Comparative Study on Design of Exposed Penstock Laid on Ground Using Chinese and American Specifications

Abstract:

In this paper, differences by using selected three typical specifications—DL/T 5141-2001 (Chinese), ASCE No.79 in the version of 1993(American) and ASCE No.79 in the version of 2012 (American)—in structural design of exposed steel penstock were explored. A practical example about exposed penstock laid on ground applied in hydropower station was also used to analyze specifications clearly. The result shows that the main differences between Chinese and American specifications are allowable stress and load combination. The former is direct factor of calculating exposed penstock shell thickness. Therefore, ASCE No.79 (2012) designs the minimum wall thickness, followed by DL/T 5141-2001 and the last is ASCE No.79 (1993), which is correspondingly contrary to sort by allowable stress. Basically, ASCE No.79 (2012) defines lower safety coefficient for exposed penstock, which is identical with authoritative rules of pressure vessels in the U.S.A and EU. The safety of DL/T 5141-2001 has been proved via rich engineering experience and this specification is recommended for Chinese projects. Besides, ASCE No.79 (2012) is recommended.

• Periodical: Applied Mechanics and Materials (Volumes 580-583)
• Pages: 2000-2006
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.580-583.2000
• Online since: July 2014
• Authors: Lei Hu, He Gao Wu*, Chang Zheng Shi, Ying Han Xie
• Keywords: Allowable Stress, ASCE No.79, Dl/T 5141-2001, Exposed Penstock Laid on Ground, Hydropower Station, Load Combination

References

[6] 1. 5 3. 0 U.S. A Pressure vessel ASME BPVC- VIII -2-(2007).

[7] 1. 5 2. 4 EU Pressure vessel EN 13445-(2002).

[8] 1. 5 2. 4 Note: Values for DL/T 5141-2001 are suitable for steel penstock of class I in lasting condition and values 0. 3. Conclusions From comparison of designing exposed penstock using DL/T 5141-2001(Chinese) and ASCE No. 79(American), it comes to several conclusions as follows. (1) Differences of rules: DL/T 5141-2001 adopts limit-state design method based on theory of probability, the design equation is characterized by partial factors. ASCE No. 79 adopts allowable stress method. The basic principle of stress classification is introduced into both of them. Calculation of allowable stress is main difference. ASCE No. 79 (2012).

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DOI: 10.1115/1.859872.ch23

[7] ASME BPVC-VIII-2-2007 ASME Boiler & Pressure Vessel Code, Section 8 Division 2, Alternative Rules, Rules for Construction of Pressure Vessels, [S]. American Society of Mechanical Engineers, (2007).

DOI: 10.1115/1.859872.ch23

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