Section 15090 EXPANSION JOINTS

Section 15090

EXPANSION JOINTS

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. This Section specifies piping expansion joints.

1.2 QUALITY ASSURANCE

A. Comply with the current provisions of the following Codes and Standards.

1. Commercial Standards

ASTM A276 Stainless and Heat-Resisting Steel Bars and Shapes

EJMA STDS Standards of Expansion Joint Manufacturers' Association, Edition No. 5

B. Performance and Service Conditions: Expansion joints shall be designed in accordance with EJMA Standards for pressure, temperature and service as specified.

C. Design Requirements: Expansion Joints - Corrugated type expansion joints shall be suitable for a minimum of 10,000 pressure, temperature and deflection cycles (non-concurrent).

1.3 PRODUCT DATA

A. The following information shall be provided to the Resident Project Representative in accordance with Section 01300:

1. Design and construction details of formed metal bellows type expansion joints.

2. Pressure thrust force and spring rate data for formed metal bellows expansion joints.

3. Details for installation of all expansion joints.

PART 2 - PRODUCTS

2.1 EXPANSION JOINTS

A. Metal Construction

1. Formed Bellows Type

a. Medium Temperature

(1) Formed bellows type expansion joints for temperatures up to 800 degrees F shall have 300 series stainless steel multi-ply bellows rated for the specified design temperature and pressure. Test pressures are specified in Section 15050. Each expansion joint shall be factory tested at the test pressure. Ductwork expansion joints may be rated at less than 50 psig but must be rated equal to

the design pressure and, in no case, less than 2 psig. Engine and gas turbine exhaust expansion joints shall be as specified in Paragraph 15090-2.1 A.1.b.

(2) Expansion joint design shall be determined by the amount and kind of movement specified (axial, lateral, angular). Unless otherwise specified, end connections shall be flanged. Formed bellows type expansion joints shall be as manufactured by Flexonics, Inc., Hyspan Precision Products, Inc., American BOA Inc. or equal.

b. High Temperature: Engine and gas turbine exhaust expansion joints for temperatures up to 1300 degrees F shall be the multi-ply bellows type designed for 15 psig. Bellows shall be constructed of 300 series stainless steel. Unless otherwise specified, end connections shall be either the fixed flange or Vanstone flange configuration. Flange material shall be carbon steel for temperatures up to 1,000 degrees F and stainless steel for temperatures 1000-1300 degrees F. Vanstone materials and flow liners, where specified, shall be the same as bellows material. Exhaust expansion joints shall be Flexonics DEX Series, Hyspan Series 2500, American BOA Series 025E, or equal.

2. Steel Expansion Compensator Type: Steel expansion compensator type expansion joints shall be Flexonics Model H Expansion Compensator, Hyspan Series 8500, Keflex 7Q, or equal. Compensators shall have 2-ply stainless steel bellows and carbon steel shroud and end fittings. Compensators shall be rated for 175 psi maximum working pressure and 750 degrees F.

3. Bronze Expansion Compensator Type: Bronze expansion compensator type expansion joints shall be Flexonics Model HB Expansion Compensator, Hyspan Series 8500, Keflex 7Q, American BOA Inc., or equal. Compensators shall have multi-ply phosphor bronze or stainless steel bellows and copper tube end fittings. Compensators shall be rated for 150 psi maximum working pressure and 400 degrees F.

B. Elastomer and Fabric Construction

1. General

a. Elastomer and fabric expansion joints shall be the standard spool arch type or the precision molded spherical design type as indicated or specified. Expansion joint connectors shall have control units (restraints) to prevent excessive axial elongation and to accept the static pressure thrust in the piping system. Number and sizes of control rods or restraints shall be as determined by the manufacturer. Unless otherwise specified, single arch and sphere type expansion joints shall have 6-inch face-to-face dimension for pipe up to 8 inches and 8-inch face-to-face dimension for pipe 10 and 12 inches.

b. The cover elastomer shall be chlorobutyl, neoprene or EPDM. For temperatures between 180 and 240 degrees F, the tube elastomer shall be chlorobutyl or EPDM. Neoprene or Buna N liners are acceptable for temperatures to 180 degrees F.

2. Spool Type

a. Spool type expansion joints shall be of the resilient arch type and shall be standard or tapered as specified. Unless otherwise specified, all tapered connectors shall be eccentric.

b. Spool type expansion joints shall be constructed of multiple plies of woven fabric impregnated with elastomer and reinforced with steel rings or wire embedded in the body. Standard arch type expansion joints suitable for the specified temperature and pressure shall be provided with retaining rings or backup rings. Retaining rings shall be 3/8-inch thick steel, split, either galvanized or zinc shield coated. Expansion joints, single, multiple, or filled arch, shall be Mason Style EJBN, Garlock Style 204, Mercer Style 500, Goodall Style E-1462, General Style 1025, or equal. Filled arch type shall be used on all piping systems carrying fluids containing solids. High pressure couplings suitable for 240 degree F operating temperatures shall be Mason Style EJBN-HD, Mercer Style 510, Garlock Style 204-HP, Goodall Style E-1489, General Style 1015, or equal.

3. Spherical Molded Type: Spherical molded type expansion joints shall be precision molded of multiple plys of nylon tire cord fabric and elastomer suitable for specified temperature and pressure. Spherical molded type expansion joints shall have steel or ductile iron floating flanges, and no metal parts shall come in contact with the fluid. Single sphere molded connectors shall be Mason Type MFNC, Mercer Type

5500, Goodall Type E-611, General Type 1010, Garlock Style 8100, or equal. Double sphere or triple sphere connectors shall be provided where required to provide for the specified movement.

C. Polyvinyl chloride Construction: Polyvinyl chloride expansion joints shall be Celanese "Chemtrol" CPVC slip type with Teflon impregnated seal rings, Certain-teed Fluid Tite PVC, Johns-Manville PVC double bell expansion joint, or equal.

D. Teflon Construction: Teflon expansion joints shall be molded TFE bellows and shall be

Metraflex T-2, Garlock Style 215, Resistoflex R-6905, EGC Style M-150, or equal.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Expansion joints and anchors shall be located as specified. Location and number of guides shall be determined from EJMA Standards.

B. Expansion joints shall not be installed during times of temperature extreme or in a fully compressed or fully expanded condition.

3.2 ALIGNMENT

A. Piping systems shall be aligned prior to installation of expansion joints. Expansion joints shall not be used to correct piping misalignment during installations. Expansion joints normally preset at the factory for rated axial compression and expansion shall be installed in this preset condition.

3.3 EXPANSION JOINT AND CONNECTOR SCHEDULE

A. Expansion joints provided for specific equipment items or piping systems are specified on the following schedule. The location of piping system expansion joints and design criteria, including temperature, pressure and movement for each joint, are specified on the drawings.

Expansion Joint and Connector Schedule

Type of Expansion Joint/Connection Type of Service/Use

END OF SECTION