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TitleMSS SP-105 (10)
TagsValve Pipe (Fluid Conveyance) Building Materials Gases
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Page 1

MSS SP-105-2010




Instrument Valves
for

Code Applications


Standard Practice
Developed and Approved by the
Manufacturers Standardization Society of the
Valve and Fittings Industry, Inc.
127 Park Street, NE
Vienna, Virginia 22180
Phone: (703) 281-6613
Fax: (703) 281-6671
e-mail: [email protected]

www.mss-hq.org

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Page 2

MSS STANDARD PRACTICE SP-105


i


This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 115 and the
MSS Coordinating Committee. The content of this Standard Practice is the result of the efforts of competent
and concerned volunteers to provide an effective, clear, and non-exclusive specification that will benefit the
industry as a whole. This MSS Standard Practice is intended as a basis for common practice by the
manufacturer, the user, and the general public. The existence of an MSS Standard Practice does not in itself
preclude the manufacture, sale, or use of products not conforming to the Standard Practice. Mandatory
conformance is established only by reference in a code, specification, sales contract, or public law, as
applicable.



"Unless otherwise specifically noted in this MSS Standard Practice, other standards referred
to herein are identified by the date of issue that was applicable to this Standard Practice at
the date of issue of this Standard Practice. See Annex A. This Standard Practice shall remain
silent on the applicability of those other standards of prior or subsequent dates of issue even
though applicable provisions may not have changed. References contained herein which are
bibliographic in nature are noted as ‘supplemental’ in the text.”




Substantive changes in this 2010 edition are “flagged” by parallel bars as shown on
the margins of this paragraph. The specific detail of the change may be determined
by comparing the material flagged with that in the previous edition.







Any part of this Standard Practice may be quoted. Credit lines should read `Extracted from MSS SP-
105-2010 with permission of the publisher, Manufacturers Standardization Society of the Valves and
Fittings Industry, Inc.'. Reproduction is prohibited under copyright convention unless written
permission is granted by Manufacturers Standardization Society of the Valve and Fittings Industry Inc.




Originally Approved: July 1990
Originally Published: October 1990
Current Edition Approved: May 2010
Current Edition Published: September 2010





Copyright ©, 1990, 1996, 2010 by

Manufacturers Standardization Society
of the

Valve and Fittings Industry, Inc.
Printed in U.S.A.





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Page 5

MSS STANDARD PRACTICE SP-105


2

3.4 Certified material test reports shall be
obtained for pressure boundary parts
materials. Certifications shall include chemical
analysis and mechanical properties.

4. DESIGN REQUIREMENTS

4.1 Valves designed in accordance with this
Standard Practice shall have their working
pressure established by calculation,
hydrostatic proof and burst tests or both as
specified in Section 5.

4.1.1 Qualification of valves designed to
Section 4.1 shall be conducted on each design
and size of valve to establish the CWP rating.

4.1.2 The CWP rating of valves of identical
design and size but made of different
materials shall be proportional to the
allowable stress of each material or may be
determined by hydrostatic qualification tests
on valves made of each material, at the
manufacturer’s option.

4.1.3 The CWP rating of valves of identical
design and size but with different end
connections shall be determined by the rating
of the valve or the end connection, whichever
is less.

4.1.4 The CWP rating of a valve design
may be established by the manufacturer at a
value lower than the rating allowed by the
qualification tests of Section 5. In that case
the lower pressure rating may be established
for a valve design and size, regardless of
materials or end connections. Such reduced
ratings are usually dictated by performance
limitations such as operating torque, cycle
life, or non-metallic component limitations.

4.1.5 Packing nut adjustment may be
necessary to compensate for temperature
change.

4.1.6 The manufacturer shall provide
pressure ratings for temperatures above
100°F. This temperature is the temperature of
the pressure containing shell of the
component. In general, this temperature is the
same as that of the contained fluid. Use of a
pressure rating corresponding to a

temperature other than that of the contained
fluid is the responsibility of the user, subject
to the requirements of applicable codes and
regulations.

