Midland A-1477 Series Installation, Operation & Maintenance Manual
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Midland A-1477 Series Installation, Operation & Maintenance Manual

Midland A-1477 Series Installation, Operation & Maintenance Manual

External-style pressure relief valve
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Manual content is subject to change.
Visit www.midlandmfg.com for latest manual revision and revision history.
External-Style Pressure Relief Valve
A-1477/A-14167 Series
Installation, Operation & Maintenance (IOM) Manual
P/N: A-1477/A-14167, Rev. 0
Issue Date: February 20, 2017
Supersedes: N/A

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  • Page 1 P/N: A-1477/A-14167, Rev. 0 Issue Date: February 20, 2017 Supersedes: N/A External-Style Pressure Relief Valve A-1477/A-14167 Series Installation, Operation & Maintenance (IOM) Manual Manual content is subject to change. Visit www.midlandmfg.com for latest manual revision and revision history.

  • Page 2: Table Of Contents

    Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Table of Contents " Regulations and Safety Requirements ....................3 Regulations ..........................3 Safety Warnings and Precautions ....................3 Introduction ............................5 Valve Details ..........................5 Valve Installation ..........................

  • Page 3: Regulations And Safety Requirements

    1 Regulations and Safety Requirements Regulations Midland external-style pressure relief valves are used in contact with a variety of products, many of which are hazardous materials and could cause serious injury or damage if mishandled. The acceptance and transportation of products are regulated by the DOT and AAR in the U.S.A., and in Canada by CTC and Transport Canada.
  • Page 4 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. CAUTION: Valve Leakage. Improper valve-tongue seating in the flange groove, loose nuts and damaged gaskets may result in leaks at the valve-mounting joint. CAUTION CAUTION: Incorrect Spring Setting. Never adjust the spring compression of a valve while it is mounted on the vessel cover plate or incorrect settings may result.

  • Page 5: Introduction

    Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 2 Introduction The A-1477 and A-14167 Series External-Style Pressure Relief Valves are designed for use in Chlorine service and to operate at 75 or 165 psig with flow rates from 2,027 to 3,612 standard cubic feet per minute (scfm). Valve Details ITEM QTY.
  • Page 6 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. ITEM QTY. PART NAME MATERIAL PART NUMBER TOP GUIDE STAINLESS STEEL 14-101-SSTF STEM HASTELLOY B/ML 14-2-XB PLUG SEE TABLE BELOW SEE TABLE BELOW BODY STAINLESS STEEL 14-40-MOL STAINLESS STEEL SPRING...
  • Page 7 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. ITEM QTY. PART NAME MATERIAL PART NUMBER TOP GUIDE STAINLESS STEEL 14-101-SSTF STEM HASTELLOY B/ML 14-2-XB PLUG KYNAR (PVDF) 14-3-KY BODY STAINLESS STEEL 14-401-MOL STAINLESS STEEL SPRING SEE TABLE BELOW FOLLOWER...
  • Page 8 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Figure 2-1 Valve Component Identification (Section B-B) – Base and -XX-S01 Series * NOTE: Parts indicated in –XX-S01 Series only. A-1477/A-14167, Rev. 0 Page 8 of 37...
  • Page 9 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Figure 2-2 Valve Component Identification (Section A-A) – Base and -XX-S01 Series A-1477/A-14167, Rev. 0 Page 9 of 37...
  • Page 10 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Figure 2-3 Valve Component Identification (Section B-B) – 3KY Series A-1477/A-14167, Rev. 0 Page 10 of 37...
  • Page 11 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Figure 2-4 Valve Component Identification (Section A-A) – 3KY Series A-1477/A-14167, Rev. 0 Page 11 of 37...

  • Page 12: Valve Installation

    3 Valve Installation New valves are tested, adjusted and sealed at Midland. If a new valve has been left in its original packaging, is undamaged and is not more than six (6) months old, it may be installed on a tank car without retesting or recalibration.

  • Page 13: Leak Inspection

    Install the nuts and tighten them in 1/3-torque increments in a diagonally alternating sequence. Consult gasket manufacturer for recommended torque requirements. NOTICE: Consult gasket manufacturer and Midland Manufacturing for torque requirements as max torque may vary by valve model. Do not exceed 200 ft-lb.

  • Page 14: Valve Qualification

    Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4 Valve Qualification NOTICE: To ensure best practice and consistency of your qualification procedure, O-rings, gaskets and wire seals should always be replaced. Nuts, washers and studs must be closely inspected before re-use or replaced regularly. NOTICE Valve components such as the top guide, stem, retainer, body, plug, follower and spring must be thoroughly inspected.
  • Page 15 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Unscrew and remove the flue (tube) (item 28) from around the valve. Figure 4-2 Remove Flue (Tube) Place valve assembly in press to control the spring load for disassembly. Remove the four (x4) cap screws (item 16) connecting the top guide (item 1) to the body (item 4).
  • Page 16 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Remove cap (14) and top guide (item 1) assembly exposing the valve spring internal components for disassembly. Figure 4-4 Remove Cap and Top Guide Remove follower (6), spring (5), and guide (7). Figure 4-5 Remove Follower, Spring and Guide Remove stem (item 2).
  • Page 17 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Remove retainer (item 19) with O-ring (item 20). Remove O-ring (item 20). NOTICE: To ensure best practices and consistency of the qualification process O-rings should always be replaced. NOTICE TIP: Use a non-scratching tool to remove O-ring (item 20).
  • Page 18 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Remove the top gasket (item 9). NOTICE: To ensure best practices and consistency of the qualification process gaskets should always be replaced. NOTICE TIP: Use a non-scratching tool to remove gasket (item 9). Figure 4-12 Remove Top Gasket Secure the top guide (item 1) in a vise and loosen the top locknut (item 8).
  • Page 19 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Remove the stainless-steel ring (item 26). Remove the body insert (item 24). Figure 4-16 Remove Ring and Body Insert Remove the O-ring (item 27) from the body insert (item 24). NOTICE: To ensure best practices and consistency of the qualification process O-rings should always be replaced.

