Document ExQYRvzovEGO9NarK4noGpD2b

ST0447li7!3 PIPING SYSTEMS FOR DRY CHLORINE Edition 10, March 1979 CHLORINE INSTITUTE PAMPHLET 6 N Y. 10017. Additional copies of this pamphlet are available at nominal cost. Th. Chlorine Institute Inc., 342 Mad.son Ave.. New York ST0447473 ) TABLE OF CONTENTS 1.1 Scope 1.2 Definitions 1.3 Disclaimer 1.4 Approval 1.5 Revisions 1.6 Reproduction 1. INTRODUCTION 2. GENERAL >- 2.1 Precautions C 2.2 Certification 2.3 Materials 3. RECOMMENDED PIPING AND COMPONENT EQUIPMENT 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 General Service: Chlorine gas, -20F to 300F, vacua* to 150 PSI System: Class 150, carbon steel, screwed, welded and/or flanged Service: Chlorine gas or liquid, -20F to 300F, vacuum to 300 PSI System: Class 300, carbon steel, screwed, welded and/or flanged Globe Valves Ball Valves Plug Valves Non-Ferrous Metal Construction Plastic Construction Special Purpose Valves Rupture Discs Instruments 4. PIPING LAVOUT 4.1 General 4.2 Liquid Expansion Protection 4.3 Condensation I I S. 5.1 Cleaning 5.2 Hydrostatic Testing 5.3 Drying 5.4 Gas Testing 5.5 Finding Leaks PREPARATION FOR USE 6. REFERENCES 6.1 ANSI Standards 6.2 ASTM Specifications 6.3 Federal Specifications 6.4 Others 6.5 Institute ST0447474 ST0447475 - 1. INTRODUCTION 1.1 SCOPE This publication Is Intended to provide useful Information concerning chlorine pipine systems. Tne requirements of chlorine producing plants and of processing plants using large piping or reactors have not been considered. It lists selected pipe, valves and fittings suitable for use with dr^ chlorine in either the liquid or gaseous phase, at temperatures between -20F and +300&F. (See 53.1) Users should select suitable equipment for their purpose on sound engineering principles. (See 11.3). Tne Chlorine Institute does not approve, rate, certify, or endorse any product or construction except for certain equipment used in transportation. In each such case, there is an approved Chlorine Institute drawing. Manufacturers of equipment which does not comply in every respect with such drawings are not authorized to use the Chlorine Institute name in advertising. To properly fit the detailed scope outlined above, the former title of this pamphlet "Piping and Equipment for use with Dry Chlorine" has been changed to "Piping Systems for Dry Chlorine" beginning with Edition 9. 1.2 DEFINITIONS In this pamphlet the following meanings apply unless otherwise noted: ANSI means American National Standards Institute, Inc. ASHE means American Society of Mechanical Engineers ASTM means American Society for Testing and Materials CWP means cold working pressure Chlorine means elemental chlorine, liquid or gaseous, and dry, as defined in the Institute's Chlorine Manual Institute means The Chlorine Institute, Inc. NGO means national gas outlet thread NGT means national gas taper thread NPT means American standard taper pipe thread OD means outside diameter OStY means outside screw and yoke PS1 means pounds per square Inch gage SAE means Society of Automotive Engineers - - SCfW-means standard cubic feet per minute (60OF and 14.7 PSIA) 1.3 DISCLAIMER The information In this pamphlet is drawn from sources believed to be reliable. The Institute and its members, jointly and severally, make no guarantee, and assuite no liability. In connection with any of this Information. Moreover, It should not be assumed that every acceptable procedure Is included, or that special circumstances may not warrant modified or additional procedure. The user should be aware that changing technology or regulations may require a change In the recommen dations herein. Appropriate steps should be taken to insure that the information Is current when used* These suggestions should not be confused with federal, state, provincial, municipal or Insurance requirements, or wl-th national safety codes. 1.4, APPROVAL The Institute's Coimilttee on Container Specifications and Safety approved Edition 10 of this pamphlet at a meeting held on February 6, 1979. 1.5 REVISIONS Suggestions for revisions should be directed to the Secretary of the Institute. 1.6 REPRODUCTION The contents of this pamphlet are not to be copied for publication, In whole or In part, without prior Institute permission. ST0447475 2. GENERAL 2.1 PRECAUTIONS Chlorine Is a hazardous material. It exists as a liquid or gas under pressure. It is toxic For general precautions in chlorine handling, the reader should refer to the Institute's Chlorine Manual. In particular, care must be taken to assure that all piping is thoroughly purged of chlorine before welding. Chlorine can support combustion of carbon steel. 