阀门标准-MSS SP-120-2006 Flexible Graphite Packing System for Rising Stem Steel Valves - Design Requirements(天选打工人).pdf
《阀门标准-MSS SP-120-2006 Flexible Graphite Packing System for Rising Stem Steel Valves - Design Requirements(天选打工人).pdf》由会员分享,可在线阅读,更多相关《阀门标准-MSS SP-120-2006 Flexible Graphite Packing System for Rising Stem Steel Valves - Design Requirements(天选打工人).pdf(13页珍藏版)》请在得力文库 - 分享文档赚钱的网站上搜索。
1、 MSS SP-120-2006 www.mss-hq.org Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry,Inc.127 Park Street,NE Vienna,Virginia 22180(703)281-6613 Email:infomss-hq.org Flexible Graphite Packing System for Rising Stem Steel Valves-Design
2、 Requirements MSS Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSS STANDARD PRACTICE SP-120 iThis MSS Standard Practice was developed under the consensus of the MSS Technical Committee 308 and the MSS Coordinat
3、ing 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
4、manufacture,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 la
5、w,as applicable.U.S.customary units in this SP are the standard;metric(SI)units are for reference only.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 M
6、SS SP.(See Annex A).Any part of this standard may be quoted.Credit lines should read Extracted from MSS SP-120,2006,with permission of the publisher,the Manufacturers Standardization Society.Reproduction prohibited under copyright convention unless written permission is granted by the Manufacturers
7、Standardization Society of the Valve and Fittings Industry,Inc.Originally Approved March 1997 Copyright 1997 by Manufacturers Standardization Society of the Valve and Fittings Industry,Inc.Printed in U.S.A.Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networkin
8、g permitted without license from IHS-,-,-标准分享网 w w w.b z f x w.c o m 免费下载MSS STANDARD PRACTICE SP-120 ii FOREWORD This Standard Practice was developed by a cooperative effort of representatives of valve and packing manufacturers.This Standard Practice is intended primarily to be an aid for the manuf
9、acture and procurement of packing systems with design features for rising-stem steel valves that utilize flexible graphite packing.However,this does not preclude the use of these system features for other types of packing systems since this Standard Practice represents the consensus input from a bro
10、ad spectrum of industry applications.This Standard Practice shall not be construed to be effective for all pressures and types of services expected of ASME B16.34 valves.Special service applications such as low fugitive emissions control or toxic fluid may require additional or different design meas
11、ures that are outside the scope of this Standard Practice.Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSS STANDARD PRACTICE SP-120 iiiTABLE OF CONTENTS SECTION PAGE 1 SCOPE.1 2 DEFINITIONS.1 3 PACKING ASSEMBLY
12、.1 4 STEM.2 5 PACKING GLAND.2 6 PACKING CHAMBER.2 7 PACKING WASHER OR VALVE BONNET.2 TABLE 1 Packing System Details(U.S.Units).3 2 Packing System Details(Metric Units).4 FIGURE 1 Packing System Details(U.S.Units).3 2 Packing System Details(Metric Units).4 3 Stem/Bonnet Details(U.S.Units).5 4 Stem/Bo
13、nnet Details(Metric Units).6 5 Geometric Symbols Definitions.7 ANNEX A Referenced Standards and Applicable Dates.8 Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-标准分享网 w w w.b z f x w.c o m 免费下载MSS STANDARD PRACT
14、ICE SP-120 1FLEXIBLE GRAPHITE PACKING SYSTEM FOR RISING STEM STEEL VALVES-DESIGN REQUIREMENTS 1.SCOPE(1)1.1 This Standard Practice establishes material and dimensional requirements for valve packing,packing chamber,packing gland,packing washer,bonnet,and stem as they relate to the total packing asse
15、mbly.1.2 This Standard Practice applies to standard,special,and limited Class 150 through Class 4500(including intermediate classes)ASME B16.34 type steel gate,globe,and angle valves designed with rotating/rising and non-rotating/rising stems.1.3 This Standard Practice applies to valves in which a f
16、lexible graphite packing assembly is used as the primary stem-sealing system.1.4 This Standard Practice does not apply to valves that include a lantern ring as part of its packing system nor to bonnetless valves with split glands.2.DEFINITIONS 2.1 See MSS SP-96 for definitions of terms used in this
17、Standard Practice.2.2 See Figure 5 for definitions of symbols used in this Standard Practice.3.PACKING ASSEMBLY 3.1 The packing shall be composed of center and end rings or a cylinder of flexible graphite and end rings.A flexible graphite packing assembly that is NOTE:(1)This Standard Practice is no
18、t intended to apply to valves developed for and predominantly used in instrument piping systems.(See MSS SP-99 and MSS SP-105)constructed with a braided carbon or braided graphite or metal-mesh that reinforces the flexible graphite may not require end rings.The end rings shall serve as wipers and an
19、ti-extrusion devices to keep the flexible graphite in the packing chamber during operation,including stroking,of the valve.Individual center rings may contain up to 2 splits per ring to facilitate valve packing installation.Braided end rings shall contain a maximum of 1 split per ring and molded end
20、 rings shall contain a maximum of 2 splits per ring.The end ring properties shall be designed to deter the extrusion and/or erosion of the center flexible graphite rings during valve operation.Packing assemblies of flexible graphite without end rings may be used;however,the diametrical clearance spe
21、cified in Table 1 and Table 2 shall be reduced to a maximum of 50%of that required for higher than Class 300 valves.The packing shall also be qualified to the requirements of MSS SP-121.3.2 The packing assembly shall contain a dispersed passive corrosion-inhibitor,a dispersed embedded active corrosi
22、on-inhibitor,or a suitable combination of inhibitors,to minimize stem pitting caused by the galvanic corrosion phenomenon set up in a wet valve packing-chamber.Inhibitors in end rings are optional,unless otherwise specified by the purchaser.3.3 The pre-installed density and dimensions of the flexibl
23、e graphite packing shall be at the valve manufacturers option.The final adjusted density and dimensions of the packing assembly shall be capable of sealing with no visible leakage when the valve is tested at a pressure equal to the valves 100F pressure rating at ambient conditions.The as-shipped rem
24、aining packing and packing gland adjustment(packing gland tight)shall be greater than 10%of the minimum depth of the packing chamber listed in Table 1 and Table 2.Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS
25、S STANDARD PRACTICE SP-120 26.PACKING CHAMBER6.1 The dimensional tolerance of the packing chamber shall be such that the maximum diametrical clearance between gland or follower and the packing chamber(A)illustrated in Table 1 and Table 2 is not exceeded.The packing depth 4W or 5W illustrated in Tabl
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 阀门标准-MSS SP-120-2006 Flexible Graphite Packing System for Rising Stem Steel Valves Design Requir
链接地址:https://www.deliwenku.com/p-96290936.html
限制150内