Sand from the mold trapped in the surface of the casting.
: Inspectors compare a 4 in. x 5 in. (100mm x 125mm) area of a casting against these photos to determine if a surface condition is acceptable or rejectable. 2025 Updates : The latest edition expands its scope to include iron and ductile iron castings , providing a unified basis for acceptance. Common Surface Irregularities (12 Types)
This standard was developed to establish a uniform, visual method for evaluating surface discontinuities in steel castings. It applies specifically to components used in pressure-containing applications, such as valve bodies, bonnets, flanges, and pipe fittings.
Elias tapped his desk.
He was fighting a battle against a missing document.
Downloading a digital copy of the standard provides several operational advantages: 1. Digital Portability on the Shop Floor
Whether you're in oil and gas, power generation, or chemical processing, staying up to date with this standard is vital for ensuring component reliability and safety. mss sp 55 pdf
It removes subjectivity from visual inspections, providing a "pass/fail" baseline that is recognized globally by manufacturers and end-users. Supplementary Role: It is intended to supplement ASTM specifications
– Surface folds occurring when two streams of molten metal fail to fuse properly.
: The standard industry bodies note that digital PDF copies of MSS SP-55 are intended primarily for textual reference. Because monitors and standard office printers alter image contrast, exposure, and scaling, the printed hard copy published by MSS or authorized distributors is legally required as the final authority for physical inspection and code compliance. Core Technical Structure of the Standard Sand from the mold trapped in the surface of the casting
He hit Send at 11:45 PM.
“Found it finally. Here’s the mirror.”
Developed by the Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry, Inc., MSS SP-55 is a standard practice that provides a uniform method for identifying, evaluating, and classifying surface irregularities in steel castings. (100mm x 125mm) area of a casting against
The foundry had used the MSS SP 55 1996 PDF (outdated version). That version allowed linear cold shuts up to 25 mm in length on non-pressure boundaries. However, the 2018 version explicitly bans linear cold shuts in any area subject to cyclic pressure.
If a discontinuity is suspected of exceeding depth limits, the inspector may use a depth gauge, micrometer, or replica tape. For crack verification, dye penetrant testing (PT) per ASME Section V is often used.