UA-69298255-1 Blog Little P.Eng. for Engineers Training

August 21, 2019

ASME B31.3 is the governing standard for pressure piping in USA.  Also, ASME B31.3 is one of the more commonly used pressure piping codes in the world.  The purpose of this 15 hours piping design training course is to provide guidance and instruction in the areas of pi...

March 27, 2018

The Designer may have more than one thermal expansion or other displacement cycle conditions to consider. Cycles at lower stress ranges are substantially less damaging than cycles at higher stress ranges. ASME B31.3 uses the cycle with the highest stress range (full di...

March 16, 2018

Allowable Stress For Thermal Expansion

The allowable stress for thermal expansion and other deformation-induced stresses is substantially higher than for sustained loads. This is due to the difference between load-controlled conditions, such as weight and pressure, and...

January 16, 2018

Pipe Design Calculations Sample According to ASME B31.3 Latest Edition for pipe Rating 150#. The wall thickness design is performed for internal design pressure and design temperature.


October 2, 2017

Responding to evident need and at the request of The American Society of Mechanical Engineers, the American Standards Association initiated Project B31 in March 1926, with ASME as sole administrative sponsor. The breadth of the field involved required that membership o...

September 25, 2017

Caulked and soldered joints are only permitted in Category D Fluid Service. Caulked joints are further limited to a maximum temperature of 93°C (200°F), and provisions are required to prevent disengagement of the joints and resist the effects of longitudinal forces due...

September 21, 2017

Tubing joints are covered by para. 315, and include flared, flareless, and compression-type tube fittings. ASME B31.3 provides some listed tubing joints; however, many tubing joints used in process piping are proprietary fittings that are qualified as unlisted componen...

September 18, 2017

Most threaded joints in ASME B31.3 piping systems are made with taper threads in accordance with ASME B 1.20.1. Figure 5.1 shows a taper thread. These threaded joints are generally acceptable for Normal Fluid Service and Category D Fluid Service. Paragraph 314.1(a) sta...

September 14, 2017

Flanges are discussed in previous post (ASME B31.3 Limitations on Flanges). Additional requirements for flanged joints are provided in para. 312 of ASME B31.3. These discuss conditions where flanges with different strengths are bolted together. This can involve two fla...

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