×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Ball Valves Comparison with Triple Offset Butterfly Valves for Crude Oil Tank farm Area
2

Ball Valves Comparison with Triple Offset Butterfly Valves for Crude Oil Tank farm Area

Ball Valves Comparison with Triple Offset Butterfly Valves for Crude Oil Tank farm Area

(OP)
[b]Can i use triple offset butterfly valves in place of ball valves. Line sizes range 24" to 56". Pressure rating 150# to 600#. Service is crude oil maximum operating temperature 120DegC. Please guide me i need experts opinions.

RE: Ball Valves Comparison with Triple Offset Butterfly Valves for Crude Oil Tank farm Area



Crude oil is not in itself an exact description of what could possibly gothrough the valves. Crude oil is often rests, residues and an end-product-mix from refineries. You could well face vastly different fluids, gases and additives/residues at pressures and temperatures given.

I believe, as it is very often, that here is no clear yes/no answer to your question. Requirements from different sources will have to be taken into consideration: (end-user, authorities, local and branch standards and requirements, fire-safe requirements, cleaning and closing down requirements (pigging? blocking? venting?), economy, replacement availabillity, company standards, safety standards, cost/time considerations, actuator cost and operation etc, etc). It is easy to oversee requirement and be stuck with responsibillity for this.

Also, most times, this kind of questions stems from considering only one of the many aspects. Most often because 'somone' wants to earn or save some money.

The control question you should ask yourself: is this the best solution for all parties involved?

RE: Ball Valves Comparison with Triple Offset Butterfly Valves for Crude Oil Tank farm Area

(OP)
gerhardl,
Thanks for your nice guidance for me, you are right we can not immediately say butterfly valves can replace ball valves unless we have strong justification and proven records for similar kind of service.
I will collect more data then i will raise further querries.
Sabir

RE: Ball Valves Comparison with Triple Offset Butterfly Valves for Crude Oil Tank farm Area

I agree with Gerhardl, for isolation(no DBB requirement), throttling and sacrificial purpose, maybe TOV is good choice.

RE: Ball Valves Comparison with Triple Offset Butterfly Valves for Crude Oil Tank farm Area

I agree with gerhardl me too: the service conditions (in particular the fluid nature and relevant concerns) should be better detailed in order to allow giving good advice.

However, in general terms, I would guess that if ball valves are suitable for that, triple offset metal (torque) seated valves may work as well (or even better…?).

Of course You should start asking the most specialized and well known Manufacturers.
See, for instance:
within this Forum.


Hope this helps,
’NGL

RE: Ball Valves Comparison with Triple Offset Butterfly Valves for Crude Oil Tank farm Area

Ball valves throttle, butterfly valves don't.

Once you can find a suitably designed butterfly valve for the application, just ask your operators if they can operate without the ability to throttle.

RE: Ball Valves Comparison with Triple Offset Butterfly Valves for Crude Oil Tank farm Area

Ripz,
I guess Your statement about butterfly (and ball) valves must not be intended in general and absolute terms; it depends on how accurate and in which range the flow control is required…: do I understand right?
As far as I know, for example, many triple offset valves have a flow characteristic in the middle between the “equal percentage” and the “linear” types, hence a good rangeability as long as they’re far enough from the completely closed (0°) and completely open (90°) positions; moreover I believe You’ll meet less inertia, friction losses and risks of jamming when You try to rotate a disc in respect to a ball...! winky smile

In any case, well-established Manufacturers may provide calculation software enabling You to predict the opening angle or the flow rate (as well as the noise level) for any given set of service conditions, so that You can understand, case by case, when a certain valve may be suitable or not…


SabirPakistani,
of course well-established Manufacturers may provide “proven records for similar kind of service” (i.e. reference lists) as well, including flow control cases, if applicable.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources