REVISIONS App PC. App Sud. App Thom 2011/10/26 GS 2012/10/01 BL 2011/10/26. Pending GS 2012/10/01 BL 2012/10/23. Pending MDF 2011/10/26 GS 2013/04/22

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1 1/14 Rev Description Document format and number changed. Previous number Approved for use in Thompson Piping system Approval Requirements for MB updated Specification Reference Correction Rev n by AR 2011/10/26 AR 2011/10/26 AD 2012/11/23 App Sud BL 2011/10/26 BL 2011/10/26 BL 2012/10/23 REVISIONS App PC App Thom App VB App LH App Clyd App Act Issue Date YYYY/MM/DD Pending Pending Pending Pending Pending Pending 2012/04/26 Pending Pending GS 2012/10/01 GS 2012/10/01 Pending Pending Pending Pending 2012/10/02 Pending Pending Pending Pending 2012/11/23 4 Section 5 Testing Code Reference Changed MDF 2011/11/23 MDF 2011/10/26 Pending Pending Pending Pending Pending Pending 2013/02/22 5 Approved for Thompson MDF 2011/11/23 MDF 2011/10/26 Pending GS 2013/04/22 Pending Pending Pending Pending 2013/04/ Standards Review See Appendix A MDF 2015/04/01 MDF 2015/05/01 Pending Pending Pending Pending Pending Pending 2015/05/14 7 Pipe Couplings for U/G Changed MDF 2015/0/20 MDF 2015/0/20 Pending Pending Pending Pending Pending Pending 2015/0/20 Spec approved for MB N/A N/A N/A HM 29 SEP 16 N/A N/A N/A N/A 29 SEP 16 Sud = Sudbury, Ontario, PC = Port Colborne, Thom = Thompson,, VB = Voisey s Bay, LH = Long Harbour, Act = Acton, England, Clyd = Clydach, Wales, N/A = Not Applicable

2 2/ PURPOSE This specification describes the minimum requirements for service and plant air systems operating up to 125 psig. 2.0 APPLICATION Engineering design and specifications only approved for use with Vale Canada Limited, Thompson or its successor or assignee. Any use a third party makes of this document or drawing, or any reliance on or decisions to be made based on it, beyond its use for Vale Canada Limited purposes are the responsibility of such third parties. Vale Canada Limited accepts no responsibility for damages, if any, suffered by any third party as a result of decisions made or actions based on this document or drawing beyond those specified herein. This specification, applies at any Vale locations indicated with approval on the cover page, with the following exceptions: 2.1 EXCEPTIONS None. 3.0 REFERENCE DOCUMENTATION The following documents were used in the development of this document or have instructions and procedures applicable to it. They shall be used in their most recent revision. TH-SPEC Identification and Classification TH-SPEC Piping General Requirements TH-SPEC Welding Process Requirements TH-SPEC-3504 Requirements for Pneumatic Testing of Piping Systems TH-PROC-3006 Hydrostatic Testing TH-SPEC Buried Pipelines Water CSA B51 Boiler, Pressure Vessel and Pressure Piping Code CSA Z10.1 Compressed Breathing Air and Systems ASME B31.1 Power Piping ASTM A53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc- Coated, Welded and Seamless ASTM A234 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service ASTM A105 Standard Specification for Carbon Steel Forgings for Piping

3 3/14 ASTM A106 ASTM B61 ASTM B62 ASTM F61 ASTM A139 ASTM F1476 ASTM A-13 ASTM A-449 ASTM A536 ASTM A563 ASTM D2000 ASTM A307 ASTM A563 ASTM A179 ASME F37 ASTM A193 ASTM A194 ASME B16.3 ASME B16.5 ASME B16.1 ASME B36.10 ASME B16.11 ASME B16.9 ASME B16.34 ASME B16.21 ASME B1.2.1 ASME B1.2.2 ASME B1.1 ASME B16.39 ASME B ASME B16.25 Applications Standard Specification for Seamless Carbon Steel Pipe for High Temperature Service Standard Specification for Steam or Valve Bronze Castings Standard Specification for Composition Bronze or Ounce Metal Castings Standard Practice for use of Branch Connections Standard Specification for Arc Welded Steel Pipe Standard Specification for Performance of Gasketed Mechanical Couplings for Use in Piping Applications Carbon Steel Track Bolts and Nuts Quenched and Tempered Steel Bolts and Studs Standard Specification for Ductile Iron Castings Standard Specification for Carbon Steel Track Bolts and Nuts Standard Classification System for Rubber Products in Automotive Applications Specification for Carbon Steel Bolts and Studs, 60,000 PSI Tensile Strength Specification for Carbon and Alloy Steel Nuts Standard Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes Standard Test Methods for Sealability of Gasket Materials Standard Specification for Alloy Steel and Stainless Steel Bolting for High Temperature Service or High Pressure Service Standard Specification for Carbon Steel and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service or Both Malleable Iron Threaded Fittings Pipe Flanges and Flanged Fittings Gray Iron Pipe Flanges and flange Fittings Welded and Seamless Wrought Steel Pipe Forged fittings Socket Welded and Threaded Factory-Made Wrought Buttwelding Fittings Valves Flanged, Threaded and Welding Ends Nonmetallic Flat Gaskets for Pipe Flanges Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series) Nuts for General Applications: Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch Series) Unified Inch Screw Threads Malleable Iron Threaded Pipe Unions Pipe Threads, General Purpose (Inch) Butt Welding Ends

