he toplight is mounted on a reservoir top into a preliminary prepared orifice, and then the reinforcing flange is welded.
Vent manifold
. 10 Vent manifold
manifolds are designed to provide two-way dispensing operations, ventilation and avoidance of foreign objects entry inside the reservoir.
Fire safety device
Fire safety devices prevent reservoir from flames and sparks penetration inside it. Therefore, breathing devices - hydraulic and mechanical valves - are set on fire arresters.arrester (Fig.11) consists of a box filled with densely goffered plates of copper, brass, aluminum and other materials with high heat capacity. At flame passage through the flame arrester the plates take heat away from the burning gas and reduce its temperature below the flash point - the flame dies out.
.11 Flame arrester 1 - body; 2 - flanges; 3 - box with plates; 4 - body cap; 5-nuts; 6 - box handle.
Non-freezing breathing valves are mounted on reservoirs with low viscosity products for pressure supporting and vacuum holding in determined limits.serve for losses shortening from evaporation. Upon increasing the pressure in the tank valve produces steam mixture, lifting the pressure plate, and in low-pressure - lets in air tank through the vacuum plate.
. 12 Nonfreezing breathing valve: 1-case; 2-ring; 3-saddle; 4-covering; 5-plate; 6-membrane; 7- clamping nut; 8-directing tube; 9-rod; 10-membrane; 11-core; 12-grid; 13-loads.
eceiving and distributing unit consists of the receiving-distributing manifold, tank-cap valve, tank-cap valve control mechanism that includes a winch and wire rope, the bypass device and the supply pipe.
Dip hatch
A dip hatch serves for sampling and measuring the level of fuel in reservoirs of tank farms.dip hatch consists of a body 1, cover 2, pedal 3, rubber gasket 4 and relieving unit with nut 5. dip hatch housing has a flange in its lower part by which it is attached to a reservoir through a gasket. In the eye of the body is the lever on which the cover 2 with a rubber seal which seals the dip hatch is mounted. Fixing of the covering in the closed position is carried by the relieving unit nut.
. 13 General view of the dip hatch: 1 - body; 2 - covering; 3 - pedal; 4 - rubber gasket; 5 - relieving unit with a nut.
Access door
The access door is designed for internal inspection, repair or cleaning of a vertical steel tank. It is always mounted opposetly disposed to the toplight.
.14 General view of the access LL - 600: 1 - flange; 2 - body; 3 - reinforcement plate; 4 - bolt; 5 - nut; 6 - gasket.
on a floating roof are mounted drainage system water intake, side rolling ladder, manifolds for supporting poles fixing and grounding device.
Tank-cap valve
The tank-cap valve is a metal gate installed on the receiving-distributing manifold. The flap is mounted on the hinge and closes the manifold under the action of its own weight. The valve opening is going either under the pressure of pumped in fluid or due to control mechanism.
.15 Tank-cap valve: 1 - valve open; 2 - valve closed.
.16 Tank-cap valve lifter: 1 - wheel; 2 - lifter shaft; 3 - cylinder; 4 - seal case; 5 - seal hub; 6 - stuffing box; 7 - lifter rope; 8 - tank-cap valve stop; 9 - tank-cap valve.
with floating roof are protected by stationary and mobile units:
with a foam of medium expansion feed into the annular space between the tank wall and the edge of the floating roof;
with a simultaneous foam of low expansion feed from both above the annular gap between tank wall and the edge of the floating roof and into the layer of fuel;
with feed of refrigerant (gas) located in containers on a floating roof in the annular gap and low expanding film-forming foam in the fuel layer.whole I have 15 vertical steel reservoirs with floating roof with capacity of 2000 m 3 in my tank farm.
4. Calculation of reservoir foundation
Foundation under a reservoir is the most critical part of the total structure because it takes the hydrostatic fuel pressure in the reservoir. That allows decreasing the reservoir bottom wall thickness. An error in foundation calculus can lead to uneven reser...
