Midsouth Urban Mixed-Use: 54 Issues Found

Summary: The Electrical Load List shows Pan Grinding Plant Motors (PAN-02-001-MXX) split into two groups: 60 HP with VFD=Y and 804.25 HP with VFD=N. The Single Line Diagram shows two discrete Pan Grinding motors (Pan Grinding-1 and Pan Grinding-2) each rated at 400 HP and each fed through a VFD on switchboards LV-SWBD-01 and LV-SWBD-02 respectively. The...

Why it matters: An 800 HP discrepancy in VFD-driven load (2 × 400 HP) significantly impacts switchboard sizing, transformer loading, harmonic analysis, cable specifications, and total project VFD cost. The load list demand calculations (kW subtotals, transformer losses, and margins) would need to be revised if these motors require VFDs, potentially affecting...

Suggested next step: Please clarify the VFD requirement for the main Pan Grinding motors. The Single Line Diagram shows Pan Grinding-1 Motor (400 HP) and Pan Grinding-2 Motor (400 HP) each fed through VFDs, while the Electrical Load List classifies 804.25 HP of Pan Grinding Plant Motors (PAN-02-001-MXX) as non-VFD. Please confirm the correct VFD designation, update...

RFI draft: Please clarify the VFD requirement for the main Pan Grinding motors. The Single Line Diagram shows Pan Grinding-1 Motor (400 HP) and Pan Grinding-2 Motor (400 HP) each fed through VFDs, while the Electrical Load List classifies 804.25 HP of Pan Grinding Plant Motors (PAN-02-001-MXX) as non-VFD....

Summary: The Electrical Load List shows Pellet Mill Plant Motors (PLT-05-001-MXX) split into two groups: 20 HP with VFD=Y and 694.25 HP with VFD=N. The Single Line Diagram shows two discrete Pellet Mill motors (Pellet Mill-1 and Pellet Mill-2) each rated at 335 HP and each fed through a VFD on switchboards LV-SWBD-01 and LV-SWBD-02 respectively. The 335...

Why it matters: A 670 HP discrepancy in VFD-driven load (2 × 335 HP) significantly impacts switchboard feeder sizing, transformer demand, harmonic distortion calculations, cable routing, and VFD procurement costs. The load list kW demand totals and margin calculations would require revision if these motors require VFDs, as VFD efficiency losses differ from...

Suggested next step: Please clarify the VFD requirement for the main Pellet Mill motors. The Single Line Diagram shows Pellet Mill-1 Motor (335 HP) and Pellet Mill-2 Motor (335 HP) each fed through VFDs, while the Electrical Load List classifies 694.25 HP of Pellet Mill Plant Motors (PLT-05-001-MXX) as non-VFD. Please confirm the correct VFD designation, update...

RFI draft: Please clarify the VFD requirement for the main Pellet Mill motors. The Single Line Diagram shows Pellet Mill-1 Motor (335 HP) and Pellet Mill-2 Motor (335 HP) each fed through VFDs, while the Electrical Load List classifies 694.25 HP of Pellet Mill Plant Motors (PLT-05-001-MXX) as non-VFD....

Summary: The sheet notes state the drawing is only a pricing basis and 'SHOULD NOT BE USED FOR FABRICATION, INSTALLATION, CONSTRUCTION, OR RECORD.' The same sheet is also marked 'PRELIMINARY - NOT FOR CONSTRUCTION,' and Note 2 says final design details are to be provided by the engineer of record.

Why it matters: This page is explicitly not a final construction design. Using it as a permit or installation basis can lead to rejection, scope gaps, or rework because the issuer states that final design is still pending.

Suggested next step: Provide the finalized engineer-of-record electrical single-line issued for permit/construction use, and identify which drawing revision governs procurement and installation.

RFI draft: Provide the finalized engineer-of-record electrical single-line issued for permit/construction use, and identify which drawing revision governs procurement and installation.

Summary: The single line diagram shows two ORC generators, each rated at 2790 KW (480V, 3PH, 3W, 60HZ), for a combined total of 5,580 KW (5.58 MW). The Process Design Basis specifies the Turbine Generators at a Total Power Out of 6 MW. This is a 420 KW (7%) discrepancy between the two documents for the same power generation equipment.

