Section 8 — Heat Transfer Equipment

Deaerating Feedwater Heater

IPE Engineering Practice IPE-EP-8-3-2

Document number: IPE-EP-8-3-2 · Section: 8 — Heat Transfer Equipment

SCOPE

• This Practice covers the design, fabrication, and performance requirements of deaerating feedwater heaters, their attached storage tanks, and auxiliary equipment.
• The Manufacturer must supply a base bid quotation that meets this Practice. Alternate bid(s) may be submitted, provided the performance specifications outlined in paragraph 4.2 are met. All deviations of the alternate bid(s) from this Practice must be noted.
• This Practice should by used in conjunction with the Deaerating Feedwater Heater Data Sheet, EP 8–3–2 DS (to be completed by ), and the Deaerating Heater Manufacturer Data Sheet (to be completed by the Manufacturer). In cases of conflict between Data Sheets and the Practice, the Data Sheets take precedence.
• An asterisk (*) indicates that a decision by the Purchaser is required, or that additional information is furnished by the Purchaser.
• Any deviation from this Practice must be approved by the procedure described in EP 1–1–3.
• A revision bar indicates all changes made to this Revision.

STANDARDS AND CODES

• All material and equipment shall be built to conform to the most current Federal, State, and Local governmental requirements and the following Practices:

STANDARDS AND PUBLICATIONS

• Any differences between this Practice and standards referenced in Paragraph 2.1 must be resolved with the Owner, in writing, by the vendor.

DEFINITIONS

• Manufacturer – The recipient of a direct or indirect purchase order for materials and/or equipment. In this context, a direct order is one issued to a Manufacturer by a Contractor or the Owner. An indirect order is one issued to a Manufacturer by a vendor (recipient of a direct order) for materials, fabricated components, or subassemblies.
• Owner – Inflection Point Engineering, LLC.
• Owner’s Engineer – A Inflection Point Engineering, LLC appointed engineer.

SERVICE CONDITIONS

• The deaerator will not be protected from the weather at the plant site. It will be installed in an exposed, elevated location.
• Deaerated water flow will be subject to wide, rapid changes, as well as extended steady state conditions.
• The design of the deaerator shall provide protection to its internals under abnormal operating conditions, such as turbine trip–out, full load rejection, and other rapid load fluctuations and pressure reductions which may cause stored water to flash or subject the water distribution system to external pressure.

DESIGN CONSTRUCTION AND MATERIALS

• General

The equipment shall be free from defects in material and workmanship.

• Vessels
• The deaerating and storage vessels shall be in accordance with EP 7–1–1.
• The deaerator shall be fabricated from SA 516 Grade 60, and shall be post weld heat treated.
• The deaerator shall be a pressurized unit designed to withstand full vacuum.
• Connections required for admission of condensate, makeup water, steam, boiler feed pump recirculation, removal of vent gasses, chemical injection and withdrawal of deaerated water shall be provided.
• Provision shall be made by the vendor for connection of the following items (instruments furnished by others):
• Liquid level gauges/glasses to cover full operating range
• Overflow control
• Loop seal overflow
• Liquid level control
• Dial pressure gauges for steam space
• High and low water level alarm switches separate from other level transmitters
• Bi–metal type dial thermometers for steam space and water outlet

• The deaerator and storage vessels shall be designed to be bolted together in the field. Prior to shipment, the deaerator shall be bolted to the storage tank to insure proper alignment of the interconnection nozzles.
• Insulation will be provided by others.
• Internals
• (*) Deaerator will be of a spray or tray type, as specified in the Data Sheet.
• (*)All internal welded parts of the heater coming in contact with corrosive gases or nondeaerated water are to be constructed of stainless steel, AISI Type 304 or Type 304L for welded parts, unless otherwise approved by the Owner’s Engineer.
• The tray section shall be so designed that the pressure shell is not subject to contact with nondeaerated water or concentrated noncondensable gases.
• Internals shall be of such a size and weight that they can be easily handled by one man.
• Individual trays or spray nozzles shall be interchangeable.
• Trays shall be AISI type 304 stainless steel, which shall be of one piece formed construction with no riveting or welding. Trays shall not require wedges or other means to hold them in position. Nozzles shall be 304 stainless steel.
• The deaerator shall be equipped with an internal vent condenser of 304 stainless steel to minimize loss of steam through venting.
• Accessories

