Hose
A
Tubing
B
Coiled Air Hose
&
Fittings
C
Transportation
D
Fittings
E
Tooling, Equipment
&
Accessories
F
Parker Hannifin Corporation
| Parflex
®
Division | Ravenna, Ohio |
parker.com/pfd
For detailed ordering information, please consult price list or contact Parflex
®
Division.
General Technical
G
G-5
Calculation of Hose Length
The exact cutoff length for an optimum over-the-sheave assembly depends on the particular
mechanical arrangement of the machine. A method for finding an approximate starting point is as
follows:
1.
Assemble hose with one coupling as shown in diagram.
2.
Measure hose length from point 1 to point 2 with hose taut (.985 accounts for 1.56 stretch).
LO = length
3.
Calculation of insert allowance (x) may be found from the coupling dimension tabulations in
the fittings section or from direct measurement on the coupling. A 1.5% stretch allowance is
provided in this formula.
4.
Calculate hose cutoff or free length LF:
LF = 0.985 LO + 2x
Where LF includes coupling, insert allowance on both ends.
5.
Couple the remaining hose end, check crimp, and assemble on the machine.
For Over-the-Sheave Applications