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•  What is the ASME U Stamp?


We at Sure Flow stress the fact that our custom products are designed and manufactured to ASME Section VIII, Division 1, Current Edition.  Why?  This write-up provides a history and the most important sections to “Sure Flow as a manufacturer”.

Sample of Sure Flow Equipment Inc. nameplate


ASME is the acronym for American Society of Mechanical Engineers.   Founded in 1880, ASME is a professional organization focused on technical, education and research issues in the engineering and technology community.  ASME develops and maintains internationally recognized industrial and manufacturing codes and standards that enhance public safety.

In 1911, ASME formed a committee with the objective of formulating a collection of standards to govern the manufacture of steam boilers and other pressure vessels.  This need became apparent shortly after the invention of the steam engine in the late 18th century. In the 19th century there were literally thousands of boiler explosions around the world, some of which resulted in many deaths. The committee is named the Boiler and Pressure Vessel Committee.  It is currently responsible for establishing rules of safety governing the design, fabrication and inspection during construction of pressure vessels, and to interpret these rules when questions arise regarding their content.

The rules are compiled and published as the ASME Boiler and Pressure Vessels Code.  The Code is divided into 12 sections.  These sections cover topics ranging from the construction of boilers, pressure vessels, transport tanks and nuclear power plant components, to the in-service inspection for pressure integrity of nuclear components and transport tanks.  The most important sections to Sure Flow as a manufacturer of strainers are Section VIII Division 1, “Rules for Construction of Pressure Vessels”; Section II, “Materials”; Section V, “ Nondestructive Examination”; and Section IX, “Welding and Brazing Qualifications”.

Since 1916, ASME has accredited companies in the pressure vessel industry to certify that their products, services and quality system comply with the ASME Boiler and Pressure Vessel Code.  When dealing with strainers, this acceptance and certification is symbolized by the “U Stamp” for pressure vessels and “UM Stamp” for miniature pressure vessels.  Sure Flow is authorized by ASME to use the U or UM Code Symbols, as applicable, on strainers built in strict accordance with the provisions of the Code.  The Symbol on a vessel is used to confirm the stamped item is in conformance to the latest edition of the Code.

Using the ASME Code Symbol Stamp is a way of complying with the laws and regulations in all the provinces of Canada and all 50 states in the U.S.A.  In addition, it has been estimated that over 100 countries accept the ASME Boiler and Pressure Vessel Code as a means of meeting their government safety regulations.

The requirements of applying a U or UM Code Symbol to a strainer encompass the whole process from design to purchasing to production and testing. 

Starting right with the design, there are rules to be followed.  Parameters such as wall thicknesses, materials, flange ratings, welding details, and extent of nondestructive examination are determined by design conditionssuch as pressure, temperature, corrosion allowance, fluid running through the strainer, and any specific requests from the customer.  Based on these conditions a comprehensive set of calculations are prepared.  They are reviewed and approved by the ASME Inspector.

Once the design has been approved, the materials can be purchased.  Materials used must comply with the Boiler and Pressure Vessel Code, in particular Section II Parts A through D.  Material Test Reports are required for all materials.  These reports include such things as chemical analysis, heat treatment performed (as applicable) and any NDE testing results.  Review of the reports will determine if the material is in compliance with the Code requirements.  The reports are supplied by the vendor with the material.  All material must be clearly identified to trace it to the applicable Material Test Report.   The ASME Inspector will check the material and review the Material Test Reports to ensure their conformity to the Code.

Before production can begin, the Inspector will verify that the weld procedure to be used has been qualified and the welders performing the welding are certified.  This is in accordance with Section IX.  At the same time, the Inspector will inform us of the extent of his inspection on the fabrication part of the job.  Usually, he will want to see the strainer fit-up, that is the unit just before the welding is performed.  The next step is to review the unit after fabrication is complete to ensure welding was performed to Code requirements.  At the same time, he will review any nondestructive testing results.  Then he will witness a hydrostatic test performed in accordance with the requirements of Section VIII Division 1.  The final step is the application of the nameplate.  This is also witnessed by the Inspector.  The nameplate will be marked with relevant design conditions and the U or UM Code Symbol.



Manufacturing in accordance with ASME standards provides you with Sure Flow products of the highest quality, reliability and integrity.  Plus, Sure Flow is ISO 9001:2000 Certified and holds an ISO 9001:2000 Certificate of Registration from the Global Certification Network so you can be assured we provide the perfect product.

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