The Monitor

Production Process Insights

Your Video Guide to Replacing a Sentry STV LP1 Seal

Posted by George Buss on 6/21/21 8:00 AM

Replacing a Sentry LP1 Seal

Metal corrosion is inevitable and can cause catastrophic pipeline and asset failure, damaging the environment and communities, injuring field operators, and causing costly downtime and waste in productivity. However, corrosion is easy to measure with corrosion coupons.

Sentry Saf-T-Vise coupon holders work with various corrosion coupons to measure corrosion rate within a pressurized process, such as a pipeline. With a patented locking collet that enhances operator safety, they safely secure the shaft within the process stream in both low and extremely high-pressure conditions.

Yet, due to the coupon holder’s design, water and other contaminants can accumulate in the seal, causing the sampler to work improperly. Regularly changing the seals ensures that the Sentry LP1 operates as expected.

However, these samplers are usually placed throughout a pipeline and checked at infrequent intervals, which often means operators aren’t familiar with disassembling, repairing or reassembling the sampler.

A Visual Guide to Replacing LP1 Seals

Properly maintaining these coupon holders is critical to keep corrosion at bay. Understanding how to disassemble and reassemble the coupon holder to replace seals is the first step in this process.

When maintaining automatic sampling equipment, IOMs and spec sheets can provide only so much information. A visual, hands-on training tool – such as an on-demand video – can be more helpful when service personnel needs to repair or replace equipment. Training videos can be paused and replayed as often as needed to understand the correct techniques and best practices fully.

Operating staff can watch the following short, four-minute video to replace a Saf-T-Vise LP1 seal properly. See one of Sentry’s expert technicians walk you step-by-step through the replacement process.


Sentry is an expert in the STV LP1 tool and the proper maintenance and replacement of its seals. Our service and support technicians can help troubleshoot any issues in any maintenance or replacement processes.

Contact us at +1-262-567-7256 or complete our online contact form to discuss how Sentry automatic sampling systems can help you achieve safe, simple and accurate sampling results.

Topics: Upstream & Midstream, Liquid & Slurry

Written by George Buss

Picture of George Buss
As one of our expert service technicians, George has been working on Sentry sampling products and systems since 2001. This means he has accumulated a wealth of knowledge and experience with Sentry sampling equipment, and is happy to share his knowledge with customers looking to ensure their sampling equipment is working optimally and efficiently. In his spare time, George can be found fixing stuff and making it work (which also sounds a lot like work, doesn’t it?)