Why it matters: This mismatch affects upstream transformer sizing, switchboard bus ratings, utility interconnection capacity, and the overall facility power balance. If the generators are actually 3 MW each (to meet the 6 MW spec), the ORC-LV-SWBD-01 and ORC-LV-SWBD-02 switchboards (currently rated 4000A at 480V) and their associated protective devices...

Suggested next step: Please clarify the correct power output rating for each ORC turbine generator. The Process Design Basis states a total of 6 MW from two turbine generators (implying 3 MW each), while the Single Line Diagram shows each ORC generator rated at 2790 KW (5580 KW total). Which value governs, and should the other document be revised accordingly?

RFI draft: Please clarify the correct power output rating for each ORC turbine generator. The Process Design Basis states a total of 6 MW from two turbine generators (implying 3 MW each), while the Single Line Diagram shows each ORC generator rated at 2790 KW (5580 KW total). Which value governs, and...

Summary: The Heat and Material Balance calculation states that the biochar output stream (15,326 lb/h at 20.0% moisture) is routed 'To Continuous Mixer.' However, the P&ID PR-PD-008 shows the biochar discharge from the Biochar Collection Conveyor CNV-04-001 leaving the sheet with the destination label 'BIOCHAR 011 PR-PD-009 TO BIOCHAR SILO.' This is a...

Why it matters: This discrepancy affects the entire downstream process configuration, equipment sizing, and layout. A continuous mixer and a storage silo are fundamentally different equipment with different footprints, structural supports, utility connections, and control requirements. If the biochar truly goes to a continuous mixer (e.g., for blending with...

Suggested next step: Please clarify the intended destination of the biochar product stream exiting the Pyrolysis Rotary Drums (PRD 1–4). The Heat and Material Balance (251232-PR-MD-002-A, Sheet 2) indicates 'To Continuous Mixer,' while P&ID PR-PD-008 routes the biochar via conveyor CNV-04-001 to 'BIOCHAR SILO' (reference PR-PD-009). Please confirm which destination...

RFI draft: Please clarify the intended destination of the biochar product stream exiting the Pyrolysis Rotary Drums (PRD 1–4). The Heat and Material Balance (251232-PR-MD-002-A, Sheet 2) indicates 'To Continuous Mixer,' while P&ID PR-PD-008 routes the biochar via conveyor CNV-04-001 to 'BIOCHAR SILO'...

Summary: The Process Flow Diagram PR-PF-001 shows a total mass flow rate of 124.7 STPH at 45.8% MC on the main conveyor feeding the Green Screen. However, the Green Fiber Mass Balance calculation shows only 44.3 STPH at 45.8% MC as Fiber In to the Woodyard Green Screening step (which corresponds to the Green Screen on the drawing). This is a difference...

Why it matters: This discrepancy has significant implications for equipment sizing, conveyor capacity, and structural support design. If the actual design throughput is 124.7 STPH, the mass balance substantially underestimates the material volume, which could lead to undersized downstream equipment (green screen, conveyors, storage). Conversely, if 44.3 STPH...

Suggested next step: Please clarify the correct total mass flow rate to the Green Screen / Woodyard Green Screening. Drawing PR-PF-001 shows 124.7 STPH at 45.8% MC on the main conveyor to the Green Screen, while the mass balance calculation (251232-PR-MD-001-A) shows only 44.3 STPH at 45.8% MC as Fiber In to Woodyard Green Screening. Please confirm which value is...

RFI draft: Please clarify the correct total mass flow rate to the Green Screen / Woodyard Green Screening. Drawing PR-PF-001 shows 124.7 STPH at 45.8% MC on the main conveyor to the Green Screen, while the mass balance calculation (251232-PR-MD-001-A) shows only 44.3 STPH at 45.8% MC as Fiber In to...

