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Title: Cast-stone sectors for lining bends in pipework

Abstract

The authors disclose an efficient method for lining the bends of pipelines used to deliver coal dust to the burners of coal-fired power plants or to transport coal slurries in mining and preparation enterprises. The method consists of melting a wear-resistant silicate compound and casting it in the form of rings whose increased width on the outboard side accounts for the angle of the bend when the rings are installed consecutively inside the pipe. Enhanced service life estimations and cost benefit analyses are given for pipe bends thus lined in both of the above applications.

Authors:
; ; ; ;
Publication Date:
Research Org.:
S.M. Kirov Urals Polytechnic Institute, USSR
OSTI Identifier:
6560532
Resource Type:
Journal Article
Resource Relation:
Journal Name: Glass Ceram. (Engl. Transl.); (United States); Journal Volume: 43:7/8; Other Information: Translated from Steklo Keram.; 43: No. 7, 5-6(Jul 1986)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 01 COAL, LIGNITE, AND PEAT; 20 FOSSIL-FUELED POWER PLANTS; COAL FINES; TRANSPORT; FUEL SLURRIES; LINERS; CASTING; WEAR RESISTANCE; PIPELINES; SERVICE LIFE; SILICATES; CASTING MOLDS; CASTINGS; COST BENEFIT ANALYSIS; FOSSIL-FUEL POWER PLANTS; FUEL FEEDING SYSTEMS; INSTALLATION; PIPE JOINTS; PROTECTIVE COATINGS; RINGS; COATINGS; DISPERSIONS; FABRICATION; FUEL SYSTEMS; FUELS; JOINTS; MECHANICAL PROPERTIES; MIXTURES; OXYGEN COMPOUNDS; POWER PLANTS; SILICON COMPOUNDS; SLURRIES; SUSPENSIONS; THERMAL POWER PLANTS 360601* -- Other Materials-- Preparation & Manufacture; 013000 -- Coal, Lignite, & Peat-- Transport, Handling, & Storage; 200108 -- Fossil-Fueled Power Plants-- Fuels-- (1980-)

Citation Formats

Chechulin, V.A., Novikov, A.I., Karpov, V.M., Sotnik, A.A., and Sedyshev, B.L.. Cast-stone sectors for lining bends in pipework. United States: N. p., 1987. Web.
Chechulin, V.A., Novikov, A.I., Karpov, V.M., Sotnik, A.A., & Sedyshev, B.L.. Cast-stone sectors for lining bends in pipework. United States.
Chechulin, V.A., Novikov, A.I., Karpov, V.M., Sotnik, A.A., and Sedyshev, B.L.. 1987. "Cast-stone sectors for lining bends in pipework". United States. doi:.
@article{osti_6560532,
title = {Cast-stone sectors for lining bends in pipework},
author = {Chechulin, V.A. and Novikov, A.I. and Karpov, V.M. and Sotnik, A.A. and Sedyshev, B.L.},
abstractNote = {The authors disclose an efficient method for lining the bends of pipelines used to deliver coal dust to the burners of coal-fired power plants or to transport coal slurries in mining and preparation enterprises. The method consists of melting a wear-resistant silicate compound and casting it in the form of rings whose increased width on the outboard side accounts for the angle of the bend when the rings are installed consecutively inside the pipe. Enhanced service life estimations and cost benefit analyses are given for pipe bends thus lined in both of the above applications.},
doi = {},
journal = {Glass Ceram. (Engl. Transl.); (United States)},
number = ,
volume = 43:7/8,
place = {United States},
year = 1987,
month = 3
}
  • Cast stone is a cementitious waste form, a viable option to immobilize secondary nuclear liquid wastes generated from Hanford vitrification plant. While the strength and radioactive technetium leaching of different waste form candidates have been reported, no study has been performed to understand the flow and stiffening behavior of Cast Stone, which is essential to ensure the proper workability, especially considering necessary safety as a nuclear waste form in a field scale application. The rheological and ultrasonic wave reflection (UWR) measurements were used to understand the setting and stiffening Cast Stone batches. X-ray diffraction (XRD) was used to find themore » correlation between specific phase formation and the stiffening of the paste. Our results showed good correlation between rheological properties of the fresh Cast Stone mixture and phase formation during hydration of Cast Stone. Secondary gypsum formation originating from blast furnace slag was observed in Cast Stone made with low concentration simulants. The formation of gypsum was suppressed in high concentration simulants. It was found that the stiffening of Cast Stone was strongly dependent on the concentration of simulant. A threshold concentration for the drastic change in stiffening was found at 1.56 M Na concentration.« less
  • Low activity radioactive waste at U.S. Department of Energy sites can be immobilized for permanent disposal using cementitious waste forms. This study evaluated waste forms produced with simulated wastes at concentrations up to twice that of currently operating processes. The simulated materials were evaluated for their fresh properties, which determine processability, and cured properties, which determine waste form performance. The results show potential for greatly reducing the volume of material. Fresh properties were sufficient to allow for processing via current practices. Cured properties such as compressive strength meet disposal requirements. Leachability indices provide an indication of expected long-term performance.
  • Cast Stone is a cementitious waste form, a viable option to immobilize secondary nuclear liquid wastes generated from the Hanford Waste Treatment and Immobilization Plant. However, no study has been performed to understand the flow and stiffening behavior, which is essential to ensure proper workability and is important to safety in a nuclear waste field-scale application. X-ray diffraction, rheology, and ultrasonic wave reflection methods were used to understand the specific phase formation and stiffening of Cast Stone. Our results showed a good correlation between rheological properties of the fresh mixture and phase formation in Cast Stone. Secondary gypsum formation wasmore » observed with low concentration simulants, and the formation of gypsum was suppressed in high concentration simulants. A threshold concentration for the drastic change in stiffening was found at 1.56 M Na concentration. It was found that the stiffening of Cast Stone was strongly dependent on the concentration of simulant. Highlights: • A combination of XRD, UWR, and rheology gives a better understanding of Cast Stone. • Stiffening of Cast Stone was strongly dependent on the concentration of simulant. • A drastic change in stiffening of Cast Stone was found at 1.56 M Na concentration.« less