X

Contractor Defeats Tough Soils to install NG Pipeline in the Lone Star State

09.01.19 - With several large natural gas transmission pipeline projects underway, industry leading pipeline construction contractor Pumpco, Inc. from Giddings in Texas has been busy installing gas pipeline throughout the United States. The multi-facetted pipe contractor is well versed in a wide range of pipeline installation methods. On a recent section of pipe in Southern Texas, near Big Bend State Park, the contractor employed dynamic pipe ramming to install a section of Ø 1.070 mm (42“) pipe under a roadway, through extremely difficult soils. The 65 meter ramming project was part of a larger natural gas pipeline installation. This particular section of 42-inch steel product pipe proved to be very challenging. To install the pipe, Pumpco crews used a 800 mm diameter GrundoramApollo pneumatic pipe rammer.
Rick Melvin, pipe ramming specialist with TRACTO-TECHNIK’S US sister company TT Technologies said, “This project was full of challenges, but the crew know what they’re doing with their modified pipe ramming version of slick bore. Plus, having the most powerful pipe rammer in the world on the job, helped as well.”

Slick boring

During the slick-bore process the product pipe is welded to the back end of an installed bore pipe. A winch is connected to the lead end of the bore pipe and is used to pull the casing out. As the bore pipe is removed the product pipe is pulled into place. In this scenario, the bore pipe is installed with a pneumatic pipe rammer. Once the product pipe is installed, the bore pipe can be used again for the next slick-bore. The bore pipe does all the difficult work and allows the product pipe to be installed as stress free as possible.

On The Job

Pumpco crews began by digging a 50 m trench leading up to the crossing to accommodate the new product pipe on the north side of the road. An oversized trench was completed on the south side of the road to facilitate pipe ramming operations. Once prep work was complete, crews welded a cutting shoe on the lead end of the first section of the dummy pipe.

Melvin said, “The cutting shoe really strengthens the leading edge of the pipe for maximum penetration through difficult soil and rocks. Because of its oversized cut, the shoe reduces both external and internal friction on the pipe. The cutting shoe also helps protect the pipe’s coating or insulation. Now on the Pumpco project, they were not able to utilize bentonite, but in other configurations the cutting shoes also create a channel for the flow of a bentonite/polymer mixture. Their conical internal surface reduces soil displacement and influences the bore’s accuracy.”

Ramming proceeded without incident for several casing sections until progress slowed dramatically. Pumpco Project Manager Hunter Hill said, “The entire crossing was approximately 65 m from entry to exist. We made it 45 m and ran into, what I’d describe as, a naturally occurring coble concrete that completely halted the progress. We advanced 1 m one day and then maybe 30 cm the next day. So we decided to stop, figuring that the pipe might actually be collapsing, and try to dig it up and see what we encountered.“
 
“We had to use a hammer hoe to break through the material and expose the pipe in the easement. If we didn’t have that big hammer, we wouldn’t have made it to the other side, we would have been stuck under the road.” Once the pipe was free, Pumpco crews rammed another section of bore pipe in and cut off the now deformed cutting shoe. After backfilling back to the road, crews began cleaning out the casing.
 

HDD rig used for pipe cleaning

Pumpco Project Manager Hunter Hill said, “We used an HDD rig to clean the spoil out of the carrier pipe. First we used a mud motor, going in and out for the first 6 m or so. Then we ran some cross over subs and used a 24-inch (Ø 610 mm) rock motor backwards to clean out the rest. We yo-yoed through it pulling out a little bit at a time until we only had a little bit of debris in the bottom. Then we pushed a pig through the pipe and that squeegeed it right out.”
After the spoil was clear, crews welded the new product pipe to the end of the installed casing and then moved the Grundoram to the north side of the road. There, crews welded a small section of 500 wall casing, a sacrificial pipe, to the back of the product pipe to facilitate the rammer. With the spoil cleaned from the bore pipe, crews were able to ram the product pipe in slowly without incident. Pumpco crews simply cradled the product pipe during the process with side booms and straps until it was completely installed. Once the installation was complete, Hill’s crew removed the bore pipe and the sacrificial pipe section and turned the project over to another Pumpco division to continue tying the line into the rest of the pipeline. The entire project took two weeks for set up and one week for ramming and welding.
News-Overview

DO YOU HAVE ANY QUESTIONS?