2.2 CERTIFICATION Manufacturers or suppliers must certify to tne user, when requested, that their product is suit able for chlorine in the specified service. 2.3 MATERIALS 2.3.1 In general, steel piping is recommended for handling dry chlorine. Fine grain practice carbon steel pipe such as ASTM A587 can be cold bent but ordinary carbon steel pipe should be normalized after bending. To insure rigidity and to provide Increased protection from outside abuse, pipe of 3/A" nominal size or larger should be used. Non-ferrous and non-metallic tubing and fittings of appropriate size, see 53.7 and 53.8, may also be used. Ordinary forms of grey iron or malleable iron fittings and general purpose valves are not recommended for chlorine service. Porcelain valves must not be used. Ouctile iron per ASTM A 395 may be used for pressure reducing valves, ball and plug valves and strainers designed for chlorine gas service only. N 2.3.2 Where reference is made to specific materials, other materials may be used provided the user has evidence that the alternate materials are equal or better in the intended service. j l- 2.3.3 Screwed and socket weld joints are recommended for sizes up to 1-1/2". Butt weld and flanged joints are recomnended for all sizes. l: n 3.1 GENERAL 3. RECOMMENDED PIPING AND COMPONENT EQUIPMENT 3T0U47iJ8 This section provides a minimal specification for the components of piping systems. The Institute believes that these materials are available and are suitable for the service shown. Other materials may be used (see 2.3.2). All parts of this pamphlet should be consulted before deciding on the components of a piping system. Paragraphs 3.2 and 3.3 are organized according to operating temperatures. During certain periods, temperatures may differ. It has always been an objective of this pamphlet to offer practical suggestions in the selection of material suited for the expected service. It should be borne in mind that all recommended materials must make some compromise to accord with operating conditions and with the possible corrosive nature of chlorine particularly when moisture unintentionally enters ..the system. Temperatures below -20F may be encountered in chlorine systems and below this temperature some metals become brittle. ASTM A333 (with grades specific to the expected temperature) and with corresponding fittings has been recommended but availability has become limited. Stainless steels ofthe 300 series have useful properties for low temperature service but are subject to stress corrosion cracking particularly in the presence of moisture at ambient or elevated temperatures. The recommendations of this edition of Pamphlet No. 6 for materials other than ordinary carbon steel should be regarded as applying only to the special conditions indicated. 3.2 SERVICE: Chlorine Gas, -20F to 300F, vacuum to 150 PSI SlhStEM: Class 150, carbon`steel, screwed, Welded and/or flanged 3.2.1 Pipe: Carbon steel - 3/4" through 1-1/2" SCH 80, ASTM A 106 Grade A or B, or ASTM A 587 ~Tr~through 6" SCH 40, ASTM A 53 Grade A or B, Type E or S. 3.2.2 Screwed Construction - through 1-1/2" nom. pipe size Fittings: Screwed, 3000 lb - ANSI B16.ll; Forged carbon steel - see ASTM A 105. Thread Dope: PTFE tape or paste; litharge and glycerin (results in a threaded joint that cannot be taken apart) Unions: Screwed, 3000 lb - ANSI B16.ll, Forged carbon steel - ASTM A 105. Alternate through 1" size: Flange unions, screwed, 1500 lb two-bolt oval type, tongue and groove, forged carbon steel - ASTM A 105. Valves, Gas: Globe type, 800 lb, screwed, forged steel (see 53.4) Ball type, 300 lb, screwed, cast steel (see 3.5) Plug type, 300 lb, screwed, ductile iron (see 53.6) I i I 4 I1 i- j *i ST0447476 3.2.3 Socket Welded Construction - through 1-1/2" nom. pipe size Fittings: Socket weld, 3000 lb, Forged steel, ASTM A 105. Flanges: Socket weld, Class 150, Forged steel, ASTM A 105 or 1500 lb, two or four-bolt oval type Gaskets: See welded or flanged construction 3.2.4 Welded and/or Flanged Construction - through 6" nom. pipe size Butt Weld Fittings: Carbon steel, same schedule as pipe, ASTM A 234 Grade WPB. Flanges: Class 150-ANSI 16.5, 1/16" raised face, forged carbon steel - ASTM A 105, slip-on type suggested for pipe and weld neck for fittings. Gaskets: High temperature compressed asbestos, ring type, per Federal Spec HH-P 46E Thickness - 1/16" for pipe sizes to 1-1/2" Nom. 1/8" for pipe sizes 2" and larger For tongue and groove flanges: Chemical lead, 2 - 4* antimony, 1/8" thick or asbestos specification per HH-P 46E. Gasket Dope: None permitted. Bolts and Nuts: Heavy hex, carbon steel per ASTM A 307 Gr B. Dimensions - Bolts-ANSI BIB.2.1; Nuts B18.2.2 Threads per ANSI B 1.1 - Bolts - Class 2A Fit; Nuts - Class 2B Fit. Valves: Globe type, Class 150, flanged, cast steel (see S3.4) Ball type. Class 150, flanged, ductile iron or cast steel (see S3.5) Plug type. Class 150, flanged, ductile Iron (see 53.6) 3.3 SERVICE: Chlorine gas or liquid, -20F to 300F, vacuum to 300 PSI SYSTEM: Class 300, carbon steel, screwed, welded and/or flanged 3.3.1 Pipe: Carbon Steel 3/4" through 1-1/2" SCH 80, ASTM A 106 Grade A or B. 2" through 6" SCH 80, ASTM A 53 Grade A or B, type S. 3.3.2 Screwed Construction - through 1-1/2" nom. pipe size Fittings: Screwed, 3000 lb - ANSI B16.ll; Forged carbon steel ASTM A 105. Thread Dope: PTFE tape or paste; litharge and glycerin (results in a threaded joint that cannot be taken apart) Unions: Screwed, 3000 lb - ANSI B16.ll, Forged carbon steel ASTM A 105. Alternate through 1" size: flange unions, screwed, 1500 lb two-bolt oval type, ' tongue and groove, forged carbon steel ASTM A 105. Valves, Liquid or Gas: Globe type, 800 lb, screwed, forged steel (see 53.4) Ball type, 300 lb, screwed, cast steel (see 53.5) Plug type, 300 lb, screwed, ductile iron (see 53.6) 3.3.3 Socket Welded Construction - through 1-1/2" nom. pipe size Fittings: Socket weld, 3000 lb, forged steel, ASTM A 105. Flanges: Socket weld. Class 300, forged steel, ASTM A 105 or 1500 lb two or four-bolt oval type Gaskets: See welded or flanged construction. 3.3.4 Welded and/or Flanged Construction - through 6" nom. pipe size Butt Weld Fittings: carbon steel, same schedule as pipe, ASTM A 234 Grade WPB. _ _ - _ Flanges: Class 300 ANSI B16.5, 1/16" raised face, forged carbon steel - ASTM A 105, slip-on type suggested for pipe and weld neck for fittings. Gaskets: High temperature compressed asbestos, ring type, per Federal Spec HH-P 46E Thickness - 1/16" for pipe sizes to 1-1/2" Nom. 1/8" for pipe sizes 2" and larger For tongue and groove flanges: Chemical lead, 2-4* antimony, 1/8" thick or asbestos specification per HH-P 46E. Gasket Dope: None permitted Bolts and Nuts: Heavy hex, carbon steel per ASTM A 307 Gr. B. Dimensions - Bolts-ANSI B18.21; Nuts 818.2.2 Threads per ANSI B 1.1 - Bolts - Class 2A Fit; Nuts - Class 2B Fit. Valves, Liquid or Gas:. Globe type, Class 300, Flanged, Cast Steel (see 53.4) Ball type. Class 300, Flanged, Cast Steel (see 53.5) ' Plug type. Class 300, Flanged, Cast Steel (see 53.6) 3.4 GLOBE VALVES - (See 53.1 through 3.3 for recommendations based onservice conditions) - To be cleaned for chlorine service by the manufacturer. 3.4.1 Screwed, 800 lb Body - Forged steel per ASTM A 105 Bonnet - Flanged, OS&Y Stem - Hastelloy C Disc - Monel Seat - Monel ring Packing - PTFE impregnated asbestos i ( ; , JO | t I J f I ST0447477 e m n 'iQ is CO r' 1-- -3- -ao *? 4- r U./' L 3.4.2 Flanqed, Class 150 or Class 300 Body - Cast steel per ASTM A 216, Grade WCB Bonnet - Flanged, OSSY Stem - Hastelloy C Disc - Monel, plug type Seat - Monel ring Packing - PTFE impregnated asbestos 3.5 BALL VALVES -(See 3.1 through 3.3 for recommendations based on service conditions) - To be cleaned for chlorine service by the manufacturer. Valve design shall insure that excess pressure in the ball and body cavity of closed valve will relieve spontaneously toward the direction of high pressure. This relief may be accomplished by providing a relief hole in the ball or in the body, bypassing the upstream seat, or by the use of cavity pressure relieving seats. If relieving device is directional, the valve body must be supplied with indicator noting the direction of pressure tightness. Valve stem seals shall be externally adjustable to stop stem leakage. The stem shall be such as to prevent accidental removal while the valve is in service. The valve shall be provided with a port position indicator. Manufacturers shall test each valve for seat tightness. Each seat in every pressure relieving seat valve or the seat opposite the relief hole in a. one-way valve must be tested. There shall be no leakage in one minute at 80 PS1 at a temperature of 65F to 75F. Manufacturers shall test a representative sample of each size and model valve for seat relief. Pressure introduced into the valve cavity must relieve at pressure indicated below: Class 150 and 300, through 3" size - maximum of 5 times CWP rating Greater than Class 300 or over 3" size - maximum of 2.5 times CWP rating Relief is to be measured at a temperature of 65F to 75F with no pressure on either side of the valve and Is that pressure at which a steady stream of bubbles at a minimum rate of one per IS seconds Issues from the valve cavity. 