Floating Roof Tank Drain Assembly

Drain systems especially in climates with high rainfall water can accumulate on the external floating roof.

Floating roof tank drain assembly.

The floating roofs can be either external i e with open top tanks or internal i e inside fixed roof tanks. Hmt s full range of services includes design construction maintenance inspection and repairs of aboveground storage tanks. Atmospheric testing inside tank 4. Tanks with external floating roofs are used primarily to contain liquids with high vapor pressures when the vapor emissions from fixed roof tanks would exceed the standards set by the local jurisdiction.

The floating roof of a floating roof tank is a floating roof floating on the surface of stored liquid floating up or down with the level of stored liquid. Mechanical repairs if. The hmt s products are engineered to provide significant benefits to our customers in the form of increased working capacity reduced heel improved tank safety increased life span reduced emissions and reduced maintenance. The whole assembly is designed and manufactured in a single continuous length with no intermittent joints or couplings to restrict flow.

Rain water and snow can accumulate on the roof eventually the roof may sink. Water on the roof is usually drained from a flexible hose that runs from a drain sump on the roof through the stored liquid to a drain valve on the shell at the base of the tank. The drain will not exert undue force on the floating roof. With our specialized field crews and equipment we have the capabilities to repair and completely overhaul tanks as part of api 653 out of service tank maintenance programs.

Adequate draining of this rain water is very important for safe and reliable operation of storage tanks with external floating roofs. Scan inspection of the tank bottom walls welds man ways and nozzles 9. Floating roof stabilization and cribbing 5. Isolate the tank 3.

The drain systems for use with floating roofs must be capable of flexing through a substantial range of movement so as to accommodate vertical movements of the floating roof between an uppermost position at the top of the tank and a lowermost position in which the roof resides at a relatively small distance above the bottom of the tank. Oil over water to collect the lighter of two non mixable liquids into a vortex breaker. We have crews experienced performing in service internal floating roof ifr and external floating roof efr seal inspections and repairs. The hose often develops leaks and drains both water and product.

Empty tank drain pipeline 2. Drain water on external floating roofs may contain sediments and debris which causes the drains to. Retesting for the presence of hidden vapor inside tank 8. There is a annular space with seal gland between the floating roof and the tank wall to separate air when stored liquid float up or down on the roof greatly reducing evaporation loss in the storage process.

Tank cleaning vapor freeing 6.