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  • Users: RobsVette
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  1. RobsVette

    Sea Water / Salt Water Piping Application

    Good Afternoon, Im relatively new to heat exchanger piping and vessels that stand up well to salt water service and was hoping someone could provide some guidance on the difference between super duplex stainless steel (2507) vs titanium for piping and heat exchanger tubes. The pressures are...
  2. RobsVette

    B31.3 and Section IX - Impact Testing Procedure Qualification Position

    Hello Everyone, I am looking to gain some understanding of the requirements that recently changed regards to position of which to perform a PQR coupon for a weld procedure that requirements impact testing. My understanding of Section IX changes is as follows. - Prior to 2019 code - impact...
  3. RobsVette

    B31.12 - Mf Factor for Stainless Steel Piping

    Good Afternoon, We are working with some piping that will be containing Hydrogen at 2400 psi. The piping will be 316 stainless steel. We dont see any clear direction in the code text as to what value to use for Mf for stainless steel. Table IX-5C contains values for low and intermediate alloy...
  4. RobsVette

    Chiller Motor - FLA, MCA and Circuit Breaker Size

    Good Morning everyone, I hope everyone had a nice weekend. I haven't had to do a motor cable specification in quite some time, so just looking to make sure I am not to rusty. I have a Chiller motor with an FLA of 1045 amps and a MCA of 1306. Because the MCA is 1306 amps, I will have to...
  5. RobsVette

    Cryogenic Welding Procedures and Impact Test Requirements per B31.1

    Good Evening Everyone, I am embarking upon my first attempt at making welding procedures for cryogenic service piping down to -320F in accordance with b31.3. I have never done this before and would appreciate some guidance on how to conduct the charpy impact test. The piping to be welded is...
  6. RobsVette

    Using Weld O Lets with a Section VIII Div I Pressure Vessel

    Good Evening, I am looking to do some very basic calculations that involve making a pressure vessel (24" OD with caps on each end) and want to use Weld O lets for the nozzle connections. I have reviewed Section VIII div I and cannot seem to track down how to handle these connections...
  7. RobsVette

    Low Power Factor Motors and VFD

    Greetings everyone, I recently came across a very interesting problem. We have a motor with the following characteristics. - 75 HP TEFC - 900 RPM - 460V - Nameplate amps @ 460V - 111amps, with 1.15 SF - In. Class - F - Efficiency - 94.5% - Power Factor - .68 This motor is paired to a VFD...
  8. RobsVette

    Welding 304SS to P91

    Greetings everyone, I am looking to make a WPS and PQR to weld 304 stainless steel to P91. Before I embark on this process I was hoping to get some feedback and input from forum members who have experience in with these metals. I have just read Replicas thread on the subject and not wanting to...
  9. RobsVette

    Allowable Stress Values for ASME Section II Part D

    Hi Everyone, This is probably a relatively simple question, but its one I do not know the answer to. I am looking at performing design calculation using SA-395 which is a nodular cast iron and does have a section in section II part a. I cannot however track down allowable stress values to use...
  10. RobsVette

    Siemens Demand Flow Chiller Plant Optimization Software

    Does anyone have any experience with Siemens Demand Flow? I am only recently starting to hear about this and from what I can gather thus far, it sounds like head pressure control on steroids. On many recent projects, I have worked on we implement variable condenser water flow (based on reducing...
  11. RobsVette

    2 questions because I think I'm losing my mind - Equalization Line - Refrig. Exhaust Leak Ductwork

    Hi Everyone, So the Manhattan HVAC industry is really amazing and you definitely get to hear some wild stuff. Here are 2 of recent that, i argued and was told neither of of these items are needed. - Cooling Tower Equalization Line - I was told this is not needed because the supply line has...
  12. RobsVette

    Post Weld Heat Treatment of a stainless steel to carbon steel weldment

    Hi Guys, Looking for some help here. We have a situation involving a deaerator that I would like some assistance with. We are instructed to run a stainless steel vent through a carbon steel shell that is 1" thick. Given that this is a deaerator, we will have to stress relieve the weld to...
  13. RobsVette

    Vertical Inline Pump vs Horizontal Split Case vs Vertically Mounted Horizontal Split Case

    Hi Guys, I was hoping some of the experts here can educate me on some practices I follow but dont know the specific reasons why. As the title states I have some questions on the different kinds of centrifugal pumps, specifically in regards to inertia bases and inertia bases using a VFD. Here...
  14. RobsVette

    Mag Lev Chiller Part Load Efficiency

    Lately I have seen quite a big deal made about the magnetic levitation chillers and there excellent part load capability. I am wondering if anyone can explain how they generate such efficiency at part load. As I am sure everyone is familiar with by now, a high pressure centrifugal with a VFD...
  15. RobsVette

    Relief Valve Exhaust Piping for different operating pressure lines

    Hi Guys, I am having an arguement with someone here in our office and have a question regarding best practice for steam relief valve discharge piping connections. The question is "can discharge piping from relief valves of different operating pressure steam lines, for instance 150 psig medium...
  16. RobsVette

    LM6000, LMS100 vs Rolls Royce Trent 60

    Hi Guys, I recently went to tour a simple cycle gas turbine plant that utilized at Rolls Royce Trent 60 gas turbine engine. It seems to be a very nice and compact package. I was wondering if anyone has a specific experience with the Trent 60 and can share some comparisons as to the standard...
  17. RobsVette

    Utility Plant Transformer configuration for Backfeeds

    Hi Guys, Here in NYC I am working on a cogen project for a college and the topic of power export to the utility came up. The concept that was mentioned was to export power to the utility via existing feeders into a large campus substation, via existing transformers, just with power flowing in...
  18. RobsVette

    Need Help with a Condenser Water System that is short on flow

    Hi guys, I am looking for some pump specific advice on a condenser water system that we recently installed at a hospital here in NYC. The system consists of 2 Marley NC8411 cooling towers to cool the condensers of 2 chillers up on the roof of a hospital. The entire system is relegated to the...
  19. RobsVette

    Chilled Water System Hammering - Air Trapped

    Hi Guys, I am working at a hospital in NYC and we had a contractor install some 10" chilled water pipe for us. The pipe ran through some closets and high ceilings so I personally never actually looked at the run. Today we started up a 125hp chilled water pump and the system was hammering...
  20. RobsVette

    Step Up Transformer Inrush Current Problem

    Hi Guys, Looking for some help with a situation going on at a project now. We are installing some new cooling equipment at an older hospital here in NYC. The services for the hospital are currently all 208V. So the original plan from the engineer, was to tie the new transformer into an...

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