Adjustable Pressure Snubbers Used to Protect Instruments Against Pressure Surges in LACT Units

We recently met with a customer in Odessa, TX, who was having an abnormal amount of smart pressure transmitter failures in their LACT skids from one customer’s region.

Lease Automatic Custody Transfer (LACT) units are used for the unattended and automatic measurement of the quality and quantity of crude oil, typically from well head producers to purchaser, or from truck offloading into storage tanks. These sites are typically on production lease sites in remote areas. Continue reading “Adjustable Pressure Snubbers Used to Protect Instruments Against Pressure Surges in LACT Units”

Intrinsically Safe Products for Hazardous Locations

Figure 1

When considering a product for a hazardous location, it is important that the product is appropriately rated for that environment. UL, one of the primary bodies that certifies products for use in hazardous environments, defines a hazardous location as a “location where explosion or fire hazards exist due to the presence of flammable gases, flammable or combustible liquid-produced vapors, combustible dusts, or ignitable fibers or flyings.”[1] Figure 1 shows the conditions that are required to create fire and are often present in hazardous environments: oxygen, an ignition source, and flammable material. Continue reading “Intrinsically Safe Products for Hazardous Locations”

U.S. and International Threaded Connection Standards

Threaded Connections

Threaded connections are often referred to as a process connection type. For Dwyer product specifications, this connection type is typically NPT (National Pipe Thread), which is an American standard thread. These connections allow products to be installed directly into piping or with the use of threaded fittings.

For threaded connections there are two common types, (1) straight or parallel thread and (2) tapered thread. Continue reading “U.S. and International Threaded Connection Standards”