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  1. RRE

    Valve Leakage Rates While Staying Online

    Valve vendors specify the leakage rates for their products using ANSI standard FCI 70-2. This spec is used to determine what the Control Valve Seat Leakage is based on valve classes. The leakage rates measured in ml/min or bubbles/min an be found in the table. The higher the valve Class, the...
  2. RRE

    Mesh Pads and Location of PSV

    In a previous, now closed post (thread 1203-257564), the question was asked about the location of the PSV when a vessel contains a mesh pad. Although guidance was provided by several that posted, the guidance (or better yet), the regulatory requirement given in ASME Section VIII D1 was NOT...
  3. RRE

    PSV Location in Vessels with Mesh Pads

    In previous post (#) the question was asked about location of the PSV when a vessel contains a mesh pad. Although guidance was provided by several, the guidance (or better yet, the regulatory requirement given in ASME Section VIII D1 was not quoted. UG-35 discusses this requirement and states...
  4. RRE

    Restriction Orifice Use & Restriction

    With the exception of a PSV downstream, is there any other application where a restriction orifice should NOT be used?? I am refering mostly to code restrictions, although best practices would also be of interest. My service is in the oil and gas business only.
  5. RRE

    Natural Gas Liquid (NGL) Storage Industry Codes

    What is a spec (API or other) that would define the requirements to satisfy REGAGEP (recognized and generally accepted good engineering practices) for natural gas liquid storage (NGL)? I am aware of a spec such as API 2510 (Design and Construction of LPG Installations) that is good guidance for...
  6. RRE

    Propane Storage Specs - API 2510 vs NFPA 58

    thread184-114563 provides the framework for my question. It appears that each code applies to two distinct services for delaing with LPG (processing plant vs LP gas systems). In my application, I am dealing with a gas plant that stores propane used for refrigeration. According to the scope in...
  7. RRE

    Distillation Tower Hydraulics: Low L/V

    A proposal has been made in a gas sweetening application using a very low L/V ratio, at 0.217. That is an 70" ID amine contactor is being proposed to treat 115 mmscfd of gas using a 25 gpm amine rate. This is the lowest L/V I have ever seen and I'm very concerned that the internals (packing)...
  8. RRE

    API RP 2003 Static Electricity and Production Tanks

    We operate many metal, production tanks when we produce from a well. These tanks will contain condensate (oil) that is often trucked out from a facility (E&P Operations). We are looking to prevent potential incidents caused by static buildup (we know it is not lightning in many cases) and...
  9. RRE

    PSV Bypass Valves (in Cryogenic Service)

    In my plant design, we have full flow bypass valves around PSVs in a cryogenic hydrocarbon stream. Each PSV has two CSO valves that are closed when servicing the valve (inlet and outlet). Full flow gate bypass valve has been designed around every PSV valve. The release from these valves (PSV and...
  10. RRE

    Steam Relief Valve Discharge Piping Design

    I have a steam relief valve that failed when the inlet piping to the valve cracked. The mechanism is being investigated. Can you provide me a reference (API like code) where I can find how the discharge piping of a steam relief valve needs to be designed? The vent piping was supported.
  11. RRE

    Steam Relief Valve Vent Design

    I am looking for a design reference that would enlighten me on the proper design of a steam relief valve vent (discharge) piping. A failure resulted in the inlet piping to a steam relief valve. The valve had a sizeable vent pipe that was supported. The weight (forces) of that vent pipe is coming...
  12. RRE

    Fiberglass Tank in Hydrocarbon Service

    Would appreciate a steer on the use of fiberglass storage tanks in natural gas service. Background: we produce natural gas, oil condensate (light oils of API gravity 50-70), and lots of produced water. Typically, the gas patch industry uses steel tanks to store the separated oil condensate in...
  13. RRE

    API 12P: Fiberglass Tank Service

    Would appreciate a steer on the use of fiberglass storage tanks in natural gas service. Background: we produce natural gas, oil condensate (light oils of API gravity 50-70), and lots of produced water. Typically, the gas patch industry uses steel tanks to store the separated oil condensate in...
  14. RRE

    Combustion Temps of BTEXs

    This was also posted in the forum for Chemical Processing Engineering (perhaps by mistake): A colleague is installing a combustion burner to combust BTEXs from a TEG glycol still. The burner has a 400F shutoff temp. For some reason, 400F seems to be low to totally combust BTEXs from htis...
  15. RRE

    Combustion Temperatures of BTEXs

    A colleague is looking at installing a combustion burner to burn the BTEXs (benzene, toulene, ethylbenzene, and xylenes) from a TEG glycol still. The combustion device has a 400F temp shutoff. For some reason, this temp seems low to totally combust BTEXs. (The project team prefers combustion...
  16. RRE

    Amine Service Exchanger Tube Spec

    What spec do you recommend for heat exchanger tubes in amine service? Do you have shared learnings around the use of seamless CS, welded (ERW = electric resistance welded) CS vs SS tubes in amine service? What has been your experience (if any) with ERW CS failures in amines? What do you...
  17. RRE

    GAs Tap Piping and Piping Spec

    Can you steer me to the proper standard or specification that defines what metallurgy to use for gas taps. I am referring to supplying gas to royalty owners (domestic users). I've reviewed ASME B31.8 section 849 (Gas Service Lines) and find some words that would indicate the metallurgy...
  18. RRE

    Separator Efficiency

    I was asked recently to provide a % efficiency value for a wellsite separator (operating in natural gas, some oil and produced water service). I provided a value of ~90%. I understand that if you use well designed mesh pads, vanes, or other internals (cyclonic, etc) the efficiency is much higher...
  19. RRE

    Pipeline Depressuring Procedures

    Interested in shared learnings or places to find (resources) on how to deal with pipelines that are under pressure with natural gas that will need to be depressured to determine/inspect line strike impacts would be apprecaited. Some of these lines may also contain % levels of H2S.
  20. RRE

    CS2 Distribution in Natural Gas

    Any leads where I can find the distribution of sulfur species, more specifically of carbon disulfide (CS2) in natural gas?? Interested in knowing if there's data (perhaps through GPA) that would show the content of H2S, mercaptans, COS, and CS2 being fed to a sweetening process when the H2S is...

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