Initial Specific Ring Stiffness, Resistance to Deflection and Creep
YLE stiffness (STIS) testers are leaders in the fiberglass (FRP, GRP and GRE) pipe industry.
Test standards compliance
YLE stiffness testing equipment complies with the following test standards:
Initial specific ring stiffness, STIS
DIN EN 1228
ASTM D 2412
Resistance to deflection
DIN EN 1226
ASTM D 2412
Resistance to creep
Stiffness testing equipment
Depending of maximum pipe size a number of alternatives exist of measuring initial specific ring stiffness, resistance to deflection and creep of fiberglass pipes:
CK stiffness testing machines: DN ≤ 4000
YLE's CK are the leading stiffness testers in the fiberglass pipe industry for testing pipes of DN 50 to DN 4000. Two standard models exist:
- CK3200: For testing pipes of OD up to 3200 mm (125 inches)
- CK4400 For testing pipes of OD up to 4400 mm (172 inches)
SLRS - Specimen lifting and rotation system
Manipulation of stiffness specimens of 3000 mm diameter and greater requires more than one operator for handling specimen during loading and testing and poses a serious risk hazard. For example, a 4 meter pipe stiffness ring has a weight exceeding 400 Kg, a slenderness ratio greater than 13, and a center of gravity 2 meters high. The handling of such specimens poses serious safety risks. To address this hazard, YLE developed the Specimen Lifting and Rotation System (SLRS) which is incorporated as standard in CK4400 machines and is offered as an option on CK3200 machines. In addition to addressing safety concerns, the SLRS provides improved user-friendliness and productivity.
A CK4400 with SLRS won the Innovation Award of the 2014 Shanghai Composites Expo.
LCS stiffness testing machines: DN ≤ 2000
For factories with pipe production up to DN 2000, YLE's offers the LCS stiffness tester with maximum opening of 2200mm
YL25 universal testing machines: DN ≤ 600
For factories with pipe production up to DN 600, stiffness tests may be undertaken on the YL25 UTM.