[aubajwa]

Thanks Jop, for providing a birds eye view of ‘Piping Estimates’.

[aubajwa]

Thanks Jop,

Alright I understand. During the plant operation if they find some leaks in hydrogen class service (i hope in any pressurized service), the solution normally comes to steam ring.

Now normally ‘quality’ pipers tend to be aware of possible problems during plant operation and their solutions, and tend to provide facility for those during the layout e.g

– maintaining a std. distances b/w lines, if there is a need of any flanged item in future.
– providing flg. spools to allow for removal of gate valves and check valves. specially near to rotating equipment

similarly for what pressure rating a piper should be aware of any possible requirements of steam rings b/c of flg. leakage (in case).
and How can a piper facilitate this requirement during initial piping layout.

Regards

[aubajwa]

Thanks all.

Nice to know something new.

Just curiuos about what is the criteria for using steam rings for the pipes in hydrogen service.

I am modelling some 3″ and 4″ pipe size, in Hydrogen service (flange rating 900lbs), but the P&IDs not provide
any requirement of steam rings.

Cheers

[aubajwa]

Thanks a lot Jop.

Just little more clarification pls.

As for spec you mentioned it should be indicated on downstream of valve.

My concern is: Why we are bringing valve at higher rated side.
And suppose if we have spec breaks that are of same rating each side, Why yet we indicate it downstream of valve.

Regards

[aubajwa]

Thanks a lot Jop.

Just little more clarification pls.

As for spec you mentioned it should be indicated on downstream of valve.

My concern is: Why we are bringing valve at higher rated side.
And suppose if we have spec breaks that are of same rating each side, Why yet we indicate it downstream of valve.

Regards

[aubajwa]

Morning!

Could pls suggest:

1) Which side of valve pipe spec breaks be mentioned and why?
2) The control valve to contorl the flow is normally incorporated in a fallowing way (Flow direction is from 1 –> 6):
1) Normal pipe —-2)reducer—-3)drain connection—–4) flow control valve——5) reducer again—6) normal pipe
Why the drain connection is located upstream of CV why not downstream.
3) Why the temperarture instrument should be downstream ’10 pipedia’ of pressure intrument.

Regards

[aubajwa]

Morning!

Could pls suggest:

1) Which side of valve pipe spec breaks be mentioned and why?
2) The control valve to contorl the flow is normally incorporated in a fallowing way (Flow direction is from 1 –> 6):
1) Normal pipe —-2)reducer—-3)drain connection—–4) flow control valve——5) reducer again—6) normal pipe
Why the drain connection is located upstream of CV why not downstream.
3) Why the temperarture instrument should be downstream ’10 pipedia’ of pressure intrument.

Regards

[aubajwa]

Hi Jop,

Right, here it goes….

400 – Pipe size? <==== Yes. CL-? <=== Low Pressure Condesate 040-? <==== Unit No 9114-? <=== Line Sequence No A2AS-? <=== Material Spec PP- Insulation Code for "Personnel Protection"? <=== Yes Correct The more I look at the P&ID for these pumps the more questions I have. 1. What is the material of the pump Suction and Discharge lines? <=== Probably A2AS, i.e. CS 2. What is the flange rating for these lines? <=== 150 lb as per A2AS spec...but pump nozzle is 300 lb flange 3. What is the wall schedule for these lines. <=== STD, as pe spec 4. What is the realistic Operating temperature for these lines (not the Design Temperature)? <== Line list shows design temperature only 150 deg C. 5. Why is the main suction line 400mm (16")? <=== well I really have no idea about that. Its the process decision. 6. If the main suction header is in fact 400mm, then what size are the suction block valves? And do they require Gear Operators? <=== Seems to me of same size as of pipe. P&ID not talks about any Gear Operator stuff. ****But Pls suggest what could Gear Operator valves have impact on Piping. Qs 7-11, I hope new REV gives some Idea. Also pls see my Email. 12. Do these pumps have one of the API 682 Standard Pump Seal Plans? <=== YES 13. If so, which one? <=== Seal Category 2 / Code BSTFN 14. How much of the API 682 piping is furnished by the pump vendor and how much is by the Engineering Contractor? <=== For this I have sent info in the Email. I hope Jop I have answered clearly. Thanks

[aubajwa]

Hi Jop,

Right, here it goes….