Summary: The Electrical Load List shows equipment tag HOG-02-001-MXX (Wood Hog Motor) at 500 HP with VFD designation 'N' (no VFD). However, the Single Line Diagram on LV-SWBD-01 clearly depicts the Wood Yard Hog Motor at 500HP being fed through a VFD box before the motor symbol. These two documents directly contradict each other on whether this 500 HP...

Why it matters: A 500 HP VFD is a major piece of equipment affecting cost, physical space, harmonic distortion mitigation, feeder conductor sizing (VFD duty rated cables), and switchboard/MCC configuration. If the VFD is required but omitted from the load list, the operating kW demand calculations and the downstream protective device coordination would also be...

Suggested next step: Please clarify whether the Wood Hog Motor (HOG-02-001-MXX, 500 HP) requires a VFD. The Electrical Load List shows VFD = N, while the Single Line Diagram shows this motor fed through a VFD on LV-SWBD-01. Please update the conflicting document accordingly and confirm the impact on feeder sizing and demand calculations.

RFI draft: Please clarify whether the Wood Hog Motor (HOG-02-001-MXX, 500 HP) requires a VFD. The Electrical Load List shows VFD = N, while the Single Line Diagram shows this motor fed through a VFD on LV-SWBD-01. Please update the conflicting document accordingly and confirm the impact on feeder sizing...

Summary: The Electrical Load List shows BLW-07-003-M01 (ORC Exhaust Blower 1 Motor, 50 HP) and BLW-07-004-M01 (ORC Exhaust Blower 2 Motor, 50 HP), both with VFD designation 'N'. However, the Single Line Diagram shows both ORC-1 Exhaust Blower Motor and ORC-2 Exhaust Blower Motor at 50HP being fed through VFD boxes on switchboards LV-SWBD-03 and...

Why it matters: VFDs for the ORC exhaust blowers would affect speed control capability, feeder cable selection (VFD duty rated), switchboard breaker sizing and coordination, harmonic analysis, and overall project cost. If the process requires variable speed control for exhaust blower operation, omitting VFDs from the load list impacts the demand calculations...

Suggested next step: Please clarify whether the ORC Exhaust Blower 1 Motor (BLW-07-003-M01, 50 HP) and ORC Exhaust Blower 2 Motor (BLW-07-004-M01, 50 HP) require VFDs. The Electrical Load List shows VFD = N for both, while the Single Line Diagram shows both fed through VFDs. Please update the conflicting document and confirm the impact on load calculations.

RFI draft: Please clarify whether the ORC Exhaust Blower 1 Motor (BLW-07-003-M01, 50 HP) and ORC Exhaust Blower 2 Motor (BLW-07-004-M01, 50 HP) require VFDs. The Electrical Load List shows VFD = N for both, while the Single Line Diagram shows both fed through VFDs. Please update the conflicting document...

Summary: The PFD (PR-PF-004) labels the incoming feed to the Re-Entry Hopper as 'FROM PELLET SCREEN', indicating recirculated material from a pellet screening operation. However, the P&ID (PR-PD-007) labels the same incoming feed to the Re-Entry Hopper as 'FROM DRYER/COOLER', indicating material from a completely different upstream source. Both...

Why it matters: This discrepancy directly affects process routing, pipe/conveyor sizing, and material specifications. Material from a pellet screen (fines/undersized pellets) has different characteristics (particle size, temperature, moisture content) than material from a dryer/cooler. Incorrect source identification could lead to improperly sized conveyors,...

Suggested next step: Please clarify the correct source feeding the Re-Entry Hopper. The PFD (PR-PF-004) identifies the source as 'FROM PELLET SCREEN' while P&ID PR-PD-007 identifies it as 'FROM DRYER/COOLER'. Please confirm which is correct and update the conflicting drawing accordingly.

RFI draft: Please clarify the correct source feeding the Re-Entry Hopper. The PFD (PR-PF-004) identifies the source as 'FROM PELLET SCREEN' while P&ID PR-PD-007 identifies it as 'FROM DRYER/COOLER'. Please confirm which is correct and update the conflicting drawing accordingly.

