Abstract: A breakaway coupling includes a body and a valve assembly inside the body. The body includes a fluid conduit and a shear groove between first and second portions. The shear groove is designed to crack, break, or separate under certain conditions. The valve assembly is designed to shut off fluid flow through the fluid conduit when the shear groove cracks, breaks, or separates. The valve assembly includes a valve seat, a sealing element, one or more pins, and a biasing member. The one or more pins hold the sealing element in an open position while the shear groove is in tack, and allow the sealing element to move to a closed position (with the help of the biasing member) in the event the shear groove cracks, breaks, or separates.

Abstract: Lock down units and loading arms with lock down units are disclosed. According to one embodiment, a loading arm includes a product delivery pipe pivotally coupled to a product standpipe such that the product delivery pipe is rotatable in a vertical plane. A rocker assembly is coupled to the product delivery pipe. A support arm may be pivotally connected to the product standpipe and slidably coupled to the rocker assembly such that the support arm and the rocker assembly are slidable with respect to one another. The support arm comprises a plurality of slots. A locking pawl is affixed to the rocker assembly and selectively engagable with the slots such that, when the locking pawl is engaged with a slot of the support arm, the locking pawl couples the support arm to the rocker assembly, thereby preventing the product delivery pipe from being raised in the vertical plane.

Abstract: Lock down units and loading arms with lock down units are disclosed. According to one embodiment, a loading arm includes a product delivery pipe pivotally coupled to a product standpipe such that the product delivery pipe is rotatable in a vertical plane. A rocker assembly is coupled to the product delivery pipe. A support arm may be pivotally connected to the product standpipe and slidably coupled to the rocker assembly such that the support arm and the rocker assembly are slidable with respect to one another. The support arm comprises a plurality of slots. A locking pawl is affixed to the rocker assembly and selectively engagable with the slots such that, when the locking pawl is engaged with a slot of the support arm, the locking pawl couples the support arm to the rocker assembly, thereby preventing the product delivery pipe from being raised in the vertical plane.