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TitleMSS SP 55 2006 Scaned
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Page 1

MSS SP-55-2006

Quality Standard for Steel Castings
for Valves.;. F.~anges, Fittings, and

Other Piping Components

Visual Method
for

EvaluatiOn of Surface Irregularities

Standard Practice
Developed and Approved by the
Manufacturers Standardization Society of the
Valve and Fittings Industry, Inc.
127 Park Street, N E
VIenna, Virginia 22180
Phone: (703) 281-6613
Fax:(703)281~71
E-mail: [email protected]

C-vtMSS
PrcMdod 11¥ IHS undol'lc- wM11 MSS
No roproduction or nolworlclng ponnlhod wlhout •-•from IHS

www.mss-hq.org

Page 2

Capyridlt MSS

MSS STANDARD PRACTICE SP-55

This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 304 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 a.~ 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 confonning 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 SP, any standard referred to herein is identified by the date
of issue that was applicable to the referenced standard(s) at the date of issue of this MSS SP. (See Annex
A.)

Non-toleranced dimensions in~Standard Practice are .nominal, and,_ unless otherw~_JPecified, s_halJ be .-
considered "for reference only".

In this Standard Practice all notes, annexes, tables, and figures are construed to be essential to the
understanding of the message of the standard, and are considered part of the text unless noted as
"supplemental". All appendices appearing in this document are construed as "supplemental".
Supplemental'' information does not include mandatory requirements.

U.S. customary units in this SPare the standard; the metric (SI) units are for reference only.

Any part of this standard may be quoted. Credit lines should read 'Extractedfrom MSS SP-55, 2006 with
permission of the publisher, the Manufacturers Standardization Society.' Reproduction prohibited under
copyright convention unless written pennission is granted by the Manufacturers Standardization Society of
the Valve and Fittings Industry Inc.

Originally Approved April, 1961

Copyright ©, 1985 by
Manufacturers Standardization Society

of the
Valve and Fittings Industry, Inc.

Printed in U.S.A.

Prollidod by IHS unclor lic.,oa wilh MSS
No rwproducllon or n-orlclng-- willux.t • ..., .. torn IHS

Page 9

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~C.CEPTABLE NON:~. ic.EPTABL.E

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d

NOTE: The two acceptable uampl•, of this
type do not show hot tears or crad s.
No irregularities of this Type are
acceptable 111der this standGrd.

TYPE I
HOT TEARS AND CRACKS

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Page 18

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Page 19

Number

List of MSS Standard Practices
(Price List Available Upon Request)

SP-6-2001 Standard Finishes tor Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
SP-9-2001 (A 05) Spot Facing for Bronze, Iron and Steel Flanges
SP-25-1998 Standard Mar1dng System for Valves, Fittings, FIW~ges aro Unions .
SP-42-2004 Class 150 Corrosion Resistant Gate, Glove, Angle and Check Valves with Flanged and Butt Weld Ends
SP-43-1991 (R 01) Wrought Stainleu·Stelll Butt-Welding Fittings
SP-44-2006 Steel Pipeline Flanges •
SP-45-2003 Bypass and Drain Connections
SP-51·2007 Class 150LW Corrosion Resistant Flanges and Cut Ranged Fittings
SP-53-1999 (R 07) Qually Standard for Steel Csstings and Forgngs for Valves, Flanges anct Fittings and Other Piping Components • Magnetic Particle

Ex!rnination 1\Aethod
SP-54-1999 (R 07) Quality Standard for Steel Castings for Valves, Falges, and Fittings and Other Piping Components- Radiographic Examination Method
SP-55-2Q06 Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other P1ping Components- Visual Method lor Evaluation of

Surface Irregularities
SP-58-2002 Pipe Hangers and Supports • Materials, Design and Mll'lufaclure
SP-60-2004 Connecting Flange Joint Between Tapping Sleeves and Tapping Valves
SP-E11-2oo3 Pressure Testing of Steel Valves
SP-65-2004 Hgh Pressure Chemical InduStry Flanges and Threaded Stubs for Use with Lens Gaskets
SP-EI7·2002a But1erfly Valves
SP-68-1997 (R 04) High Pressure Butterfly Valves with Oltset Design
SP-69-2003 Pipe Hangers and Supports- Selection and Application (ANSIIMSS Edition)
SP-70-2006 Gray Iron Gate Valves, Flanged and Threaded Ends
SP-71-2005 Gray Iron Swing Check Valves, Flanged and Threaded Ends
SP-72·1999 Ball Valves with Flanged or Butt-welding Ends for General Service
SP-75-2004 Specification for High Test Wrought Butt Welding Fmings
SP-n-1995 (R 00) Guidelines for Pipe Support Contractual Relationships
SP-78-2005a Gray Iron Plug Valves, Flanged and Threaded Ends
SP-79"2004 Socket-Welding Reducer Inserts
SP-EI0-2003 Bronze Gate, Globe, Angle and Check Valves .
SP-61-2006 S~inless Steel, Bon~~s,.f~god, Knife Gate Valves

. ~·· ..... SP.~2006 Cfaas 3000 Steel Pipe Uiilons, Scicket·Welding 8Ad Threaded
~"'"'-:::~~~~=~~ --·-----·~·Giobe&.~Ends - - ·-- -~ ·::;_-_=-•. -::-=--::.---::::.-:;:-::: .. -·-;.:- ~
,.__ .:::~...::"'~=sP~:.'".'-·"':.~'TofriA~inSti~mrvaiVe"J;:Fral'i'!j8&:~ar.dAcluator8 -- ·--- • .· ,. ,.