Summary: The Piping Line List identifies line 4'-HW-012 as a 4' hot water line starting at CLR-07-001 (Adiabatic Cooler 1) and ending at 6'-HW-018. However, on P&ID PR-PD-015 (ORC Exhaust & Coolers), the return line from Adiabatic Cooler 1 (CLR-07-001) is labeled 2'-HW-012-IN, indicating a 2' size. The same sequence number (012) and start equipment...

Why it matters: This is a significant pipe size discrepancy (4' vs 2') on a hot water return header that collects flow from multiple adiabatic coolers. A 4' header would be appropriate for collecting the combined return flow from all six coolers, while a 2' line matches the individual cooler branch returns (2'-HW-013 through 2'-HW-017). If the line is actually...

Suggested next step: Please clarify the correct pipe size for line HW-012, the hot water return from Adiabatic Cooler 1 (CLR-07-001). The Line List specifies 4' (4'-HW-012) while P&ID PR-PD-015 shows 2' (2'-HW-012-IN). Please confirm the correct size and revise the Line List or P&ID as needed.

RFI draft: Please clarify the correct pipe size for line HW-012, the hot water return from Adiabatic Cooler 1 (CLR-07-001). The Line List specifies 4' (4'-HW-012) while P&ID PR-PD-015 shows 2' (2'-HW-012-IN). Please confirm the correct size and revise the Line List or P&ID as needed.

Summary: The Piping Line List identifies natural gas line sequence 001 as TBD-NG-001 with a TBD (to be determined) size and all specifications marked as 'By Supplier'. However, the Instrument List references flow instruments FE-08-002 and FT-08-002 as installed on line 3'-NG-001, implying the line has been sized at 3 inches. Both documents agree the...

Why it matters: If the natural gas line size is still TBD as indicated by the Piping Line List, then the Instrument List has prematurely assigned a 3' size, which could result in incorrect flow element sizing and flow transmitter calibration. Conversely, if the line has been confirmed as 3', the Piping Line List has not been updated. This inconsistency affects...

Suggested next step: Please clarify the correct size and line designation for NG line sequence 001 on PR-PD-016. The Piping Line List (251232-PR-LI-002-A) shows it as TBD-NG-001 with size TBD and specs 'By Supplier', while the Instrument List (251232-PR-LI-003-A) references it as 3'-NG-001. Please confirm the final line size and update both documents to use a...

RFI draft: Please clarify the correct size and line designation for NG line sequence 001 on PR-PD-016. The Piping Line List (251232-PR-LI-002-A) shows it as TBD-NG-001 with size TBD and specs 'By Supplier', while the Instrument List (251232-PR-LI-003-A) references it as 3'-NG-001. Please confirm the final...

Summary: The Instrument List (Document 0, Page 3) assigns level switch LS-06-012 to equipment 'SIL-06-012' and level switch LS-06-013 to equipment 'SIL-06-013'. However, P&ID PR-PD-012 (Document 1, Page 13) clearly shows both LS 06-012 and LS 06-013 mounted on the FINISHED PRODUCT SILO tagged SIL-06-001. Equipment tags SIL-06-012 and SIL-06-013 do not...

Why it matters: Incorrect equipment tag assignments in the Instrument List will propagate errors into instrument specification sheets, cable/wiring schedules, loop diagrams, and procurement documentation. During construction, installers relying on the Instrument List would look for silos SIL-06-012 and SIL-06-013 that do not exist, causing confusion and...

Suggested next step: Please clarify the correct equipment association for LS-06-012 and LS-06-013 in the Instrument List. P&ID PR-PD-012 shows both instruments mounted on FINISHED PRODUCT SILO SIL-06-001, but the Instrument List references equipment SIL-06-012 and SIL-06-013, which do not appear on any P&ID. Please confirm whether the equipment column should be...

RFI draft: Please clarify the correct equipment association for LS-06-012 and LS-06-013 in the Instrument List. P&ID PR-PD-012 shows both instruments mounted on FINISHED PRODUCT SILO SIL-06-001, but the Instrument List references equipment SIL-06-012 and SIL-06-013, which do not appear on any P&ID. Please...