3.5.1 Screwed, 150 lb or 300 lb Body - Cast steel per ASTM A 216 Grade WCB Ball and Stem - Monel or Hastelloy C Seat - reinforced PTFE Seals - PTFE 3.5.2 Flanqed, Class 150 Body - Cast ductile iron per ASTM A 395 or cast steel per ASTM A 216 Grade WCB Ball and Stem - Monel or Hastelloy C Seat - reinforced PTFE Seals - PTFE 3.5.3 Flanqed, Class 300 Body - Cast steel per ASTM A 216 Grade WCB Ball and Stem - Monel or Hastelloy C - - *- -Seat - reinforced PTFE Seals - PTFE 3.6 PLUG VALVE5 -(See 3.1 throuqh 3.3 for recommendations based on service conditions) - To be cleaned for chlorine service by the manufacturer. Valve design shall insure that excess pressure in the plug and body cavity of closed valve will relieve spontaneously toward the direction of high pressure. Valve stem seats shall be externally adjustable to stop stem leakage. The stem shall be such as to prevent accidental removal while the valve is in service. 3.6.1 Screwed, 300 lb Body - Cast ductile iron per ASTM A 395 or Cast steel per ASTM A 216, Grade WCB Sleeve - PTFE Plug and Stem - Monel Seals - PTFE 3.6.2 Flanqed, Class 150 Body - Cast ductile iron per ASTM A 395 or Cast steel per ASTM A 216, Grade WCB Sleeve - PTFE Plug and Stem - Monel Seals - PTFE 3.7 NON-FERROUS METAL CONSTRUCTION At ordinary temperatures, chlorine reacts vigorously with many cormion materials such as aluminum, titanium and tin (see Chlorine Manual). Where flexible connections are required ST0447478 between cylinders or ton containers Snd rigid piping systems, copper and copper alloy construction may be used. Because of the reaction between chlorine and tin, brazing alloys containing tin should not be used. For additional protection against external corrosion, cadmium plating is r-ecommended. 3.7.1 Copper Tubing Seamless copper water tube per ASTM B 88 in the annealed state with Type K wall thickness or heavier is recommended. 3.7.2 Fittings for Copper Tubing Wnere tubing terminates at standard chlorine cylinder or ton container valves, adapters snown on Institute Drawing 130, brazed to the tubing, are recommended. For other applications, flareless type fittings in monel or solder type fittings in wrought copper are recommended. Lead based solder must not be used. Gasketed type connections are preferred where connections are to be broken frequently. Flared type fittings are not recommended. For chlorine tank car unloading connectors, refer to Dwg. 118. For small union connection standards, refer to Dwg. 171. 3.8 PLASTIC CONSTRUCTION As with virtually all hydrocarbon based materials, most plastics will react chemically with chlorine. This reaction can be dangerous, even explosive. Only a few highly halogenated plastics such as PTFE, polyvinylidene fluoride (Kynar )*, and ethylene chlorotrifluoroethylene (Halar )* possess adequate chemical properties to be useful in chlorine service. For some limited purposes polyvinyl chloride, chlorinated polyvinyl chloride, acrylonitrile butadiene styrene, polyethylene, and polypropylene are used. See 3.8.1 and 3.8.2. Plastics should be used only as specified by a designer experienced in the handling of chlorine or as recommended by the manufacturer of the chlorine handling equipment. 3.8.1 Pipe and Fittings Chlorine gas only, 30" Hg vacuum to 6 PSI pressure: For 130F max, schedule 40 PVC {polyvinyl chloride) with solvent cemented joints (schedule 80 with screwed joints) may be used. For 212F max, CPVC (chlorinated polyvinyl chloride) pipe or fiber glass reinforced pipe fabricated from a resin specifically recoumended by the producer of that resin as suitable for chlorine service may be used. 3.8.2 Tubing and Fittings For chlorine gas only, vacuum service, 130F max, polyethylene tubing, 1/16" wall thickness and up to 5/8" 00 with compression type fittings may be used. 3.9 SPECIAL PURPOSE VALVES 3.91 The valves, drawings of which are cited in this section, are designed for chlorine transporta tion containers and have been approved for such service. They are frequently used In chlorine piping systems. Ton Container 4 Cylinder Valve Design and Material - See Dwgs 110, 112 and 113 3.9.2 Tank Car Angle Valve Design and Material - See Dwgs 104 and 105 3.9.3 Safety Relief Valves 3.9.3.1 For transportation equipment Design and Material - See Dwgs H-51970-A and H-50155-B 3.9.3.2 Standard construction To be used in combination with a breaking pin assembly or rupture disc. Construction - Angle body, closed bonnet, screwed cap over adjusting screw *Note: These are registered trademarks of Pennwalt Corp. and Allied Chemical, respectively. `<h f 0 T a\ ST0UU7U79 I i ` 1 ST0447479 08*1 i. *1*1015 A - DESIGN. CONSTRUCT ION AND TESTING Oiorine (tank car)(cargo tank) (tank barge) transfer hose to the following specificat ions: App)ication Data; Length Inside Oometer nd Connect ions 2. Qeslgn and Construction: 2.1 Design Pressure. Hose shell be designed for a bursting pressure of not less than five times the maximum safety relief valve setting of the tank with which it <s used. Minimum design pressure shall be 375 psig for tank car or cargo tank service and 300 psig for barge service. 