Integrity of Roller Expanded Tube-to-Tubesheet Joints With Over-Enlarged Tubesheet Holes

2006 ◽  
Author(s):  
A. N. Shuaib ◽  
N. Merah ◽  
M. Ahmed ◽  
Y. N. Al-Nassar ◽  
S. S. Al-Anizi
Keyword(s):  
Experimental Investigation ◽  
Heat Exchanger ◽  
Joint Strength ◽  
Metal Contact ◽  
Test Results ◽  
Pull Out ◽  
Increasing Trend ◽  
Initial Clearance ◽  
Joint Integrity ◽  
Design Pressure

This paper presents the results of an experimental investigation conducted to evaluate the effect of initial tube-tubesheet diametral clearance on the integrity of roller expanded tube-to-tubesheet joints in over enlarged tubesheet holes. The criteria of evaluating joint integrity include the pull out force and hydraulic tightness of the joints in which tubes were expanded to 5% wall reduction after metal to metal contact of the tube with the tubesheet hole. The levels of clearance investigated were selected to cover a range that exceeded by ten times that prescribed by the Tubular Exchangers Manufacturers Association (TEMA) standards [1]. The pull out test results showed that, within the investigated range of clearance, the joint strength has not declined below the strength of joints with clearance levels within the TEMA range. In fact the pull out force exhibited a slight linear increasing trend with the increase in initial clearance, which is attributed to the effect of tube strain hardening. The hydro test results indicated that all joints within the investigated clearance levels were hydraulically tight when they were tested at 1.5 times the design pressure of the heat exchanger for duration of 30 minutes. A relationship between rolling specific energy and initial joint clearance has been developed.

Integrity of Roller-Expanded Tube-to-Tubesheet Joints With Overenlarged Tubesheet Holes

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
A. N. Shuaib ◽  
N. Merah ◽  
M. Ahmed ◽  
Y. N. Al-Nassar ◽  
S. S. Al-Anizi
Keyword(s):  
Experimental Investigation ◽  
Joint Strength ◽  
Pullout Test ◽  
Metal Contact ◽  
Test Results ◽  
Pullout Force ◽  
Increasing Trend ◽  
Initial Clearance ◽  
Joint Integrity ◽  
Design Pressure

This paper presents the results of an experimental investigation conducted to evaluate the effect of initial tube-tubesheet diametral clearance on the integrity of roller-expanded tube-to-tubesheet joints in overenlarged tubesheet holes. The criteria of evaluating joint integrity include the pullout force and hydraulic tightness of the joints in which tubes were expanded to 5% wall reduction after metal to metal contact of the tube with the tubesheet hole. The levels of clearance investigated were selected to cover a range that exceeded by ten times that prescribed by the Tubular Exchangers Manufacturers Association (TEMA) standards (Standards for the Tubular Exchanger Manufacturers Association, 1988, 7th ed., TEMA, Tarrytown, NY). The pullout test results showed that, within the investigated range of clearance, the joint strength has not declined below the strength of joints with clearance levels within the TEMA range. In fact, the pullout force exhibited a slight linear increasing trend with the increase in initial clearance, which is attributed to the effect of tube strain hardening. The hydrotest results indicated that all joints within the investigated clearance levels were hydraulically tight when they were tested at 1.5 times the design pressure of the heat exchanger for a duration of 30min. A relationship between rolling specific energy and initial joint clearance has been developed.

scholarly journals EXPERIMENTAL INVESTIGATION OF PULL OUT STRENGTH OF FLEXIBLE TIES IN THIN BRICK VENEER LAYER

2020 ◽  
Vol 11 (4) ◽  
pp. 114-118
Author(s):  
Robertas Zavalis ◽  
Bronius Jonaitis
Keyword(s):  
Experimental Investigation ◽  
Experimental Research ◽  
Experimental Test ◽  
Brick Masonry ◽  
Test Results ◽  
Pull Out ◽  
Building Facades ◽  
Brick Veneer ◽  
Flexible Metal ◽  
Pull Out Strength

The use of thin brick veneer layers for building facades becomes more popular nowadays. Using thin bricks (50−65 mm thick) instead of normal 100−120 mm thick bricks let us to save expenses up to 50% related to materials. The connection of thin veneer layer with inner construction wall must be assured. Usually, the connection is fulfilled using flexible metal or composite ties. The main issue for this connection is tie pull out strength from thin brick masonry. This strength depends on type and construction of ties and it governs the number of ties need for facades. This article describes experimental research of pull out strength of flexible steel ties in thin brick masonry. Two possible anchoring types were used. Experimental test results and analysis are described in the article.

