1、 MSS SP-148-2014 Low Pressure Flanged or Lugged Carbon Steel and Iron or Ductile Iron, Cast or Fabricated, Bonnetless, Knife Gate Valves without Liners Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE V
2、ienna, Virginia 22180-4602 Phone: (703) 281-6613 Fax: (703) 281-6671 E-mail: standardsmss-hq.org www.mss-hq.org MSS STANDARD PRACTICE SP-148i This MSS Standard Practice was developed under the consensus of the MSS Technical Committees 409 and the MSS Coordinating Committee. The content of this Stand
3、ard Practice is the resulting efforts of competent and experienced volunteers to provide an effective, clear, and non-exclusive standard that will benefit the industry as a whole. This MSS Standard Practice describes minimal requirements and is intended as a basis for common practice by the manufact
4、urer, 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 to this Standard Practice is established only by reference in other documents such as
5、 a code, specification, sales contract, or public law, as applicable. MSS has no power, nor does it undertake, to enforce or certify compliance with this document. Any certification or other statement of compliance with the requirements of this Standard Practice shall not be attributable to MSS and
6、is solely the responsibility of the certifier or maker of the statement. “Unless indicated otherwise within this MSS Standard Practice, other standards documents referenced to herein are identified by the date of issue that was applicable to this Standard Practice at the date of approval of this MSS
7、 Standard Practice (see Annex A). This Standard Practice shall remain silent on the validity of those other standards of prior or subsequent dates of issue even though applicable provisions may not have changed.” By publication of this Standard Practice, no position is taken with respect to the vali
8、dity of any potential claim(s) or of any patent rights in connection therewith. MSS shall not be held responsible for identifying any patent rights. Users are expressly advised that determination of patent rights and the risk of infringement of such rights are entirely their responsibility. In this
9、Standard Practice, all text, notes, annexes, tables, figures, and references are construed to be essential to the understanding of the message of the standard, and are considered normative unless indicated as “supplemental”. All appendices, if included, that appear in this document are construed as
10、“supplemental”. Note that supplemental information does not include mandatory requirements. The SI (metric) units and U.S. customary units in this Standard Practice are regarded separately as the standard; each should be used independently of the other. Combining or converting values between the two
11、 systems may result in non-conformance with this Standard Practice. Non-toleranced dimensions in this Standard Practice are nominal unless otherwise specified. Excerpts of this Standard Practice may be quoted with permission. Credit lines should read Extracted from MSS SP-148-2014 with permission of
12、 the publisher, Manufacturers Standardization Society of the Valve and Fittings Industry. Reproduction and/or electronic transmission or dissemination is prohibited under copyright convention unless written permission is granted by the Manufacturers Standardization Society of the Valve and Fittings
13、Industry Inc. All rights reserved. Originally Approved: May 2014 Originally Published: September 2014 MSS is a registered trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2014 by Manufacturers Standardization Society of the Valve and Fittings In
14、dustry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-148ii TABLE OF CONTENTS SECTION PAGE 1 SCOPE AND FIELD OF APPLICATION . 1 2 STANDARD UNITS 1 3 PRESSURE RATING . 1 4 SIZE 1 5 MARKING 1 6 MATERIALS 1 7 DESIGN 2 8 WELDING 2 9 TOLERANCES . 2 10 PRODUCTION TEST . 2 11 SHIPPING INFORMATION 3 12 IN
15、STALLATION 3 TABLE 1 Valve Dimensions, Inches . 4 1M Valve Dimensions, Millimeters 5 2 Materials 6 3 Equivalent Stainless Steel Grades . 6 ANNEX A Referenced Standards and Applicable Dates 7 MSS STANDARD PRACTICE SP-1481 1. SCOPE AND FIELD OF APPLICATION 1.1 This Standard Practice covers carbon stee
16、l, iron or ductile iron, cast or fabricated, bonnetless, unlined knife gate valves with flanged or lugged ends from size NPS 2 (DN 50) through NPS 60 (DN 1500). 1.2 The valves identified in this Standard Practice are intended for use in applications where shock loadings are not encountered. Applicat
17、ions at conditions other than those specified in Section 3 require special design considerations. 2. STANDARD UNITS The values stated in either U.S. customary units or SI (metric) units are to be regarded separately as the “standard”. Within the text, the SI (metric) units are shown in parenthesis.
