This specification describes the minimum requirements for piping systems for the following service:

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1 201/11/2 1/9 1.0 APPLICATION This specification describes the minimum requirements for piping systems for the following service: Underground Service Water Note: This specification does not apply to piping for sprinkler systems or potable water. This specification does not apply to piping located in the mine shaft compartment Design Condition F Operating Conditions 225 ambient temperature Design, Fabrication, Installation, Approval Requirements ASME B31.1 CSA B51 SPEC SPEC SPEC System Approvals Power Piping Boiler, Pressure Vessel and Pressure Piping Code Piping Classification and Identification Identify and paint the piping system according to the requirements indicated on the project drawings or the scope of work. Do Not Paint stainless steel components. Piping General Requirements Leak Testing Requirements Water piping systems 250 psig or less are not subject to approval by regulatory agencies. 2.0 MATERIALS ½ to 1 ½ Schedule 80 per ASME B3.10, carbon steel ASTM A53 Gr.B, ERW or seamless, grooved or threaded ends. Pipe 2 to 10 Schedule 40 per ASME B3.10, carbon steel ASTM A53 Gr. B, ERW or seamless, grooved or beveled ends All pipe grooving shall be rolled grooved and in accordance with coupling manufacturer's procedures and specifications. Fittings ½ to 1 ½ Class 300 malleable iron fittings, WOG 1000 minimum non-shock rating, ASTM A197, threaded to ASME B1.3

2 201/11/2 2/9 Fittings (cont d) ¾ to 10 Ductile iron fittings conforming to ASTM A53, Grade with grooved ends. -OR- Schedule 40 carbon steel ASTM A234 WPB fittings, with welded grooved stub-ends. Confirm dimensions before ordering. Note: 1. Vendor supplied segmentally welded fittings to be fabricated from Sch 40 pipe with grooved ends. 2. Elbows - Long Radius R= 1 ½ x dia. unless otherwise noted. 3. Contractor supplied welded spool pieces to be fabricated from Sch 40 pipe and fittings. Attach to run pipe by full penetration welds. Threaded and socket weld half couplings, Class 3000 per ASME B1.11, forged carbon steel ASTM A105 Branch Connections Thredolet and sockolet, Class 3000 per ASME B1.11 and MSS SP-97, forged carbon steel ASTM A105 Weldolet, Extra strong per ASME B1.11 and MSS SP-97, forged carbon steel ASTM A105 For connection type, see Appendix A Branch Connections ¾ " to 1 1/2" Class 300 per ASME B1.5, raised face, slip-on, forged carbon steel ASTM A105. Use flanges 3/4" through 1 1/2", only for connections to flanged equipment. Flanges 2" to 10" Class 300 per ASME B1.5, raised face, slip-on or welding neck type, (bore to match pipe I.D.), forged carbon steel ASTM A105. or Class 300, grooved pipe adapter flanges of ductile iron conforming to ASTM A53 Grade with flange manufacturer standard carbon steel fasteners and pressure responsive ASTM D2000 synthetic rubber (Buna N

3 201/11/2 3/9 Nitrile) gasket Flanges (cont d) Pipe Joint Couplings Threaded Joint Sealant Flanged Joint Gaskets Flange Bolting Unions Gate Valves Globe Valves Victaulic Vic-Flange adapter, Style 743 Gruvlok Flange Style 7013 Note: Flat faced flanges are required at cast iron valves or flat face flanged connections, for all sizes. ¾ " through 24" Grooved mechanical type, cast segments of ductile iron conforming to ASTM A53 Grade with coupling manufacturer standard carbon steel fasteners and pressure responsive ASTM D2000 synthetic rubber (Buna N Nitrile) gasket. Couplings rated 800 psig minimum. Standard flexible coupling: Victaulic Style 77 Gruvlok Style 7001 Use Teflon Tape 1/1" flat ring type for raised face inside bolts, non-asbestos, synthetic fibre, nitrile bonding. Dimensions per ASME B1.21. Full face gaskets required at flat face flanges. Gasket dope is not permitted. Manufacturer's gasket material recommendation subject to Vale approval. Carbon steel piping. Alloy steel bolts ASTM A193 Gr. B7 UNC threads with heavy series hex nuts, ASTM A194 Gr. 2H, with Class 2A fit on bolts and Class 2B fit on nuts. Dimensions to ASME B and B ½ " & Smaller Class 300 malleable iron union, WOG 00 non-shock rating, ASME B1.39, copper to steel seats, ground joint, screwed ends to ASME B and larger Use Flanges Do not use unions for this system 1 ½ " & Below Class 300, bronze body, wedge disc, rising stem, WOG 00 non-shock rating. Threaded ends to ASME B Valves to be lockable. 2" & Above Class 250, cast iron body ASTM A12 Gr. B, renewable bronze seats, wedge disc, outside stem and yoke, rising brass or bronze stem, flanged ends to ASME B1.1. Valves to be lockable. 1 ½ " & Below Class 300, bronze body, composition disc with TFE seat, rising stem, WOG

