Cycle stock

Cycle stock (recycle stock) denotes any product that is recycled, that is, taken back to an earlier stage in the process. The term cycle stock is also used for the gas oil-like product of catalytic cracking. 

Cycle stock (recycle stock), 23 594 Cyclic belt compounds, preparation of, 13 438-439... 

This paper discusses developments in solvent extraction with emphasis on applications to petroleum fractions in the kerosene and heavier boiling range. Many of these techniques have been extended to the refining of gasoline, Diesel fuels, catalytic cracker feed and cycle stocks, and butadiene. 

Cycle Stock—Unfinished product taken from a stage of a refinery process and recharged to the process at an earlier period in the operation. 

Cycle stock the product taken from some later stage of a process and recharged (recycled) to the process at some earlier stage. 

In general, there are three types of stock to consider. Cycle stock is the regular inventory that is needed to fulfill orders. Buffer, or safety, stock is additional inventory that is needed in case of a supply or demand fluctuation. Anticipatory, or speculative, stock is inventory that is kept on hand because of expected future demand or expected price increase (e.g., flu vaccine in the fall and winter months). Buying anticipatory stock is risky, and therefore, pharmacists usually do not carry much anticipatory stock and place higher markups on such anticipatory stock. These types of stock are important to consider when deciding how much to order and when to order (Silbiger, 1999). 

Inventory management applications should have functionality and supporting SOPs to enable both planned and unplanned cycle stock checks and other stocktaking activities to be easily undertaken — the latter is especially important as it may form part of any product recall activities. This checking may be required to cover stock at several locations, not all of which may be under the direct control of the organization responsible for managing the recall. Coordination is very important. The system should be configured to rotate stock either a First In-First Out (FIFO) or First Expired-First Out (FEFO) basis. 

Hydrotreating is being employed extensively in the petroleum industry for processing a variety of feedstocks. Both straight-run and cracked petroleum products such as naphthas, kerosenes, middle distillates, gas oils (atmospheric and heavy vacuum types), cycle stocks, residues, asphalts, crudes, and shale oils may be so treated. The process primarily is employed as a pretreat previous to catalytic reforming or catal3d ic cracking. 

From example 9 it is known that the pipeline transport is assumed to induce negligible fixed costs such that a continuous supply of both sites minimizes the cycle stocks. Hence, it is concluded that Si = Si + for = 1,2 such that at both sites only safety stocks... 

For supply chains, transportation flows enable products or components to change location, thus enabling them to be used at their demand points. The timing of these transportation flows in turn interacts with transport capacity and chain structure to impact supply chain performance. Given this interaction, the total supply chain impact of a choice of transportation flows has to include transport costs, cycle stock costs, safety-stock costs, and in-transit inventory costs. For each possible transport mode, there are... 

Cycle stock at demand points When demand points receive delivery, the quantity delivered is Q, described earlier. This delivered quantity may be greater than the demand each period. If so, the demand location carries cycle stock, which is the average inventory across successive deliveries. 

Cycle Stock Costs Given the full truckload shipments, the size of the deliveries of each component received by each assembly plant is 3,000 units. In the absence of demand uncertainty at each plant, the next truck delivery would be scheduled when the components in this delivery are consumed. This means that the inventory level cycles between 3,000 and 0 units. The average inventory is thus the average height of a right triangle whose height is 3,000 units 3,000... 

Similarly, the holding cost of the cycle stock of component 2 at Boston is ... 

Thus total cycle stock holding cost across the two components and at the two assembly plants is 2,400/day. 

Total cycle stock holding cost — 1,365.60/day In-transit costs ... 

Note that Chicago receives a shipment of 3,000 units from Santa Fe every ten days and ships out 1,500 units every five days to the east coast. Thus the cycle stock at Chicago during every ten-day cycle is 1,500 units for the first five days of the cycle and zero units for the remaining five days. Thus the average cycle stock of component 1 at Boston is... 

The associated cycle stock cost = 750 X 0.4 = 300/day Chicago (component 2) ... 

Quadrant III. In this quadrant, volume is low and demand error is low. Efficiency in this supply chain can be achieved through advanced planning systems (APS) that utilize the TOC logic. Through the use of the software, these lower volume items can be combined with higher volume product cycles to reduce the impact of constraints and decrease the impact of cycle stock on inventory carrying costs. 

Raw material Cycle stock Inventory required to cycle through the production schedule. 

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