Table of Contents
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Table of Contents
Related Manuals for Midland A-1075
Summary of Contents for Midland A-1075
- Page 1 P/N: A-1000, Rev. 3.2 Issue Date: April 10, 2018 Supersedes: A-1000, Rev. 3.1 Internal-Style Pressure Relief Valve A-1000 Series Installation, Operation & Maintenance (IOM) Manual Manual content is subject to change. Visit www.midlandmfg.com for latest manual revision and revision history.
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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 ............................. 6 Valve Details – Tongue-and-Groove Series ................6 Valve Details –... -
Page 3: Regulations And Safety Requirements
1 Regulations and Safety Requirements 1.1 Regulations Midland internal-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: 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. CAUTION CAUTION: Valve/Seat Damage.
- Page 5 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. CAUTION: Field Repair. The repair procedure for leaking valves in the field is intended only as a temporary repair to get the car to an unloading destination. Once the product is unloaded and pressure is relieved, the valve should be removed for a complete inspection and requalification.
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Page 6: Introduction
Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 2 Introduction The A-1000 Series Internal-Style Pressure Relief Valve provides flow rates suitable for commodities requiring relatively low flow rates, ranging from 1,109 to 4,705 standard cubic feet per minute (scfm). 2.1 Valve Details –... - Page 7 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. A-1075 THRU A-1450 STAINLESS TRIM A-1079 THRU A-1379 STAINLESS STEEL ITEM QTY. PART NAME MATERIAL PART NO. MATERIAL PART NO. TOP GUIDE STEEL W/SS INSERT...
- Page 8 4322 10-300-AS 12-330-SS A-1375 4220 10-375-AS 12-375-SS A-1450 4705 10-450-AS 12-450-SS Table 2-3 A-1075 Thru A-1450 Stainless-Steel Trim Model Specifications – Tongue-and-Groove Series A-1079 THRU A-1379 STAINLESS-STEEL VALVE PART NO. PRESSURE SETTING FLOW RATE SPRING NAMEPLATE (PSIG) (SCFM-AIR) PART NO.
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Page 9: Valve Details - Flat-Face Series
Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 2.2 Valve Details – Flat-Face Series ITEM QTY. PART NAME TOP GUIDE STEM RETAINER BODY SPRING FOLLOWER SPRING GUIDE TUBE TOP LOCKNUT WASHER SEAT O-RING STEM O-RING ADJUSTMENT NUT LOCKNUT... - Page 10 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. A-1079-F THRU A-1379-F STAINLESS A-1075-F THRU A-1450-F STAINLESS TRIM STEEL ITEM QTY. PART NAME MATERIAL PART NO. MATERIAL PART NO. TOP GUIDE STEEL W/SS INSERT...
- Page 11 4322 10-300-AS 12-330-SS A-1375-F 4220 10-375-AS 12-375-SS A-1450-F 4705 10-450-AS 12-450-SS Table 2-7 A-1075-F Thru A-1450-F Stainless-Steel Trim Model Specifications – Flat-Face Series A-1079-F THRU A-1379-F STAINLESS-STEEL VALVE PART NO. PRESSURE SETTING FLOW RATE SPRING NAMEPLATE (PSIG) (SCFM-AIR) PART NO.
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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 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 3.1.5 For tongue-and-groove mountings, examine the sides of the groove. The valve tongue fits tightly into the groove, any peening-over of the edges of the groove may make it difficult to properly fit the valve tongue into the groove.
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Page 14: Leak Inspection
Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 3.2 Leak Inspection 3.2.1 Test all newly installed valves to conform to car-owner specifications. No leaks should be present. WARNING: Valve Leakage. Improper valve-tongue seating in the flange groove, loose nuts and damaged gaskets may result in leaks at the valve-mounting joint. -
Page 15: 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. For your convenience, OEM hardware repair kits and O-rings are available (see Appendix A). - Page 16 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4.1.1 Remove the seal wires (item 16) from the top-guide studs (items 14 and 14A). Figure 4-1 Remove Wire Seal 4.1.2 Remove the four (4) nuts (item 15) securing the top guide (item 1) to the valve body (item 4).
- Page 17 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4.1.5 Loosen the top locknut (item 8) with a wrench on the stem (item 2) while holding the retainer in place (item 3) with another wrench. TIP: •...
- Page 18 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4.1.9 Clean and lubricate the stem thread. Inspect threads for any sign of excessive wear, corrosion, pitting or other defects. If any are found, the part is rejectable and should be replaced.
- Page 19 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4.1.12 Using a press yoke having a cutaway as shown, compress the valve spring enough to allow removal of the adjustment nut (item 12) while taking care to support the valve stem.
- Page 20 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4.1.16 Remove the spring follower (item 6). Figure 4-14 Remove Spring Follower 4.1.17 Remove the valve spring (item 5) from the guide tube. Figure 4-15 Remove Spring 4.1.18 Remove the valve stem (item 2) .
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Page 21: Component Inspection
O-Rings, gaskets and wire seals must always be replaced during this step. Midland suggests that nuts, washers and studs be regularly replaced during the qualification process. Midland provides Repair Kits for this purpose (see Appendix A for repair kits and O-ring options.) A-1000, Rev. - Page 22 WARNING NOTICE: Valve stems of this Midland series are machined from raw forgings. In cutting forging stock to length, the end of the bar may contain surfaces imperfections caused by the cutting tool. The end imperfections may be retained on a finished part and potentially provide false indications when using a magnetic particle or flourescent penetrant inspection.
