Even experts make errors. Avoid these traps:
Early Blue Books contained both Imperial (ASME) and Metric (DIN) tables. If you order a "DN 100" fitting from the DIN section, it has a different outside diameter (114.3 mm) than an ASME NPS 4 (also 114.3 mm? Actually, they are close but wall thickness schedules differ). Always state: "Per Blue Book page 12, ASME B16.9."
Initially intended for internal use or for clients, the book’s utility became so apparent that it was released as a commercial publication. Over the last half-century, it has undergone numerous revisions and reprints, adapting to new standards and materials while retaining its core focus on hydraulic practicality. trouvay and cauvin blue book
Once you understand the code, you can decode any fitting without the book (though you should verify).
The book contains pressure-temperature ratings for flanges per ASME B16.5. If your steam line runs at 400°C and 50 Bar, you flip to the Blue Book to confirm whether a Class 300 flange is sufficient or if you need Class 600. Even experts make errors
In the high-stakes world of industrial piping, construction, and maintenance, precision is not just a goal—it is a safety requirement. For decades, engineers, procurement specialists, and fitters across Europe, the Middle East, and Africa have relied on a single, authoritative source for dimensions, weights, and technical specifications. That source is known simply as .
Before the global harmonization of standards (like ISO or ASTM), engineers often had to juggle different piping standards. The Blue Book compiles dimensional data for steel pipes, cast iron, PVC, and other materials. It details internal and external diameters, wall thicknesses, and weights per meter, facilitating quick structural calculations. Actually, they are close but wall thickness schedules
It is more than a catalog; it is a distillation of 100 years of piping engineering into a single blue volume. It ensures that a fitting made in Korea matches a flange made in Italy on a jobsite in Texas.
The (officially titled Technical Catalogue – Butt-Weld Fittings and Flanges ) is a technical reference catalog published by the Trouvay & Cauvin Group. Despite being a "catalog," it functions as an engineering encyclopedia. It contains exhaustive tables of technical data for carbon steel, stainless steel, and alloy piping components.