Experimental Investigation on Rubber-Expanded Tube-to-Tubesheet Joints of Zr Heat Exchangers

2008 ◽  
Author(s):  
Biao Yuan ◽  
Ying Zhi Wang ◽  
Xin Ma ◽  
Shan-Tung Tu ◽  
Yan-An Xi ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Heat Exchangers ◽  
Joint Strength ◽  
Operating Temperature ◽  
Experimental Results ◽  
Experimental Conditions ◽  
Working Temperature ◽  
Pull Out ◽  
Sealing Performance ◽  
Pull Out Strength

Mechanics of flexible expansion was expounded, and technology points of uniform rubber expanding in tube-to-tubesheet joints of Zirconium (Zr) heat exchangers were introduced. A series of pull-out strength and tightness experiments were performed for rubber-expanded tube-to-tubesheet joints. The experimental results show that the pull-out strength decreases linearly with increasing of operating temperature in the range of 20∼300°C, the pull-out strength of joints composed of Zr tubes attached to 16MnR and 316L tubesheets (abbreviated as Zr/16MnR and Zr/316L joints and heat exchangers include these joints are called Zr heat exchangers) drops much faster than that of joints composed of Titanium (Ti) tubes attached to 16MnR tubesheets (abbreviated as Ti/16MnR joints), and the joint strength can meet the requirements specified in Chinese code & standard at the experimental conditions. It is also found that the tightness of rubber expanded tube-to-tubesheet joints drops obviously with the increase of working temperature from 20 to 200°C, and the sealing performance of the joints enhances markedly when rubber-expanded tube-to-tubesheet joints are subsequently expanded with roller. Moreover, the influences of Enlargement Rate of Tubesheet Hole (ERTH) on the strength of rubber-expanded tube-to-tubesheet joints is discussed, it is observed that the pull-out strength of the connection joints with non-grooved tubesheet holes increases linearly with increasing of ERTH when the expanding pressure is not larger than 38 MPa, whereas this is not the case for the joint with grooved tubesheet holes.

EXPERIMENTAL INVESTIGATION OF HEAT PIPE HEAT EXCHANGER (HPHE) FOR WASTE HEAT RECOVERY APPLICATION

2019 ◽  
Author(s):  
Sakil Hossen ◽  
AKM M. Morshed ◽  
Amitav Tikadar ◽  
Azzam S. Salman ◽  
Titan C. Paul
Keyword(s):  
Experimental Investigation ◽  
Heat Exchanger ◽  
Heat Pipe ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Pipe Heat

scholarly journals Experimental investigation of a plate heat exchanger model for lithium bromide absorption chillers: first results

2019 ◽  
Vol 196 ◽  
pp. 00033
Author(s):  
Konstantin Stepanov ◽  
Dmitry Mukhin ◽  
Olga Volkova
Keyword(s):  
Experimental Investigation ◽  
Heat Exchanger ◽  
Lithium Bromide ◽  
Plate Heat Exchanger ◽  
Plate Heat ◽  
Absorption Chillers ◽  
First Results

In this paper the results of thermal-hydraulic tests of a sample of a perspective plate heat exchanger under the conditions of LBAHT is described. Working opportunity of the sample working under conditions of LBAHT has been confirmed by this research.

scholarly journals Experimental Investigation on Composite Deck Slab Made of Cold-Formed Profiled Steel Sheeting

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 229
Author(s):  
Siva Avudaiappan ◽  
Erick I. Saavedra Flores ◽  
Gerardo Araya-Letelier ◽  
Walter Jonathan Thomas ◽  
Sudharshan N. Raman ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Test Results ◽  
Shear Connectors ◽  
Modes Of Failure ◽  
Deck Slabs ◽  
Load Carrying ◽  
Composite Slabs ◽  
Ultimate Load Carrying Capacity ◽  
Ductility Ratio ◽  
Deck Slab

An experimental investigation is performed on various cold-formed profiled sheets to study the connection behavior of composite deck slab actions using bolted shear connectors. Various profiles like dovetailed (or) re-entrant profiles, rectangular profiles and trapezoidal profiles are used in the present investigation. This experimental investigation deals with the evaluation of various parameters such as the ultimate load carrying capacity versus deflection, load versus slip, ductility ratio, strain energy and modes of failure in composite slab specimens with varying profiles. From the test results the performance of dovetailed profiled composite slabs’ resistance is significantly higher than the other two profiled composite deck slabs.

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