API RP 1004-2003 pdf free download
API RP 1004-2003 pdf free download.Bottom Loading and Vapor Recovery for MC-306 & DOT-406 Tank Motor Vehicles.
4 Bottom Loading for Tank Motor Vehicles 4.1 ADAPTER USED FOR BOTTOM LOADING 4.1.1 Required Features 4.1.1.1 Type To mate with loading couplers, the tank vehicle adapter must have the basic configuration shown in Figure 1 (all tol- erances are provided in the appropriate figure). In the open position, the adapter must have a clear, unobstructed opening 2 in. (50.8 mm) in depth, measured from the outer face or clo- sure of the valve as shown in Figure 1. If a poppet device is used, the adapter poppet must have a travel of 2 in. (50.8 mm), measured from the sealing surface, as shown in Figure 1. The front face of the adapter poppet must be flat within 0.004 in. (0.102 mm), excluding the corner radius. No fastening device shall protrude above the general plane of the adapter face. If an interlock control is installed on the adapter, its dimen- sions must conform to those shown in Figure 2. Table 1 pro- vides equivalent SI values for the customary dimensions shown in Figures 1 and 2. 4.1.1.2 Actuation The primary liquid control must be by means of the set stop meter on the loading island or a self-contained system on the tank vehicle. The coupler may be opened for loading by manual or automatic means. 4.1.1.3 Size of Product Opening The adapter must have a product opening 4 in. (101.6 mm) in diameter at the exposed outer face or closure of the valve. 4.1.1.4 Pressure Rating The adapter must be designed for a working pressure of 75 pounds per square in. (psi) (517 kilopascals) and shall not leak at 1.5 times working pressure. 4.1.1.5 Mounting The mounting must be accomplished by using a Truck Trailer Manufacturers Association (TTMA) standard, light- weight, 8-hole, 4-in. (101.6-mm) flange.
5.2 SECONDARY CONTROL SYSTEMS 5.2.1 Loading-island Mounted A loading-island-mounted system requires an interface connection between the loading-island PSC valve and the tank vehicle. The high-level sensor, through a rack overfill controller, deenergizes the Preset or PSC valve and the inde- pendent SSC valve to stop flow. (Electrical requirements are detailed in 5.4.) Figure 4A and 4B show general schematics for lane shutdown and rack shutdown, respectively. 5.2.2 Tank Mounted Tank-mounted systems require a vehicle emergency valve that can stop flow when triggered by a signal from a high-level sensor. Systems that operate with either air or liquid are avail- able. Tank-mounted systems are most often used on aviation refuelers; however, an electrical interface between the loading island and the vehicle is necessary when loading at a rack. 5.3 TYPES OF SECONDARY CONTROL SYSTEMS 5.3.1 General In systems discussed in 5.3.2 and 5.3.3, the sensor must be deep enough in each of the tank vehicle compartments to assure that once the sensor has been activated, product flow stops before the compartment is completely full. Determina- tion of the proper depth must take into account the maximum product flow rate, shutoff valve response times and tank com- partment volume (that is, the available outage). 5.3.1.1 Maximum product flow rate at the loading rack. For bottom loading racks, this typically ranges from 600 – 900 gallons per minute (gpm) (2.27 – 3.40 cubic meters per minute (m 3 pm) per loading arm. At 900 gpm (3.400 m 3 pm) the flow is 15 gallons per second (gps) (0.057 cubic meters per second (m 3 ps). This flow rate may be different depending upon product and facility, however, tankers should be pre- pared to load safely at any facility.
5 Secondary Shutoff Control System 5.1 LIQUID FLOW CONTROL The minimum requirements for liquid flow control are a primary set-stop or a two stage flow control valve (hereafter referred to as a “primary shutoff control” valve or PSC valve) and an independent secondary shutoff system (here- after referred to as a “secondary shutoff control” or SSC) (see 4.2.1.6). The primary control consists of a preset loading meter and a PSC valve that provides a positive means of selecting and loading a predetermined quantity. The secondary control consists of a level sensor in each compartment being loaded that signals high level to an inde- pendent automatic secondary SSC system that activates the PSC valve and an independent SSC valve to stop flow. The PSC valve and SSC valve at the loading rack must be separate independent devices (See Figure 4A and 4B).
