UL 51
Standard for Power-Operated Pumps and Bypass Valves for Anhydrous Ammonia, LP-Gas, and Propylene

DETAILS
Edition Number:10SCC Approved:--
Edition Date:2013-05-31DOD Approved: --
Price Code:BANSI Approved: 2018-10-04
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover power-operated pumps and bypass valves for use in liquid transfer operations in non-refrigerated systems in installations for:

    a)    Anhydrous ammonia systems installed in accordance with the Safety Requirements for the Storage and Handling of Anhydrous Ammonia, CGA/GAS G-2.1 (ANSI K61.1);

    b)    Liquefied petroleum gas (LP-Gas) systems installed in accordance with the Liquefied Petroleum Gas Code, NFPA No. 58; and

    c)    Propylene systems.

    1.2 These requirements do not cover:

    a)    Pumps or compressors intended for handling anhydrous ammonia or LP-Gas or propylene in the gaseous phase and

    b)    Pumps, compressors or bypass valves for anhydrous ammonia, LP-Gas, or propylene for use in chemical, petro-chemical, petroleum, or utility power plants; nor pipeline or marine terminals; nor related storage facilities at such plants or terminals.

    1.3 Equipment covered by these requirements is for use with LP-Gas, propylene, or anhydrous ammonia as covered by the Standards and Codes in 1.1 and shall have a minimum service pressure rating in accordance with Table 1.1.

    A pump without an integral bypass valve with a higher differential pressure obtained in the Differential Pressure Test, Section 17, is permitted to have a lower minimum service pressure rating if it is marked in accordance with 25.2.

    Table 1.1 - Minimum service pressure for rating pumps and bypass valves

    Maximum differential pressure produced when subjected to the Differential Pressure Test, Section 17

    Anhydrous ammonia and LP-Gas equipment minimum service pressure rating

    Propylene equipment minimum service pressure rating

    psig (kPa)

    psig (kPa)

    psig (kPa)

    ≤ 100 (689) Propylene equipment only

    Not applicable

    350 (2415)

    ≤ 125 (862)

    350 (2415)

    375 (2585)

    >125 (863) ≤ 150 (1034)

    375 (2586)

    400 (2758)

    >150 (1034) ≤ 200 (1379)

    400 (2758)

    425 (2930)

    ≥ 200 (1379)

    200 + differential pressure produced (1379 + differential pressure produced)

    225 + differential pressure produced (1551 + differential pressure produced)

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Units of Measurement
          • 4 Undated References
          • 5 Glossary
        • CONSTRUCTION
          • 6 Assembly
          • 7 Materials
          • 8 Bodies, Covers, and Heads
          • 9 Strainers
          • 10 Springs
          • 11 Pumps and Bypass Valves Pressure Ratings
          • 12 Relief Valves
          • 13 Guards
          • 14 Pipe Connections
        • PERFORMANCE
          • 15 General
          • 16 Deformation Test
          • 17 Leakage Test
          • 18 Endurance Test – Pump
          • 18A Endurance Test – By-Pass Valve
          • 19 Differential Pressure Test
          • 20 Hydrostatic Strength Test
          • 21 Moist Ammonia Air Stress Cracking Test
          • 22 Tests for Synthetic Rubber Parts
            • 22.1 General
            • 22.2 Volume change test
            • 22.3 Weight loss test
          • 23 Comparative Corrosion Tests
            • 23.1 General
            • 23.2 Tests in the presence of salt spray (fog)
            • 23.3 Tests in the presence of moist hydrogen sulfide-air mixture
            • 23.4 Tests in the presence of moist sulfur dioxide-carbon dioxide-air mixture
        • MANUFACTURING AND PRODUCTION TESTS
          • 24 General
        • MARKINGS
          • 25 Details
        • INSTALLATION AND OPERATING INSTRUCTIONS
          • 26 Details
    • APPENDIX A