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  1. curtis2004

    1/2" Relief Valve Crane 2604

    LitteInch, Thank you for your responses. When we have back-pressure regulator installed at rotary pump discharge, can there be isolation valve or check valve between pump discharge and back-pressure regulator? Thanks,
  2. curtis2004

    1/2" Relief Valve Crane 2604

    Hi there, I have attached Kunkle datasheet. We have four identical systems. Why three of them have 50 psig pump pressure and only one has 60 psig? Relief valve is by-passing in that case, I guess? Thanks...
  3. curtis2004

    1/2" Relief Valve Crane 2604

    Gentlemen, I have the following concerns. There are four units in the plant. All units have a pair of the same rotary pumps. I have checked pump motor and based on pump datasheets we should have 19 USGPM @ 50 psig flow. One unit have 1/2" Crane RVs. Three other units have 1" Kunkle...
  4. curtis2004

    1/2" Relief Valve Crane 2604

    Hi Everyone, Thank you for all of your inputs. I agree, it belongs to a museum! It looks so beautiful and rear and it doesn't even have a nameplate. This valve is installed in discharge side of rotary pump with 10 usgpm capacity in lube oil system. There is an isolation valve between the pump...
  5. curtis2004

    1/2" Relief Valve Crane 2604

    Hello Everyone, I am writing this post to find out product data sheet for 1/2" Crane 2604 relief valve. I came across this valve installed in low pressure lube oil system and would like to know its relieving capacity. Based on drawing, it was installed in 1953. Couldn't find anything on the...
  6. curtis2004

    Criteria for hot-torqueing in a plant that cycles very frequently

    Hi Everyone, I have glanced to ASME B16.5-2013 (I don't have a copy of latest editions) pressure-temperature tables and found out the following: 1. Group 1.1 materials table ends at 1,000 F and recommended not to be used above 800F almost for all materials. Only Class 1500 @ 1,000F rating (430...
  7. curtis2004

    ASME B31.1 102.2.4 Ratings: Allowance for Variation From Normal Operation.

    Hi BCD, Thanks for your answer and correction. Yes, I had older version (2004) of B16.34. I found newer version (2017) which is a bit different. I understand and appreciate that with gate valve open, piping system can be tested to 1.5 x the class rating. It sounds like ASME B31.1 para 102.2.4...
  8. curtis2004

    ASME B31.1 102.2.4 Ratings: Allowance for Variation From Normal Operation.

    Hello Everyone, I am trying to determine design pressure of penstock in hydro power plant. Currently there are mix of Class 300, 400, and 600 valves are used as drain valve for different equipment close to the bottom of the penstock. The elevation change from maximum elevation of reservoir...
  9. curtis2004

    ASME B31.1 - BOILER EXTERNAL PIPING - VALVES IN HYDROSTATIC TEST

    Obzekator, BEP is considered as a part of Boiler and shall be hydrotested together with a boiler, up to the second isolation valve per BPVC Section I and B31.1 provisions. Thanks, Curtis
  10. curtis2004

    Long Water Service

    Hi Builder604, 1 1/2" should work fine for your house with 5 bathrooms. If you use HDPE rolled pipe, it probably not much difference for the cost difference between 1 1/2" and 2". If in future you decide to split your land and build a second (third or even more houses), it could be better to...
  11. curtis2004

    Pressure Drop on EXPANSION BELLOWS for Steam Line

    Hi RomeoMC, Yes, you have to ask expansion joint supplier. I think, it will be almost the same or close to 4 elbows expansion loops. Usually, in a long run, you do not save anything by installing expansion joints. It is because no matter what you do, they all leak and need replacements. On a...
  12. curtis2004

    When is a pipe stress / expansion calcualtion needed

    Hi Cardin, Please hire an experienced professional, who has successful track record of solving/building similar systems. You have to build it right the first time around. There are so many detailed knowledge you need to properly design, procure, fabricate, install, start-up, and operate the...
  13. curtis2004

    Viscoelastic Behaviour of PE Pipe - In a Sprinkler System

    hgordon (Chemical)(OP)28 Sep 20 22:40 The pipe is PN16 as stated on the plans. The pressure decay over time for the commissioning test was due to creep. The recent test we did does follow a similar curve, 1 bar drop in 1 hour then 1 bar drop after another 7 hours. No pressure relief. I will find...
  14. curtis2004

    Multiple Y-fitting to split the flow

    Hi Sam, I agree with others to employ simple large header with smaller take offs. You have to start and think about process and controls first before having piping system model. I would recommend to use PipeFlow calculation software, where you can model your piping system with all pipe...
  15. curtis2004

    Am asking for the common practice r

    Hi Ax1e, I think, OP was about flanged nozzle of Pressure Vessel being thicker than wall thickness of line being thinner specified by Line Class. It is flanged connection, not welded. Depending on your reasoning, there are can be only three theoretical routes you can take: 1. Do nothing. In...
  16. curtis2004

    Am asking for the common practice r

    Hi XL83NL, Yes, I think everyone knows both are constructed to different codes, and not necessarily pipe schedules would match. Both parties can be right. If piping and PV nozzle schedules don't much how do you deal with this issue? Or is there any issue at all? That is what we are arguing...
  17. curtis2004

    Adjustable Support in Pump

    Hi, It seems this is contractual issue - not a technical. Thanks, Curtis
  18. curtis2004

    Am asking for the common practice r

    LitteInch, The concern is a turbulence introduced by mismatch of ID of corresponding flanges in flanged connection. This may or may not be an issue, because there are may be hundred of valves, elbows, tees, instrumentation, etc. inside of this line and all of it will cause a bit of extra...
  19. curtis2004

    Pressure spike damage to heat exchanger

    Hi, I agree with LittleInch that some numbers would help a lot with schematics, even hand sketch. Can you also give us detail of hot water consumers? What kind of process is it? It sounds that water is not returned back to heater and replaced with 100% make-up. I think, the problem is Air...
  20. curtis2004

    Am asking for the common practice r

    Hi Everyone, I would like to discuss with some numbers for practical prospective of this discussion: Let's assume PV has 3"x300# flanged nozzle. Let's assume PV Supplier wants nozzle neck made of 3"xSch160 pipe. Now, let's assume Pipe Line Class specifies the line to have 3"xSch80 wall. I know...

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