AS PER SECTION VIII DIV 1,FLANGES NEEDS SERRATIONS MANDETORILY WHEN CAF GASKETS(COMPRESSED ASBESTOS FIBER)IS UESD?

NO.
Mauro

I am quite surprised, thought that Asbestos is not more allowed allaround the world!?

DK

Dear Dr.Koelbl,
could you pl. explain me what exactly you want to say?
Thanks
amol

Asbestos or asbestos containing substances are no more used any where in the world now. may refer OHSAS18001 for more details or consult your SHE expert. Since CAF is made out of asbestos. These Gaskets too are no more used in the Oil & Gas industry.

_________________
Raghuram

DEAR SIR,
A)WHY CAF GASKET IS BANNED?

B)ACTUALLY WE WANT TO USE CAF FOR HYDRO & NOT IN OPERATING CONDITION.OUR CUSTOMER HAS ASKED FOR O-RINGS. BUT TO AVOID MAKING O-RING GROOVES, I WANT TO USE CAF.

C)IN APPENDIX 2 OF SEC. VIII DIV 1
VALUES FOR ASBESTOS GASKET SEATING STRESS IS GIVEN AS 1600 PSI
& GASKET FACTOR AS 2.CAN I USE THIS FOR CAF TO FIND OUT BOLT LOAD?

amol,
apart from that CAF=asbestos,
I believe you have redesigned the flange thickness when changing from oring to flat gasket design, haven't you?

_________________
Konrad Anikiel

DEAR SIR,
ACTUALLY THICKNESS IS GIVEN BY CLIENT.
I HAVE CHEKED THE PROVIDED THK. WHICH IS ADEQUATE.

FOR CHECKING THK. , BOLT LOAD IS CALCULATED BY USING VALUES
OF GASKET FACTOR & GASKET SEATING STRESS FOR ASBESTOS GIVEN IN APPENDIX 2 ,TABLE 2-5.1OF SEC. VIII DIV 1.

SO. MY QUESTION IS
1) IS IT CORRECT TO USE ABOVESAID VALUES FOR CAF GASKET.I AM ASKING THIS BECAUSE CAF WORD IS NOT GIVEN IN THAT TABLE.

2) WHY CAF IS BANNED

3) WHEN O-RINGS ARE USED(ANY CRITERIA RELATED TO TEMPERATURE OR PRESSURE)

THANKS A LOT IN ADVANCE.

amol,
1. CAF stands for Compressed Asbestos Fiber. CAF is asbestos. Full stop.
2. http://en.wikipedia.org/wiki/Asbestos_and_the_law
3. http://en.wikipedia.org/wiki/O-ring

Interesting thing for me is where are you from, so you didn't know that use of asbestos is forbidden in large part of the world. I know that it is not forbidden in India and the likes, but I thought that people out there at least know about asbestos issues. I was born in Poland, and I remember very old firefighting blankets (for extinguishing small fires like in a workshop etc), but they already have been out of use. And that was a communistic country, where issues like asbestos were always lagging behind the rest of the world. Last time I saw anything made of asbestos was probably more than 20 years ago!

_________________
Konrad Anikiel

Amol:

CAF is asbestos and from a HSE perspective ifs definitely a no-no.

I am from India, and in my professional experience it is my observation that for all the Indian projects I have worked on, the project specifications EXPLICITLY mandate NOT using asbestos. Further, it is a common practice to insist the vendor to use during hydrotest the same type of gasket used in actual service gaskets.


Regards,

Jehan N

Dear sir,
A)i am very much surprised despite the ban, why it is appearing in table
TABLE 2-5.1OF SEC. VIII DIV 1.


B)as we are getting quotations of CAF GASKET from many suppliers & it is easily available in India,probably our customer has given clearance to use it. So my question is still remauns unanserwed which is

FOR CHECKING THK. , can BOLT LOAD IS CALCULATED BY USING VALUES
OF GASKET FACTOR & GASKET SEATING STRESS FOR ASBESTOS GIVEN IN APPENDIX 2 ,TABLE 2-5.1OF SEC. VIII DIV 1?

thanks

Amol:

A] Even if CAF is included in ASME, there re statuary local and federal regulations and project specifications to be respected. The ASME B&PV code is after all a code and lays down the so called “minimum design guidelines”. Additional design specifications and standards thus will also have to be respected. I googled on India’s asbestos policy and what I read in http://infochangeindia.org/200610176179 ... iller.html was definitely NOT encouraging. Nevertheless, like I have specified in my previous post, on all INDIAN PROJECTS I have worked, the design specifications have explicitly ban asbestos and its derivatives. CAF/ asbestos is carcinogenic!If I am not mistaken CAF was extensively used world wide till it’s deliterous effects became known only in say the past 10-20 years. Prior to that, it was extensively used in industry owing to its’s low cost and favourable properties. In the past CAF gaskets were used and thus the ASME Code included the same in it’s m and y value table.
As a policy, I would not use asbestos products even if the design specs and standards do not explicitly restrict it’s use. Also, have a look at the initial 5-10 (unsure which one) pages of API-650 which has some commentary on use of asbestos.

B] If given in ASME Appendix 2 m and y values can be used to calculate the required bolt load. You can use it but the more relavant relevant question is using CAF in the first place.

-jehan n