Slope in steam lines
Slope in steam lines
(OP)
Hi all,
The Slope in steam lines is different (exp 0.5%, 1%, 2% <---- as I see in some projects).
But Generally who should decide about the amount of slope (piping or process designer) and how the suffiecient slope is calculated? does any criteria exist to select the piping slope or related to experience?
Regards,
Mehdi
The Slope in steam lines is different (exp 0.5%, 1%, 2% <---- as I see in some projects).
But Generally who should decide about the amount of slope (piping or process designer) and how the suffiecient slope is calculated? does any criteria exist to select the piping slope or related to experience?
Regards,
Mehdi





RE: Slope in steam lines
So steam piping in Alaska would be specified with more slope than in Kuwait. Steam purge lines that are off and on would have 3% or more. So experiance and thought about the total project will dictate.
RE: Slope in steam lines
I have never seen increased slope on steam lines in colder climates. The typical solution is to increase the insulation thickness. You might only need 1" of insulation in Kuwait, but may need 3" in northern Alberta. There is no other way but to run some calculations to determine what's both required and economical.
RE: Slope in steam lines
BS 806 requires a 1/100 slope with the flow for steam lines and a 1/40 against the flow for steam lines. Some of the clients require that more slope is used, but this generally causes other problems with weld fit-up and the use of pulled bends to accomodate the slopes, which is expensive.
Cheers
Rob
RE: Slope in steam lines
As noted by TBP, many programs for calculating condensate loading are out there; personally I like the TLV America methodology, which is in the free software download at this site:
http://www.tlv.com/en/index.html
RE: Slope in steam lines
NozzleTwister
Houston, Texas
RE: Slope in steam lines
RE: Slope in steam lines
RE: Slope in steam lines
EN 45510 states that, whenever possible, the main should be installed with a fall of not less than 1:100 (1 m fall for every 100 m run), in the direction of the steam flow. This slope will ensure that gravity, as well as the flow of steam, will assist in moving the condensate towards drain points where the condensate may be safely and effectively removed”
Go to
http://w
Cheers
Luis
RE: Slope in steam lines
Spot on. Agree with your post entirely. I have been involved in many steam systems in the UK and practically every one of any length had slopes associated with them to ensure condensate drainage. I have seen the results of systems with inadequate drainage and it ain't pretty. You have rightly pointed to the spirax sarco site which gives recommended slopes for steam systems. Also in some cases because of the topography of the land slopes have been installed against the normal flow of the steam. In these cases the slops is increased to ensure that the condensate flows back to drain pots.