RST-2 pipe ring stiffness testing machine ISO 9969 is used to determine the ring stiffness of circular cross-section thermoplastic pipes, according customer’s request, it can also execute compression, ring stiffness, ring softness and creep ratio test. This tester meet the requirement of all kinds of plastic pipes, structured-wall pipes, PVC, HDPE, LDPE, PE corrugated pipes, helically wound pipes etc.,
Conform with Standard ISO 9969, ISO 9967.

Feature of RST-2 series:
Suitable for small or middle size pipe test (1000mm dia.);  computer control, High level quality.
 
Principle of ring stiffness: 
The ring stiffness is determined by measuring the force and the deflection while deflecting the pipe at a constant deflection speed.
A cut length of pipe supported horizontally is compressed vertically between two parallel flat platens moved at a constant speed that is dependent upon the diameter of the pipe.
A plot of force versus deflection is generated. The ring stiffness is calculated as a function of the force necessary to produce a 3% diametric deflection of pipe.

Principle of creep ratio: 
A cut length of pipe is placed between two parallel flat horizontal plates and a constant compressive force is applied for 1008 h (42 days). The deflection of the pipe is recorded at specified intervals so as to prepare a plot of pipe deflection against time. The linearity of the data is analysed and the creep ratio is calculated as the ratio between the two years’ extrapolated deflection value and the measured 6 min (0.1 h) deflection.

Model: RST-2 series Suitable for small or middle size pipe test (less than 1000mm dia.)

Max. load 10KN, 20Kn, 30Kn, 50Kn, 100Kn

Load resolution 0.01N

Load cell quantity 1 to 3 pcs

Load accuracy ±1% of reading value

Crosshead travel 100mm-3500mm

Pipe Diameter range 16mm to 3200mm

Speed range of crossbeam 0.1 mm/min～500 mm/min, stepless, adjustable freely

Width of test space 420mm to 1000mm

Displacement accuracy 0.001mm

Power 220V/380V, 50Hz/60HZ

Pipe inner diameter measuring device: YES

Creep Ratio Test(option): ISO 9967

Time range: 1～9999h59min59s

Timing resolution: 1s

Other name:
Pipe ring stiffness tester, PVC pipe ring stiffness test, HDPE pipe ring stiffness testing equipment, PE pipe creep rate test, thermoplastic pipe creep ratio test. RST-2 pipe ring stiffness testing machine ISO 9969

^{ISO 9969  "Thermoplastics pipes -- Determination of ring stiffness”
ISO9967  "Thermoplastics pipes -- Determination of creep ratio“}