4 4/14 ASME B1.2.1 ASME B1.2.2 MSS SP-44 MSS SP-67 MSS SP-97 MSS SP-3 SSPC-SP-5 Square, Hex, Heavy Hex and Askew Head Bolts Nuts for General Applications: Machine Screw Nuts, Hex, Square, Hex Flange and Coupling Nuts (Inch Series) Steel Pipeline Flanges Butterfly Valves Integrally Reinforced Forged Branch Outlet Fittings Class 3000 Steel Pipe Unions, Socket Welding and Threaded White Metal Blast Cleaning 4.0 AND FITTINGS Design Conditions Operating Conditions F Lowest rated component in system 125 temperature up to 140 F Design Fabrication Installation In accordance with this specification and SPEC Piping General Requirements CSA B51 Boiler, Pressure Vessel and Pressure Piping Code ASME B31.1 Power Piping Approvals ONTARIO: Service Air Piping systems subject to the approval of TSSA, Boilers and Pressure Vessels Safety Division. MANITOBA: Piping systems are subject to the approval of the Office of Fire Commissioner, Inspection and Technical Services Section, Steam and Pressure Plants Act. NEWFOUNDLAND: Piping systems are subject to the approval of the Newfoundland & Labrador, Department of Government Services, Public Safety Act, Boiler, Pressure Vessel and Compressed Gas Regulations. Note: compressed air piping, up to and including ¾ NPS is exempt from registration and approval.

5 5/14 Pipe ¾ through 1 ½ Schedule 0 per ASME B36.10, carbon steel ASTM A53 Gr. B or ASTM A106 Gr. B, ERW or seamless, grooved or plain ends. 2 through 10 Schedule 40 per ASME B36.10, carbon steel ASTM A53 Gr. B or ASTM A106 Gr. B, ERW or seamless, grooved or plain ends. 12 through thick wall per ASME B36.10, carbon steel ASTM A53 Gr. B or A106 Gr B, ERW or seamless, grooved or plain ends. Fittings 3/4" through 12" - Ductile iron conforming to ASTM A536 Grade with grooved ends. Victaulic #10, #11, #12, #13 elbows, #20 Tees, #35 Crosses and #50, 51 Reducers, or Gruvlok 7050, 7051, 7052, 7053 elbows, 7060 Tees, 706 crosses and Fig reducer. 14" through 16" " thick wall carbon steel to ASTM A234 Gr WPB with grooved ends. Note: 1) Elbows - Long Radius 1.5 D or 3 D, as indicated on project drawings. Victaulic #100 and #110, or Gruvlok 7050 LR and 7051 LR long radius elbows Branch Connections See Table 1 Attach to run pipe by full penetration welds. Threaded and socket weld half couplings, Class 3000 per ASME B16.11, forged carbon steel ASTM A105

6 6/14 Thredolet and sockolet, Class 3000 per ASME B16.11 and MSS SP-97, forged carbon steel ASTM A105 Weldolet, Extra strong per ASME B16.11 and MSS SP-97, forged carbon steel ASTM A105 - OR - Use ductile iron reducing tees with grooved ends or ductile iron tees with reducer fittings. Victaulic #25 or #29, or Gruvlok Fig reducing tees. Flanges 3/4" through 1 1/2" threaded type, raised face, Class 150 per ASME B16.5, forged carbon steel ASTM A105. Use flanges 3/4" thru 1 1/2" only for connections to flanged equipment. 2" through 16" Class 150, grooved pipe adapter flanges of ductile iron conforming to ASTM A536 Grade with flange manufacturer standard carbon steel fasteners and pressure responsive ASTM D2000 synthetic rubber (Buna N Nitrile) gasket. Victaulic Style 741 or Gruvlok Fig Victaulic Grade T or Gruvlok Grade T. -OR- 2 through 16 slip on or welding neck, raised face, Class 150 per ASME B16.5, forged carbon steel ASTM A105. Bore to match pipe ID. Note: Flat faced flanges required at flat faced cast iron valves Pipe Joints Couplings 3/4" through 16" - Grooved mechanical type, cast segments of ductile iron conforming to ASTM A536 Grade with coupling manufacturer standard carbon steel fasteners and pressure responsive ASTM D2000 synthetic rubber (Buna N

