PRESSURE VESSEL INSPECTION REPORT Date: Sept.10, 2014 Equipment ID: 88-D-340

Plant Ethanol Op Unit 88 System Asset # 60094556 Equipment ID 88-D-340 Asset Type Drum Description NH3 Storage Tank Prov. Insp. # S02498 Serial # 38830A Manufacturer MaXfield Inc. CRN P6554.23 Year Built 2005 MAWP 1724 KPag @ 46 0C MDMT -29 0C Code Section VIII, Div 1

(2004) Fluid Service Anhydrous

Ammonia Sweet/Sour PWHT Yes

Internal Access Yes Insulated No Internal Coating No Operating Pressure 240 KPag Operating Temp 1 0C

PSV DATA PSV ID # Location Size Set Capacity Manufacturer Model Last

Inlet Outlet Pressure SCFM / Lbs/Hr / GPM

Service

12056052 88-D-340 2.5” 2.5” 250 psi 9153 SCFM REGO A3149G 2014

INSPECTION SUMMARY

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PRESSURE VESSEL INSPECTION REPORT Date: Sept.10, 2014 Equipment ID: 88-D-340

An internal and external inspection was performed on 88-D-340 Ammonia Storage Tank during a planned maintenance schedule.

• Original shell thickness = 0.6854” (17.41 mm) • Original head(s) thickness = 0.6848” (17.39 mm) • Corrosion allowance = 0 (both shell and heads) • Shell and Heads Material = SA 516-70 • This vessel is for Non-Corrosive Service.

The inspection findings were as follows: External:

• Vessel shell and head condition was acceptable for continued service. • Vessel Manufacturer name plate was intact and secure. • The TSASK sticker was attached and legible. • Surface corrosion exists where paint has failed at the south-west end of vessel. • All tank legs and saddles showed no weld defects. All mounting nuts and bolts were intact. • Fixed liquid level gauge was replaced by MaXfield. • The pressure gauge is broken/non-functioning on the west head. Code CSA B149.2-10 7.5.1 states that a pressure gauge needs to be

operational whenever the vessel is in service. • The temperature gauge was intact and operational. • This vessel has two ground wires and both were intact (located at South-West & South-East ends). • All piping ground clearance was acceptable. • All flange connections had no missing, loose or short bolts. • The Bulk Head was intact with all piping tight and no loose bolts. • The Emergency Shutoff Valve (ESV) appeared to be operational. • A Snappy Joe (Safety Equipment) was installed with its cable control in place. The intent of this equipment is to prevent NH3 from

being released to the atmosphere in case an unloading truck drives away with its hose still attached to the bulk head piping. The Snappy Joe spring assisted valve would close if the piping broke off.

• The liquid valve, vapor excess flow valve, two back check valves and the bottom level gauge valve showed no defects underneath the west end of the vessel.

• No defects were observed on the manway with no scoring present on the gasket face. The old gasket was replaced by MaXfield during the outage.

• The standpipe level gauge replacement was completed by MaXfield. • MaXfield confirmed the rain caps on the PSV stacks would come off if the pressure goes above the 250 psi set pressure. They weren’t

loose fitting at the time of this inspection, but apparently are on tighter to prevent them from being blown off by the wind. Internal:

• A visual inspection found no corrosion; pitting or mechanical deficiencies were present. NDE:

• MaXfield performed an internal Wet Fluorescent Magnetic Particle Inspection (WFMPI) on all six circumferential welds and all nozzle welds. No relevant indications were found on any welds (MaXfield Inc. NDE report number 054356).

PRV:

• Four new pressure relief valves were installed on the PRV manifold during this outage. One PRV is always mechanically plugged off. The manifold can rotate while in service, thus allowing any PRV to be replaced during normal operation if required.

Note: • After all the inspections and repairs were complete, it was Process Operations intent to leave this vessel out of service with a nitrogen

blanket inside. Applying nitrogen gas displaces the presence of oxygen thereby preventing the development of corrosion within the vessel.

RECOMMENDATIONS 1. Paint exterior of vessel where it has failed and surface corrosion exists. 2. Replace non-functioning pressure gauge on north head (completed by MaXfield). 3. Replace manway gasket (completed by MaXfield).

NONCONFORMANCES / INSPECTION DEFICIENCIES

• No NCR’s were issued.

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PRESSURE VESSEL INSPECTION REPORT Date: Sept.10, 2014 Equipment ID: 88-D-340

INSPECTION PLANNING

Inspection Strategy Availability Inspection Interval 10 Years

Inspection Date September 10, 2014

Date of Last Internal Inspection

N/A Date of Next Inspection September 10, 2024

REPORT CERTIFICATION The signatures below certify that inspections/tests have been completed in accordance with the identified inspection strategy and that the specified equipment is considered fit for service until the date of next inspection. Inspected by / Certification # Terry Schulze PEI Class 1 #109, API 510 # 31739 Date January 7, 2015 Reviewed and Approved by Keenan Fowler Date January 7, 2015 Criticality Assessment Rerun Inspection Planning Rerun Assessed Next Inspection Date

