Re: [MW:5062] Piping Category

Dear Dihnesh,

Based  on B31.3, OWNER SPECIFICES THE PIPING SYSTEM,

 Normal—ordinary process piping service

Category M—Lethal fluid service

High Pressure—Exceeds ASME B16.5 pressure limits for Class 2500 flanges

Severe Cyclic—Stress at a joint exceeds 80 percent of the allowable stress range and the number of thermal cycles will exceed 7,000

Category D—Innocuous fluid, low-pressure, and not very high-temperature service

B 31.3 FLUID SERVICE ,

Category D: The fluid handled is nonflammable, nontoxic and not damaging to human tissue. The design pressure doen not exceed 150 psig ( 1035 kPa). The Design temperature is greater than -20deg F (-29 dec C) and does not exceed 186deg C. OFTEN CHARACTERIZED AS " UTILITY".

Category M: A fluid service in which the potential for personnel exposure is judged to be significant and in which a single exposure to a very small quantity of a toxic fluid, caused by leakage, can produce serious irreversible harm to persons upon breathing or on bhodily contact, even when prompt restorative measures are taken. OFTEN CHARACTERIZED AS " LETHAL".

 

Severe Cyclic conditions: Conditions applying to specific piping components or joints in which Se.... exceeds 0.8 Sa and the equivalent number of cycles exceeds 7000; or conditions which the designer determines will produce and equivalent effect.

Regards,

Yadav Shiva Chelliya,
Inspection Engineer,
Doha Qatar,
+974-6166465

 

 

 

On Tue, May 4, 2010 at 9:35 AM, dhinesh gnanadhas <dhineshlhmm@gmail.com> wrote:

Hi

Based on Which criteria the Piping services are being categorised as
Category 'D',  'M', Normal & Sevier Cyclic fluid?

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