Recommended for you
Replacement options for Carbamate Separator Level Transmitter
13.07.2020, 11:47 by umarsaeed999
Measuring the weight of products in railcar wagons in motion
11.07.2020, 12:05 by mark.brouwer
UreaKnowHow.com introduces a new initiative for the nitrogen fertilizer industry: An E-MarketPlace for revamps, upgrades, equipment supply, diagnostics, audits, repairs, etcetera. Post your equipment / project and/or services requests or offers (excluding confidential information) in our E-MarketPlace. Click here for posting your inquiries and click here for posting your offers.
High Temperature Hydrogen Attack (HTHA) is a problem which concerns steels operating at elevated temperatures in hydrogen environments. It is not to be confused with hydrogen embrittlement or other forms of low temperature hydrogen damage. HTHA is a time-temperature-pressure function. These, basically means the longer that a piece of equipment is exposed to temperatures above its resistance limit in certain hydro-process environment (see API941-NELSON Curve), the more damage to the steel will accumulate; and the higher the temperature rises above the limit of the steel, the more rapidly the damage will occur. Monitoring the integrity of equipment in HTHA-Service is necessary to avoid accidents, especially if one of the following reasons are true: - HTHA in many old plants -is true for many ammonia plants- can occur especially after a long onstream-time, if the incubation time ended. - However, there have been several cases where HTHA was found, even though operating conditions were below the Nelson Curve. - There are new findings since 2016: After explosion in the TESORO refinery with 7 dead, it must be assumed that HTHA in C steel can already be expected at > 204 °C and a hydrogen partial pressure of pH2 > 3.45 bar. It is strongly recommended to monitor the integrity of HTHA vulnerable equipment! Due to the age of many ammonia plants, a lot of equipment may need to be replaced. For avoiding HTHA of new equipment, use the recommendations for fabrication of new equipment in the hydrogen service according API 941 and API 934A! Click here for more information
We did set a new record on March 12, 2020. 150 users were active in our Round Tables. Our Round Tables discuss all kind of issues in nitrogen fertilizer plants among our 6500+ Members of all nitrogen fertilizer plants worldwide. More than 1800 topics are under discussion with more than 9200 posts, so on average each topic has five replies. Truly an active forum improving the safety and performance of all plants in our industry. Join also our Round Tables
More and more measures are taken in order to control the spread of the Corona virus. More and more regions are affected and stricter travel policies apply.
Luckily via UreaKnowHow.com all of us can easily stay in contact with each other!
Nearly 6500 managers, engineers and specialists working in all nitrogen fertilizer plants worldwide can be safely contacted without any restrictions.
Have a look in our Round Tables with nearly 1800 topics under discussion and more than 9000 posts and contact the participants.
Have a look at our Library with 1000+ Technical Papers, our Photo and Video Galleries and contact one of our Experts.
And contact our Sponsors via their dedicated Sponsor pages and have a look how they can support you with dedicated solutions.
Go to the Sponsor Pages
Urea World News