What is a Blanket PO, for what are we using it and has it an expiration date?

Blanket purchase orders are used for the acquisition of assorted commodities or services from a known vendor for departments that have predictable but varied program needs. The range of commodities or services covered by the blanket purchase order should be defined as narrowly as possible. Blanket purchase orders may not be used for the acquisition of equipment or appliances. Blanket purchase orders have a maximum duration of one year and, regardless of the date of initiation, will expire at the end of the fiscal year in which they were initiated.

Blanket PO are issued by the buyers to the suppliers for:

• For recurring needs of consumables items.
• Taking advantage of negotiated price over a long period of supplies.
• To get the supplies over  predetermined delivery dates to save upon he costs of storage.  

Thanks for the invitation

Good question

Agreed with both answers given by

Mr.:Rehman & Mr.:Yakoub abdallah as well too

blanket order is a contract which is fixed for a specific time period in fixed price.