Use code FLASH20 at checkout for 20% off all eBooks and eCourses
The Thunder Horse project’s sub-sea flow-lines were installed in 6,000’ water depths and filled with chemically treated seawater. After 2 years, investigations were done to determine continued effectiveness of the chemical treatments.
The Thunder Horse project’s sub-sea flow-lines were installed in 6,000’ water depths; the installation of the risers followed a year later. These lines were initially filled with chemically treated seawater in anticipation of hydro-testing and start-up. The initial chemical treatments were in accordance with BP guidelines and EPA GoM specific regulations. The initial chemical treatments consisted of a THPS biocide (~270 ppm), oxygen scavenger (~100 ppm), corrosion inhibitor (~100 ppm), and dye (~30 ppm). The initial chemically-treated fluids remained in place for up to two years during which time installation operations continued. Due to the extended length of fluid residence time, investigations were undertaken to determine the continued effectiveness of the chemical treatments in maintaining the mechanical integrity of the risers and flow-lines. The primary interest of this investigation was to determine the degradation rate of the active biocide product, THPS, under in-situ conditions. With an understanding of the biocide degradation rate, the Project Team could effectively and efficiently maintain the appropriate concentrations of biocide in the fill fluids for the control of microbial influenced corrosion. This paper summarizes the work done by the Thunder Horse Sub-sea Commissioning Team to investigate THPS degradation of chemically treated seawater in sub-sea risers and flow-lines. The investigation included the following. 1. Literature review of associated THPS degradation data, 2. Laboratory study to investigate the degradation of THPS in the sub-sea risers and flow-lines, and 3. A sampling campaign during the execution of the Thunder Horse project’s installation and commissioning scopes of work to quantify the actual THPS initial and final concentrations. Key Words: Hydrotest, THPS, MIC
In this paper the compatibility of the biocide tetrakis(hydroxymethyl) phosphonium sulfate (THPS) and the oxygen scavenger ammonium bisulfite (ABS) were explored. Performance testing of both the biocide in the presence of the oxygen scavenger and the oxygen scavenger in the presence of biocide are reported.
We are unable to complete this action. Please try again at a later time.
If this error continues to occur, please contact AMPP Customer Support for assistance.
Use this error code for reference:
Please login to use Standards Credits*
* AMPP Members receive Standards Credits in order to redeem eligible Standards and Reports in the Store
You are not a Member.
AMPP Members enjoy many benefits, including Standards Credits which can be used to redeem eligible Standards and Reports in the Store.
You can visit the Membership Page to learn about the benefits of membership.
You have previously purchased this item.
Go to Downloadable Products in your AMPP Store profile to find this item.
You do not have sufficient Standards Credits to claim this item.
Click on 'ADD TO CART' to purchase this item.
Your Standards Credit(s)
1
Remaining Credits
0
Please review your transaction.
Click on 'REDEEM' to use your Standards Credits to claim this item.
You have successfully redeemed:
Go to Downloadable Products in your AMPP Store Profile to find and download this item.