ACCOMMODATION OF LIFTING MOVEMENTS

To accommodate larger lifting movements, Rattay stainless steel metal hoses are installed in the 180 degree elbow. To calculate the required hose length, proceed as follows:  

9.1.1 Installation plan

9.1.1 Einbauschema 180°-Bogen senkrecht Bewegung: senkrecht

180° elbow vertical
Movement: vertical

E mm installation distance
NL mm total length of the metal hose
r mm installation radius
l1 mm 5 · DN Reserve for balancing assembly inaccuracies
l mm length of a sealing part. To calculate NL, h1 and h2 the length of the longest connection parts must be used.
a mm total travel
h1 mm maximum height of the 180° elbow
h2 mm minimum height of the 180° elbow

Example 1

Example 1

Example

Rattay stainless steel corrugated hose DN 40 Type HR I/S, on both sides screw connections made of stainless steel, Fig. 114.

Operating data

  • Lift vertical a = 300 mm
  • Installation radius r = 400 mm (310 mm min.)

Calculation

l = 95 mm

l1 = 5 · 40 = 200 mm

NL = 400 · w300 durch 2 + 2 · 95 + 200 = 1,796 mm (Order length NL = 1,800 mm)

h1 = 400 + 300 durch 2 + 95 + 200 durch 2 = 745 mm

h2 = 400 + 95 + 200 durch 2 = 595 mm

9.1.2 Installation plan

9.1.2 Einbauschema 180°-Bogen senkrecht Bewegung: waagerecht

180 elbow vertical
Movement: horizontal

E mm installation distance
NL mm total length of the metal hose
r mm smallest bending radius for frequent movements
l1 mm 5 · DN Reserve for balancing assembly inaccuracies
l mm length of a sealing part. To calculate NL, h1 and h2 the length of the longest connection parts must be used.
a mm total travel
h1 mm maximum height of the 180° elbow
h2 mm minimum height of the 180° elbow
DN mm nominal width of the metal hose

Example 2

Beispielberechnung

Example

Rattay stainless steel corrugated hose DN 25 Type HR I/S, on both sides screw connections made of stainless steel, Fig. 107 c.

Operating data

  • Lift horizontal a = 250 mm

Calculation

l = 85 mm see dimension table connection parts

r = 205 mm see hose table

l1 = 5 · 25 = 125 mm

NL = 205 · w + 250 · 1.57 + 85 + 125 = 1,331.2 mm (Order length NL = 1,400 mm)

h1 = 250 + 250 · 0.75 + 85 + 125 durch 2 = 550 mm

h2 = 205 + 250 durch 2 + 85 + 125 durch 2 = 447.5 mm

9.1.3 Installation plan

9.1.2 Einbauschema 180°-Bogen senkrecht Bewegung: waagerecht und senkrecht

180° elbow vertical
Movement: horizontal and vertical

E mm installation distance
NL mm total length of the metal hose
r mm smallest bending radius for frequent movements
l1 mm 5 · DN Reserve for balancing assembly inaccuracies
l mm length of a sealing part. To calculate NL, h1 and h2 the length of the longest connection parts must be used.
a1 mm total travel horizontal
a2 mm total travel vertical
h1 mm maximum height of the 180° elbow
h2 mm minimum height of the 180° elbow

Example 3

Beispielberechnung

Example

Rattay stainless steel corrugated hose DN 32 Type HR I/S, on the one side a screw connection made of stainless steel, Fig. 107 c, on the other a side screw connection made of stainless steel, Fig. 107 b.

Operating data

  • Lift horizontal a1 = 150 mm
  • Lift horizontal a2 = 250 mm

Calculation

l = Imax = 95 mm see dimension table connection parts (for AS 51, AS 55 only 84 mm long)

r = 260 mm see hose table

l1 = 5 · 32 = 160 mm

NL = 260 · w + 150 · 1.57 + 250 durch 2 2 · 95 +160 = 1,526.9 mm (Order length NL = 1,600 mm)

h1 = 260 + 150 · 0.79 + 250 durch 2  + 95 + 160 durch 2 = 678.5 mm

h2 = 260 + 150 durch 2 + 95 + 160 durch 2 = 510 mm

9.1.4 Installation plan

9.1.4 Einbauschema 180°-Bogen waagerecht Bewegung: waagerecht

180° elbow horizontal
Movement: horizontal

If installed horizontally, a support for the metal hose, e.g. a supporting mould or roller, must be attached.

E mm installation distance
NL mm total length of the metal hose
r mm installation radius
l1 mm 5 · DN Reserve for balancing assembly inaccuracies
l mm length of a sealing part. To calculate NL, h1 and h2 the length of the longest connection parts must be used.
a mm total travel
h1 mm maximum height of the 180° elbow
h2 mm height of the 180° elbow

Example 4

Beispielberechnung

Example

Rattay stainless steel corrugated hose DN 40 Type HR I/S, on both sides screw connections made of stainless steel, Fig. 107 c.

Operating data

  • Lift horizontal a = 200 mm
  • Bending radius r = 350 mm (310 mm min.)

Calculation:

l = 98 mm see dimension table connection parts

l1 = 5 · 40 = 200 mm

NL = 350 · w200 durch 2 + 2 · 98 + 200 = 1,595 mm (Order length NL = 1,600 mm)

h1 = 350 + 200 durch 2 + 98 + 200 durch 2 = 648 mm

h2 = 350 + 98 + 200 durch 2 = 548 mm