• Sizes 2″ through 12″ (50-300 mm)
  • Available in carbon steel, stainless steel, Hastelloy C, and other materials
  • Wafer mesh element design for quick and easy maintenance


The Groth Model 7758A Deflagration & Detonation Flame Arrester prevent flame propagation in gas piping systems. The design of the Model 7758A Flame Arrester makes it ideal to protect liquid storage tanks containing both NEC Group D and Group C vapors (IEC Class IIA and IIB1 through IIB3 vapors) with a Maximum Experimental Safe Gap (MESG) equal to or greater than 0.026″ [0.65mm].


Models are available in flange sizes from 2″ through 12″ (50 – 300 mm) for the following applications:

  • In-line or end-of-line deflagrations in any piping configuration
  • Stable detonations in any piping configuration
  • Unstable detonations in any piping configuration (element sizes <=12″)
  • Pre-ignition system pressure up to 19.7 psia (1.36 bara) (see DataSheet table, page 70)
  • Pre-ignition system temperature to 140° F (60° C)
  • Bi-directional with respect to flow and ignition source
  • Factory installed integral flame sensors are available


Housings are available in carbon steel, 316 SS, and Hastelloy C and elements in 316 SS, Hastelloy C, and other corrosion resistant alloys.  These arresters are compact with high Ÿow capacity and low pressure drop. Elements are easily removed in-line for cleaning and maintenance and are economical to replace if necessary. Contact Assentech Sales Limited for additional features and options.

Related pressure and vacuum safety-relief products


If you or your team want to know more about Tank Venting or get up to speed with the latest changes to API2000 we will be happy to run a technical seminar or lunch and learn session for you. We make no charge for the sessions for end users or groups of 5 or more people.

Some of our customers testimonials

Emergency-Relief-Valve-Pilot-Operated-2500a  Assentech- pilot operated pressure relief valves service and calibration

After conducting a Third Party Witness Inspection, I was most impressed with Ewart and his team, their professionalism, and product knowledge I found to be excellent.

Ian Johnston

Director, RAK Inspection

Emergency-Relief-Valve-Pilot-Operated-2500a  Assentech- Geodesic Dome Installation

Assentech were subcontracted to assemble and install a 25m geodesic dome for Shaft G on the Lee Tunnel project. My experience with Assentech from pre-contract through to assembly has been very positive. Unlike other subcontractors I have experienced on this project, Assentech had a very positive attitude to producing the level of documentation required for a project of this scale. Leading to a high quality pre construction packaged approved in a timely manner. The communication regarding the manufacturing process was first class allowing us to easily plan our works and prepare the site. Dome assembly was carried out very efficiently and completed to programme. The task was correctly resourced and well supervised. The work force had a positive attitude and carried out the task safely. In summary from my perspective it has been a very easy subcontract to manage with a high quality finished product.

Robert Colthorpe

Site Agent – Lee Tunnel Project, Morgan Sindall

Emergency-Relief-Valve-Pilot-Operated-2500a  Assentech wins supplier excellence award from Eastman Chemicals

We were extremely pleased with the level of service and professionalism demonstrated by Assentech, right from our initial enquiry, through delivery and post installation. As a recipient of only two of these awards made by Eastman Chemical Company in the UK, based on performance in 2014, Assentech are rightly proud of their achievements.

Robert Dodgson

TH3 Project Procurement Lead, Eastman Chemical Company

Emergency-Relief-Valve-Pilot-Operated-2500a  Assentech-IFR Installations at Vopak, Teesside

As you said “you delivered what it said on the tin”. On time and on budget.  Your up front engineering to determine the suitability of your product for our application was second to none, i have not seen anyone else in the industry pay as much attention to detail before you get the purchase order number as Assentech.

Garry Lee

Project Manager, Navigator (formerly Vopak Limited)

Emergency-Relief-Valve-Pilot-Operated-2500a  Assentech-IFR Installations at Navigator Terminals

Assentech have supported our Navigator Terminal (formerly known as Vopak Teesside) on two important projects by providing technical assistance and supplying and fitting a total of 11 Internal floating roofs. Both projects have been completed on schedule and on budget. Assentech have provided an excellent level of experience and front end engineering support with high quality drawings and documentation. Their specialist on site labour have worked collaboratively with us and Assentech have proven to be open, honest and flexible partners.
We have experience of both their Heavy Duty Pontoon type and Full Contact IFR’s and we continually monitor operation and performance of all lFR units Installed on site and consider the Assentech supplied Matrix brandto be the best in the market with exceptional build quality and rigidity. Our clients have inspected the installations and have always remarked upon the build quality and have been impressed with their strength in fully supporting up to four people without noticeable deformation. The design and construction of their stainless steel shoe seals continue to prove to operate excellently with no noticeable reduction in performance or flotation ability over the time since Installation.
Assentsch have proven to be extremely competitive on price and their installation and inspection activities have always been thorough. Navigator therefore have no hesitation in recommending Assentech to other companies considering their services.

Brian Beddow

Project Manager, Navigator Terminals Seal Sands