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  1. #1
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    HOWDEN Compressor WRViX stage



    Dear All,
    I want to select a HOWDEN compressor for compressing Methane from 5 bara to 30 bara with 21000 kg/hr mass flow. How is that possible in one single stage because of too much pressure difference?
    when I try software to select nearest stage, it gives me warning because it select WRViX 365-193. What is the problem with this stage because of X variant?

    thanks in advance



  2. #2
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    Re: HOWDEN Compressor WRViX stage

    These guys might be able to help you out..

    Howden Process Compressors

    Mail: hpc.sales@howden.com
    Phone: +44 141 304 3500
    Fax: +44 141 304 3600

    Old Govan Road
    Renfrew
    PA4 8XJ
    United Kingdom

  3. #3
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    Re: HOWDEN Compressor WRViX stage

    Thanks for information.
    As I understand X variant means it is high pressure series from Howden compressors and because of high pressure; exerted loads are close or exceed the bearing resistance hence they should evaluate the system in order to not facing any problem during operation.

  4. #4
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    Re: HOWDEN Compressor WRViX stage

    Hi,Little Prince

    Quote Originally Posted by Little Prince View Post
    Dear All,
    I want to select a HOWDEN compressor for compressing Methane from 5 bara to 30 bara with 21000 kg/hr mass flow. How is that possible in one single stage because of too much pressure difference?
    when I try software to select nearest stage, it gives me warning because it select WRViX 365-193. What is the problem with this stage because of X variant?

    thanks in advance
    No problem with selection software ... you need to contact Howden anyhow ... they can give you required compressor...

    for your info: VRViX
    W- wet i.e. oil injected
    R- Refrigeration
    V- volume control - with slide valve
    i- infinitely variable volume from 2.2-5.0
    X - eXtra high discharge pressure around 30 barg and oil pressure must be higher

    Hope this help a little...

    Best regards, Josip

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

  5. #5
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    Re: HOWDEN Compressor WRViX stage

    One thing which I want to know, for shaft sealing system, does API Plan 52 counts for API conformity? We have to supply our Howden compressor with double shaft sealing system and as per Howden proposal we chose API PLAN 52, but our Client decline to accept because they think it is not according to API 619-614 regulation.
    Please advise.

  6. #6
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    Re: HOWDEN Compressor WRViX stage

    Hi, Little Prince

    Quote Originally Posted by Little Prince View Post
    One thing which I want to know, for shaft sealing system, does API Plan 52 counts for API conformity? We have to supply our Howden compressor with double shaft sealing system and as per Howden proposal we chose API PLAN 52, but our Client decline to accept because they think it is not according to API 619-614 regulation.
    Please advise.
    To be honest I do not know what is exactly written in API 619-614 regulation ...because I do not have those regulation, but, check this link .... pages 4,5,6
    http://www.howden.com/NR/rdonlyres/7...ompressors.pdf

    This would be acceptable for process screw compressor, but doing my jobs all around the world sometimes I met Client's personnel asking questions and expressing some doubts regarding installed plant/s. Some question/s were OK and some just showed that operators are not at home within the field they have to operate and take care.

    here are some more shaft seal plans by John Crane
    http://www.google.hr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=12&cad=rja&sqi=2&ved=0CG4QFjAL&url=http%3A%2F%2Fwww.kupujucpa vky.cz%2Fe-catalogue%2FDataSheets%2FOther%2FAPI_plans_poster.pdf&ei=KGqzUdesF4mp4ASP4oCQDw&usg=AFQjCNG-9NuaMjgzuQT2_ywN2Z4xQKyHGA&sig2=otxKlV1_Fps1KK2h-Gm6ZA&bvm=bv.47534661,d.bGE

    http://www.aesseal.com/apiplan.aspx/1/Oil-and-Gas


    Please, check this link too: http://www.eng-tips.com/viewthread.cfm?qid=157105
    post #4 JJPellin

    Plan 52 is a double seal. Leakage of the primary seal can be detected because product will be leaking into the seal pot. If the product tends to vaporize at flare pressure, the leak will be detected by pressure increasing behind the orifice in the vent line. If the product tends to remain liquid at flare pressure, the level in the pot can be seen to rise by the operators on normal rounds. If they fail to notice and the pot becomes full of liquid up to the orifice, then pressure will back up and be detected. A leak of the outer seal can be detected by visible leakage of the barrier fluid to the base. Also, the level of fluid in the pot could be seen to drop. However, in some services, depending on the barrier fluid used, the level could drop slightly just from barrier fluid vaporizing to flare. We see this with #1 fuel oil barrier fluid in not services. A loss of level in the pot is typically seen by operators on normal rounds checking the sight glass. A low level switch could also be used, especially for remote or unmanned installations to detect outer seal leakage.
    as described it is normal double seal installation regarding safety .... furthermore it is possible to install a few gas sensors around the unit to be sure there is no gas leakage or in case of leakage it will be discover immediately. Nothing is 100% sure and safe.

    Hope this is of some help.

    Best regards, Josip

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

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