7 7/14 Nitrile) gasket. Victaulic Grade T or Gruvlok Grade T. Surface: Victaulic Style 77 or Gruvlok Fig flexible couplings. Victaulic Style 07 or Gruvlok fig rigid coupling. Underground: Victaulic Style 77 or Gruvlok Fig. 7001flexible couplings for mine development areas. Threaded Joints Do not use wet sealants. Use teflon tape. Flanged Joints Gaskets: 1/16" flat ring type for raised face inside bolts, nonasbestos, synthetic fibre, nitrile bonding. Dimensions per ASME B Full face gaskets required at flat face flanges. Gasket dope is not permitted. Manufacturer's gasket material recommendation subject to Vale approval. Flange Bolting: Carbon steel bolts to ASTM A307 Grade B, UNC threads with heavy hex nuts to ASTM A563 Grade A. Use Class 2A fit on bolts and 2B fit on nuts. Dimensions per ASME B1.1, B1.2.1 and B Welded Joints Essential variables to be in accordance with SPEC for the welding procedure (WP) identified. All sizes WP1 Ball Valves 1 " & Below psig minimum rating, brass body and ball, stainless steel or brass stem, teflon seats, reinforced teflon seals, lockable lever handle screwed to ASME B Valves to be lockable 1 1/2 through psig minimum rating, ductile iron two piece body ball valve, chrome plated or stainless steel ball, Teflon seats and seals, lockable lever handle, integrally grooved ends. Victaulic Series 726 or Gruvlok Series 7500 ball valves. Valves to be lockable

8 /14 Butterfly Valves 2" through 6" 150 psig rated ductile iron body wafer style for mounting between Class 150 ASME flanges, 316 stainless steel shaft and disc, Buna N seat, lever operated, rated 200 PSIG minimum differential in closed position, face to face dimensions in accordance with MSS SP-67. Valves to be lockable -OR- 1 1/2" through 6" - Two piece body, integrally grooved for use in conjunction with grooved pipe systems, ductile iron body, Buna N seat, aluminum bronze or 316 stainless steel disc and shaft, lever operated, rated 200 PSIG minimum differential in closed position. Victaulic Series 700 or Gruvlok Series 7600 butterfly valves. Valves to be lockable " & Above 150 psig rated ductile iron body wafer style for mounting between Class 150 ASME flanges, 316 stainless steel shaft and aluminum bronze disc, Buna N seat, gear operated, rated 150 PSIG minimum differential in closed position, face to face dimensions in accordance with MSS SP-67. Valves to be lockable - OR - " through 12" Ductile iron body butterfly valve integrally grooved for use in conjunction with grooved pipe systems, Buna N seat, nickel plated or aluminum bronze disc, 316 stainless steel shaft, gear operated, rated 300 PSIG minimum differential in closed position. Victaulic VIC-300 or Gruvlok Fig butterfly valves. Valves to be lockable Note: 1) Use lug style butterfly valves with through tapped holes to be used in dead end service or where line blinds are required for maintenance purposes.

9 9/14 Check Valves 2" & Below Class 125 bronze swing check ASTM B62 or B61, integral seat, bronze disc, screwed or union cap, threaded to ASME B /2" & Above - Ductile iron body non-slam check valve, aluminum bronze or ductile iron disc, Buna N seat, stainless steel or Inconel X spring. Minimum pressure rating 200 psig. Victaulic Series 716 or Gruvlok Series 700 check valves. - OR - 2 1/2 & Above Class 125/150 ductile iron body wafer style non-slam check valve, bronze disc, Buna N seat, stainless steel or Inconel X spring. Safety Relief Valves Selection by the Engineer. Pressure Reducing Valves Selection by the Engineer. Drain Traps 150 psig rated ball float type liquid drain trap, cast iron body and cap. - OR - Automatic drain valve 150 psi rated, 110 volts, 60 cycle, single phase. Strainers 1 1/2" & Below Class 250 iron body Y-Type strainer, screwed cap complete with blow-off connection and plug, 1/32" perforated stainless steel screen, threaded ends to ASME B

