RE: [PipingDesign] RTJ or RF flange?

From: <SARE>
Date: Sun Jun 10 2001 - 05:11:00 EDT

1. Same here. above class 600#, our preference is RTJ with oval type gasket (not the hex). If you want to know the nuts and bolts of Flange design, i recommend "design of process equipment" by kanti k. mahajan - look for chapter 2. the other excellent source is the taylor forge catalog no. 722.
2. For hydrogen service, the weld neck raised faced is ok but used xs and material conforming to astm a182 gr f11 class 1. our application is limited to 8"NPS with max temp/pressure of 550C/2550 kpa. normally the piping material for hydrogen service is cr-mo. got to take care also of proper welding procedure.

hope this help.

• Original Message ----- From: sankaranarayanan dalawai <dmsbhawani@yahoo.com> To: <PipingDesign@yahoogroups.com> Sent: Friday, June 08, 2001 2:23 PM Subject: [PipingDesign] RTJ or RF flange?

> Hai all,
>
> 1)I need to know when to select a Raised face flange
> and when to use a Ring Joint flange . In the company I
> worked earlier we used to specify RTJ ends for flanges
> above 600 rating ( i,e 900 and above )and Raised Face
> for 600 rating and below. Is there any book /technical
> literature that give the information on choosing the
> flange ends with solid technical reasons.
>
> 2)Can any body tell me from their experience for
> Hydrogen and Nace service 900 /1500 rating is it good
> to use RF flange or an RTJ flange ( As I want to use
> the RTJ FLANGE whereas some are saying they had leaks
> on RTJ and want to use RF flange )
>
> Any guideline / input /experience will be highly
> appreciated.
> Thanks in advance.
> Narayanan.

---

Piping Design Central
[ http://www.PipingDesign.com ]

---

We hope you find this newsletter useful. If not, you can unsubscribe at:
PipingDesign-unsubscribe@yahoogroups.com Post message: PipingDesign@yahoogroups.com Subscribe: PipingDesign-subscribe@yahoogroups.com

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Received on Sun Jun 10 05:11:00 2001