- Page 23 NOTICE: Total valve-stem runout can be checked using a uni-level concentricity fixture and gauge (not supplied by Midland). For this or any other devices used to measure runout, refer to your company’s or to your specific instrument’s IOM for proper use instructions.
- Page 24 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. WARNING: Machining Not Allowed. Without the consent of the manufacturer or car owner, machining, grinding, welding or other alterations to the valve seat or stem seat is not allowed per AAR M1002, Paragraph A3.11.1 of the Tank-Car Specifications.
- Page 25 For Aluminum-Clad Springs: Aluminum-clad springs cannot be inspected by magnetic-particle or dye-penetration methods. No peeling or flaking of the aluminum coating is permissible. If such defects exist, contact Midland for repair or replacement. It is typically more cost-effective to replace a spring Figure 4-23 Spring Inspection having damaged aluminum cladding rather than re-cladding the spring.
- Page 26 An O-ring that fits loosely in the cap, or can only be pushed into the O-ring retainer with difficulty, is quite likely not the correct size. Many of Midland’s O-rings are made on special molds to non-standard Figure 4-26 Elastomer Inspection sizes and are obtainable only from Midland.
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Page 27: Valve Reassembly And Required Tools
Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4.3 Valve Reassembly and Recommended Tools SAE Wrench Component(s)/Description Item # Torque (ft-lb) 3/4” Nuts for Top Guide (x4) –– 15/16” Locknut for Spring Adjustment 85 - 95 15/16”... - Page 28 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4.3.4 Insert the stem assembly into the top guide (item 1). Figure 4-30 Assemble Top Guide and Stem Assembly 4.3.5 Mate the top guide (item 1) and the body (item 4), aligning holes with the studs.
- Page 29 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4.3.8 Place the spring follower (item 6) onto the stem (item 2) of the stem, spring, and spring guide assembly. 4.3.9 Manually install the stem adjustment nut (item 12) to hold the follower to the stem (item 2).
- Page 30 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4.3.14 Screw the top locknut (item 8) onto the stem (item 2). Figure 4-37 Install Top Locknut 4.3.15 While holding the retainer (item 3), tighten the top locknut (8) using a torque wrench calibrated to ft-lb.
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Page 31: 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 32 4.4.3.5 Record the values. NOTICE: If the test results are erratic, troubleshooting is more complex. Consult your supervising engineer or a Midland Manufacturing representative. NOTICE 4.4.3.6 When the test results are acceptable, tighten the bottom locknut (item 13) to torque at 85–95 ft-lb.
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Page 33: Valve-Setting Adjustment Procedure
Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4.5 Valve-Setting Adjustment Procedure If your company has an approved test procedure, follow it. If it does not, these procedures provide essential guidelines regarding pressure testing. 4.5.1 Remove the wire seal (item 16) from the spring adjustment nut, if required. - Page 34 STD tolerance range. Refer to Table 4-2 Start-To-Discharge (STD) and Vapor-Tight Pressure (VTP) Settings 4.5.8 If the test results are erratic, troubleshooting is more complex. Consult your supervising engineer or a Midland representative. 4.5.9 When the test results are acceptable, tighten the locknut (item 13) to torque at 85–95 ft-lb.
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Page 35: Post-Test Procedure
Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 4.6 Post-Test Procedure 4.6.1 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. 4.6.2 Wipe or blow away any remaining soap suds and water used in the testing. -
Page 36: Routine Maintenance
No regular, periodic maintenance of the mechanical workings of this valve is required outside of regular standard qualification. However, Midland recommends that the installed valve be inspected on a regular basis to ensure that the tamper wire and weather cap are in place and that the external visible valve body is free of any foreign materials that could impact its intended operation. - Page 37 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 5.1.2 Then, remove the four (4) top guide nuts (items 15) and store them so they won’t be dropped or lost. TIP: Use a 3/4” wrench to remove the top guide nuts (item 15). Figure 5-2 Remove Bolts and Set Aside 5.1.3...
- Page 38 Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 5.1.5 Replace the retainer (item 3). Figure 5-5 Replace Retainer 5.1.6 Insert (2) O-rings (items 10 and 11) into the retainer (item 3). Figure 5-6 Insert O-Rings 5.1.7 Place the retainer (item 3) with the seat O-ring assembly onto the stem (item 2) so that it rests squarely on the valve assembly.
- Page 39 CAUTION: Do not look directly down into the the valve, debris may discharge upwards. CAUTION NOTICE: If the test results are erratic, troubleshooting is more complex. Consult your surpervising engineer or a Midland Maufacturing representative. NOTICE A-1000, Rev. 3.2 Page 39 of 42...
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Page 40: Emergency Response For Leaking Valve
Manual content is subject to change. Visit midlandmfg.com for latest manual revision and revision history. 6 Emergency Response for Leaking Valve NOTICE: Emergency Response is the temporary remediation to a valve observed to be emitting product in an unintended manner. It is possible to replace o-rings on an internal style valve installed on a pressurized tank car. -
Page 41: Appendix A Elastomer Options
Neoprene Food-Grade ® Viton Viton ® ® Viton VGFS Viton ® WBNFG White Buna ® -N Food-Grade WNEFG White Neoprene Food-Grade Table A-1 O-Ring Options Contact Midland Manufacturing at 1-847-644-0333 for all available O-rings. A-1000, Rev. 3.2 Page 41 of 42... - Page 42 © Copyright 2017, OPW. Printed in USA. © 2017 Delaware Capital Formation, Inc. All Rights Reserved.