4.2 End connections

4.2.1 Pipe Threads Tapered pipe threads
shall be in accordance with one of the
following:

a) ASME B1.20.1

b) ASME B1.20.3

c) CGA V-l

4.2.2 Pipe Socket Weld Connections The
socket bore diameter and the depth of socket
shall be in accordance with the dimensions
and tolerances of ASME B16.11.

4.2.3 Tube socket weld dimensions shall be
in accordance with the manufacturer’s
standard.

4.2.4 Butt weld connections for pipe shall
have an end preparation in accordance with
ASME B16.25.

4.2.5 Butt weld connections for tube shall be
in accordance with the manufacturer’s
standard.

4.2.6 Pipe or tube stub extension end
connections may be socket welded or butt
welded to the valve. The diameter and wall
thickness shall be the manufacturer’s
standard. The standard stub extension lengths
are 3” or 6”, measured from the end of the
valve.

4.2.7 Mechanical tube fittings shall be in
accordance with the manufacturer’s design.
Fittings may be machined integral with,
welded to, or threaded to the valve body.

4.2.8 Weld qualifications for end
connections welded to the valve body shall
be in accordance with ASME Boiler and
Pressure Vessel Code, Section IX.

4.2.9 Other end connections not listed
herein may be provided as agreed upon by
the manufacturer and purchaser.

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Page 6

MSS STANDARD PRACTICE SP-105


3

4.3 Direct Mounted Instrument Manifold
Gasket Groove and Flange Details The
standard groove for gaskets and minimum
flange or plate thickness shall be per Figure 1.
Other groove dimensions shall be considered
special.

5. QUALIFICATION

5.1 General Valve designs shall be qualified
by calculation and hydrostatic proof or
hydrostatic proof and burst tests at the option of
the manufacturer.

5.2 Documentation

5.2.1 Hydrostatic proof and burst tests shall
be conducted in accordance with the
manufacturer’s written procedure. Copies of
the test procedure and test reports shall be
kept on file by the manufacturer.

5.2.2 Stress and pressure rating calculations
shall be in accordance with the methods in
this Standard Practice. Copies of the
calculations shall be kept on file by the
manufacturer.

5.3 Test Valves Valves shall have their
ratings confirmed by testing three (3)
production valves by the method described in
Section 5.5.

5.3.1 Similar valves of the same size and
design, but having minor modifications, may
also be considered qualified. Where those
modifications would increase the level of
stress in pressure boundary parts, the rating
must be reduced proportionately to the ratio
of the stresses. Stresses are to be calculated
as specified in Section 5.8. If the materials
have different strengths, the ratio of material
allowable stresses shall also be used to
determine the new rating.

5.4 Material Properties The actual tensile
and yield strength of the pressure boundary
parts of the test specimens shall be obtained
from heat traceable material certifications or
by submitting sample material from the same
lot to testing in accordance with the
procedures of the ASME Boiler and Pressure
Vessel Code, Section VIII, Article UG-101 (J).

5.5 Proof Test Procedure

5.5.1 Each test valve shall pass a
hydrostatic proof test in accordance with the
following minimum requirements:

a) Fluid: Water or hydraulic oil

b) Temperature: 50°F to 125°F

c) Pressure: Two times the CWP rating

d) Time: One minute, minimum, at proof
pressure

e) Position: Placed in all positions
capable of subjecting pressure
boundary components to internal
pressure.

5.5.2 There shall be no visible leakage
during the proof test at any pressure
containing part, joint, or seal.

5.5.3 The stem packing may be adjusted
during the proof test to stop leakage. No
other adjustments are permitted on any other
pressure boundary joints or seals.

5.6 Burst Test Procedure

5.6.1 Each test valve shall be
hydrostatically shell tested to failure by
rupture. The hydrostatic pressure at which
rupture occurs shall be recorded. The same
valves used for the proof test shall be used
for the burst test.

5.6.2 Leakage is permitted at the valve
packing, gaskets, and pressure retaining
joints during the burst test, at pressures above
the proof pressure.

5.6.3 If the hydrostatic test is stopped
before rupture occurs, the highest sustained
pressure attained shall be considered the burst
pressure for that valve.









