Standards, Economics & Procurement | DAIER Chemical Separation Standard

Engineering Reference for Process Engineers

 

Section 14: Industry Standards and Benchmarking

70. Q: What are the major industry standards for tower packing?A: ASTM B127 for nickel alloys, ASTM A240 for stainless steel. ASME VIII for pressure vessel design. ISO 9001 for quality management. For performance testing, FRI (Fractionation Research Institute) publishes standardized test data for many packing types.

71. Q: Who are the major global suppliers of tower packing?A: Sulzer, Koch-Glitsch, Raschig, Montz, Munters, Vereinigte Füllkörper-Fabriken (VFF). Each has proprietary designs. Many regional suppliers exist, particularly in China. Performance data from FRI provides benchmark comparisons.

72. Q: What is the FRI and why is its data important?A: FRI (Fractionation Research Institute) is an industry consortium that conducts standardized distillation tests on commercial-scale columns. FRI-published HETP and pressure drop data for various packings is the most reliable engineering benchmark.

73. Q: How to compare packing from different suppliers?A: Compare specific surface area, void fraction, packing factor, published HETP vs. F-factor curves, and pressure drop data. Request test results from the same FRI test facility. Material certifications and dimensional tolerances also matter.

74. Q: What is the typical warranty for tower packing?A: One year against manufacturing defects. Performance warranties (e.g., guaranteed HETP) require prior agreement and are based on FRI test data or pilot plant results. Material warranties follow ASTM/EN standards.

 

Section 17: Economic Considerations

89. Q: How to estimate the total installed cost of tower packing?A: Packing material cost: $/m³ (metal: $2000-10000, plastic: $300-1000, ceramic: $500-2000). Internals: distributors, supports add 20-40%. Installation labor: $500-2000/m³ depending on column height. Shipping: depends on volume. Total: often 2-3× material cost.

90. Q: How does packing selection affect operating cost?A: Lower pressure drop reduces compressor/ fan power. Higher efficiency reduces reflux ratio, saving reboiler and condenser energy. Longer service life reduces replacement frequency. A 10% pressure drop reduction saves ~5-10% energy in vacuum distillation.

91. Q: What is the payback period for upgrading to high-performance packing?A: Example: replacing old random packing with structured packing reduces pressure drop by 50% and increases capacity by 30%. Energy savings + capacity increase often gives payback < 1-2 years. For new columns, higher initial cost is offset by smaller diameter and lower height.

92. Q: How to value packing performance in a tender?A: Use life-cycle cost (LCC) analysis: initial cost + installation + energy cost (10 years) + maintenance + replacement cost. Lowest LCC wins. Require guaranteed HETP and pressure drop from supplier, with penalties for non-performance.

 

Section 18: Procurement and Supplier Evaluation

93. Q: What technical documents should be requested from a packing supplier?A: (1) Material certificate (EN 10204 3.1 or equivalent). (2) Dimensional report. (3) Specific surface area calculation. (4) Published performance data (FRI or equivalent). (5) Quality manual (ISO 9001). (6) Reference list of similar applications.

94. Q: How to verify material composition on delivered packing?A: Use PMI (Positive Material Identification) with XRF gun. Test random samples. For SS316L, verify  (ASTM A240). For alloys, verify all elements. Provide test report.

95. Q: What is the difference between “domestic” and “imported” packing quality?A: Quality depends on manufacturer, not origin. Many Chinese manufacturers produce packing meeting international standards. Key is material certification, dimensional consistency, and documented performance testing. FRI testing is expensive but some Chinese suppliers participate.

96. Q: How to evaluate a new packing supplier?A: (1) Request samples and measure dimensions. (2) Request material certificate and PMI report. (3) Ask for customer references. (4) Visit factory (or video tour) to see manufacturing process. (5) Test a small batch in a pilot column if critical.

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