RX-9022 is our most commonly used leak detection dye due to its excellent environmental profile and high visibility.
These dyes are also available as solid sticks:
Removal of oxygen from pipe work during the installation stage is important because this is a mechanism for corrosion in pipes.
Traditional oxygen scavengers such as ammonium bisulfite are effective at rapidly removing oxygen from liquids such as seawater. In seawater, scavenging is particularly fast because transition metal ions in the seawater help to catalyse the reaction between oxygen and the bisulfite ions
Oxygen scavenging rate is dependent on the temperature of the liquid and also the dose of scavenger used and the initial oxygen content. The oxygen content of cold water is higher that the oxygen content of warm water meaning that higher doses of oxygen scavenger are required to achieve rapid deoxygenation subsea.
Roemex is able to offer oxygen scavengers is liquid and solid form. Roemex is also able to offer non-sulfite based liquid oxygen scavengers which is good for non-seawater applications
All of our oxygen scavengers are registered with CEFAS and have Gold, no Sub ratings
The scavengers offered by Roemex are:
Roemex use Hach Orbisphere electrochemical sensors in the laboratory which enable screening and performance testing of hydrotest chemicals and oxygen scavengers for efficiency in a variety of water types. This technique can be coupled with LPR tests and pH in one cell so that all 3 parameters can be measured at the same time.
For Hydrotest applications, Roemex is able to supply most commonly used biocides on request.
Our most frequently used biocide is RX-270 which is effective against a wide range of micro-organisms commonly found in oil and water systems, including sulfate-reducing bacteria (SRB) and acid-producing bacteria (APGHB / APB). RX-270 will not cause foaming in water or oil systems. The treatment rate for RX-270 is dependent upon the nature and level of bacteria present. In general, for batch treatments a typical dose rate of 500 - 1,000 ppm would be expected. At these dose rates RX-270 will control the growth and proliferation of bacteria present in the system. RX-270 can also be used for hydrotest situations. The necessary dose rate is dependent upon the length of time protection is required for.
If solid biocide is required, RX-1228 can be used. RX-1228 is a granular biocide which can be supplied in a number of different guises for pipeline hydrotest applications. RX-1228 can be supplied in water soluble tubing or film in a number of different sizes to fit with the application. RX-1228 is also available in a liquid form– RX-1237. For hydrotest applications with sea-water, typical doses are 200 ppm RX-1228 for 0 to 12 months protection and 400ppm RX-1228 for 12 to 24 months protection. In cases where large numbers of yeasts and moulds may be likely a much higher dose of RX-1228 will be required.
Roemex is able to supply RX-5720 for long term corrosion protection (up to 25 years). This product is a solid fatty amine which acts as a persistent film forming corrosion inhibitor. RX-5720 is also available as a liquid version, RX-5718. The main ingredient in RX-5720 is manufactured specifically for Roemex
We are also in the process of developing new liquid and solid corrosion inhibitors for the Hydrotest product range with improved environmental characteristics.
Roemex assesses the performance of corrosion inhibitors for hydrotest using a number of techniques:
Linear Polarisation Resistance (LPR) is a commonly used technique carried out as a rapid screening technique on a large number of inhibitors before submitting for further test work. There is capability for conducting tests under sweet or sour conditions and at temperatures up to 95°C. Partitioning evaluations can also be carried out using the LPR equipment.
It is important to evaluate the long term performance of corrosion inhibitors intended for long term protection. In order to do this we carry out static coupon tests using commonly found metals. The coupons are immersed in seawater or potable water containing the hydrotest chemicals being tested. They are then given a nitrogen blanket, stored at 4°C and are monitored for up to 5 years.
Roemex use Hach Orbisphere electrochemical sensors which enable screening and performance testing of hydrotest chemicals and oxygen scavengers for efficiency in a variety of water types. This technique can be coupled with LPR tests and pH in one cell so that all 3 parameters can be measured at the same time.
Due to pumping and deckspace constraints, it is not always convenient to inject separate oxygen scavengers, biocides and corrosion inhibitors. For this reason, Roemex has developed a number of combined products.
The most commonly requested combinations of products in solid form are:
RX-5208 is a combined Oxygen Scavenger and Biocide which is made up from 33% powdered oxygen scavenger and 67% powdered biocide which can be supplied in a number of different guises for pipeline hydrotest applications. RX-5208 has been specially designed to allow the oxygen scavenger to be released into the seawater before the biocide. This allows the seawater to be deoxygenated prior to release of the biocide. This way there is no adverse interaction / inhibition between chemicals. RX-5208 treatment rate is based on 20 ppm of oxygen scavenger : 1 ppm dissolved oxygen.
Standard RX-5208 stick is 150g with dimensions 260 x 34mm.
RX-5722 is a combined Oxygen Scavenger and Corrosion Inhibitor. RX-5722 is typically supplied in 34mm diameter water soluble tubing. The oxygen scavenger in RX-5722 removes dissolved oxygen from seawater on contact. The corrosion inhibitor in RX-5722 is a solid fatty amine based Corrosion Inhibitor. Quaternary ammonium compounds are good film forming corrosion inhibitors; which means the residual will form an amine film on exposed metal surfaces, thus providing a good excess residual inhibition in the system. RX-5722 has been specifically designed for ROV handled and insertion into specific anchored joints. The Stick is contained in a PVA water soluble tube and film wrapped to control dissolution.