DETAILED INSPECTION

VISUAL EXTERNAL

ID Description Condition Location NCR / IDR Comments

V1 General Other (Please Explain)

Good This equipment was found to be acceptable for continued service

V2 General Corrosion Good No corrosion was evident V3 General Leaks Good No leaks were present V4 Vibration N/A V5 Dissimilar Flange Rating Good No dissimilar flange ratings noted V6 Ladder/Stairway N/A V7 Heads Good No defects present V8 Guy Wires N/A V9 Electrical Ground Good Vessel has 2 grounds on skid package V10 Painted Inactive Corrosion Fair Surface corrosion was present where paint was peeling V11 Coating/Painting Fair Paint was peeling in some areas V12 Expansion Joint or Bellows N/A V13 Gauge/Site Glass Poor Pressure gauge was broken V14 Shell Good No defects present V15 Jacket N/A V21 Support Other (Please

Explain) N/A

V22 Foundation Good Steel skid on concrete with no spalling on foundation V23 Anchor Bolts Good All bolts were tight V24 Saddle/Skirt/Legs Good All saddles and legs were in serviceable condition V25 Davit N/A V26 Fireproofing N/A V31 Connections Other (Please

Explain) Good All piping connections were secure

V32 Small Branches Good Instrumentation tubing was acceptable V33 Nozzles Good No defects were observed V34 Manways N/A V35 Reinforcing Pads N/A V36 Inadequate Thread

Engagement Good No short bolting

V37 Bolting Good All bolting was tight V38 Flanges Good All flanges were intact V39 Leak Clamps N/A V41 Insulation Other (Please

Explain) N/A

V42 Damage N/A V43 Penetrations N/A V44 Insulation Jacket N/A V45 Banding N/A V46 Seals/Joints N/A V51 Relief Devices Other

(Please Explain) Good PRV’s replaced during this outage

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PRESSURE VESSEL INSPECTION REPORT Date: Sept.10, 2014 Equipment ID: 88-D-340

ID Description Condition Location NCR / IDR Comments

V52 Corrosion Good No corrosion present V53 Leaks Good No leaks were evident V54 Restricted Inlet/Outlet Good Inlet and Outlet were clear V55 Manual Operation Lever N/A

DETAILED INSPECTION VISUAL INTERNAL

ID Description Condition Location NCR / IDR Comments

V1 General Other (Please Explain)

Good No internal defects were observed

V2 Corrosion (depth, length, width)

Good No corrosion was evident

V3 Erosion Good No erosion was present V4 Distortion Good No distortion was visible V5 Blisters Good No over heating or blisters were observed. V6 Deposits Good No deposits were noted V7 Heads Good No dents or gouges V8 Welds Good No cracking, undercut, overlap or lack of fusion V9 Nozzles Good All clear with no defects V10 Shell Good No erosion, corrosion V11 Gasket Surfaces Good No scoring, dents or gouges V21 Internals Other(Please

Explain) Good No relevant indications found

V22 Demister N/A V23 Baffle/Weir N/A V24 Sparger N/A V25 Thermowells N/A V26 Metallic Linings N/A V27 Nonmetallic Linings N/A V28 Trays N/A V29 Tray Rings N/A V30 Other Welded

Attachments N/A

V31 Tubes N/A V32 Tubesheet N/A

PHOTOS

Vessel Name Plate TSASK Regulatory Sticker

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PRESSURE VESSEL INSPECTION REPORT Date: Sept.10, 2014 Equipment ID: 88-D-340

PHOTOS

(L) Standpipe Level Gauge and (R) Paint Failing on West Head Broken Pressure Gauge

Operational Temperature Gauge

West End Overview

West End Bulk Head

West End Snappy Joe

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PRESSURE VESSEL INSPECTION REPORT Date: Sept.10, 2014 Equipment ID: 88-D-340

West End ESV West End Valves: (L-R) Liquid Excess Flow Valve, Back Check Valve, Vapor Excess Flow Valve, Level Gauge Valve, Back Check Valve

New PRV Sticker Old PRV Name Plate Data

New PRV’s New PRV Top Internal

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PRESSURE VESSEL INSPECTION REPORT Date: Sept.10, 2014 Equipment ID: 88-D-340

Old PRV Bottom Internal

Existing PSV Manifold on top West End of Vessel where PRV’s are

Installed (Note: bottom left opening is plugged off)

PRV Manual Remover/Installer when used with a pipe wrench

PRV Stacks with Rain Caps (laying on catwalk un-installed)

PRV on discharge line to Ethanol Plant PRV Name Plate

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PRESSURE VESSEL INSPECTION REPORT Date: Sept.10, 2014 Equipment ID: 88-D-340

South-West Ground Wire Paint Failing at South-West End of Vessel

South-East Ground Wire East End Manway Opening with Portable Venting Equipment

Old Manway Gasket MaXfield (Blake Fifield) performing internal WFMPI

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PRESSURE VESSEL INSPECTION REPORT Date: Sept.10, 2014 Equipment ID: 88-D-340

Lower Shell Circumferential Welds Top West End Internal Nozzle Opening

Bottom West End Internal Nozzle Openings West End Head Internal

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