Prestressed concrete cylinder pipe (PCCP) has been manufactured in the United States since 1942. An American Water Works Association (AWWA) tentative standard was developed in 1949 and was made a permanent standard in 1952. Since that time, this standard has been reviewed and updated on a regular basis. PCCP offers the specifier and owner numerous advantages, including ease of installation, custom-designed fittings, superior corrosion resistance, high-flow characteristics, low maintenance costs, and product support by the manufacturer. PCCP is used extensively for a wide range of project types both in the United States and around the world.
Monday, September 30, 2013
PreStressed Concrete Cylinder Pipe (PCCP) Details
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Thursday, September 26, 2013
How to do Selection of Bolts in Piping Design
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12:10 PM
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Bolts and nuts should be selected to conform to the design specifications set out with the flange design. Care is taken to ensure that the correct grade of material is selected to suit the recommended bolting temperature and stress ranges. Material specifications for bolts are outlined in BS 4882 and ASME Section VIII.
Wednesday, September 18, 2013
Functions of Bolts in Piping Design
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12:03 PM
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The function of a bolt is to provide a clamp load or preload (Fp) to sufficiently compress and stress the gasket and resist the parting forces exerted by the hydrostatic end force and other external loads. The hydrostatic end force is created by the pressure of the internal fluid across the internal area of flange. The internal area is generally the inside diameter of the sealing element.
Tuesday, September 10, 2013
Function of Gaskets in Piping Design
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The function of a gasket is to conform to the irregularities of the flange faces to affect a seal, preventing the inside fluid from leaking out. See following figure for a typical flange-gasket arrangement:
Function of Gaskets - Typical flange gasket arrangement |
The leak performance of the gasket is dependent on the stress on the gasket during operation. Each different type of gasket has its own inherent leak-tightness capabilities. The higher the gasket stress, the higher the leak-tightness capability.
Sunday, September 8, 2013
Flange Specification and Identification Codes
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10:40 AM
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A flange is specified by the following information:
Type and Facing. The flange is specified according to whether it is, for example, ‘‘weld-neck RTJ’’ or ‘‘socket-weld RF.’’ Ring joint facing and RTJ gasket dimensions for ASME B16.5 are shown in Table A.1-6.
Current Openings in Barry Wehmiller International Resources
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2:50 AM
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Recently got an email with following openings which are of short term periods. Apply if you don't have any job or looking for job only for a short term period. However possibilities are endless and might be you get an extension. I am just guessing things now. Here are the details given below:
Wednesday, September 4, 2013
Types of Flange End Connection
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1:02 PM
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The flange-end connection defines the way in which it is attached to the pipe. The following are commonly available standard flange end types:
Weld-Neck (WN) Flange
Weld-neck flanges are distinguished from other types by their long, tapered hub and gentle transition to the region where the WN flange is butt-welded to the pipe. The long, tapered hub provides an important reinforcement of the flange, increasing its strength and resistance to dishing. WN flanges are typically used on arduous duties involving high pressures or hazardous fluids.
Sunday, September 1, 2013
Variety of Standards Used in Design and Selection of Flanges
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1:12 PM
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Flange Standards
There are a variety of standards used in the design and selection of flanges. The following codes and standards relate to pipe flanges:
ASME Codes and Standards:
B16.1 - Cast Iron Flanges and Flanged Fittings
B16.5 - Pipe Flanges and Flanged Fittings
B16.24 - Bronze Flanges and Fittings–150 and 300 Classes
B16.5 - Pipe Flanges and Flanged Fittings
B16.24 - Bronze Flanges and Fittings–150 and 300 Classes
B16.42 - Ductile Iron Pipe Flanges and Flanged Fittings–150 and 300 Classes
B16.47 - Large Diameter Steel Flanges
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