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150# CS to 300# Inconel
- newdam07
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10 years 9 months ago - 10 years 9 months ago #8320 by newdam07
150# CS to 300# Inconel was created by newdam07
I have a P&ID that shows a spec break at the control valve. The control valve is 150# CS and it is connecting to a 300# Inconel spec. In my short piping experience, I always see the control valve to be the higher rating. Any suggestion on how to make this work without changing the CV because it has already been purchased.
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10 years 9 months ago - 10 years 9 months ago #6844 by Jop
Do it once and Do it Right
Replied by Jop on topic Re: 150# CS to 300# Inconel
I suggest you talk to the Instrumentation Engineer and point out that he (or she) now needs to spec and purchase a Pressure Safety Valve to protect the Class 150 material that will be required to fit-up to the "out-of-spec" control valve.
Someone needs to find out who made the mistake that resulted in the wrong flange class on the control valve.
Also:
A DCN (Design Change Notice) package needs to be created for review by the Project Manager and the Client before any real action is taken.
- The P&ID needs to be marked up to show the new PSV and the additional piping
- A sketch of the new (more complex) configuration needs to be made
- A material take-off needs to be done and given to the Estimators
- A cost analysis needs to be done on the total impact of these new requirements
- A cost comparison needs to be evaluated between the cost of returning the class 150 PSV and the cost of the new PSV and additional piping
Now get the Project Manager and Client approvals
Someone needs to find out who made the mistake that resulted in the wrong flange class on the control valve.
Also:
A DCN (Design Change Notice) package needs to be created for review by the Project Manager and the Client before any real action is taken.
- The P&ID needs to be marked up to show the new PSV and the additional piping
- A sketch of the new (more complex) configuration needs to be made
- A material take-off needs to be done and given to the Estimators
- A cost analysis needs to be done on the total impact of these new requirements
- A cost comparison needs to be evaluated between the cost of returning the class 150 PSV and the cost of the new PSV and additional piping
Now get the Project Manager and Client approvals
Do it once and Do it Right
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10 years 8 months ago - 10 years 8 months ago #6855 by newdam07
Replied by newdam07 on topic Re: 150# CS to 300# Inconel
Thanks JOP
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10 years 8 months ago - 10 years 8 months ago #6858 by Jop
Do it once and Do it Right
Replied by Jop on topic Re: 150# CS to 300# Inconel
Just curious, how did you resolve the problem?
Do it once and Do it Right
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10 years 5 months ago - 10 years 5 months ago #6949 by newdam07
Replied by newdam07 on topic Re: 150# CS to 300# Inconel
Jop,
First, our process people designed the line to be 150# and our instrument engineer prepared the requisition for the 150# CV. But during client review of the P&ID, the client decided and marked-up the P&ID to have the spec break, 300#, after the valve, which is after we issued the PO for the 150# CV.
We asked and got approval from Client to use a 150# flange for a 300# spec only for that connection.
First, our process people designed the line to be 150# and our instrument engineer prepared the requisition for the 150# CV. But during client review of the P&ID, the client decided and marked-up the P&ID to have the spec break, 300#, after the valve, which is after we issued the PO for the 150# CV.
We asked and got approval from Client to use a 150# flange for a 300# spec only for that connection.
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