Fitness-for-Service Assessment of an Injection Point in a Boiler Feed-Water Line Subjected to Corrosion

2018 ◽  
Author(s):  
Takuyo Kaida ◽  
Masahiro Sasaki ◽  
Luis Alejandro Baldomir Gutierrez
Keyword(s):  
Practical Method ◽  
Localized Corrosion ◽  
Metal Loss ◽  
Feed Water ◽  
Piping System ◽  
Injection Point ◽  
Internal Corrosion ◽  
Water Line ◽  
Plant Shutdown ◽  
Boiler Feed Water

When inspecting a piping system, injection points should receive specific attention because they are sometimes subject to accelerated or localized corrosion. If metal loss is found at the location of such injection points during the inspection, a Fitness-For-Service (FFS) assessment can be used to evaluate whether the component can continue to operate safely without a plant shutdown. A more practical method for assessing the integrity is needed to provide specific procedures for the FFS assessment of a piping branch, e.g., an area-replacement rule. This paper will present a practical example of an FFS assessment of an injection point in a boiler feed-water line in which internal corrosion was found using ultrasonic testing. We outline a way to characterize the metal-loss shape and assess the integrity of the injection point. We also present a quill-type injection design as a permanent countermeasure.

Analysis of a Feed Water Distribution Ring for a Water Hammer Load Following a Pipe Break

2013 ◽  
Author(s):  
Anders Olsson ◽  
Mikael Möller
Keyword(s):  
Water Distribution ◽  
Pressure Pulse ◽  
Check Valve ◽  
Feed Water ◽  
Piping System ◽  
Pressurized Water Reactor ◽  
Pressurized Water ◽  
Water Line ◽  
Load Following ◽  
Pipe Break

In a nuclear pressurized water reactor (PWR) the steam is created in steam generators (SG). The water is returned to the SG via the feed water line and is mixed with the warmer water inside the SG by means of a feed water distribution ring. In the feed water line just outside the SG there is a check valve that will close at pipe break upstream the valve. When the valve closes the water flow through the valve halts and a severe pressure pulse will move into the feed water distribution ring. The pressure pulse is much higher than what the feed water distribution ring can resist statically. However, taking FSI and plasticity into account the magnitude of the pressure pulse is reduced significantly. In this paper an analysis of a feed water distribution ring taking FSI into account with acoustic elements is presented. Without FSI the calculated pressure was 3.7 times higher than the allowable static pressure but taking FSI into account it could be shown that the piping system could be qualified for the event. One of the key issues is the valve model that is elaborated in order to model the closing of the valve as accurately as possible.

Gas chromatographic determination of residual hydrazine and morpholine in boiler feed water and steam condensates

1994 ◽  
Vol 38 (7-8) ◽  
pp. 456-460 ◽  
Author(s):  
S. Vatsala ◽  
V. Bansal ◽  
D. K. Tuli ◽  
M. M. Rai ◽  
S. K. Jain ◽  
...  
Keyword(s):  
Chromatographic Determination ◽  
Feed Water ◽  
Boiler Feed Water

Stress Corrosion Cracking of SA-543 High-Strength Steel in All-Volatile Treatment Boiler Feed Water

2015 ◽  
Vol 24 (10) ◽  
pp. 3773-3782
Author(s):  
R. Rihan ◽  
M. Basha ◽  
A. Al-Meshari ◽  
A. Bayramov ◽  
G. van Zyl ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Strength Steel ◽  
High Strength ◽  
Corrosion Cracking ◽  
Feed Water ◽  
Boiler Feed Water

scholarly journals Ethylene Yield from Pyrolysis Cracking in Olefin Plant Utilizing Regression Analysis

2021 ◽  
Vol 287 ◽  
pp. 03004
Author(s):  
Mohamad Hafizi Zakria ◽  
Mohd Ghazali Mohd Nawawi ◽  
Mohd Rizal Abdul Rahman
Keyword(s):  
Regression Analysis ◽  
Water Flow ◽  
Large Scale ◽  
Nox Emission ◽  
Feed Water ◽  
Yield Model ◽  
Liquid Feed ◽  
The Impact ◽  
Steam Drum ◽  
Boiler Feed Water