2.2 Hose. The hose shall be corrugated from a seamless or butt welded tube. It shall have annular or helical corrugations and shall be of one con* tlnuous length. 2.3 Braid. The braid shall be of diamond lay or basket weave and shall be permanent)y attached at both ends by welding. 2.4 End F11inos. Both ends of assembly shall terminate with Schedule 80 pipe nipples which shall be permanently attached to assembly by welding or brazing. Flanges may be welded, brazed or threaded to nipples. Van Stone lap joints may also be used. 2.5 Wrench Pads. Hex wrench pads made from steel or malleable Iron shall be pertinently attached to pipe nipples by welding. 2.6 Physical Protection. Hose assembly shall be provided with one of the following; 2.6. I Spiral Guard. The hose shall be provided with a stainless steel spiral guard for the full length of hose. Spiral guard shall be permanetly attached to ferrules by welding. Spiral guard shall be l/4"x 3/32" Type 304 stainless steel flat wire or strip helically v^und around the l braided hose. Maximum spacing between each spiral shall be 3/4", 2.6.2 Stainless Steel Casing. The hose shall be provided with a loosely **>und Type 302 stainless steel Interlocked casing for the full length of hose. i Casing shall be permanently attached to the ferrules by welding. 2.7 A1lovs, Hose, braid and pipe nipples and ferrules shall be Monel 400. 2.B 2.8. 1 2.8.2 Welding. Welding or brazing shall be in accordance with either paragraph 2,8.1 or 2.8.2 below and shall be performed by welders or brazors qualified per Section IX of the A.S.M.E. Boiler and Pressure Vessel code. Welding shall be done by the tungstan-inert gas shielded arc method using Honel 60 filler wire for the hose, braid and fitting welds and INC0 62 or INC0 92 filler wire to weld wrench pads to pipe nipples and spiral guard or stainless steel casing to ferrules. All joints shall be nicro-brazed per A.M.S. 4779 using nickel welding rod. Internal plastic coatings or liners ere not recommended. - - --2.10 -External coatings of neoprene or other elastomers are not reconmndad since these hide evidence of smell leaks. 3. Testinq. 3-' Prototype Test . A prototype hose assembly of three feet minimjm length representative of all lengths of that diameter 6 fitting construction shall withstand a hydrostatic test pressure of at least five times the design pressure without bursting or otherwise breaking at any seam or joint. The hose temperature during this prototype test shall duplicate the marked minimum service temperature. Any assembly so tested shall not be subsequently used in transfer service and shall be scrapped. If any detail of design or fabrication technique is changed, a new prototype shalI be so tested. 3.2 Production Pressure Test. Each hose assembly shall be hydrostatically tested at ambient temperature to a pressure not less than twice Its maximum working pressure nor more than tv^-flfthj Its bursting pressure. 3-3 Gas Pressure Test. Hose assembly shall withstand a Gas Pressure Test with helium or nitrogen under water at twice the minimum design pressure. k*h msji 4. 5. 5.1 15.2 B JJ T 1 I. 1 1.2 l3 I4 2. .2. I 2.2 ST0447480 il 8*iLhnois 5. 5. 1 u Harking; A nameplate or equivalent showing the following shall be permanently attached to each hose. Manufacturer _________________ Maximum Working Pressure Hydrostatic Test Pressure Minimum Service Temperature ________________ Compiles with Chlorine Institute Dwg. 135-2 Preparation for Delivery; pslg ps ig F Cleaning. After all Inspection and testing, assembly shall be cleaned sotficient1y to remove hydorcarbons and other contaminants which may re act with chlorine. Assembly shall be thoroughly dried after cleaning by drying In oven at approximately 300*F or by purging with dry, oil-free air or nitrogen having e dew point of minus 40#F or lower. End Seals. Both ends of assembly shall be suitably capped with plastic or elastomeric caps to prevent entry of contaminants during shipment. B " INSTALLATION AHD MAINTENANCE The following paragraphs do NOT form part of recommended purchase specifloat Ion. I Installetlon: l.l A chlorine type ball valve is recommended for the container end of the hose. This valve protects the hose from Internal contamination by moisture In the air when the hose is disconnected from the chlorine container. Protection by plugging or capping Is an acceptable alternatIve. 