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4

Api Standard 612 Data Sheet Symbology


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#1 alextor

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Posted 17 May 2019 - 01:11 AM

DATASHEET STEAM TURBINE (Annex A )  contains cells  "TEMPERATURE °C (TT)".

Which means abbreviation (TT)?



#2 Pilesar

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Posted 17 May 2019 - 11:05 PM

The steam temperature changes as it passes through the turbine. The maximum steam temperature inside the turbine is at the inlet. I think TT indicates the steam inlet location -- called the 'trip and throttle valve' or 'throttle trip valve'.



#3 alextor

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Posted 19 May 2019 - 10:34 PM

The steam temperature changes as it passes through the turbine. The maximum steam temperature inside the turbine is at the inlet. I think TT indicates the steam inlet location -- called the 'trip and throttle valve' or 'throttle trip valve'.

I can not agree.

For example, the abbreviation (TT) is used for steam "EXHAUST"



#4 Pilesar

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Posted 20 May 2019 - 12:41 AM

Well, I could guess again. (Typical Temperature?) But perhaps you will find the answer and report back so I will know also. In my opinion, any information on a data sheet that is not clearly defined is a potential problem. Both the vendor and the purchaser need to understand the specifications alike so they can agree on expectations. Abbreviations can be especially troublesome since there is no single set of universally recognized definitions. I would not be surprised if real transactions between purchaser and vendor use a different data sheet containing something other than 'TT' as a modifier since this is apparently an unclear term.



#5 breizh

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Posted 20 May 2019 - 01:23 AM

Hi ,

TT : temperature transmitter ?

my 2 cents

Breizh



#6 thorium90

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Posted 20 May 2019 - 01:53 AM

Actually, alextor, why not just post a picture of what you see?

Won't it be easier to understand and interpret it rather than a whole thread of guesses?

I'm pretty sure you will get a straight answer if we all can just see what you have seen.



#7 alextor

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Posted 20 May 2019 - 03:38 AM

 I would not be surprised if real transactions between purchaser and vendor use a different data sheet containing something other than 'TT' as a modifier since this is apparently an unclear term.

 

I saw (TT) in the real data sheet.

 

 

Hi ,

TT : temperature transmitter ?

my 2 cents

Breizh

It would be strange. DATA SHEET requires mandatory measurement EXHAUST steam, AUXILIARY steam? Why?

Why is this required in the STEAM CONDITIONS section?

 

Actually, alextor, why not just post a picture of what you see?

Won't it be easier to understand and interpret it rather than a whole thread of guesses?

I'm pretty sure you will get a straight answer if we all can just see what you have seen.

A good idea

https://drive.google...iew?usp=sharing



#8 thorium90

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Posted 20 May 2019 - 06:27 AM

Thanks for the upload. It does clear things up.

 

I believe it means Total Temperature; static plus the dynamic temperatures.


Edited by thorium90, 20 May 2019 - 10:05 AM.


#9 breizh

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Posted 20 May 2019 - 06:39 AM

Hi,

I believe it has to do with an energy balance (TT).

I have added a tool to support you for this kind of exercise.

.https://www4.eere.en...ol/equipTurbine

 

Good luck

Breizh



#10 alextor

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Posted 20 May 2019 - 11:04 PM

I believe it has to do with an energy balance (TT).

I have added a tool to support you for this kind of exercise.

.https://www4.eere.en...ol/equipTurbine

 

 

AUXILIARY steam not involved in the energy balance, but has the abbreviation (TT)

 

I believe it means Total Temperature; static plus the dynamic temperatures.

I think this is the most reasonable conclusion.

But it looks like this is only an assumption

not confirmed by regulatory documentation





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