15703.doc

96-620

00-32 07-733 07-743

SECTION 15703 - STEAM PIPING SYSTEM

PART 1 GENERAL

1.1

WORK INCLUDED

A.

The work governed by this Section includes the steam supply and return piping systems, steam specialties and steam system equipment.

B. Piping and materials for plant steam systems are specified herein.

1.2

SUBMITTAL DATA

A.

See Section 15000 for general submittal requirements.

B.

Provide manufacturer's literature for all products specified in this Section which will be installed under this project.

PART 2 PRODUCTS

2.1

PIPING

A.

Plant steam supply pipe to be Schedule 40ASTM A53/106 Grade B, seamless.

B.

Plant condensate return pipe to be Schedule 80 ATMS A53/106 Grade B, seamless.

C.

Steam Vent Piping

1. Same as for condensate pipe and fittings.

D.

Fittings for Plant Steam Systems

1.

2" and Smaller

a. Black, cast-iron screwed 250 lb fittings complying with ANSI standard B16.4.

b. At contractor’s option, black steel socket weld fittings. ANSI standard B16.11 wall thickness to match pipe.

E.

Valves for plant steam systems shall be as specified in Section 15100: VALVES.

PART 3 EXECUTION

3.1

INSTALLATION

A.

Pipe

1.

Slope steam and condensate down in direction of flow unless otherwise indicated on the drawings.

2.

Install unions and reducers, where required, at connections to all equipment.

B.

Traps

1.

All traps shall be installed with adequate dirt pocket and with trap far enough below coil to provide sufficient head for good drainage.

2.

Install traps with strainer, unions and valves for maintenance. Where trap has internal strainer, also install external one. Provide check valves on lifts.

C.

Relief Vents

1.

Pipe all relief vents to the nearest floor drain. Terminate piping above the drain grate with the piping oriented downwards. Support the piping on stainless steel strut within eight inches of the drain.

3.2

CLEANING

A.

Flush debris and residue from system and treat with a solution of water and trisodium phosphate or other method approved by the project officer. After treating, flush the system again and drain.

1.

System cleaning done in the presence of the Contracting Officer.

B.

All traps and strainers cleaned at completion of job. Any trap permitting steam to pass shall be replaced.

C.

All equipment cleaned on exterior of grease, plaster, paint spatter, etc.

3.3

TESTING

A.

The Contractor to furnish all labor and equipment for testing.

B.

Test Pressures

1.

Any item of equipment or device in the systems that is not designed for the test pressures listed shall be isolated from the system during testing.

2.

Steam and condensate piping shall be tested at 125 psi hydrostatic pressure for a period of one hour and provide absolutely tight.

C.

Any damage occurring as a result of testing, leaks, etc., shall be corrected at this Contractor's expense, such as damaged insulation, painting, ceiling tile, flooring, plaster, etc., or piping or items in system damaged from being exposed to the test pressure.

END OF SECTION 15703

PACKAGE M OUTBUILDING RENOVATION NIH-NIAID RML HAMILTON, MT

STEAM PIPING SYSTEM 15703-4

RML AUTOCLAVE REPLACEMENT ( NIH-NIAID RML ( HAMILTON, MT

STEAM PIPING SYSTEM 15703-2