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# Re: High Tire Pressure on Concrete slab

• To: seaint(--nospam--at)seaint.org
• Subject: Re: High Tire Pressure on Concrete slab
• From: richard lewis <rlewistx(--nospam--at)juno.com>
• Date: Tue, 16 Nov 2004 17:42:30 -0600

I don't believe the tires are inflated.  I agree, 900 psi tire pressure is high, that's my problem.  I am using a Jungheinrich ETXac 125 fork truck.  The brochure states the tires are "Tractotan".  The published contact pressure is 620 N/cm^2.  My conversion program puts that at 899 psi.

Rich

On Tue, 16 Nov 2004 09:52:53 -0800 (PST) Padmanabhan Rajendran <rakamaka(--nospam--at)yahoo.com> writes:
Richard,

I suspect that your data is in error.  Find out, from the fork lift manufacturer, the pressure to which the tires must be inflated. Then the contact area will be the load on the wheel divided by the tire inflation pressure. In other words, the contact pressure is, theoretically, equal to the tire inflation pressure.

For your information, even some of the large Caterpillar earthmoving equipment have contact pressures less than 50 psi.

Rajendran

richard lewis <rlewistx(--nospam--at)juno.com> wrote:
I'm working on the design of a slab for a fork truck that has tire
contact pressure up to 900 psi. This makes for a very small contact
area. The design problem I have for the slab is that the parameters are
"off the chart" for the PCA design method and the WRI design method. The
only one that is "on the chart" is the Core of Engineers method because
it is not based on contact pressure, but axle load and frequency of
traffic.

Are there design standards for the newer fork trucks that high the high
wheel contact pressure and high speed travel? I have used the text
"Designing Floor Slabs on Grade, 2 ed." by Ringo to check these 3
standards mentioned above. The fork truck manufacturer will not give me
any direction for slab design.

Rich

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