## Slip Crushing Of Tubulars

Reinhold, Spiri, and Vreeland published the following equation and table which relates the tube crushing tangential stress derived from slips and axial tensile loads. The steel in the pipe will be crushed when and if S^ is equal to the unit yield strength, YP, of the steel.

S^ = tangential stress in the pipe derived from the crushing action of slips and the effective tension in the pipe; psi

St = axial effective tensile stress in the pipe at the slips;

psi Teff

D = outside diameter of the pipe; inch

L = length of the slips (usually either 12" or 16"); inch

K = lateral load factor of slips

= 4.0 for a coefficient of friction of 0.08 y = taper of slip, usually 9° 27' 45"

z = friction angle = tan"1u u = coefficient of friction between slips and bushing.

= reasonable value for lubricated slips = 0.08

A = cross-sectional area of the wall of the drillpipe;

inch^

+1 0

## Homeowners Guide To Landscaping

How would you like to save a ton of money and increase the value of your home by as much as thirty percent! If your homes landscape is designed properly it will be a source of enjoyment for your entire family, it will enhance your community and add to the resale value of your property. Landscape design involves much more than placing trees, shrubs and other plants on the property. It is an art which deals with conscious arrangement or organization of outdoor space for human satisfaction and enjoyment.

Get My Free Ebook

### Responses

• ulrich
What is slip crushing?
4 years ago