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Page 10

MSS STANDARD PRACTICE SP-105


7













ANNEX A (Continued)


Referenced Standards and Applicable Dates



This Annex is an integral part of this Standard Practice and is placed after the main text for convenience.


Publications of the following organizations appear on the previous page:

ANSI American National Standards Institute, Inc.
25 West 42nd Street, Fourth Floor
New York, NY 10036-7406

ASME American Society of Mechanical Engineers
Three Park Avenue
New York, NY 10016-5990

CGA Compressed Gas Association
4221 Walney Road, Fifth Floor
Chantilly, VA 20151-2923

MSS Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.
127 Park Street, N.E.
Vienna, VA 22180-4602



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Page 11

Listing of MSS Standard Practices
TITLE
SP-6-2007 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
SP-9-2008 Spot Facing for Bronze, Iron and Steel Flanges
SP-25-2008 Standard Marking System for Valves, Fittings, Flanges, and Unions
SP-42-2009 Corrosion Resistant Gate, Globe, Angle and Check Valves with Flanged and Butt Weld Ends (Classes 150, 300 & 600)
SP-43-2008 Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications (Incl. 2010 Errata Sheet)
SP-44-2010 Steel Pipeline Flanges
SP-45-2003 (R 2008) Bypass and Drain Connections
SP-51-2007 Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings
SP-53-1999 (R 2007) Quality Standard for Steel Castings and Forgings for Valves, Flanges, and Fittings and Other Piping Components - Magnetic Particle
Examination Method
SP-54-1999 (R 2007) Quality Standard for Steel Castings and Forgings for Valves, Flanges, and Fittings and Other Piping Components - Radiographic

Examination Method
SP-55-2006 Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components - Visual Method for Evaluation of
Surface Irregularities
SP-58-2009 Pipe Hangers and Supports - Materials, Design, Manufacture, Selection, Application, and Installation (incorporates content of SP-69, 77*, 89*, and 90*)
SP-60-2004 Connecting Flange Joint Between Tapping Sleeves and Tapping Valves
SP-61-2009 Pressure Testing of Valves
SP-65-2008 High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets
SP-67-2002a Butterfly Valves
SP-68-1997 (R 2004) High Pressure Butterfly Valves with Offset Design
SP-69-2003 Pipe Hangers and Supports - Selection and Application (ANSI-approved American National Standard)
SP-70-2006 Gray Iron Gate Valves Flanged and Threaded Ends
SP-71-2005 Gray Iron Swing Check Valves, Flanged and Threaded Ends
SP-72-2010 Ball Valves with Flanged or Butt-Welding Ends for General Service
SP-75-2008 Specification for High-Test, Wrought, Butt-Welding Fittings
SP-78-2005a Gray Iron Plug Valves Flanged and Threaded Ends
SP-79-2009 Socket Welding Reducer Inserts
SP-80-2008 Bronze Gate, Globe, Angle, and Check Valves
SP-81-2006a Stainless Steel, Bonnetless, Flanged Knife Gate Valves
SP-83-2006 Class 3000 Steel Pipe Unions Socket Welding and Threaded
SP-85-2010 Gray Iron Globe & Angle Valves Flanged and Threaded Ends
SP-86-2009 Guidelines for Metric Data in Standards for Valves, Flanges, Fittings, and Actuators
SP-88-2010 Diaphragm Valves
SP-91-2009 Guidelines for Manual Operation of Valves
SP-92-1999 MSS Valve User Guide
SP-93-2008 Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components - Liquid Penetrant
Examination Method
SP-94-2008 Quality Standard for Ferritic and Martensitic Steel Castings for Valves, Flanges, Fittings, and Other Piping Components - Ultrasonic
Examination Method
SP-95-2006 Swage(d) Nipples and Bull Plugs
SP-96-2001 (R 2005) Guidelines on Terminology for Valves and Fittings
SP-97-2006 Integrally Reinforced Forged Branch Outlet Fittings - Socket Welding, Threaded, and Buttwelding Ends
SP-98-2001 (R 2005) Protective Coatings for the Interior of Valves, Hydrants, and Fittings
SP-99-2010 Instrument Valves
SP-100-2009 Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Valves
SP-101-1989 (R 2001) Part-Turn Valve Actuator Attachment - Flange and Driving Component Dimensions and Performance Characteristics
SP-102-1989 (R 2001) Multi-Turn Valve Actuator Attachment - Flange and Driving Component Dimensions and Performance Characteristics
SP-104-2003 Wrought Copper Solder Joint Pressure Fittings
SP-105-2010 Instrument Valves for Code Applications
SP-106-2003 Cast Copper Alloy Flanges and Flanged Fittings Class 125, 150 and 300
SP-108-2002 Resilient-Seated Cast-Iron Eccentric Plug Valves
SP-109-1997 (R 2006) Welded Fabricated Copper Solder Joint Pressure Fittings
SP-110-2010 Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends
SP-111-2001 (R 2005) Gray-Iron and Ductile-Iron Tapping Sleeves
SP-112-1999 (R 2004) Quality Standard for Evaluation of Cast Surface Finishes - Visual and Tactile Method. This SP must be used with a 10-surface,

