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
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
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 · 
+ 
+ 2 · 95 + 200 = 1,796 mm (Order length NL = 1,800 mm)
h1 = 400 + + 95 + 
= 745 mm
h2 = 400 + 95 + = 595 mm
9.1.2 Installation plan
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
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 · + 250 · 1.57 + 85 + 125 = 1,331.2 mm (Order length NL = 1,400 mm)
h1 = 250 + 250 · 0.75 + 85 + 
= 550 mm
h2 = 205 + 
+ 85 + = 447.5 mm
9.1.3 Installation plan
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
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 · + 150 · 1.57 + 2 · 95 +160 = 1,526.9 mm (Order length NL = 1,600 mm)
h1 = 260 + 150 · 0.79 + + 95 + 
= 678.5 mm
h2 = 260 + 
+ 95 + = 510 mm
9.1.4 Installation plan
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
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 · + + 2 · 98 + 200 = 1,595 mm (Order length NL = 1,600 mm)
h1 = 350 + + 98 + = 648 mm
h2 = 350 + 98 + = 548 mm