First published to address a gap in the industry, this standard provides the dimensional and material requirements for valves specifically used in instrumentation systems. While larger valves (like gate or ball valves) are covered by ASME or API standards, smaller instrument valves often fell into a gray area until MSS SP-99 was established.
Blowout-proof stems and documented pressure ratings minimize the risk of fugitive emissions or explosive decompressions.
A critical safety feature requiring stems to be blowout-proof. The stem cannot dislodge under pressure if the packing nut or gland loosens.
Because standards are intellectual property protected by copyright laws, official copies of the are not legally available for free download on the public internet. mss sp99 pdf
These components are typically found in:
It provides the exact dimensions, wall thicknesses, and pressure ratings required to model safe piping and instrumentation diagrams (P&IDs).
Inspectors use the testing benchmarks in the document to audit manufacturers and review Material Test Reports (MTRs). How to Access an Authentic MSS SP-99 PDF First published to address a gap in the
An MSS SP-99 PDF typically includes the following critical sections for manufacturers and engineers:
The MSS SP-99 standard ensures reliability, safety, and uniformity across the industry. Key aspects covered in the standard include: 1. Performance-Based Design
Utilizing a recognized ANSI standard helps organizations comply with safety regulations. How to Obtain the MSS SP-99 PDF A critical safety feature requiring stems to be
A valve cannot claim compliance with MSS SP-99 based on design geometry alone; it must undergo rigorous physical testing. The standard dictates two primary types of hydrostatic and pneumatic tests:
: Includes ratings up to 15,000 psi (103.4 MPa) at 100∘F100 raised to the composed with power F ( 38∘C38 raised to the composed with power C ).