10 10/14 2 through 300 psig minimum rating ductile iron Y-type strainer, bolted or coupling cover, complete with blow-off connection and plug, 1/16 to 1/ perforated stainless steel screen, integrally grooved ends. Victaulic Style 732 or Gruvlok Model 75G strainers. - OR - 2" & Above Class 150 cast steel body Y-Type strainer, bolted cover complete with blow-off connection and plug, 3/64 or 1/ perforated stainless steel screen, flanged ends to ASME B16.1. Instrumentation Isolating Valves 1/2" Ball Valve 600 lb. Minimum rating, brass body and ball, stainless steel or brass stem, teflon seats, reinforced teflon seals, threaded to ASME B TESTING Testing must meet the requirements of ASME B31.1and TH-PROC-3006 (hydrostatic testing) or TH-SPEC-3504 (pneumatic testing - only at the discretion of the Engineer) and specific instructions in the scope of work. Test Pressure Duration Additional Requirements 225 PSIG Per Code none 6.0 EXAMINATION AND INSPECTION Examination and inspection must meet the requirements of ASME B31.1 and specific instructions in the scope of work. Minimum 100% visual examination for pressure welds or welds to pressure retaining components and a complete inspection. 7.0 PAINTING - PIPE SYSTEM CLASSIFICATION AND IDENTIFICATION The piping system shall be painted (classification) and labeled (identification) in accordance with TH-SPEC

11 11/14.0 TABLE 1 BRANCH CONNECTIONS Inches B R A N C H / / Inches /4 1/2 HEADER 1 = Equal Tee, D.I. grooved fitting 2 = Reducing Tee, D.I. grooved fitting 3 = Threaded Half Coupling 4 = Threadolet, Sockolet, Weldolet, as indicated on project drawings 5 = Straight or reducing tee with grooved reducer, D.I. grooved fittings 6 = Outlet coupling with integral reducing outlet, grooved or threaded outlet, Victaulic Style 72 coupling or equal 7 = Fabricated tee with grooved ends

12 12/ APPENDICES Appendix A: Revision and Transition Notes Appendix B: Keywords

13 13/14 Appendix A: Revision and Transition Notes (Revisions are listed in reverse chronological order with most recent revision at the top. Revision notes describe: what was changed, why it was changed, and the plan to implement the change, including whether changes are retroactive) Revision Approved for Revision 7 Results from an investigation regarding an over-torquing failure of a Victaulic Style 75 coupling, the OEM states these couplings should not be exposed to sudden shock or blasting as in an underground mining environment. OEM preferred coupling is the Style 77. The Victaulic Style 75 and Gruvlok Fig 7000 have been removed from this specification and replaced with Victaulic Style 77 or Gruvlok Fig Note: The above changes are applicable to any new installations and/or modifications to existing systems from this date forward. Revision 6 Section 3: Added some reference codes and/or standards that were omitted Section 4: Changed Pressure Rating to Design Conditions, added temperature range to design and operating conditions. Pressure rating is a component requirement while design pressure and temperature is a system requirement. Changed design conditions maximum temperature from 140 to 149 F to be consistent with other specifications and changed operating conditions from 33 to 140 F to temperature up to 140 F. Replaced paragraph with list of requirements in Design Fabrication Installation section for clarity. Added ASME B36.10 references to the Pipe Section. The lb. was removed from Class designations per ASME definition. ANSI was removed from ANSI/ASME designations as ANSI/ASME is incorrect. Added ASME B16.11 and MSS SP-97 reference to Branch Connection section. Gasket section title replaced with Pipe Joint title and now includes welding section, flange bolts section and gasket section. Replaced incorrect SPEC with SPEC in Welded Joint section. Add full face gaskets required at flat face flanges. Section 5: Added table, added SPEC-3504 and PROC-3006 reference. Removed duplicate content that is in the SPEC or PROC. Section 6: Added Inspection to title. Added inspection criteria per code. Clarified examination requirements. Section 7: Changed section title for clarity.

14 14/14 Note: The above changes are applicable to any new installations and/or modifications to existing systems from this date forward. Revision 5 Approved for Thompson. Revision 4 Section 5 Testing was corrected to reference B31.1 code compliance rather than B31.3 code compliance. Revision 3 Reference to SPEC-3003 corrected in Reference document section. No technical changes. Revision 2 Approved for use in Thompson. Piping system approval requirements updated for. Revision 1 Document format and number changed due to Vale Engineering Document Program changes in Previous Standard number Rev SPEC-3501 Appendix B: Keywords