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  • Users: stewbaby
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  1. stewbaby

    Asphalt PMAC (polymer modified asphalt cement) storage best practice - API RP 2023 withdrawn

    I work for a company that operates numerous bulk asphalt storage and paving grade production facilities. We've been using API RP 2023 (Guide for Safe Storage and Handling of Heated Petroleum...asphalt...) as a design guide...especially concerning pyrophoric iron sulfide deposit prevention...
  2. stewbaby

    Industrial ladder design in the wake of OSHA 1910.28 revisions

    It is my understanding that OSHA 1910.28(b)(9) will no longer accept cages as fall protection on new ladder installs in a little over a year from now. My typical ladder application is on small diameter 40' tall oil / asphalt storage tanks or refinery columns / towers. If I buy a tank tomorrow...
  3. stewbaby

    OSHA industrial guardrail requirement changes - 1910.29

    So as predicted in this old thread (thread507-352170), OSHA has changed the min height on industrial stair railing to 36" above tread? We'd been using 34". I just noticed the other day that OSHA had moved all guardrail requirements from 1910.23 to 1910.29...odd they re-purposed 1910.29 like...
  4. stewbaby

    Chemical soil stabilization legitimate - followup one plus year later

    To follow up on thread256-392364, we have been over a year since the chemical injection and coming up on 6 months since the first tanks were put in service. We have not had any differential settlement issues across the site. We did have residual water / chemical treatment to contend with when...
  5. stewbaby

    DCS or PLC emergency call out system

    We have a small asphalt terminal that uses hot oil for heating. Truck loading is controlled by a small DeltaV system that receives an exception alarm whenever a hot oil heater trips. We are wanting to add the ability to have a text sent to select personnel whenever a heater trips out. DeltaV...
  6. stewbaby

    Typical maximum shop storage tank size that can be shipped by truck?

    Know this question is a little open ended, but from a pracitcality / economical standpoint, what are we seeing typically for the maximum reasonable size of API650 shop built tanks? Seems like anything over 16' to 18' diameter would be getting beyond what a typical shop could handle or that a...
  7. stewbaby

    Crude storage tank w/ internal floating roof, radar stilling well design issue

    We have a crude storage tank with internal floating roof that was recently constructed with a stilling well for the radar. The stilling well was installed without slots along its length like a gauge pole has (it is just open near bottom of the tank and has a small vent hole near where it meets...
  8. stewbaby

    Chemical soil stabilization legitimate?

    We have a facility in the south central Texas area were we are looking to expand the tankfarm (add two additional tanks). The area has fat clays and the geotech report recommends overexcavating 11 feet to replace the fat clays. An expensive process given the tank size and spacing. In...
  9. stewbaby

    Loading arms for truck and rail car loading, what is being used

    Does anyone have any do's or don't, tips, trick, lessons learned on loading arms for open top truck and rail loading (lube oil and asphalt)? We have used a brudage torque arm worm gear operated loading arm for years and have loved its reliability and ease of use, but they were bought out by and...
  10. stewbaby

    Steam turbine power or "work" estimating

    I'm not very knowledgeable on steam and turbines, but have a question on steam turbine power estimating (if my "budget" number is attractive then I can call in an expert to detail engineer exact). Here is problem: We have a 650# boiler, saturated steam. Since our process doesn't need all the...
  11. stewbaby

    What happened to exchanger manufacture, A.M. Cuellar

    Sorry for posting a non-technical type question, but have a problem I'm hoping someone out there who buys / makes heat exchangers can help with. Our refinery runs 24/7/365 and any disruption is very costly in lost production. We have developed a leak in an exchanger that was made by A.M...
  12. stewbaby

    API versus ANSI centrifugal pump

    I've always struggled as to when to specify an API pump versus an ANSI pump. We have a small refinery and tank farm and except for the few hot and severe duty conditions inside the plant that an API pump is the obvious choice, I see no reason that ANSI shouldn't be used everywhere else. Does...
  13. stewbaby

    Filtration method for 10 micron range

    Having problem with prefiltering on our diesel coalescer system. The coalescer is used to remove gross water from the diesel to storage off a crude unit. The coalescer elements require protection from particulates larger than 10 micron so prefilter is required. Since bag filters have served...
  14. stewbaby

    Progressive Cavity for slop injection

    We have a new requirement to slowly inject our slop oil back into the Crude unit charge versus batch transfer to Crude tanks. We are temporarily using a hose pump (Watson-Marlow)to inject. Hose last about 2 months. Flow is varied by VFD from 2 to 10 GPM. Due to trash in slop oil, we do not...
  15. stewbaby

    TEMA Rho*V^2 number high

    Have an shell and tube AES heat exchanger in crude preheat that has high RHO*V^2 numbers on shell nozzles. Can someone help point me to the TEMA section / code that discusses this and its effects. I' like to replace the exchanger due to maintenance history and expected rate increase in the...
  16. stewbaby

    Field data collection to SAP

    Does anyone have experience w/ and recommend vendors for a field data collection system using PDA's. Invision steps being 1) scan barcode on pump 2) input run hours, flow, pressure into PDA 3) download into system for easy review of trends and excursions...perform preventive maintenance on...
  17. stewbaby

    Facility access control barrier placement

    Tightening up security at a petrochemical facility. We have heavy automated gates in place already, but are looking to prevent "gate crashers" (terrorist) from getting direct (straight path) access into the plant. There isn't enough room to re-align the entrance to slow vehicles down (county...
  18. stewbaby

    Large SS vessel passivation

    Anyone have experience with or contacts for passivating large vertical vessels, specifically a 6' ID x 110' T/T tall vessel with 321 SS overlay? Need to perform internal inspection and repairs without concern for stress corrosion formation caused by exposure to oxygen. Typically keep an N2...
  19. stewbaby

    Centrifugal Naphtha pump install design question

    Installing a small close coupled centrifugal pump (Goulds NPE 1ST) with single mech seal (John Crane Type 21) in a 5 - 10 GPM Naphtha injection service. (injecting into suction side of crude charge system , system is at 20 - 30 PSI, to provide additional light ends to cut gravity and help atm...
  20. stewbaby

    Low flow check valves

    What is the industry using for stopping backflow in low pressure piping systems such as flare and misc gas vent piping where pressure and velocity are to low for the average check valve? Specific vendors?

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