In order not to use the phrase "please raise" or "please raise your salary," better use "Please consider a pay raise ...". This formulation sounds decent, adjusts on a business footing.
Be sure argues why the salary increase in your situation reasonably. List your responsibilities and note that the workload has increased significantly due to, for example, attracting new customers, increasing sales or withdrawal of any employee. Appeal to the figures compare as increased performance of the department in recent years. Try not to overdo it with a description of how hard you work, or guidance would consider to hire additional staff.
Do not use as a justification for arguments such as "I learned that the accounting staff Petrov raised the salary" or "manager Ivanova gets more." Firstly, you are not concerned, and secondly, the management deems fit.
In the text of the statement, specify the amount of allowances to which you want to, in this case, the management does not have to search for information about your salary. But be prepared for the fact that you gain the desired 10 000 one stroke of the pen can turn into 5000.
Enlist the support of the immediate supervisor, ask him to endorse the statement and write succinct "no objection". Perhaps your boss take the initiative and write what you really deserve the salary increase.