Installation damage

In the context of geotextile reinforcements, it is common to measure the installation damage that will be experienced during application. In general, test procedures to measure resistance to installation damage differ slightly in their approach, but some common features enable testing and research laboratories to accommodate the requirements established by all. 

The most commonly employed procedure was first developed by Watts and Brady (1994) of the Transport Research Laboratory in the United Kingdom. This procedure 

2 Laboratory small-scale Installation damage testing 

Although the laboratory-scale installation damage test does not develop retained strength values useable for reinforcement design, it has proved useful to index 

3 Long-term dynamic loading (fatigue) of geotextiies 

---

It is important to note that each bag in a set may have a different life as a result of fabric quality, bag manufacturing tolerances, location in the collector, and variation in the bag cleaning mechanism. Any one or a combination of these factors can cause bags to fail. This means that a baghouse will experience a series of intermittent bag failures until the failure rate requires total bag replacement. Typically, a few bags will fail initially or after a short period of operation due to installation damage or manufacturing defects. The failure rate should then remain very low until the... 

The robust nature of earthwork constructions is likely to make material damage a more significant factor for soil reinforcement than for other applications of polymer materials, and therefore consideration should also be given to possible strength loss caused by installation damage. 

A9. Risk reduction targets may be specified as estimated probabilities for defined detrimental effects, such as installation damage, radioactive release or health effects on the public. For example, in INSAG-3 the following targets are given ... 

It is important to make a complete mechanical check of motor control eqnipment before and after installation. Damaged or broken parts can usually be found easily and qnickly, and replaced if necessary. Visual checks should be made with the aid of a flashlight, air hose, and a small bmsh. Debris and dirt can be brushed from contacts and other areas of the switch Ught rnst and dirt on pole faces can be removed with conqtressed air and brush. Never use a file or abrasive of any kind on pole faces since this can upset the precise fit between core components. A simple tightening of terminal screws should be sufficient to correct many motor controller problems. 

Excellent resistance to installation damage high puncture resistance ... 

So far the tank coating is intact since the tanks are coated after installation. Assume a 2% (Ac = 0.02) deterioration of the coating per year so that the total damage in 20 years is 40%. From eq. (8.62), the final current along with zero installation damage (Aj = 0) is... 

Failure mode VI Small leakage. Its causes are installation damage and insufficient squeeze. 

Resistance against installation damage ISO 10722 ISO/TS 19708 Chapter Long-term geotextile degradation mechanisms and exposed lifetime predictions... 

Robustness Resistance to installation damage ASTM D5818 ISO 10722-1 X X X X X X... 

Figure 9.17 Example of the installation damage exposure procedure.

Watts, G.R.A., Brady, K.C., 1994. Geosynthetics—installation damage and the measurement of tensile strength. In Proceedings of the 5th International Conference on Geotextiles, Geomembranes and Related Products. 

---