12 The fixed end of the hose should be attached to vertical piping so the hose will hang vertically when not in use. As an alternate, a boom may be used to provide support for the weight the hoses when they are not In use. 1.3 Use two wrenches to make up threaded fittings to avoid torqueing. Place holding wrench on pipe fittings only, never on braided section. Hake up fixed flanges first on assemblies containing fixed and floating flanges. I 4 A hose should be In one plane only. Compound bends which induce torque, l.e. - twisting, should be avoided. Recommended centerline bend radii or offsets should not be exceeded Use two or more men on long or heavy assemblies to prevent hose distortion. 2. Maintenance: ,I f Hose Is a non-reparable Item and should be replaced If following conditions are noted:** e. Leakage, b. )c. d. Frayed or worn braid. Ballooned or bunched braid, Hose -e looget Ion. or deformation e. Corrosion. 2,2 When hoses are retested, hose should be properly supported. Rated test pressures should not be exceeded. USC6 Regulation 151.04-5(h) requires that"Cargo hose stored on board the vessel ----- shall be Inspected every 2 years . The Inspection shall consist of a visual examination and a hydrostatic test of 1-1/2 times the maximum pressure to tdileh the hose may be subjected. The date of the most recent In spection and the test pressure shall be stenciled or otherwise marked on the hose". Thie drawing was developed by a technical cormittce of the Institute. The user should be aware that changing technology or regulations mght recpuir* revision of the droving. Appropriate steps should be taken to insure that the droving is current when used. 3 Z 1^73 Rev U.H, z.g 3. / 0*0 2,//2.8.x7.3.J 1SS. dAte REVISION cess rss APPR. THE CHLORINE INSTITUTE. INC. NEW YORK, N. Y. RECOMMENDED SPECIFICATIONS FOR CHLORINE TRANSFER HOSE DRAWN TRACED CHECKED DWG. NO. L. 13 &rkWcY ISSUE 3 ST0447481 Connections - Inlet flange - Class 300 - Outlet flange - Class 150 or 300 Materials - Body - cast carbon steel - Nozzle, Disc Adjusting ring. Nozzle ring, Spindle Guide - Hastelloy "C" or Monel - Spring - steel, nickel plated 3.9.3.3 "0" Ring Seat Seal Construction Safety relief valves complying with 3.9.3.2 but equipped with "0" ring seat seals of Viton may be used without a breaking pin or rupture disc. 3.9.3.a Safety relief valves of other designs are acceptable provided that the materials used are compatible with chlorine and that their design and installation meet the general requirements of tne ASME Boiler and Pressure Vessel Code Division 1, Section VIII. 3.9.4 Excess Flow Valves Size & Design 1-1/4" - Per Dwg. 101 (Max. operating liquid flow rate 7,000 lbs/hr) 1-1/4" - Per Owg. 106 (Used in chlorine gas only) 1-1/4" - Per Owg. 114 (Max. operating liquid flow rate 15,000 lbs/hr) 2" x 2-1/2" Per Dwg. 162 (Max. operating liquid flow rate 30,000 Ibs/hr) 1-1/4" - Per Dwg. 163 (Max. operating liquid flow rate 11 pOOO lbs/hr) ST0UU1U82 Material See drawings 3.9.5 Check Valves Spring loaded or gravity operated check valves are not recoirmended for chlorine service. Power operated control valves with suitable instrumentation should be used. 3.10 RUPTUP- DISCS Connections Up to 1-1/2" - screwed, socket weld or flanged 2" and up - flanged or butt weld ( Flange Rating To conform to the design class of the piping system. (See S3.1 - 53.3) Materials Flanges - forged carbon steel Oise - silver, tantalum, impervious graphite i, Design Considerable margin between operating pressures and rated burst pressure of disc should be provided. Operating pressures exceeding 70S of disc pressure c.. may cause premature failures. Vacuum supports should be used where necessary Note: Impervious graphite discs should not be used in conjunction with safety relief valves. 3.11 INSTRUMENTS 3.11.1 When pressure measuring systems are isolated from chlorine by a liquid filled system, the recommended filling fluid is a polymer of trlfluorovinylchloride of appropriate viscosity {e.g. Fluorolube )* 3.11.2' Pressure Gaqes & Pressure Switches 3.11.2.1 Diaphragm sealed type - Line Connections Materials Screwed or flanged Seal, upper body - steel Seal, lower body - steel or monel Diaphragm - Monel, silver or tantalum Pressure Range Twice operating pressure 3.11.2.2 D1 rect Reading Tvd< Line Connections Screwed or flanged Materials Pressure Range Bourdon tube - Monel Twice operating pressure Note: This Is a registered trademark of Hooker Chemicals & Plastics Corp. ST0447482 eem. 1*1(us- 4. =* PIPING LAYOUT 4.1 GENERAL Piping arrangements should be as simple as possible with a minimum number of joints. Piping systems should be well supported and adequately sloped. Low spots should have openings for drainage. Suitable allowance should be provided for pipe expansion due to changes in temper ature. Shut-off valves at the end of a line, or valves at intermediate points in a long line, provide a means of Isolating serious leaks. See also 14.2. 