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Hello, Its one culvert with 3 Pipelines in it. Will share the drawings too. The culverts are in bad shape. These pipelines inside the box culverts are supported by sleepers.

Hi All, We have an existing culvert which carries 3 pipelines of 6" crossing an Asphalt road. These culverts are to be replaced . What precautions should we take to protect the pipes under road while replacing the culvert. The pipes are kept at a separation of 1 m from each other.

Hi Dear Members, We have a Pipeline system which is 64” which is designed as per ASME B 31.4 design code. Would like to know if the flanges for this pipeline system can be designed as per ASME Sec VIII Div I by providing design parameters to vendor. Or is there any other design code to be...

Thanks Littleinch for the clarification.. Yea, as u said... it is meaningless to provide interlock of there is no followup action. We are trying to get the client convinced regarding the smatter. Regards, J

Thanks Littleinch and Zdas04 for the clarifications. As the drawing depicts...the kicker line nozzle N8A which will be connected to Point B... Our main question arises , in any case if we have to provide an interlock for kicker line which valve should be provided the interlock.. I believe it...

Thanks Littleinch, true that 100% safe operation of pig is impossible. The sketch of PIG Trap is attached for reference

Hi LittleInch and zdas04, Thanks for the response. As client is insisting to provide these interlock sequence, we have have informed them accordingly that sequencing operation will be 100% safe only if you interlock all the associated valves rather than providing only for Kicker line and main...

Hi All, Do we need to provide key interlock for Mobile Pig Traps... Pig trap Size is 10" x 6".. As per Company only the main line valve and kicker line valve to key interlocked. This mobile pig trap will be used for 10 flow lines...and there are existing flow lines in the field another 15 not...

Thanks Little Inch for the valuable explanation.. Will put a snap shot of our arrangement. We had run an analysis for the system and we could find that the expansion we are getting at the pig trap is 28 mm and as per client requirement it shall be not more than 25 mm. We have tried increasing...

Dear All, Apologies for the delayed response as I was on medical leave for week. Little Inch: from here on I will be participating in all forums related to pipelines. Regarding the question, the pipe is buried and and the operating temp is 78 deg celciuis. We have done an analysis in Caesar...

Hello All, Currently we are designing a pipeline 12" CS (API 5l X 52) with a design pressure of 140 barg and design temperature of 93 deg c. The length of the pipeline is 1.6 km. We wanted t o remove the requirement of Anchor block. currently we are trying to change the routing to station...

Thank you all. As Littleinch asked.. yes it is pipeline ASME B31.4 code. Length of the pipeline is 5 km and we have 5 lines in parallel of same size 6". And as per route, we have road crossing at every 500 m. We want to mitigate the expansion loop or replace with other option. Regards, B

Hi All, Good Day! We have an aboveground pipeline 6" with design pressure of 140 barg and design temperature of 93 deg c. In order to make allowance for thermal expansion, expansion loops are proposed. However, in the handbook of Pipeline Engineering by Henry, there mentions about certain...

Hi All, Is there any size limitation to use seamless pipe in oil and gas application. In the tender client has mentioned to use seamless pipe for less than 16" size. Regards, B

Thanks Biginch, Littleinch and Kevin for the reply. So The main concern is only regarding the OOR and Ovality and handling issues right. Hope this can be solved at site.

Hi All, We have a pipeline of 42" with wall thickness of 9.5 mm which accounts for D/t ratio of 107. Stress Point of view this satisfies. However, code (DEP) specifies the D/t ratio to be less than 96. Is there any particular reason other than handling problems. The pipe is buried and is of...

Thank you XL83NL, pennpiper and LI for your valuable suggestions. As suggested by LI , I will try run the system maintaining the temperature at 105 deg c. Also as suggested by Pennpiper, Will check with Process Guys to provide the real expected temperature for flexibility analysis. Hope it...

Thanks LI for your reply. It was helpful. As here the operating temp is 75 ged c. We have run the system with operating plus 15 deg and in that case the system is passed. However, if we raise the temperature to 105 deg c the system fails at bends. Is there any option to reduce the stress at...

Hi All, We have a 8" pipeline material API 5L X65 and 5 km buried line. Design temperature is 105 deg c where as operating temperature is 75 deg c. We have question on what shall be the temperature to be used in analysis. We have used 105 deg c and the system shows over stressed on bends. Is...

Thank you all for the responses. its really helpful. As little inch asked, our design code is ASME B31.8 The reason for interest in bending radius is that as I mentioned if I uses a wal thickness of 6.35 mm the min bending radius becomes 350 m whereas if I uses 7.04 mm WT the minimum bending...