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Technical Review Required:

Technical Review Required:

1. Industry codes and standards to which the pump must be designed, constructed, and tested. It is also possible to create a technical specification that stands alone and does not reference (or minimally references) codes and standards. This stand-alone technical specification will require a more thorough listing of needed requirements than one that references common design, fabrication, and testing standards.

2. A list of desired deviations and preferences from the main technical standards used to help define the pump requirements.

3. A definition of any technical terms used in the specifications that are not defined in referenced standards. This will help prevent misunderstandings between the purchaser and pump vendors.

4. A list of documents to be submitted by the successful bidder, both with the quotation and after the order is placed.

Pump Data Sheets As stated previously, a data sheet is used to list specific requirements for each individual pump service. These requirements are not general enough to be listed in the technical specification. Each pump service requires its own data sheet. As a minimum, the following items must be included on the data sheets for each service:

1. Pump name and item number

2. All required system design conditions and pump performance values needed to fully define the pump operating requirements, including any known turndown, start-up, or upset conditions

3. Materials of construction (unless the vendor is free to recommend standard materials)

4. All accessory requirements (unless the vendor is free to offer the standard selections) such as driver, coupling, seal, and packaging needs

5. Utility conditions available

6. Intended site location and annual environmental conditions in this location

7. Electrical hazardous area classification

8. Instrumentation and control requirements (usually out of the vendors scope)

9. Noise requirements

10. Any specific preferences that deviate from requirements of the technical specifications

11. Inspection and testing requirements

In addition, the vendor should be advised to fill in the applicable blanks in the data sheet and submit the proposal. The manufacturer's data will help define the offering. See Figures 4a to 4e for the API-610, 8th edition, data sheet.

Other Requisition Documents and Requirements A purchaser may include many additional options in the bid requisition. These requirements may be included in the requisition narrative or data sheets. Some possible options are addressed in the following paragraphs.

Alternates It is extremely difficult for a specification to cover all possible pumps offered by various manufacturers. In addition, the pump industry constantly updates their products due to competition and revisions to industry standards. Because of this, it is good practice to allow manufacturers to offer alternatives to the specified pumping equipment. This allows manufacturers to present their best offerings and gives the purchaser the advantage of obtaining commercially and technically attractive alternate offerings. However, the choice of whether to accept an alternative is retained by the purchaser.

Energy Evaluation The purchaser may choose to include operating costs in the equipment evaluation. If so, the vendor needs to be informed of this requirement so the most

FIGURE 4A API 610 data sheet, page 1 of 5 (Courtesy American Petroleum Institute)

attractive proposal can be offered. In this case, the overall equipment cost will be a combination of first cost and the differential cost of energy used over a specified period of time.

This evaluation is often calculated to a cost per horsepower penalty that includes all economic factors. If so, the vendor must be informed of the present worth payback time for this analysis (such as three years), cost of a unit of energy, and the number of hours per

FIGURE 4B API 610 data sheet, page 2 of 5 (Courtesy American Petroleum Institute)

year that the equipment will operate. Based on the differential power consumed over the payback period and the energy cost of this differential, the penalty or credit can be easily calculated. (See Table 1 for an example of utility cost comparison.)

Life Cycle Cost Evaluation A more sophisticated Life Cycle Cost (LCC) evaluation method is starting to gain acceptance in the industry. Traditionally, cost evaluations have

FIGURE 4C API 610 data sheet, page 3 of 5 (Courtesy American Petroleum Institute)

been limited to the cost of the initial capital equipment plus some evaluation for the cost of energy. LCC evaluations include the following major cost categories:

• Purchase price of the pump set (including pump(s), motor, motor starter, and so on)

• Placement cost (includes installation costs such as foundations, electrical installation, piping, isolation valves, and so on)

• Energy cost (usually electricity because most pumps are driven by electric motors)

API 610, 8TH EDITION CENTRIFUGAL PUMP DATA SHEET SI UNITS / ISO STANDARDS (12 2)

REQ / SPEC NO. _ PURCH ORDER NO. INQUIRY NO. REVISION _

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