4.2 LIQUID EXPANSION PROTECTION Liquid chlorine has a very high coefficient of thermal expansion. If liquid chlorine is trapped between two closed valves and then warms up in the sun or because of other conditions, very high pressures can develop. These pressures may be sufficient to cause rupture of some portion of the system and the release of the trapped chlorine. Such rupture can be prevented by a suitably designed and installed expansion chamber. In deciding whether an expansion chamber is desirable, one should give consideration to the quantity of chlorine involved, the nature of possible personnel exposure if rupture occurs, and to damage to equipment. Two suitable designs for expansion chambers are shown on Drawing No. 136. Both incorporate a rupture disc and receiver chamber together with a pressure indicator or alarm switch set to function if rupture occurs. Rupture discs should be temporarily removed when hydrostatic testing. Alternate A incorporates an expansion chamber ahead of the rupture disc. This device should be installed at the high point in the line so that noncondensible gases can collect in the chamber and provide a cushion for some expansion before rupture occurs. The valve between the primary chamber and the rupture disc permits changing the rupture disc while the product line is in service but this valve must always be left in the open position. Expansion chambers should be constructed in accordance with Section VIII of the ASME Code for Unfired Pressure Vessels. (Small vessels are exempted from certain Code requirements) 4.3 CONDENSATION Condensation or reliquefaction of chlorine may occur in chlorine gas lines which pass through areas where the temperature is below the temperature pressure equilibrium Indicated in the vapor pressure curve. Where adequate superheat is not provided by a vaporizer or by reducing the pressure with a pressure reducing valve, the line should be traced and insulated. Surface temperature of the chlorine pipe should not be allowed to exceed 250F. 5. PREPARATION FOR USE 5.1 CLEANING All portions of chlorine systems must be cleaned before use because chlorine can react violently with cutting oil, grease, and other foreign materials. Carbon tetrachloride is recommended as a cleaning solvent. CAUTION: Excess exposure to carbon tetrachloride and most other chlorinated solvents presents a toxic risk. Caution must be exercised using the - most effective combination of engineering controls, work practices and personal protection that will provide minimum exposure. Cleaning must not be done with hydrocarbons or alcohols because residual solvent may react with chlorine. Any equipment received In an oily condition should be dismantled and cleaned before use. 5.2 HYDROSTATIC TESTING Chlorine piping should be hydrostatically tested to 1.5 times the maximum pressure to which the system may be subjected. Pressure gages, relief valves and other components which may be damaged should be removed and openings blocked off prior to testing. It is essential that chlorine systems be thoroughly dried (see 5.3) prior to being put into service. f' There are some circumstances under which such drying cannot be accomplished after hydrostatic testing with water. If such drying is impractical and if the equipment and components comply in all other respects with the provisions of Institute Pamphlet No. 6, hydrostatic testing may Be omitted and the equipment thoroughly cleaned, tested and prepared for service as in applicable parts of 5.3 and 5.4. 5.3 PRYING During construction, moisture may enter the system from the atmosphere or other sources. For this reason, pipe lines must always be dried before use. This can be done by passing steam through the lines from the high end until the lines are thoroughly heated. While steaming allow condensate and foreign matter to drain out. The steam supply then should be disconnected and all the pockets and low spots in the line drained. While the line is still warm dry air, having a oew point of -40F or below, should be blown through the line until it is dry. This may requiran extended period of time. _ ST0447483 If steam and dry air are not available, special care must be taken in cleaning sections of pipe and other equipment before assembly, and careful inspection is necessary as construction proceeds. The *'inal system should be purged with dry cylinder air or nitrogen. 5.4 GAS TESTING After drying, the system should be pressurized to 150 PSI with dry air or nitrogen and tested for leaks by application of soapy water to the outside of joints. Chlorine gas gradually may then be introduced and the system tested for leaks as described below. Never attempt to repair leaks by welding until all chlorine has been purged from the system. When detectable leaks have been repaired, the line should-be retested at the service pressure. 