Page 280 - untitled

Parker Hannifin Corporation
Parflex Division
Ravenna, Ohio
274
Hydraulic &PneumaticHose & Fit.
PTFEHose &Fittings
Thermoplastic
Tubing
Coiled Air Hose,
Fittings
& Accessories
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Hose
Accessories
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Index
Calculation of Hose Length for Over-the-Sheave Applications
Parflex Hose —
Calculation of Hose Length for Over-the-Sheave Applications
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.