It seems you're asking about the paper MSS SP-99 (likely referring to the standard MSS SP-99-2019: Instrument Valves). While I can’t provide a direct PDF file (copyright restrictions), here’s how you can access it legitimately and why the paper is useful:
Where to obtain MSS SP-99 PDF:
- MSS (Manufacturers Standardization Society) – Official store: mss-hub.org
- Techstreet or IHS Markit – Authorized resellers of MSS standards.
- Engineering document libraries – Some university or corporate subscriptions include MSS standards.
Why MSS SP-99 is a useful paper (key content):
- Scope: Covers design, materials, pressure-temperature ratings, and testing for instrument valves (needle, block-and-bleed, gauge, manifold valves).
- Applications: Critical for chemical, petrochemical, oil & gas, and power generation systems where reliable isolation and venting are needed for pressure gauges, transmitters, and switches.
- Key requirements:
- Thread connections (NPT, ISO) and tube fittings.
- Material traceability (e.g., 316 SS, carbon steel).
- Leak testing (hydrostatic and pneumatic).
- Marking and pressure rating at temperature.
- Commonly referenced with: ASME B16.34, ASME B1.20.1, API 6A.
If you need a summary or comparison (e.g., between MSS SP-99 and ASME B16.34 for instrument valves), let me know—I can explain the differences and typical usage.
MSS SP-99 is the industry standard practice for Instrument Valves, specifically focusing on small valves and manifold valves used in control and sampling piping systems. The most recent version was published in April 2023 as MSS SP-99-2023 . Standard Scope & Application
Valve Types: Applies to needle, packless, ball, plug, check, and manifold valves.
Size Range: Covers steel and alloy valves with a Nominal Pipe Size (NPS) 2 and smaller.
Pressure Ratings: 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 ).
Primary Use: Instrument, control, and sampling piping systems. Note that for specific code applications, MSS SP-105 should be consulted. Core Content of the PDF
The standard provides a uniform specification for manufacturers and users, covering the following key sections:
Materials: Specifies acceptable steel and alloy materials for pressure-boundary parts.
Design Requirements: Outlines construction and performance guidelines, though it does not strictly limit proprietary designs.
Testing: Includes procedures for qualification tests (to prove a design) and acceptance testing (for individual units).
Marking: Requirements for permanent identification, including manufacturer name, material, and pressure rating. Accessing the Official Guide
As a copyrighted document from the Manufacturers Standardization Society (MSS), the full guide is not legally available for free download as a complete PDF. You can obtain it through authorized distributors:
Official Purchase: Available in both electronic (PDF) and book formats at the MSS Webstore or the ANSI Webstore.
Preview Only: Limited preview pages (foreword and table of contents) are often hosted on the ANSI Webstore. Key Definitions Term Definition Cold Working Pressure (CWP) Max allowable working pressure at ambient conditions (- 20∘F20 raised to the composed with power F to 100∘F100 raised to the composed with power F ). Manifold Valve Two or more instrument valves built into a single body. Packless Valve
A valve using a diaphragm or bellows instead of traditional packing. MSS SP-99 - Manufacturers Standardization Society
MSS SP-99 (Instrument Valves for Code Applications) is a standard practice that covers the design, materials, and testing of small valves and manifolds commonly used in instrument, control, and sampling piping systems. Key Details for 2026:
Current Edition: The most recent version is MSS SP-99-2023, published in April 2023.
Scope: Covers steel and alloy valves NPS 2 (nominal pipe size) and smaller, with pressure ratings up to 15,000 psi (
Applicability: Applies to needle valves, ball valves, check valves, packless valves, and manifold valves.
Where to Purchase: The official, secure PDF can be purchased and downloaded directly from the MSS Headquarters website or ANSI Webstore. Key Considerations:
Pressure Ratings: Manufacturers provide pressure ratings for temperatures above
Materials: Commonly includes forged stainless steel or alloy steels, with requirements on leached or resulfurized grades.
Testing: The standard covers qualification tests (hydrostatic proof and burst) and acceptance tests.