The following accessories shall be furnished by the Manufacturer:

• Vortex breaker at deaerated water outlet
• Safety relief valves
• Insulation clips
• Davits for all manways
• Lifting lugs, as required
• Process Requirements
• The deaerator will deaerate the make–up water and condensate for all loads between 5% and 100% of the design capacity to provide:
• A free carbon dioxide content of zero ppm when tested in accordance with the latest revision of ASTM D513.
• A dissolved oxygen content of less than 0.005 ml/I when tested in accordance with the latest revision of ASTM D888, Referee Method A (Colorimetric–Indigo Carmine).
• The deaerator will heat the make–up water and condensate to the temperature of saturated steam corresponding to the steam pressure within the heater.
• The deaerating heater will operate noiselessly, without rumble, water hammer, or vibration, at all loads from 5% to 100% of the design maximum.
• The deaerator shall have uncontrolled condensate return. Automatically controlled makeup water flow from the water treatment plant will maintain normal operating level in storage tank.

COMMISSIONING AND PERFORMANCE TESTS

• Commissioning
• The Owner may require the vendor to supply experienced field supervision during commissioning of the deaerator. This may include installation, field inspection, start–up and performance trouble–shooting.
• The vessel shall be chemically cleaned and passivated to remove all scale prior to commissioning, per EP 14–1–4.
• Performance Test
• (*) As soon as possible after satisfactory commissioning, the performance of the deaerator shall be tested to determine if it meets the specified requirements. The test conditions shall be agreed upon by the Owner and the Manufacturer.
• (*) The performance test will be performed by the Owner. The Manufacturer will be able to provide a participant–observer for the test.
• The quality of the deaerated water leaving the head (deaerating section), and the storage tank shall be determined over a period of at least one hour after reaching stable conditions for each test flow rate.
• Should the deaerator fail to meet the specified requirements within the guarantee period, the Manufacturer shall, at the Owner’s option, do one of the following:
• At the Manufacturer’s expense, in the minimum practical time and at the time needed, make all necessary replacements and repairs to place the problem areas in a state of proper materials and correct workmanship. And, do any other work required to assure that similar areas are in the same good condition.
• Reimburse the Owner for actual costs for doing the above.

DATA SHEET AND DOCUMENTATION

• (*) The Deaerating Feedwater Heater Data Sheet per EP 8–3–2 DS shall be completed along with the Pressure Vessel Data Sheet, see EP 7–1–1 DS, by the Owner’s Engineer.
• (*) The Manufacturer shall complete the Deaerating Heater Manufacturer Data Sheet. The completed Data Sheet shall be returned to the Owner’s Engineer for review and approval.
• (*) Unless otherwise specified by the Owner’s Engineer, the Manufacturer shall supply complete equipment manuals. These manuals shall include installation, operation and maintenance directions and data.

SPARE PARTS

• Within six weeks of receipt of the purchase order, the Manufacturer shall provide a complete list of recommended spare parts. This list will be based on the total purchase order.
• The complete spare parts list shall include parts location diagrams or drawings.
• The Manufacturer shall supply a listing of spare parts that are recommended to be on hand during start–up of the deaerator and the first year of operation.

PACKAGING AND SHIPPING

• Packaging and shipping shall be in accordance with EP 7–1–1.
• Prior to sealing of the openings, desiccant bags shall be distributed in the vessels for temporary corrosion protection and the number of bags installed shall be plainly indicated on the outside of the vessel.

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