5.5 FINDING LEAKS The location of a leak in a chlorine containing system can usually be detected by the reaction of airmonia vapor with the escaping chlorine. The reaction is a dense white cloud. The most convenient way to use ammonia for this purpose is to direct the vapor from a plastic squeeze bottle containing aqua ammonia at the suspected leak. Do not squirt liquid aqua ammonia on pipe and fittings. Any efforts to detect the source of a leak should be carried out with full consideration for potential hazards. Appropriate protective equipment must be used. tST0UI*1I*8U 6.1 ANSI STANDARDS ANSI 81.1 - 1974 ANSI 82.1 - 1968 ANSI B16.5 - 1977 ANSI B16.ll - 1973 ANSI B16.34 - 1973 ANSI B18.2.1 - 1972 ANSI B18.2.2 - 1972 ANSI 831.3 - 1976 cr o ANSI B57.1 - 1977 ANSI W3.1 - 1973 ANSI W3.2 - 1973 6.2 A5TM -SPECIFICATIONS A 53 A 105 A 106 A 181 A 182 A 194 A 197 A 216 A 234 A 307 6. REFERENCES Unified Inch Screw Threads Pipe Threads (Except Dryseal) Steel Pipe Flanges and Flanged Fittings Forged Steel Fittings, Socket Welding & Threaded Steel Butt-Welding End Fittings Square and Hex Bolts and Screws Square and Hex Nuts Chemical Plant and Petroleum Refinery Piping Compressed Gas Cylinder Valve Outlet 4 Inlet Connections Mild Steel Covered Arc-Welding Electrodes Iron and Steel Gas Welding Rods Welded and Seamless Steel Pipe Forgings, Carbon Steel, for Piping Components Seamless Carbon Steel Pipe for High-Temperature Service Forged or Rolled Steel Pipe Flanges, Forged Fittings, and Valves and Parts for General Service Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service Carbon and Alloy Steel Nuts for Bolts for High Pressure and High-Temperature Service Cupola Malleable Iron Carbon Steel Castings Suitable for Fusion Welding for High-Pressure and High-Temperature Service Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and Elevated Temperatures Carbon Steel Externally and Internally Threaded Standard Fasteners ST0447484 A 320 Alloy Steel Bolting Materials for Low-Temperature Service Ferritic Steel - "L" Grades only A 322 Hot-Rolled Alloy Steel Bars A 333 Seamless and Welded Steel Pipe for Low-Temperature Service A 350 Forgings, Carbon and Low Alloy Steel, Requiring Notch Toughness Testing for Piping Components A 352 Ferritic Steel Castings for Pressure-Containing Parts Suitable for Low-Temperature Service A 354 Quenched and Tempered Alloy Steel Bolts, Studs and other Externally Threaded Fasteners A 395 Ferritic Ductile Iron Pressure Retaining Costings for Use at Elevated Temperatures A 587 Electric-Welded Low-Carbon Steel Pipe for the Chemical Industry B 88 Seamless Copper Water Tube 6.3 FEDERAL SPECIFICATIONS HH-P-46E - Compressed Asbestos Sheet Packing 6.4 OTHERS SAE Handbook Supplement 150 - 1971 Edition - Tube. Pipe, Hose and Lubrication Fittings 6.5 INSTITUTE 6.5.1 Pamphlets 1 - Chlorine Manual 5 - Facilities and Operating Procedures for Chlorine Storage 9 - Chlorine VaporizingEquipment 60 - Chlorine Pipelines 6.5.2 Drawings 101 - Excess Flow Valve with Removable Seat - 7,000 lbs per Hour 102 - Studs, Nuts and Gaskets for Chlorine Tank Manway Covers & Valves 104 - Standard Chlorine Angle Valve Assembly _ _ .105 - Standard Chlorine Angle Valve Parts 106 - Excess Flow Valve with Removable Basket 110 - Valve for Chlorine Cylinders and Ton Containers - Assembly 111 - 3/4" and 1" Fusible Plug for Chlorine Ton Containers 112 - Valve & Fusible Plug for Chlorine Cylinders & Ton Containers - Spec. & Gen. Notes 113 - Valve for Chlorine Cylinders and Ton Containers - Parts 114 - Excess Flow Valve with Removable Seat - 15,000 lbs per Hour 118 - Chlorine Tank Car Unloading Connections (attached) 135 - Recommended Specifications for Chlorine Transfer Hose (attached) 136 - Chlorine Expansion Chambers (attached) 162 - Excess Flow Valve with Removable Seat - 30,000 lbs per Hour 163 - Excess Flow Valve with Removable Seat - 11,000 lbs per Hour 171 - Small Union Connection ' i.t *i -4 ST0447485 ? ST0UU7486 This m igh d t ra re s q ixg u ire wo# rev diseivoenlopoefd iy the a te sh n io a l committee drawing. A ppropriate o f the I n s t it u t e . The user should be CTJCxe th a t steps should be taken to in s u re th a t the d ra u in g changing technolrgy o r is c u rre n t uhen used. re g u la tio n s ST0447486 1/1 -- a \ mil} zo Z---* --- XC3 Q It _/ OO lV/> V/) -y i/i i/i -CL -< o OO V) z-- *cc i; cc 3" X u 0 00 2: < Q. O0 X DC UJ UI CD u) > z < --1 DC 0 O _J IC O * r> sC s4 -Qure -%K*c S'I rqj.4 .a o :sl I L -aCw! 5S S5 uO 5- !m*. I ** 5.3 iz o a. U) n 9 "9 Q> < 11 4T ft a % ** "3 e ** U I* e* -c '? uUi O7 Zz > z $ Ui ST0447487