Ethylene yield is significant in showing the performance of the steam cracker furnace in the olefin plant. This study was conducted in the actual large-scale olefin plant to see the impact of various variables towards the ethylene yield. The analysis was conducted utilizing Regression Analysis in Minitab Software Version 18 to develop a reliable ethylene yield model. The model concluded that ethylene yield in the studied plant was contributed by the factor of -0.000901, 0.02649, -0.282, 0.16, -0.0834, 0.1268, and 0.0057 of Hearth Burner Flow, Integral Burner Flow, Steam Drum Pressure, Super High-Pressure Steam (SHP) Boiler Feed Water Flow, SHP Flow, Naphtha Feed Flow, and Stack NOx Emission respectively. The Response Optimizer tool also showed that the ethylene yield from naphtha liquid feed utilizing pyrolysis cracking can be maximized at 32.55% with control setting at 9,476.41 kg/hr of Hearth Burner Flow, 608.56 kg/hr of Integral Burner Flow, 112.93 Barg of Steam Drum Pressure, 109.11 t/hr of SHP Boiler Feed Water Flow, 86.42 t/hr of SHP Flow, 63.49 t/hr of Naphtha Feed Flow and 126.23 mg/m3 of Stack NOx Emission.

scholarly journals Treatment Method Assessment of the Impact on the Corrosivity and Aggressiveness for the Boiler Feed Water

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1965 ◽  
Author(s):  
Skoczko ◽  
Szatyłowicz
Keyword(s):  
Water Quality ◽  
Water Treatment ◽  
Saturation Index ◽  
Treatment Plant ◽  
High Water ◽  
Feed Water ◽  
Exchange Cation ◽  
Boiler Water ◽  
The Impact ◽  
Boiler Feed Water

The aim of the study was the assessment of corrosivity and aggressiveness for boiler feed water. The negative effects of water corrosivity and aggressiveness may include silting up of the steel water supply system and the destruction of boiler equipment touched or washed by such water. They may cause the whole industrial production system to fail or be destroyed. That is why it was important to reach a high water purification level, including the calculation of water aggressiveness and corrosivity indicators. The carried out test showed that the simple system used before the modernization of the industrial water treatment plant is not sufficient to reach clean and stable water. The authors proposed modernization, including additional processes to improve boiler water quality, and designed new devices for water treatment. As a result of the new idea, groundwater taken as raw water was treated in individual and complex processes, such as pre-aeration, filtration, ion exchange (cation and anion exchange resigns), extra aeration, and extra degassing. The conducted research included chemical analyses of raw and treated water. In the conducted studies, the indirect method of water aggressiveness and corrosivity assessment was applied using mathematical calculation of the Langelier Saturation Index (LSI), the Ryznar Stability Index (RI), the Larson–Skold Index (LI), and the Singley Index (SI). The results proved that the new proposed processes for the boiler feed water treatment station allow reaching a high water quality and low level of water aggressiveness and corrosion.

Effectiveness of Ultraviolet Light For Mitigating Risk of Microbiologically Influenced Corrosion in Steel Pipeline

2015 ◽  
Vol 74 (4) ◽  
Author(s):  
M. K. F. M. Ali ◽  
N. Md. Noor ◽  
N. Yahaya ◽  
A. A. Bakar ◽  
M. Ismail
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Microbiologically Influenced Corrosion ◽  
Metal Loss ◽  
Desulfovibrio Vulgaris ◽  
Pipeline System ◽  
Long Distance ◽  
Gas Industry ◽  
Internal Corrosion ◽  
Steel Pipeline

Pipelines play an extremely important role in the transportation of gases and liquids over long distance throughout the world. Internal corrosion due to microbiologically influenced corrosion (MIC) is one of the major integrity problems in oil and gas industry and is responsible for most of the internal corrosion in transportation pipelines. The presence of microorganisms such as sulfate reducing bacteria (SRB) in pipeline system has raised deep concern within the oil and gas industry. Biocide treatment and cathodic protection are commonly used to control MIC. However, the solution is too expensive and may create environmental problems by being too corrosive. Recently, Ultraviolet (UV) as one of the benign techniques to enhance mitigation of MIC risk in pipeline system has gained interest among researchers. An amount of 100 ml of modified Baar’s medium and 5 ml of Desulfovibrio vulgaris (strain 7577) seeds was grown in 125 ml anaerobic vials with carbon steel grade API 5L-X70 coupons at the optimum temperature of 37°C and pH 9.5 for fifteen days. This was then followed by exposing the medium to UV for one hour. Results from present study showed that UV radiation has the ability to disinfect bacteria, hence minimizing the risk of metal loss due to corrosion in steel pipeline. 

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