18、The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in non-conformance with this Standard Practice. 3. PRESSURE RATING This Standard Practice covers valves with a gauge pressure r
19、ating not exceeding the values in the following table, at temperatures between 32 F and 150 F (0 C and 66 C). U.S. Customary SI (Metric) NPS psi DN bar 2 24 150 50 600 10.3 26 36 100 650 900 6.9 38 60 75 950 1500 5.2 4. SIZE The valve sizes in Table 1 (NPS) and Table 1M (DN) are the nominal sizes of
20、 the end connections. 5. MARKING The valve shall be marked in accordance with MSS SP-25, including the following requirements and modifications: a) Manufacturers name or trademark/logo. b) The body material of construction or code, when more than one material or grade of material is used, shall each
21、 be identified. The material in contact with the fluid media shall be listed and identified on the name plate. c) Since most valves are manufactured for closure in one direction only, the valve shall be marked showing the “seat side” (downstream side) of the valve in such a manner that the markings
22、can be seen with the valve installed in the pipeline. The user shall be responsible for correct directional installation. Markings shall still indicate the seat side of the valve. Bi-directional designs do not require a flow direction indicator. d) The valve shall be marked for installation purposes
23、 with a tag(s) or label(s) attached to the valve, indicating the following, or referring to the instruction manual that includes this information: 1) Care to be taken in valve installation with respect to direction of closure. 2) Care to be taken when installing studs or bolts in the tapped holes of
24、 the flange in the area of the chest to prevent chest damage. The “chest” is the body area between the packing chamber and the flanges. 3) Packing nuts may require adjustment to obtain a tight seal. e) The stem material need not be listed. LOW PRESSURE FLANGED OR LUGGED CARBON STEEL AND IRON OR DUCT
25、ILE IRON, CAST OR FABRICATED, BONNETLESS, KNIFE GATE VALVES WITHOUT LINERS MSS STANDARD PRACTICE SP-1482 6. MATERIALS Materials used for major components of these valves are listed in Table 2. Equivalent stainless steel grades are listed in Table 3. 7. DESIGN 7.1 With the exception of hard facing ov
26、erlays and coatings, all internal wetted parts shall have a corrosion resistance at least equivalent to the body. Hard face overlays (Cobalt or Ni-Cr types) on valve seating surfaces or wear surfaces are acceptable. Coatings applied to internal wetted surfaces shall be by agreement between the manuf
27、acturer and user. 7.2 Dimensions shall be in accordance with Table 1 (inches) or Table 1M (millimeters). Iron flanges shall be flat face flanges (see Note (a), Table 1 and 1M). 7.3 The design of all valves shall prevent permanent distortion of the body or seats when tested as specified in Section 10
28、. 7.4 When through-bolting is specified, valves shall have flange holes per ASME B16.1 for sizes NPS 2 (DN 50) through NPS 60 (DN 1500) for Class 125, and per ASME B16.42 Series A for sizes larger than NPS 24 (DN 600); see Table 1 (NPS) and Table 1M (DN). Flange holes in the chest area shall be tapp
29、ed in accordance with Table 1 or Table 1M, as applicable. 7.5 The valve port I.D. shall not be less than 90 percent (90%) of the nominal inside diameter of Schedule 40 pipe. 7.6 Because of variations in basic valve design, differential pressure, and valve accessibility, it is not possible to standar