4 201/11/2 4/9 00 non-shock rating. Threaded ends to ASME B Valves to be lockable. 2" & Above Class 250, cast iron body, ASTM A12 Gr. B, bronze trim, renewable seats and disc, outside stem and yoke, rising brass or bronze stem, flanged ends to ASME B1.1. Valves to be lockable. 1 ½ " & Below Class 300 bronze swing check, renewable bronze disc, screwed cap, WOG 00 non-shock rating. Threaded ends to ASME B Check Valves 2" & Above Class 250, cast iron body, ASTM A12 Gr. B, bronze trim, silent check, stainless steel spring, wafer style to match Class 250/300 flanges, ASME B1.1 -OR- 2" through 10" - Cast iron body swing check valve, integrally grooved for use in conjunction with grooved pipe systems, spring loaded disc, minimum pressure rated 300 PSIG. Victaulic Vic-Check valve, Series 712 / 71 Gruvlok Series " through 10" Cast iron body butterfly valve, integrally grooved for use in conjunction with grooved pipe systems, EPDM disc coating. Lever operator for 2" to 4" and gear operated for " to 10". Valves rated 300 PSIG minimum differential in closed position. Valves to be lockable. Butterfly Valves Victaulic Vic-300 butterfly valve (PPS Body Coating) Gruvlok Series 7700 butterfly valve (nylon body coating) or equal Note: 1. Where slow opening characteristics are required to eliminate the possibility of water hammer, replace the lever operator with optional gear operator. Use nitrile disc coating where water is contaminated with oil, or where possibility of oil contamination exists. Ball Valves ½ " & Smaller 00 psi minimum rating, brass or bronze body, stainless steel or chrome-

5 201/11/2 5/9 plated ball, teflon seats, reinforced teflon seals, threaded to ASME B Valves to be lockable 2" through " Cast iron body ball valve, integrally grooved for use in conjunction with grooved pipe systems, TFE seat, polished steel ball and shaft. Lever operated for 3" and below and gear operated for 4" & ". Valves rated 00 PSIG minimum. Valves to be lockable. Victaulic Vic-Ball valve, Series 721 (4 and only) Gruvlok Ball Valve, Series 7500 (2 and 4 only) Instrument Isolation Valves Safety Relief Valves Pressure Reducing Valves ½ " size ball valve, 00 psi minimum rating, brass or bronze body, stainless steel or chrome-plated ball, teflon seats, reinforced teflon seals, threaded to ASME B Selection by Engineer Selection by Engineer 1½ " & Smaller Class 300, bronze body, Y-type strainer, screwed cap complete with blow-off plug, 1/32" perforated stainless steel screen. Threaded ends to ASME B " & Above Class 250, cast iron body, ASTM A12 Gr. B, Y-type strainer, bolted cover complete with blow-off connection and plug,.045' -.02" perforated stainless steel screen. Flanged ends to ASME B1.1 Strainers -OR- 2" through 10" - Cast iron body Tee or Wye type strainer, integrally grooved for use in conjunction with grooved pipe systems,.02" -.125" perforated stainless steel screen, minimum pressure rated 300 PSIG. Victaulic Vic-Strainer, Style 730 / 732 Gruvlok Tee Strainer Fig 720 Gruvlok Wye Strainer model 758G Gruvlok Wye Strainer model 78G (2 to only)

6 201/11/2 /9 3.0 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. 4.0 APPENDICES Appendix A: Branch Connections

7 201/11/2 7/9 5.0 REVISION AND TRANSITION NOTES Revision notes describe: what was changed, and if applicable, why it was changed, and the plan to implement the change, including whether changes are retroactive. Note: The revision notes are a summary of the changes and may not necessarily be a complete list. A risk code is entered for each revision and if applicable, the revision notes will describe how risk was addressed for the revision. Risk Code A Risk Category This revision is a minor change and/or introduces no risk. B C Risk has been addressed for this revision by the reviewer and approver. Low risk or no new hazards identified. For this revision, a PHR or other risk management tool has been used to address risk and minimize hazards. This risk assessment has been documented and is available through Central Engineering. Rev Revision Notes Specification updated and format and number changed. Previous number Rev 2 Approved for use in Thompson Piping system Approval Requirements for MB updated Reference to SPEC corrected in Reference document section. No technical changes Standards Review Title changed from 250 psig to 225 psig to reflect the nominal operating pressure. Added some reference codes/ standards - Changed Pressure Rating to Design Conditions. Changed design conditions maximum temperature from 150 to 149 F to be consistent with other specifications and changed operating conditions from 110 F to ambient temperature as this will be the normal temperature. Replaced paragraph with list of requirements in Design Fabrication Installation section for clarity. Added ASME B3.10 references to the Pipe Section. The lb. was removed from Class designations per ASME definition. ANSI/ASME designations changed to ASME. Added ASME B1.11 and MSS SP-97 reference to Branch Connection section. Removed duplicate content that is in the SPEC or PROC. Added inspection criteria per code. Clarified examination requirements. Note: The above changes are applicable to any new installations and/or modifications to existing systems from this date forward. Format updated Options added for couplings, flanges and valves Risk Code Approved by Reviewed by Issue Date YYYY/MM/DD --- BML BML 2012/04/2 --- BML BML 2012/10/ BML AD 2012/11/ MF MF 2015/05/14 A M.Fogarty B.Morris 201/10/31

8 201/11/2 8/9 Rev Revision Notes Sch80 changed to sch40 to align with Mine procedures and therefore cut grooving has been replaced with roll grooving to meet pressure requirement. Testing section removed and Standard added to Sec 1. Risk Code Approved by Reviewed by Issue Date YYYY/MM/DD A M. Fogarty B. Morris 2017/11/17

9 201/11/2 9/9 APPENDIX A: BRANCH CONNECTIONS Inches B R A N C H / / Inches /4 1/2 Header 1 = Equal Tee 2 = Reducing Tee 3 = Half Coupling (Threaded or socket weld) 4 = Threadolet, Sockolet, Weldolet Note: Use ductile iron reducing tee fittings with grooved pipe outlets, if available

This specification describes the minimum requirements for piping systems for the following service:

SPEC-3004 1/7 1.0 APPLICATION This specification describes the minimum requirements for piping systems for the following service: Service Water Design Conditions Operating Conditions 10 PSIG @ 33 o F to