The purpose of this organization is as follows:

1. To facilitate the interchange of information
2. To promote the advancement of the state of the art
3. To disseminate technical information
4. To educate in the areas of modeling, simulation, optimization, transient flow, multi-phase flow and all related subjects as applied to gas, liquid, and solids gathering, processing, transmission, distribution, utilization, and all related activities.

Membership shall be available to any individual interested in furthering the goals of the organization. Membership may be established by paying the registration fee for an annual meeting. Classes of membership may be established from time to time. Membership may be terminated by PSIG in the following ways:

• Any member may be removed from membership upon failure to be represented at least once during three consecutive annual meetings.
• Any member may be removed from membership by request of that member.
• Any member may be removed from membership by failure to respond to any periodic mailing list update review request.
• Any member may be removed from membership by failure to report a change of address, resulting in return of PSIG mailings.
• Any member may be removed from membership for cause.

1. Time: Annual meetings of the Members of PSIG shall be held at a time and location determined by the Executive Council. Special meetings of the Members may from time to time be held during the year at a time and location determined by the Executive Council.
2. Notice: Written notice of the annual meeting or a special meeting shall be mailed to members of PSIG at least 30 days prior to the scheduled start of the meeting.
3. Quorum: A quorum shall consist of the members present at any duly called meeting.
4. Votes: Each member present at a meeting shall have one vote in all voting matters. Proxy votes will not be allowed. A majority of the votes cast shall be required on all questions and for the election of officers and members of the Executive Council.

1. Selection: The officers of PSIG shall be chosen by the members and shall consist of a Chairman, Vice-Chairman, Secretary, and Treasurer.
2. Term: Officers of PSIG shall be elected to terms of two years and shall hold office until their successors are chosen and qualified in their stead.
3. Duties: The officers shall have the following duties:
   1. The Chairman shall preside over all meetings of PSIG. In the inability of the Chairman to preside, the Vice-Chairman shall preside in his place.
   2. The Vice-Chairman shall perform the duties of the Chairman in the event of his absence or inability to serve. He shall carry out other duties as delegated to him by the Chairman, and the Board of Directors.
   3. The Secretary shall record the minutes of all meetings. The Secretary shall also maintain a mailing list of members and send out notices to the members.
   4. The Treasurer shall keep, or cause to be kept, full and accurate accounts of receipts and disbursements and shall deposit, or cause to be deposited, all monies and valuable effects in the name of and to the credit of PSIG in such depositories as may be designated by the Executive Council. The Treasurer shall cause to be paid all valid invoices and debts according to an approval procedure which shall be set by the Executive Council. The Treasurer shall prepare, or cause to be prepared, periodically, a full statement of the finances of PSIG and perform other such duties as may be conferred on him by the Executive Council.

1. Responsibility: The Executive Council shall direct all activities of PSIG which shall include the following duties:
   1. Set the time and place for meetings of the organization.
   2. Develop an agenda for each meeting.
   3. Establish classes of membership as necessary.
   4. Approve registration fees and other charges on the membership.
   5. Approve all payments necessary in the conduct of the business of PSIG.
   6. Provide nominations for Officers and Executive Council members as necessary.
2. Membership: The Executive Council shall consist of the Chairman, the Vice-Chairman, the Secretary, the Treasurer, the immediate Past Chairman, and at least one member at large.
3. Meetings: The Executive council shall meet from time to time at the call of the Chairman or upon the call of a majority of the Executive Council members at a location to be determined by the Chairman.
4. Notice: Members of the Executive Council shall be notified by the Chairman of all meetings no later than seven days prior to such meeting.
5. Quorum: Three members of the Executive Council shall constitute a quorum for the transaction of all business at any such meeting.
6. Term: Members of the Executive Council shall be elected to terms of two years and shall hold office until their successors are chosen and qualified in their stead.
7. Vacancy: In the event that a vacancy occurs in an officer position, the Executive Council may select a successor to complete his predecessor’s term of office. The Executive Council may also select members at large to the Executive Council to serve until the next Membership election.
8. Voting: All votes shall be oral unless a written ballot is requested by a member of the Executive Council. A majority of the Executive Council members present at such meeting shall be required on all questions
9. Conduct of Meetings: The Chairman shall preside over all meetings of the Board of Directors. The Vice-Chairman, in the absence of the Chairman, shall act in the place of the Chairman. The Secretary shall record the minutes of all meetings.

This is a not-for-profit organization.

Amendments to the by-laws shall be made by a majority vote of the Membership in attendance at an annual or special meeting of the organization.