400 – Pipe size? <==== Yes. CL-? <=== Low Pressure Condesate 040-? <==== Unit No 9114-? <=== Line Sequence No A2AS-? <=== Material Spec PP- Insulation Code for "Personnel Protection"? <=== Yes Correct The more I look at the P&ID for these pumps the more questions I have. 1. What is the material of the pump Suction and Discharge lines? <=== Probably A2AS, i.e. CS 2. What is the flange rating for these lines? <=== 150 lb as per A2AS spec...but pump nozzle is 300 lb flange 3. What is the wall schedule for these lines. <=== STD, as pe spec 4. What is the realistic Operating temperature for these lines (not the Design Temperature)? <== Line list shows design temperature only 150 deg C. 5. Why is the main suction line 400mm (16")? <=== well I really have no idea about that. Its the process decision. 6. If the main suction header is in fact 400mm, then what size are the suction block valves? And do they require Gear Operators? <=== Seems to me of same size as of pipe. P&ID not talks about any Gear Operator stuff. ****But Pls suggest what could Gear Operator valves have impact on Piping. Qs 7-11, I hope new REV gives some Idea. Also pls see my Email. 12. Do these pumps have one of the API 682 Standard Pump Seal Plans? <=== YES 13. If so, which one? <=== Seal Category 2 / Code BSTFN 14. How much of the API 682 piping is furnished by the pump vendor and how much is by the Engineering Contractor? <=== For this I have sent info in the Email. I hope Jop I have answered clearly. Thanks

[aubajwa]

Morning!

I have gone through this topic and could not understand:

a) why author wants y-type strainers to be restricted to 2in max size.

Thanks

[aubajwa]

Morning!

I have gone through this topic and could not understand:

a) why author wants y-type strainers to be restricted to 2in max size.

Thanks

[aubajwa]

——————————————————-
Title: Pump Suction Lines ‘Flooded and Overflooded’
——————————————————-

Morning!

Just got little bit confused with two types of pump suction lines. Pls clear:

A) What difference b/w ‘Overflow Pump Suction Line’. / ‘Flooded oump suction’ (I feel it is normal suction line running from equipment to pump; and should be flooded; in casse if pump is not self priming?).
and Do these two lines normally present in all centrifugal pumps?

B) Process book recommends ‘Overflow pump suction lines are designed for about a one foot/second velocity, unless a higher velocity is necessary to keep small solids or precipitates in suspension.’ <===== What could actually they meant by 'suspending the solids' and why would they like to do so. C)Also in attached figure what could be possible reason fo having a backflow (indicated in red) to pump discharge line again. Thanks

[aubajwa]

——————————————————-
Title: Pump Suction Lines ‘Flooded and Overflooded’
——————————————————-

Morning!

Just got little bit confused with two types of pump suction lines. Pls clear:

A) What difference b/w ‘Overflow Pump Suction Line’. / ‘Flooded oump suction’ (I feel it is normal suction line running from equipment to pump; and should be flooded; in casse if pump is not self priming?).
and Do these two lines normally present in all centrifugal pumps?

B) Process book recommends ‘Overflow pump suction lines are designed for about a one foot/second velocity, unless a higher velocity is necessary to keep small solids or precipitates in suspension.’ <===== What could actually they meant by 'suspending the solids' and why would they like to do so. C)Also in attached figure what could be possible reason fo having a backflow (indicated in red) to pump discharge line again. Thanks

[aubajwa]

——————————————————————–
Title: Key Elements of the P&IDs to be Reviewed by Piping Design Team
——————————————————————–

Dear Jop,

Thanks. I understand what you said. OK Let me be specific.

Being a design supervisor’s point of view, to which extent the design team should go in reviewing P&IDs.
Can you please summarize key elements that must be checked by the Piping Design team.

Regards

[aubajwa]

——————————————————————–
Title: Key Elements of the P&IDs to be Reviewed by Piping Design Team
——————————————————————–

Dear Jop,

Thanks. I understand what you said. OK Let me be specific.

Being a design supervisor’s point of view, to which extent the design team should go in reviewing P&IDs.
Can you please summarize key elements that must be checked by the Piping Design team.

Regards

[Author]

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