30、dize the conditions under which a manually operated valve requires mechanical assistance. Consideration should be given to the use of mechanical assistance, for example gear box, bevel gear or power actuator on all valves over NPS 8 (DN 200) when the differential pressure, during valve operation, ap
31、proaches the valves rated working pressure. In addition, consideration should be given to the use of mechanical assistance on all NPS 16 (DN 400) valves and larger, regardless of differential pressure. 8. WELDING All body pressure boundary welds shall be in accordance with the ASME Boiler and Pressu
32、re Vessel Code, Section IX. 9. TOLERANCES The following tolerances shall be followed: Face-to-face: NPS 10 (DN 250) and smaller: +0.06 in. (+1.6 mm) NPS 12 (DN 300) and larger: +0.12 in. (+3.2 mm) Flange outside diameter: +0.06 in. (+1.6 mm) Bolt circle diameter drilling: +0.06 in. (+1.6 mm) Center-
33、to-center of adjacent bolt holes: +0.03 in. (+0.8 mm) 10. PRODUCTION TEST 10.1 Shell Test (Body) Each valve shall be hydrostatically pressure tested at 1.5 times the rated working pressure with no visible leakage allowed (leakage through the packing or gate seal shall not be cause for rejection). Th
34、e test fluid shall be water (which may contain a corrosion inhibitor), kerosene, or another suitable fluid provided such fluid has a viscosity that is not greater than that of water. The test fluid temperature shall not exceed 125 F (50 C). 10.2 Seat Test After the shell test, each valve shall be hy
35、drostatically pressure tested at 40 psi (2.8 bar) differential pressure in the direction of closure. Maximum permissible leakage shall be 40 ml/min/NPS (1.6 ml/min/DN). Seat test duration shall be in accordance with MSS SP-61. When bi-directional performance is required, testing in the reverse direc
36、tion from the seat shall be as per agreement between the customer and the manufacturer. MSS STANDARD PRACTICE SP-1483 11. SHIPPING INFORMATION 11.1 Valve packing nuts may be loosened prior to shipment to extend packing life. These nuts may have to be adjusted after installation. 11.2 If packing nuts
37、 are loosened for shipment there must be a tag attached indicating they have been loosened and the procedure for proper tightening at installation. 11.3 Unless indicated otherwise, valves shall be shipped with covers to protect the raised face of the flanges. 12. INSTALLATION 12.1 Mating flanges for
38、 use with cast iron valves must be flat faced and gaskets should be non-metallic full face type conforming to ASME B16.21 Tables 1 or 2. 12.2 When bolting cast iron valves to steel flanges, recommendations in Section 5.3.5 of ASME B16.5 and Section 9.5 of MSS SP-44 should be considered so as to prev
39、ent damage to the valve. 12.3 Valve packing may need to be adjusted when the valve is installed to prevent packing leakage. MSS STANDARD PRACTICE SP-1484 TABLE 1 Valve Dimensions, Inches Valve Size (NPS) Flanges Face -to-Face Outside Diameter (a)Raised Face Outside Diameter (c) Bolt Circle Diameter
40、(a) Bolting Thickness Minimum (d) Quantity(a) Tap Size (b)Clearance Hole Diameter (a) 2 3 4 6.00 7.50 9.00 3.62 5.00 6.19 4.75 6.00 7.50 4 4 8 5/8 11 5/8 11 5/8 11 0.75 0.75 0.75 0.50 0.50 0.50 1.88 2.00 2.00 5 6 8 10.00 11.00 13.50 7.31 8.50 10.62 8.50 9.50 11.75 8 8 8 3/4 10 3/4 10 3/4 10 0.88 0.8
41、8 0.88 0.63 0.63 0.63 2.25 2.25 2.75 10 12 14 16.00 19.00 21.00 12.75 15.00 16.25 14.25 17.00 18.75 12 12 12 7/8 9 7/8 9 1 8 1.00 1.00 1.12 0.75 0.75 0.81 2.75 3.00 3.00 16 18 20 23.50 25.00 27.50 18.50 21.00 23.00 21.25 22.75 25.00 16 16 20 1 8 118 7 118 7 1.12 1.25 1.25 0.88 0.94 1.00 3.50 3.50 4.
42、50 24 30 36 32.00 38.75 46.00 27.25 33.75 40.25 29.50 36.00 42.75 20 28 32 1 7 1 7 1 6 1.38 1.38 1.62 1.00 1.12 1.12 4.50 4.62 4.62 42 48 54 60 53.00 59.50 66.25 73.00 49.50 56.00 62.75 69.25 36 44 44 52 1 6 1 6 1 5 1 5 1.62 1.62 2.00 2.00 2.62 2.75 3.00 3.12 5.88 6.12 6.75 7.12 NOTES: (a) In confor
43、mance with ASME B16.1, Class 125 and ASME B16.42, Class 150. (b) Eight-thread series (8-UN) may be used for bolting greater than 1 in., as recommended by ASME B16.42 for Ductile Iron Class 150 flanges. (c) ASME B16.42, Class 150 (Class 125 does not have a raised face). (d) Includes 0.06 in. Raised F
44、ace. MSS STANDARD PRACTICE SP-1485 TABLE 1M Valves Dimensions, Millimeters Valve Size (DN) Flanges Face -to-Face Outside Diameter (a)Raised Face Outside Diameter (c) Bolt CircleDiameter (a) Bolting Thickness Minimum (b) Quantity (a) Tap Size (b)Clearance Hole Diameter (a) 50 80 100 150.0 190.0 230.0
45、 92.0 127.0 157.5 120.5 152.5 190.5 4 4 8 5/8 11 5/8 11 5/8 11 18.0 18.0 18.0 12.7 12.7 12.7 48.0 51.0 51.0 125 150 200 255.0 280.0 345.0 186.0 216.0 270.0 216.0 241.5 298.5 8 8 8 3/4 10 3/4 10 3/4 10 22.0 22.0 22.0 16.0 16.0 16.0 57.0 57.0 70.0 250 300 350 405.0 485.0 535.0 324.0 381.0 413.0 362.0
46、432.0 476.0 12 12 12 7/8 9 7/8 9 1 8 26.0 26.0 28.4 19.1 19.1 20.6 70.0 76.0 76.0 400 450 500 600.0 635.0 700.0 470.0 533.5 584.5 540.0 578.0 635.0 16 16 20 1 8 118 7 118 7 28.4 32.5 32.5 22.4 23.9 25.4 89.0 89.0 114.0 600 750 900 815.0 985.0 1170 692.5 857.0 1022 749.5 914.0 1086 20 28 32 1 7 1 7 1
47、 6 35.5 35.5 42.0 25.4 28.4 28.4 114.0 117.0 117.0 1100 1200 1400 1500 1345 1510 1685 1855 1257 1422 1594 1759 36 44 44 52 1 6 1 6 1 5 1 5 41.1 41.1 50.8 50.8 67 70 76 79 149.0 155.0 171.0 181.0 NOTES: (a) In conformance with ASME B16.1, Class 125 and ASME B16.42, Class 150. (b) Eight-thread series
48、(8-UN) may be used for bolting greater than 1 in., as recommended by ASME B16.42 for Ductile Iron Class 150 flanges. (c) ASME B16.42, Class 150 (Class 125 does not have a raised face). (d) Includes 1.5 mm Raised Face. MSS STANDARD PRACTICE SP-1486 TABLE 2 Materials MATERIAL ASTM NUMBER Stainless-Ste
49、el Plate A240/A240M Stainless-Steel Bar A276 Stainless-Steel Casting A743/A743M or A351/A351M Carbon-Steel Plate A283/A283M, A36/A36M, or A285/A285M Carbon-Steel Casting A216/A216M Iron Casting A126, Class B Ductile Iron A395, A436, A439, A536 TABLE 3 Equivalent Stainless Steel Grades WROUGHT CAST 304 CF-8 316 CF-8M 317 CG-8M 304L CF-3 316L CF-3M 317L CG-3M MSS STANDARD PRACTICE SP-1487 ANNEX A Referenced Standards and Applicable Dates This Annex is a