  • Page 20: Component Inspection

    Midland Manufacturing. Facilities performing these inspection methods must take steps necessary to ensure that their processes, training and personnel certifications are in compliance with accepted Non-Destructive Testing standards and practices.
  • Page 21 NOTICE NOTICE: Procedures may not cover all conditions encountered in the field. Therefore, it is the responsibility of the repair agency to obtain approval from Midland for inspection, evaluation, repair and maintenance procedures not covered herein. Evaluation of critical component metal surfaces of the valves after cleaning, inspection and specialized testing performed by agencies other than the repair facility are the responsibility of the repair facility.
  • Page 22 NOTICE: Valve-stem concentricity can be checked using a uni-level concentricity fixture and gauge (not supplied by Midland). For this or any other devices used to measure concentricity, refer to your company’s or to your specific instrument’s IOM for proper use instructions.
  • Page 23 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Spring Inspection The spring (item 5) is a highly stressed part. The exterior surface must be free of pitting, cracks and corrosion. If necessary, use magnetic-particle or dye-penetration inspection (performed by certified and trained personnel) to evaluate the exterior surface and ensure that it is free of cracks and corrosion pits.
  • Page 24 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Retainer Inspection Inspect O-Ring Visually inspect the retainer (item 19) paying close attention to sealing Grooves surfaces. It should be free of corrosion, nicks, dents, scratches and pits. Since the O-rings must seal against these surfaces, any irregularities can cause the valve to leak.
  • Page 25 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Valve Body Visually inspect the valve body (item 4) paying close attention to sealing surfaces and seat. It should be free of nicks, dents, scratches and pits. Since the O-rings must seal against these surfaces, any irregularities can cause the valve to leak.
  • Page 26 Special Inspection Considerations Previous procedures may not cover all conditions encountered in the field. Therefore, it is the responsibility of the repair agency to obtain approval from Midland for inspection, evaluation, repair and maintenance procedures not covered herein. Facilities performing recommended dye-penetration and magnetic-particle testing must carry out such testing accoording to a qualified procedure conducted by certified trained personnel.

  • Page 27: Valve Reassembly And Required Tools

    Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Valve Reassembly and Required Tools SAE Wrenches Component(s)/Description Item # 7/16” Socket Wrench Seat Screws 1-1/2” Wrench Top Locknut 3/4” Wrench Adjustment Screw 9/16” Socket Wrench Cap Screws 3/16”...
  • Page 28 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Install the O-ring (item 27), insert (item 24), and ring (item 26) to the body (4) using eight (x8) cap screws (item 25). TIP: Use a 3/4” Allen Wrench to install cap screws (item 25).
  • Page 29 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Insert the retainer (item 19) assembly into the body (item 4). Figure 4-36 Insert Plug Assembly Insert the shaft seal (item 10) into the seal retainer (item 12). Figure 4-37 Insert Shaft Seal Place the seal retainer (item 12) assembly onto the body (item 4).
  • Page 30 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Place the spring guide (item 7) onto the stem (item 2). Figure 4-40 Place Spring Guide Place the spring (item 5) onto the spring guide (item 7). Figure 4-41 Place Spring Insert the follower (item 6) onto the spring (item 5).
  • Page 31 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Screw the top locknut (item 8) onto the adjusting screw (item 11) by hand. Inspect the body to verify that the sealing surface is free of damage or debris. The threads of the adjuisting screw should be cleaned and lightly lubricated.

  • Page 32: Testing Process

    (STD is defined as a continuous discharge in contrast to the start-to-leak pressure, which is defined as the first bubble leak. Vapor-tight is defined as the pressure at whch no bubbles are detected. Midland NOTICE recommends that no bubbles be observed for two (2) minutes at vapor-tight.)
  • Page 33 4.4.3.6 Record the values. NOTICE: If the test results are erratic, troubleshooting is more complex. Consult your supervising engineer or a Midland Manufacturing representative. NOTICE 4.4.3.7 When the test results are acceptable, proceed to Post-Test Final Assembly in Section 4.6.

  • Page 34: Post-Test Final Assembly

    Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Post-Test Final Assembly After testing the valve, close the pressure inlet valve to the test chamber and vent the pressure in the test stand. Remove putty and drain water. Then remove the valve from the test fixture. Wipe or blow away any remaining soap suds and water used in the testing.
  • Page 35 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. Insert the seal screw (item 15). TIP: Use a 7/16” socket to tighten the seal screw. Figure 4-50 Insert Seal Screw Thread the seal wire (item 18) through the set screw and wiring point on the top guide (item1).

  • Page 36: Routine Maintenance

    Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 5 Routine Maintenance NOTICE: Maintenance, Scheduled Defined. Scheduled maintenance involves valve inspection and component replacement for valves in-service on tank cars, that is in accordance to the car owner’s standard qualification and maintenance program, that ensures the valve performs its intended function without failure until its next qualification or for its design life.
  • Page 37 © Copyright 2016, OPW. Printed in USA. © 2016 Delaware Capital Formation, Inc. All Rights Reserved.

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