C_,jlfltMSS

SP*1993 (R01) Diaphragn Valves
SP-89-2003 Pipe Hangers and Supports- Fabrication and Installation Practices
SP-90-2000 Guldallnes on Terminology for Pipe Hangers and Supports
SP-91-1992 (R 96) Guidelines tor Manual Operation of Valves
SP-92-1999 MSS Valve User Guide
SP-93-1999 (R04)Quali1y Standard for Steel Castings and Forgings lor Valves, Flanges, and Fittings and Other Piping Components- Liquid Penetrant

Examination Method
SP-94-1999 (A 04) Quality Sid for Ferrltlc and Martensitlc Steel castings for Valves, Flanges, and Fittings and Other Piping Components - Ultrasonic

Elcaminatlon Melhod
SP-95·2006 Swage(d) Nipples and Bull Plugs
SP:.s6-2001 (R 05) GLidellnes on Terminology for Valves and Fittings·
SP-97·2006 Integrally Reinforced Forged Brilnch Outlet Fitting5 ·Socket Welclng, Threaded and Buttwelding Ends
SP-98-2001 (R 06) Protective Coatings for the Interior of Valves, Hydrants, and Fittings
SP-99·1994 (R 05) Instrument Valves
SP-100·2002 Qualification Requirements lor Elastomer Dlaphrii!JTIS for Nuclear 5ervlce Diaphragm Valves
SP-101·1989 (R01) Part-Turn Valva Actuator Attachment- Flange and Driving Component Dimensions and Performance Characteristics
SP-102·1989 (R 01) Multi-Tum Valve Actuator Attat*ment- Flange and Driving Component Dimensions and Performance Characteristics
SP-104·2003 Wrought Copper Solder Joint Pressure Fittings
SP-105-1996 (R 05) Instrument Valves for Code Applcalons
SP-106-2003 cast Copper Alloy Flanges and Flanged Fittings, Class 126, 150 and 300
SP-108-2002 Resilient-Seated Cast-Iron Eccentric Plug Valves
SP-109·1997 (R 06) Welded Fabricated Copper Solder Joint Pressure Fittings
SP-110·1996 Ball Valves Threaded, Socket-Welding, SolderJont, Grooved and Flared Ends
SP-111·2001 (R 06) Gray-Iron and Ductile-Iron Tapping Sleeves
SP-112-1999 (R 04) Quality Standard for Evaluation ot cast Surface Finishes ·Visual and Tactile Method. This SP must be sold with a 10-sur1ace, three

Dimensional Cast Surface Comparator, which is a necessary part of the Standard. Additional Comparators may be sold separately.
SP-113-2001 Connecting Joint between Tapping Machines and Tapping Valves
SP-114·2001 Corrosion Ra.istant Pipe Fittings Threaded and Socket Welding, Class 150 and 1000
SP-115·2006 EKCBSS Flow Valves, 1 1/4 NPS and Smaler, for Fuel Gu Service .
SP-116·2003 Savice 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-119·2003 Factory-Made Belled End Socket Welding Fittings
SP-120·2006 Flexible Graphite Paddng System for Rising Stem Steel Valves (Design Requirements)
SP-121·2006 Qualification Testing Methods lor Stem Packing tor Rising Stem Steel Valves
SP-122-2006 Plastic ln<llstrlal Ball Valves
SP-123·1'998 (R 06) Non-Ferrous Ttnaded and Solder-Joint Unions for Use with Copper Water Tube
SP-124·2001 Fabricated Tapping Sleeves
SP-125-200o Gray Iron and Ductile Iron In-Line, Spring-Loaded, Canter-Guided Check ValveS
SP-128-2000 Steel In-Line Spring-Assisted Celier Guided Check Val'l88
SP-127·2001 Bracing for Piping Systems Seismic-Wind-Dynamic Design, Selection, Application
SP-128-2006 Ductile Iron Gala Valves
SP-129·2003 Copper-Nickel Socket-Welding Fittings and lklions
SP-130-2003 Bellows Seals for Instrument Valves
SP-131·2004 Metallic Manually Operated Gas Distribution Valves
SP-132·2004 Compression Packing Systems for Instrument Valves
SP-133-2005 Exce88 Flow ValVes for Low Preuure Fu.l Gas Appliances
SP-134-20068 Valves for Cryogenic SeMce Including Requirements for Body/Bonnet Extensions
SP-135-2006 High Pressure Steel Kola Gate Valves
(R· YEAR) lnclc&tes year standard reatnrmed whhout substantive ch8.nges

A large runber of former MSS Practices have been approved by the ANSI or ANSI Standards, pl.blishad by others. In order to mainlain a single source
of aulhorltatlva Information, the t.'ISS w111'1draws Its Standard F'ractlcell in such cases.

Manufacturers Standardization Society of the; Valve and Fittings Industry, Inc.
127 Park Street, N~E., VIenna, VA 221~20 (703) • 281-6613 Fax #(703) 281-6671

MS~SP

PRMclod ~ IHS under lie., .. with MSS
NorwpoG.dlon ot n-lnl ....--~-tom IHS

.,.

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