{“@context”: “https://schema.org”, “@graph”: [{“@type”: “TechArticle”, “headline”: “Sulfuric Acid (Hu2082SOu2084) Dosing Pump: Metallurgy, Sizing & Selection Guide”, “description”: “Select the right sulfuric acid (H2SO4) dosing pump. Alloy 20 (CN7M) & solid PTFE liquid ends, API 675 +/-1% accuracy, and safe dilution design for process plants.”, “author”: {“@type”: “Person”, “name”: “Amar Shah, B.E. (Mechanical)”, “jobTitle”: “Proprietor & Chief Mechanical Engineer (40+ Years Experience)”, “worksFor”: {“@type”: “Organization”, “name”: “Jagdish Engineering Works (JEW Pumps)”}}, “publisher”: {“@type”: “Organization”, “name”: “JEW Pumps”, “url”: “https://jewpump.com/”}}, {“@type”: “FAQPage”, “mainEntity”: [{“@type”: “Question”, “name”: “Why is Alloy 20 preferred over SS 316 for sulfuric acid dosing?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “SS 316 experiences severe uniform corrosion in sulfuric acid concentrations between 20% and 80%, and pitting in warm concentrated acid. Alloy 20 contains 32-38% nickel, 19-21% chromium, and copper, rendering it practically immune to sulfuric acid attack up to 65u00b0C.”}}, {“@type”: “Question”, “name”: “Can a diaphragm pump handle concentrated sulfuric acid safely?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Yes. A glandless PTFE diaphragm pump eliminates dynamic stuffing box seals, completely eliminating the risk of external acid dripping and protecting operators from toxic chemical contact.”}}, {“@type”: “Question”, “name”: “What flow and pressure capacities can JEW supply for Hu2082SOu2084?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “JEW supplies sulfuric acid dosing pumps ranging from 0.5 LPH to 5000 LPH at operating discharge pressures from 2 bar up to 150 bar.”}}]}]}
Sulfuric Acid (H₂SO₄) Dosing Pump: Metallurgy, Sizing & Selection Guide
For dosing 93% to 98% concentrated sulfuric acid (H₂SO₄) at ambient temperatures, Alloy 20 (UNS N08020) and virgin PTFE are the industry-standard wetted materials. While standard SS 316 suffers rapid intergranular boundary attack, Alloy 20’s 34% nickel content provides total resistance against aggressive sulfuric acid corrosion.
Corrosion & Dosing Dynamics: Sulfuric Acid (H₂SO₄)
Sulfuric acid exhibits drastic variations in corrosiveness depending on concentration and operating temperature. In dilute concentrations (10% to 70%), sulfuric acid behaves as a severe reducing acid where conventional stainless steels pit within days. Concentrated sulfuric acid (93–98%) is oxidizing at room temperature but becomes aggressively corrosive above 45°C. Water contact creates an exothermic reaction; therefore, moisture intrusion into the liquid end must be prevented with moisture-barrier seals.
Recommended Engineering Specifications for Sulfuric Acid (H₂SO₄)
| Parameter | JEW Factory Recommendation |
|---|---|
| Recommended Pump Type | Reciprocating Plunger Metering Pump (GDP Series) or Glandless Hydraulic Diaphragm |
| Liquid End Metallurgy (Concentrated 93–98%) | Alloy 20 (ASTM A351 CN7M) / Solid Virgin PTFE / Hastelloy C-276 |
| Liquid End Metallurgy (Dilute 10–70%) | Solid Machined PVDF (Kynar) / Pure Virgin PTFE with Ceramic Plungers |
| Diaphragm Construction | PTFE-faced multi-layer composite diaphragm with secondary containment |
| Plunger Material | Alumina Ceramic (99.7% Al₂O₃) / Solid Alloy 20 Plunger |
| Check Valve Balls & Seats | High-Alumina Ceramic or PTFE Balls with Hastelloy C-276 / Alloy 20 seats |
| Gland Packing Seals | Virgin PTFE Chevron V-Rings / Graphite Asbestos-Free Glands |
| Dosing Accuracy Tolerance | ±1% steady-state repeatability conforming to API 675 standards |
Piping, Priming & Installation Best Practices
- Flooded Suction Installation: Always install the pump with a flooded suction head to ensure check valves remain primed and prevent dry-running friction on sulfuric acid packings.
- Exothermic Dilution Protection: When dosing concentrated sulfuric acid into water lines, always inject via an Alloy 20 injection quill positioned at the centerline of turbulent pipe flow to dissipate exothermic reaction heat.
- Moisture Ingress Prevention: Vent storage tanks and calibration pots through desiccant silica gel breathers to prevent ambient moisture absorption by hygroscopic sulfuric acid.
- Pressure Relief Bypass: Install an Alloy 20 pressure relief valve set at 1.1x line pressure returning directly to the chemical supply vessel.
Frequently Asked Engineering Questions
Need Sizing or Quotation for Sulfuric Acid (H₂SO₄) Dosing?
Jagdish Engineering Works manufactures custom chemical dosing pumps and turnkey skids with 55+ years heritage. Delivered with Mill Test Certificates & Hydrostatic Test Logs.
💬 Chat on WhatsApp with Chemical Pump Engineer
Jagdish Engineering Works, Mumbai – manufacturer of plunger and diaphragm metering pumps and pressure relief valves since 1969. Our engineers design, test and repair dosing pumps for water treatment, chemical, refinery, fertilizer, sugar and paper plants.
About JEW · Engineering resources · Ask an engineer on WhatsApp