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  • Users: sshep
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  1. sshep

    Internal Projection on Level Nozzle of Steam Seperator Drum

    My Friends, A knock out drum on high pressure steam header has 3/4" internal projection on the level nozzles. These nozzles are for a bridle pipe that serves a dP level transmitter and a reflex level gage. The bottom (liquid) nozzle needs a repair and they asked permission to reinstall...
  2. sshep

    Non-Slam Style Check Valve

    My Friends, Is there a rule of thumb for when a non-slam type check valve should be considered? I just saw an incident notification where water hammer shattered the body of a 16" cooling water check valve (see attached picture). My project's big pumps for cooling water, fire water, ect are all...
  3. sshep

    Operating Hours for Plant Capacity

    My Friends, We were issued a plant design from the licensor which is based on 8000 hrs/yr. This low operating hrs has raised many questions because it implies a stream factor well below what is expected for this type plant, although the total annual capacity is exactly what is needed. Is there...
  4. sshep

    Lifting Levers on Steam Relief Valves

    My Friends, Recently I have talked with two operations people from different sites who tell me that they no longer allowed lifting levers in steam service, but were not sure why. Every site I have ever worked at generally provided lifting levers for steam relief valves to allow an opportunity...
  5. sshep

    Piping Isolation Component Nomenclature

    My Friends, I am working on a job in the USA with a team of people who have come from various other companies, countries, sites, etc. Recently there has been some confusion in the terminology people are using for various piping isolation components like: spectacle blinds, figure 8's, slip...
  6. sshep

    Melt Facility

    My Friends, I wish to provide a plant with a faclity to melt solid paraffin wax (need approx 180F) which is recovered from various plant operations. The heating medium should be steam (coil or jacket). I would like a facility which could easily process spill sized quantities (5 or 6 drums). The...
  7. sshep

    Flow Meter Valve on Tank Steam Heaters

    My Friends, I am working on the operations side of a new plant. The project team proposes to put steam flow meters on every steam tank heater as part of a TC-FC cascade. These are mixed tanks. The steam is to prevent freezing of the product, ranginging from 150F to 220F. The steam flow to the...
  8. sshep

    Full Vacuum vs Half Vacuum

    My Friends, I know that this subject has come up in forums several times, but my research of the site does not give a satisfactory explanation so I am posting the question again. Is there any API, ASME, or other documentation which rationalizes why a half vacuum rating would be sufficient for...
  9. sshep

    Rupture Disk under PSV on Vacuum Tower

    My Friends, I am in a P&ID review where some members of the team have suggested that PSV's protecting vacuum distillation towers should have a rupture disk to guard against the PSV (set at 51psig) leaking backwards from the flare into the process. As the operations engineer, I do not like to...
  10. sshep

    On-line Viscosity and Pour Point Measurements

    My Friends, A project that I am working on has product specifications on pour point, viscosity, viscosity index (which I understand is the ratio of visc at 100F and 40F). My previous experience has been dismal with respect to process measurements on product viscosity. The process is never at...
  11. sshep

    Environmental and Safety Considerations of Double Block and Bleed

    My Friends, A few days ago I was suprised to discover that most of my project's environmental technical staff did not realize that the use of automated double block and bleed (to atmospheric "safe location") systems was normal on fired heater fuel gas trip and interlock logic. This...
  12. sshep

    Heated Hose

    My friends, I need a solution to transfer wax with a melt point of up to 90C when draining equipment into a heat traced slop header. We don't want to hard pipe every point that might need to be drained (such as control valve stations, pumps, etc). Does anyone have experience with steam jacketed...
  13. sshep

    Fire Protection Spray Rings

    My Friends, I was advised to repost my question in this forum. We are building some new plants in the USA Gulf Coast which will require many tanks of all sizes. I am asked to get some information to use as guidence on the use of external spray fixed fire protection. In some newer plants I have...
  14. sshep

    Fire Protection Spray Rings on Tanks

    My Friends, We are building some new plants in the USA Gulf Coast which will require many tanks of all sizes. I am asked to get some information to use as guidence on the use of spray rings as fixed fire protection. In some newer plants I have worked on elsewhere, the local site standard...
  15. sshep

    Standard Pump Piping Layout especially Min Flow Lines

    My Friends, I am looking for an industrial standard (hopefully API) for standard piping layout around pumps, especially the minimum flow lines. In virtually every plant I have ever worked in, each pump (including spare) at a distillation tower bottoms (for example) has its own minimum flow...
  16. sshep

    Safe Handling of Ethylene Reference

    My Friends, 20+ years ago following an ethylene decomposition incident on one of my early projects, I saw the effects of ethylene decomposition which started in a steam heater, which made its way back into the unit melting the foam glass off the piping as it progressed. After this happened I...
  17. sshep

    Elevated steam trap

    My friends, We would like to run a 350 psig steam line under a road which is basically level grade. It could be fully encased or in a bored sleeve with pits at each end, that is not yet decided. I would like to have traps which are at grade. This means a line or syphon from the boot running up...
  18. sshep

    Manual Valve Closing Times

    My Friends, I am working on a project which has many large gear operated valves. Is there any standard or reference on how long it takes to open valves of different sizes and types, standard gearing ratios, etc? Any help is appreciated. best wishes, sshep
  19. sshep

    Safety Shower and Eyewash Philosophy

    My Friends, We are building a multiple unit chemical complex. I am working on the facilities team which is handling the common systems, including the potable water and safety showers/eye baths. We have two different designs from two different units. The first design is simply a distribution to...
  20. sshep

    Drying an Internal Floating Roof Tank

    My Friends, We are commissioning internal pontoon type floating roof tanks for new products. The moisture specification is crucial, typically we shoot for -50F dewpoint in railcars and vessels for these products (1-octene, 1-hexene, etc). We are trying to keep from generating alot of off-spec...

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