WE WILL BE GLAD TO HELP YOU!

YOU CAN REACH US
BY PHONE FROM
MONDAY TO FRIDAY
07:00 TO 17.00 O'CLOCK!

CALL US!

SEND US A MESSAGE
AND WE WILL GET BACK
TO YOU!

WRITE TO US!
Contact

Do you have any product or
services related questions?

Please contact us:

+49 2723 808-0

SEND E-MAIL
X

Privacy settings

We use cookies on our website. Some of them are essential to operate the website, while others help us analise the use of our website and improve our services. By clicking on "I accept" you agree to the processing of your data. You can use the "Individual cookie settings" button to refuse the use of cookies or to customise them at any time. You will find more detailed information in our data protection declaration.

Necessary
Statistics
Marketing
Accept all

Only accept necessary cookies
Individual cookie settings
Privacy statement | Legal notice

Privacy settings

X
Here you will find an overview of all cookies used. You can give your consent to the categories and display further information.
Accept all Back Store

Necessary>

Cookie
autokat
Cookie assist to provide the category for the download area.
autopg
Cookie assist to provide the product group for the download area
autop
Cookie assist to provide the product for the download area
tt_c_req
Consent to the use of necessary cookies. This figure can not be altered. If you don't store this figure, we can't allow you to access this page.
tt_c_stat
Consent or disapproval of cookies to create statistics
tt_c_marketing
Consent or disapproval of cookies for market analysis. Integrated Youtube-Videos can only be played with consent.
cftoken
This cookie is used to determine the type of device the guest is using, so that the website can be correctly formatted. This information is stored inside cookie "CFID".
cfid
This cookie is applied in connection with the cookie "cftoken". The cookie stores a specific ID for the guest, as well as the device and browser of the guest.
c_domIDPrefix
Cookie assist to store the chosen domain.
c_domIDSuffix
Cookie assist to store the chosen domain.
c_login
Cookie assist to store the login-data.
cfglobals
Is defined by Adobe ColdFusion to identify the client device, so that the website-user-session variations can be stored.

Statistics>

Cookie
_ga
Registers a unique ID, which is applied to generate statistical information, showing how the visitor uses the site.
_gat
Is applied by Google Analytics to restrict the requirement rate.
_gid
Registers a unique ID, which is applied to generate statistical information, showing how the visitor uses the site.

Marketing>

Cookie
ads/ga-audiences
Used by the Google Tag-Manager.
gps
Registers a unique ID on mobile devices, to enable tracking based on the geographic GPS location.
ide
Applied by Google DoubleClick to register and report the users actions on the website after viewing or clicking on one of the providers ads, for the purpose of measuring the effectiveness of an advertisement and displaying targeted advertising to the user.
pref
Registers a unique ID, applied by Google to obstain statistics on how visitors use YouTube-Videos on various websites.
test_cookie
Used to check whether the visitors browser supports cookies.
VISITOR_INFO1_LIVE
Tries to estimate the user bandwidth on pages with integrated YouTube-Videos.
YSC
Registers a unique ID to keep statistics of YouTube videos, which the user has seen.
yt-remote-cast-installed
Stores the user settings when retrieving a Youtube-Video integrated on other websites.
yt-remote-connected-devices
Stores the user settings when retrieving a Youtube-Video integrated on other websites.
yt-remote-device-id
Stores the user settings when retrieving a Youtube-Video integrated on other websites.
yt-remote-fast-check-period
Stores the user settings when retrieving a Youtube-Video integrated on other websites.
yt-remote-session-app
Stores the user settings when retrieving a Youtube-Video integrated on other websites.
yt-remote-session-name
Stores the user settings when retrieving a Youtube-Video integrated on other websites.
CTCNTNM_a8a9cd6e100ea022
Cookie from wireminds GmbH to analise visitor behaviour. This may involve the collection, processing and storage of data from which user profiles are created under a pseudonym.
track
Cookie from wireminds GmbH to analise visitor behaviour. This may involve the collection, processing and storage of data from which user profiles are created under a pseudonym.