PECO Series 55 Heavy Duty Process Liquid Filter Vessels
PECO Series 55 Heavy Duty Process Liquid Filter Vessels – 46-Element, 28" Shell, 230 PSIG (Matched Pair, 2 Units)
Listing Summary
Available for sale is a matched pair of Perry Equipment Corporation (PECO) Series 55 Heavy Duty Process Liquid Filter Vessels. These are large, vertical, multi-element pressure vessels designed for high-capacity liquid filtration in demanding process applications including amine (DEA/MEA/MDEA) treating, glycol dehydration, and sulfinol systems. PECO (now a Parker Hannifin brand) is the industry standard for this class of equipment in the oil and gas sector.
The two units are a true matched pair — built in the same year (1995), from the same original order (consecutive serial numbers 66539-1 and 66539-2), with consecutive National Board numbers (31385 and 31386). They are identical in every specification and can be deployed as a duty/standby pair or as two parallel filter trains.
Both vessels are ASME Code stamped (U-stamp), bear a valid Canadian Registration Number (CRN D0398.6), and are rated for heat-traced service (RT1/HT designation). The vessels are stored outdoors and show surface rust on the external carbon steel shell and swing-bolt closure hardware, which is cosmetic and typical for outdoor-stored pressure vessels. The internal filter element carrier and shell integrity should be verified by a qualified inspector prior to purchase.
Key Specifications
| Specification | Unit 1 (S/N 66539-1) | Unit 2 (S/N 66539-2) |
| National Board No. | 31385 | 31386 |
| Model | 55-46-336-28-230 | 55-46-336-28-230 |
| Number of Filter Elements | 46 | 46 |
| Element Size | PECO Size 336 | PECO Size 336 |
| Shell Nominal Diameter | 28 inches | 28 inches |
| MAWP | 230 PSIG at 450°F | 230 PSIG at 450°F |
| MDMT | -20°F at 230 PSIG | -20°F at 230 PSIG |
| External Pressure Rating | 15 PSIG at 450°F | 15 PSIG at 450°F |
| Corrosion Allowance | 0.125 inches | 0.125 inches |
| Closure Gasket No. | 6-14909 | 6-14909 |
| ASME Code Stamp | U-Stamp (RT1/HT) | U-Stamp (RT1/HT) |
| CRN | D0398.6 | D0398.6 |
| Year Built | 1995 | 1995 |
Model Number Decoder (PECO Series 55):
•55 — Series 55 Heavy Duty Process Liquid Filter (designed for Amines, Glycols, Sulfinols)
•46 — 46 filter elements
•336 — PECO size 336 filter elements
•28 — 28-inch nominal shell diameter
•230 — 230 PSIG design pressure
Typical Applications
PECO Series 55 vessels are the industry standard for process liquid filtration in gas processing, refining, and petrochemical applications. Typical services include:
•Amine Treating (DEA, MEA, MDEA): Filtering degradation products, iron sulfide, and particulates from amine solution to protect absorber trays and reduce foaming
•Glycol Dehydration (TEG/DEG): Filtering glycol to remove particulates and hydrocarbon contamination
•Sulfinol and Selexol Systems: Filtering specialty solvents used in acid gas removal
•General Process Liquid Filtration: Any high-pressure, high-temperature liquid service requiring multi-element cartridge filtration