Difference from other specs: For other instrument valve applications, refer to MSS SP-105. Find compatible piping for NPS 2 and smaller. Review marking requirements for the valves. MSS SP-99-2023 | PDF - Scribd
Understanding the MSS SP-99 Standard for Instrument Valves The MSS SP-99 standard is a critical industrial specification established by the Manufacturers Standardization Society (MSS). It provides a common framework for the design, testing, and performance of small valves and manifolds used primarily in instrumentation, control, and sampling systems. Scope and Application
MSS SP-99 applies to a specific range of steel and alloy valves characterized by their compact size and high-pressure capabilities:
Size: Covers valves with a Nominal Pipe Size (NPS) 2 and smaller.
Pressure Rating: Applies to ratings up to 15,000 psi (103.4 MPa) at 100°F (38°C).
Valve Types: Includes needle valves, ball valves, plug valves, check valves, packless valves, and manifold valves. Key Technical Requirements
The standard ensures reliability in high-pressure measurement and control applications by detailing specific requirements:
Performance Standards: It sets benchmarks for reducing leakage risks and maintaining system integrity in critical process instrumentation.
Testing Procedures: Manufacturers must conduct mandatory tests, including hydrostatic proof tests (typically at twice the CWP rating) and burst tests to verify structural integrity.
Design Flexibility: MSS SP-99 is not intended to limit proprietary designs or envelope dimensions, allowing manufacturers to innovate while meeting core safety and performance criteria.
Temperature Ratings: While the base rating is at 100°F, manufacturers are responsible for providing adjusted pressure ratings for higher temperatures. Versions and Availability
The standard is periodically revised to reflect modern engineering practices. Recent editions include: MSS SP-99-2023: Instrument Valves - The ANSI Blog
Could you please specify what you mean by "create a feature"? For example:
- Extract a feature from the PDF (e.g., table, diagram, specific clause)?
- Summarize a key feature of MSS SP-99 (e.g., pressure/temperature ratings, design requirements, materials)?
- Generate a new technical feature for a product based on MSS SP-99?
- Create a document feature in a PDF tool (like bookmark, annotation, form field)?
If you are looking for a summary of the main features of MSS SP-99, here are the key points typically covered in that standard:
- Scope: Instrument valves (needle, ball, and gauge valves) for process and instrumentation connections.
- Pressure-Temperature Ratings: Class-based ratings (e.g., 150, 300, 600, 1500, 2500).
- Design Features:
- Stem threads isolated from system media.
- Packing adjustment capability under pressure.
- Blowout-proof stem design.
- Materials: Common materials (carbon steel, stainless steel, etc.) with corrosion allowances.
- Testing: Hydrostatic shell test, seat leakage test (usually bubble-tight).
- Marking: Permanent marking requirements for material, rating, and size.
If you meant something else, please clarify, and I’ll be glad to help!
Tips for Using the Document
- Check the Material Group: When reviewing the pressure tables, ensure you are looking at the correct material group chart. A Carbon Steel valve has different ratings than a Stainless Steel valve at high temperatures.
- Identify the Valve Type: The standard covers both Instrument Needle Valves and Instrument Ball Valves. The dimensions and ratings may differ between these types.
- Verify End Connections: Ensure the dimension tables you are reading match your connection type (e.g., Threaded NPT vs. Socket Weld).
Free Alternatives (Non-Copyright Infringing)
If you cannot afford the $150–$300 fee for the PDF, consider:
- Engineering toolbox websites – They often summarize the key tables (e.g., pressure ratings).
- University libraries – Many engineering schools have MSS subscriptions.
- Vendor catalogs – Companies like Swagelok, Parker, or Hoke provide “compliance to MSS SP-99” sections in their technical datasheets (not the full standard, but usable).
Q2: What is the difference between MSS SP-99 and MSS SP-95?
A: MSS SP-95 covers Swage(d) Nipples and Bull Plugs, which are also used in small-bore piping but are not instrument valves. SP-99 is specifically for valves and fittings with moving parts (stems, balls, seats).