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  1. JAlton

    Does dry gas PSV always need drainage on discharge pipe ?

    Per ASME Code, Sec XIII, Part 3, for UV Designated Pressure Relief Valves: 3.2.2 Drains (a) If the design of a pressure relief valve is such that liquid can collect on the discharge side of the disk, then, except as permitted in (b), the valve shall be equipped with a drain at the lowest point...
  2. JAlton

    Set presure tolerance for PSVs- ASME Section 8, UG-134 D

    Its is for Fire Sizing, This is for use in addition to the PRV set for typical overpressure protection. JAC
  3. JAlton

    Test media for testing of PSV installed in gas service

    2-3 TYPES OF DEVICES 2-3.l Reclosing Pressure-Relieving Devices pressure relief valve {PRV): a pressure relief device designed to actuate on inlet static pressure and reclose after normal conditions have been restored. It may be one of the following types and have one or more of the following...
  4. JAlton

    Test media for testing of PSV installed in gas service

    National Board Inspection Code, Part 4, Sec. 4.6.1 TEST MEDIUM AND TESTING EQUIPMENT Valves marked for steam service, or having special internal parts for steam service, shall be tested on steam. Valves marked for air, gas, or vapor service shall be tested with air or gas. Valves marked for...
  5. JAlton

    PSV ON SITE testing

    NBIC compliance is mandatory if the Jurisdiction (USA States, Canadian Provinces, a few USA Cities) has adopted NBIC. You can check this on the National Board Website nationalboard.org. Under "Resources" Tab, select NB-370 and enter a Jurisdiction. There are many exceptions. Texas has a boiler...
  6. JAlton

    PSV ON SITE testing

    PRV Testing prior to installation is NOT a requirement of any Code or Standard that I am aware of. The ASME Code Stamp and Manufacturer or Assembler Seals indicate the PRV has already been tested. In-Service Inspection per National Board Inspection Code is a requirement of "Code" States, refer...
  7. JAlton

    NEED ADVICE, PLEASE: BACKGROUND:

    NEED ADVICE, PLEASE: BACKGROUND: Low temperature carbon steel castings LCB and LCC acc. to ASTM A 352 are typically supplied in the “quenched and tempered” heat treatment condition in order to meet the impact test requirements at-46°C. However “quenched and tempered” is not one of the above...
  8. JAlton

    [ASME CODE REQUIREMENT]

    There is NO ASME Requirement for an Open Bonnet PRV on Air, just a lifting Lever. The Bonnet (open or enclosed) houses the spring. Per ASME Section VIII, Division 1, Paragraph UG-136(a)(3), "Each pressure relief valve on air, water at the valve inlet that exceeds 140°F (60°C), excluding...
  9. JAlton

    PRV ASME I Valves

    Excerpt from the ENGINEERING HANDBOOK, page 4.7, Next to Figure 4-8, "The guide ring position determines the blowdown setting. The lower the guide ring position, the higher the opening force delivered by the flowing steam. This causes an increase in the blowdown. In order to decrease the...
  10. JAlton

    PRV ASME I Valves

    To which "Book" are you referring? Is it a PRV Manufacturer's Instruction? JAC
  11. JAlton

    Best practice document

    My experience is primarily in the maintenance side, so I will only address that aspect. The PRV Manufacturers have Installation and Maintenance Manuals available on their websites. I recommend you take advantage of them. Several Manufacturers have seminars available as well. I teach classes...
  12. JAlton

    PRV ASME I Valves

    I have been Testing ASME Section I Safety Valves for 46 years. Consolidated (1811 & 1700 series), Kunkle (300 & 6000) series, Crosby (HS,HSA, HC, HE etc.). All are two ring design Safety Valves. I can tell you from experience, unequivocally, lowering the upper ring does NOT decrease the...
  13. JAlton

    PRV Set Pressure

    Based on 44 years of Pressure Relief Valve Assembly, Repair and Testing, including 20 years as a member of ASME Sub-Committee Safety Valve Requirements, Past Chair of Sub-Group Testing and PTC25, as well as Vice Chair of the National Board Sub-Committee Pressure Relief Devices, I can tell you...
  14. JAlton

    NITROGEN USE DURING PRV TESTING

    I am using a 2200 psi DOT Bottle to fill a 3 cubic foot, 3000 psi, Test Vessel. The bottle has 230 cubic feet of nitrogen. How many times can I fill the 3 cubic foot vessel before the DOT bottle is empty? Seems it would depend on the PRV Set Pressure? If so, 125 psi, 650 psi and 1440 psi are...
  15. JAlton

    Can the same PSV be used in water and nitrogen

    CAUTION: When PRVs certified for Steam. Air & Liquid are assembled, there is a Spring Selection Process. Spring Charts for Liquid Service PRVs are not the same as Spring Charts for Air/Gas. To be specific, a Farris 27DA23-M20 Set for 100 psi Air would use a #C3033 with a range of 100-121 psi...
  16. JAlton

    Perfomance Testing on a 19000 PRV

    Based on the end view of the Test Bench, I would say that you have an Energy Equipment Bench built buy my old friend, the late Mr. Larry Lane, or a very good copy of his design. Larry was a top hand on PRVs for many years. When I built PRV Test Equipment, he was my toughest competitor. It's a...
  17. JAlton

    Can a PSV have different flange rating?

    The typically lower rated outlet (there are PSVs with 150# inlet and 150# outlet) is also a factor in the relatively recent ASME Pressure Testing requirements for the components of the PSV Shell. Shell is a new term in ASME with respect to PSVs. It refers to the Body, Bonnet & Cap in most...
  18. JAlton

    Perfomance Testing on a 19000 PRV

    Looking at your Test Results, 1100 psi, 1127 psi & 1118 psi, you have a PRV that is in Tolerance for the CDTP with no trending up or down. The set pressure is established and within 0.7% of Stabilized. I would not be too concerned. I recommend that you do one more test. If it is higher than...
  19. JAlton

    Inline Test Method

    Sorry about the attachment. I converted it to a PDF. Hope this works. JAChttp://files.engineering.com/getfile.aspx?folder=8279d07b-86a4-4072-9f3d-7f6d3b356588&file=6K_PSI_N2_TEST_BENCH_OGVS_2016.pdf
  20. JAlton

    Inline Test Method

    ASME SEC VIII, Div 1, Non-Mandatory Appendix M, describes the procedure for installation and use of Isolation Valves underneath a PSV. You could use a Rupture Disc, if rated as you described. A Bleed Ring is the best connection method. I do not care for the Nozzle Tap connection, I just...

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