Summary: The Process Flow Diagram PR-PF-008 (Balance of Plant Water & Natural Gas) graphically depicts two fire water pumps arranged in parallel from the Fire Water Tank, serving a common discharge header to distribution. However, the Electrical Load List on Page 3 includes only a single fire water pump motor entry: PMP-08-001-M01 'Fire Water Pump 1...

Why it matters: If the second fire water pump is electrically driven, the omission of approximately 150 HP from the load list impacts the Total Connected HP (currently reported as 6,619.2 HP) and the total connected kW, affecting upstream electrical infrastructure sizing including switchgear, transformers, and utility service capacity. If the second pump is...

Suggested next step: Please clarify whether the second fire water pump shown on PFD PR-PF-008 is electrically driven or diesel-driven. If electrically driven, please update the Electrical Load List to include the second fire water pump motor (e.g., PMP-08-002-M01) with appropriate ON/OFF standby designation. If diesel-driven, please confirm that no associated...

RFI draft: Please clarify whether the second fire water pump shown on PFD PR-PF-008 is electrically driven or diesel-driven. If electrically driven, please update the Electrical Load List to include the second fire water pump motor (e.g., PMP-08-002-M01) with appropriate ON/OFF standby designation. If...

Summary: The Piping Line List identifies line 2'-NG-003 as a 2' natural gas line terminating at PRD-04-002, and line 2'-NG-004 as a 2' natural gas line terminating at PRD-04-004. However, on P&ID PR-PD-007 (PRD 1 & 2), the natural gas connection at PRD 2 is labeled as 1 1/2'-NG-003, indicating a 1-1/2' line. Similarly, on P&ID PR-PD-008 (PRD 3 & 4), the...

Why it matters: This size discrepancy affects pipe sizing, valve specification, and material takeoff for the natural gas service at two of the four PRD units. Incorrect pipe sizing could impact gas supply capacity (the line list specifies 400 SCFM at 60 PSIG for these lines). If the correct size is 1-1/2', branch line entries are missing from the line list; if...

Suggested next step: Please clarify the correct natural gas pipe size at the PRD 2 and PRD 4 connections. Are separate 1-1/2' branch lines intended (similar to NG-007 and NG-008 for PRD 1 and PRD 3), or should the 2' headers (NG-003 and NG-004) connect directly to the PRDs as shown in the Line List? Please revise the Line List or P&IDs accordingly.

RFI draft: Please clarify the correct natural gas pipe size at the PRD 2 and PRD 4 connections. Are separate 1-1/2' branch lines intended (similar to NG-007 and NG-008 for PRD 1 and PRD 3), or should the 2' headers (NG-003 and NG-004) connect directly to the PRDs as shown in the Line List? Please revise...

Summary: The Piping Line List identifies line 1 1/2'-PW-004 as a 1-1/2' process water line terminating at PRD-04-002, and line 1 1/2'-PW-005 as a 1-1/2' process water line terminating at PRD-04-004. However, on P&ID PR-PD-007, the process water connection at PRD 2 is labeled 1'-PW-004-IN (1' size). On P&ID PR-PD-008, the process water connection at PRD...

Why it matters: The process water line size discrepancy (1-1/2' vs 1') affects water flow capacity, pressure drop calculations, and material procurement for two of four PRD units. The line list specifies 11.5 GPM at 100 PSIG, 40°F for these lines with heat tracing. If the correct size is 1', the line list entries need updating; if 1-1/2', the P&IDs need...

Suggested next step: Please clarify the correct process water pipe size at the PRD 2 and PRD 4 connections. The Line List specifies 1-1/2' (1 1/2'-PW-004 and 1 1/2'-PW-005), but the P&IDs show 1' at the PRD connection points. Please confirm the correct size and revise the applicable documents.

RFI draft: Please clarify the correct process water pipe size at the PRD 2 and PRD 4 connections. The Line List specifies 1-1/2' (1 1/2'-PW-004 and 1 1/2'-PW-005), but the P&IDs show 1' at the PRD connection points. Please confirm the correct size and revise the applicable documents.