Engineering Drawing for Atmospheric Distillation Unit

Hi,

I need a detailed engineering drawing for a 500 BPD Atmospheric Distillation Unit (CDU).

Technical Specs:
* Feed: 500 bbl/day crude oil
* Main Column: Vertical, 70 cm ID, 12 Sieve Trays
* Tray details: 12mm holes, triangular pitch 35mm, SS316, 4mm thickness
* Downcomer + Weir (60mm height) included
* Pre-heat train: 3 Shell&Tube exchangers
* Charge Furnace: 360-372°C outlet
* Desalter unit upstream

Deliverables:
* PFD + P&ID (ISO standard symbols)
* Manufacturing drawings: DWG + PDF
* Full dimensions, materials, welding specs (ASME/ASTM)
* Tray layout with hole pattern (CNC-ready if possible)

Notes:
- I'm familiar with fabrication shops in Gujarat (Ahmedabad/Vapi) and know the local capabilities for pressure vessel drafting.
- Need clean, workshop-ready drawings – no conceptual/AI-style sketches.
- Prefer someone with prior refinery/petrochemical equipment experience.

Please share:
1. Final fixed price (not hourly)
2. Delivery timeline
3. 1-2 similar portfolio samples (trays/columns preferred)

Specs are locked, so minimal revisions expected.

Thanks.