Papers by Keyword: In Place

Abstract: An approach is described for the in situ measurement of CO₂ flux at various depths in arid soil. In this method, a sampling tube is inserted to the desired soil depth in a pre-drilled hole, and an infrared CO₂ gas analyzer connected to the sampling tube is used to quantify CO₂ (based on absorption of CO₂ by infrared rays). In a preliminary test, the method was used to quantify CO₂ concentration and flux in an arid grassland soil. The results indicated that it could be used to quantify CO₂ flux in soil from 0–200 cm depths , and should be useful for estimating CO₂ flux and storage at different soil depths, for estimating the change in CO₂ emission from soil caused by change in land-use/land-cover, for assessing the rate of restoration of soil fertility and other soil properties in arid soils, and for monitoring leakage from geological storage of CO₂.

Abstract: This paper addresses the structural response and characteristics of a Tarpon platform, presented as an in depth sensitivity study of its structural system from the perspective of its reserve strength ratio and mode of failure. The Tarpon platform is one of many marginal field minimal platform concepts in use worldwide. PETRONAS currently owns and operates several Tarpons in Malaysian waters. A single platform of which its data is most complete and available is chosen to represent the fleet of Tarpon Monopods in Malaysian waters. The platform, heretofore named Platform A, situated offshore Terengganu, is modeled and simulated in SACS v5.3 to reflect it’s as built condition. The SACS Collapse module was utilized to simulate the Tarpon’s ultimate strength which serves as a benchmark for the comparison of the static in place analysis to obtain the Reserve Strength Ratio (RSR). The initiating mode of failure was determined to be at the anchor piles. The results point out that the Tarpon Monopod has a low structural redundancy, especially where there is a loss of wire rope.

Abstract: A pre-action fire suppression system was installed in a portion of a US Army Reserve Component Headquarters building in the Southeastern United States, when the structure was constructed in 1995. A pre-action fire suppression system, which is normally kept at a standard internal air pressure using air compressors in the basement electrical-mechanical room, is designed to remain dry and only have water in it in the event of a fire. The installed pre-action system developed pinhole leaks due to what appeared to be galvanic corrosion. An in-situ epoxy lining technique was used to stop the corrosion and restore the integrity of the fire suppression system piping. The work included lining of all interior pre-action piping mains, risers, branch laterals and service piping to individual sprinkler head locations, installing new ½” sprinkler heads on the preaction system followed by recertification of the pre-action system. This presentation describes the in-place epoxy lining process and presents before and after photographs of the coated system used to eliminate the pin hole leak problem.