-corrodible corrugated hoses that is a Berghöfer products. The parallel types are made of length welt alloy steel. The waves are parallel with eachother, that is where it name was given from.

The armoured hoses made by FLEXTERM are made in „-5”nominal diameter /12-125 m internal diameter/, and for 8 – 0, 5 bar nominal pressure.

The armoured hose can be protected with a non-corrodible wire-cloth, that gives increased pressure stand-up until 90 – 20 bar by the mechanical protection.

The length of the armoured hoses ranges from 250 mm until according to the request of the customer.

Qualification

The producer examines every and each flexible armoured hose for compactness and after welding and brazing. This is done with air under water. This compactness examination suits 10-5 mbar and l/s quality.

The B. M. I. – TÜV Bayern Quality Controlling Institute’s application permission no.: É. M. I.- É. A. B. – Á – 74/1992.

For taping gas plumbing we have the permission of teh National Energetic and Energy Safety Technology Conservancy.

The permission no.: 10935 – GYE/1991.

If itis requested special armoured hoses can be produced as well.

In this case we recommend a personal negotiation with our company that is ready for individual designing.

5.2.1 Application guide lines

Applitacion area:

These flexible armoured hoses werw sucessful at those areas where the usage of („folded”) hoses, rubber and plastic hoses werw not utilizable.

Theses hoses can be used for transporting:boiling water, steam, condensation, gas, other type corrosion fluids, certain acids, alkali, ammonia, carbonic acid, wine acid, dyes etc.

They are capable for balance assembling unpunctuality, (for example: fitting is gas equipments, convectors, radiators etc.) building –up flexible bendable connections. Apart from this it can be used for insulating vibration of some machines and equipments (compression pump, compressor, etc.).

The armured hoses that are for vibration absorption assures 50 – 80 % absorption.

Application conditions

These flexible armoured hoses can be used according to the given technical data in schedule until 20ºC operation temperature. Taking to consideration the material of the hose the allowable biggest temperature is 600ºC, but until this temperature the characteristics are changing according tho the heat agent. Of courese at the maximal allowable operational temperature the allowed tempereture stress to the connectig equipments has to be taken to consideration as well.

Apart from this has to be taken to consideration that in case of transporting corrosion agent the high temperature increases the corrosion activity.

Attention!

The material of the flexiblearmoured hose is 18/9 austenitic chrome nickel alloy resists the atmophere, the oxidant-, sal and acidic agents, but does not resists the not oxidant agents.

Connection units:

As the base assortment the following schedule gives if the hollander or the straight screwed connectors are recommended at the end of the hoses (to avoid the torsion activity).

Operational circumstances taking to consideration at the usage of flexible armoured hoses:

In the following schedule the given technical operetional pressure und radiuss of curvature because of its wide-ranging can only be guide line, majority they are proceed by the static stress and at room temperature (20ºC).

The pressure rate has min. threefold safety in proportion to disruptive pressure.

The radius of curvature can be smaller than the data given in the schedule in case of onefold bending and strong dislocation.

The different operational circumstances (for example: pulsating and bumping strain, type of movement, higher operational temperature, etc.) against the material of the hose represents supplemental strain. These impacts has to be taken to consideration according to the following schedula and diagram in the interst of operational safety and duration of life.

5.2.2 Calculation of the allowable technological pressure:

Pop. allow = PT x ft x fdyn

 

Pop. allow : allowed operational stress

PT : operational pressure according to the schedule

f t: safety rate in case of increased temperature

fdyn : safety rate in case of dynamic stress

Allowed radius of curvature:

RT : radius of curvature according ti the schedule

Rdyn : radius of curvature in case of dinamyc stress

Safety rate in case of dynamic stress

ºC

X10CrNiTi189

(1,4541)

X10CrNiMo1810

(1,4570)

SSt4

(1,0337)

CuZn15

(2,0240)

CuSn2

(2,1010)

CuSn6

(2,1020)

20

1

1

1

1

1

1

100

0,86

0,83

0,79

0,83

0,83

0,83

150

0,81

0,78

0,74

0,75

0,77

0,78

200

0,76

0,74

0,70

0,68

0,72

0,73

250

0,71

0,69

0,61

 

0,66

0,69

300

0,67

0,65

0,50

 

 

 

350

0,64

0,63

0,44

 

 

 

400

0,62

0,61

0,33

 

 

 

450

0,59

0,59

 

 

 

 

500

0,57

0,57

 

 

 

 

550

0,54

0,54

 

 

 

 

600

0,50

0,50

 

 

 

 

 

Safety rate in case of dynamic stress

Flow* Movement

Without vibration,
slow movement

Slow movement,
frequent equivalent movemet

Strong vibration rhytmical
continued movement

Intermittent or slow equable flow

1

0,80

0,40

Pulse and fluctuant flow

0,80

0,64

0,32

Rhytmical and sussultorial flow

0,40

0,32

0,16

 

Bigger flow than*5 x 104 Reynolds’ number can cause damaging turbulent activyty in the waved wall hose!

Ask our technological department.

Fitting in example:

The TUBOFLEX alloy steel flexible armoured hose, parallel waves, medium wall, medium wave with one line rope NA25 built in with 300C. Liable to small vibration and frequent equivalent movement type – pulse – and fluctuant flow.

Important!

Bigger flow than*5 x 104 Reynolds’ number can cause damaging turbulent activyty in the waved wall hose!

Ask our technological department.

PT = 70 bar, RT = 155 mm, ft300 = 0, 67, fdyn = 0,64

Pop. allow = PT x ft x fdyn

Pop. allow = 70 x 0, 67 x 0, 64

Pop. allow = 30 bar

5.3 SETTING IN GUIDE-LINES AND CYNOSURES

Calculations

The hose has to be fit in without torsion.

Both of the abutter has to be in one level.

HORIZONTAL STROKE MOVEMENT

 

VERTIKAL STROKE MOVEMENT

 

90 o ív

 

The tube bended hard in 90o arch,
as vibration-, noise reducer.

(For little vibration and big frequency).

 

R = Radius of curvature

La = Length of abutter

l1 =max. height

l2 = min. height

e = building distance

s = stroke movement

a = srock length

NL = nominal lenght

 

 

SETTING IN GUIDE – LINES AND CYNOSURES

Uncorrect and correct arran ement

it can not be drag down

but winding

not winding

but building in without torsion

not too short
but leaving enough building in leght

not over – extending
but building in the hose
with deflect

can not be moved differently from the building in level
but only in the building in level

it is not allowed that it becomes bent from its own weight
it has to be hold up with an underlay

can not take too big movements
in strating building in, but only in U –shaped building in

Can not be connected in a pushed away connection point
But they have to be brought in ove level

cat not be ower bended at hanging
but using truckle

not overbending it at the end of the tube, but building in an inflexible tube

cat not take axial movements, but the hose has to be builit in squarely to the direction of the movement

individual hoses can not take movements from different directions, bot only in squarely to direction

can not deflect one-sidedly, but it has to be leaded in the middle

he axial movement is not allowed, but the building in has to be squaerly to the axis of the hose

there sould not be too big laterial movement, the building in has to be done with 90 arch

can not be twisted arond at movement, but taking the movement only in the level of the bending (without torsion)

not over bending the end hose, but deflecting with arches

arbitrary hose lenght can not be used, but defining the exact lenght

not dimensioning it too long, but defining the exact lenght

no twinsting at a non allowed method, but bending it at the level movement withoud torsion