three dimensional Cast Surface Comparator, which is a necessary part of the standard. Additional Comparators available separately.
SP-113-2001 (R 2007) Connecting Joint between Tapping Machines and Tapping Valves
SP-114-2007 Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000
SP-115-2010 Excess Flow Valves, 1 1/4 NPS and Smaller, for Fuel Gas Service
SP-116-2003 Service-Line Valves and Fittings for Drinking Water Systems
SP-117-2006 Bellows Seals for Globe and Gate Valves
SP-118-2007 Compact Steel Globe & Check Valves - Flanged, Flangeless, Threaded & Welding Ends (Chemical & Petroleum Refinery Service)
SP-119-2010 Factory-Made Wrought Belled End Pipe Fittings for Socket-Welding
SP-120-2006 Flexible Graphite Packing System for Rising Stem Steel Valves - Design Requirements
SP-121-2006 Qualification Testing Methods for Stem Packing for Rising Stem Steel Valves
SP-122-2005 Plastic Industrial Ball Valves
SP-123-1998 (R 2006) Non-Ferrous Threaded and Solder-Joint Unions for Use with Copper Water Tube
SP-124-2001 Fabricated Tapping Sleeves
SP-125-2010 Gray Iron and Ductile Iron In-Line, Spring-Loaded, Center-Guided Check Valves
SP-126-2007 Steel In-Line Spring-Assisted Center Guided Check Valves
SP-127-2001 Bracing for Piping Systems Seismic-Wind-Dynamic Design, Selection, Application
SP-128-2006 Ductile Iron Gate Valves
SP-129-2003 (R 2007) Copper-Nickel Socket-Welding Fittings and Unions
SP-130-2003 Bellows Seals for Instrument Valves
SP-131-2010 Metallic Manually Operated Gas Distribution Valves
SP-132-2010 Compression Packing Systems for Instrument Valves
SP-133-2010 Excess Flow Valves for Low Pressure Fuel Gas Appliances
SP-134-2010 Valves for Cryogenic Service Including Requirements for Body/Bonnet Extensions
SP-135-2010 High Pressure Knife Gate Valves
SP-136-2007 Ductile Iron Swing Check Valves
SP-137-2007 Quality Standard for Positive Material Identification of Metal Valves, Flanges, Fittings, and Other Piping Components
SP-138-2009 Quality Standard Practice for Oxygen Cleaning of Valves & Fittings
SP-139-2010 Copper Alloy Gate, Globe, Angle, and Check Valves for Low Pressure/Low Temperature Plumbing Applications
(R YEAR) Indicates year standard reaffirmed without substantive changes  Price List Available Upon Request
* SP-77, 89, and 90 have been withdrawn effective 8/23/2010; however, the contents of these SPs are now part of newly revised SP-58-2009.
MSS is an ANSI-accredited American National Standards developer. A number of former MSS Standard Practices have been adopted and published by other developers
as American National Standards. In order to maintain a single source of authoritative information, MSS has withdrawn its Standard Practices in such cases.


Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.
127 Park Street, N.E., Vienna, VA 22180-4620 • (703) 281-6613 • Fax # (703) 281-6671

MSS-IHS SP-105-2010
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