NRC
Addendum/Addenda No.: 3
Project No.
M50-5046
Mechanical Drawing:
5046-M03:
Schedule: Piloted Operated Steam Pressure Relief Valve (SRV)
Change: Piloted Operated Steam Pressure Relief Valve (SRV)
To: Steam Pressure Relief Valve (SRV)
Capacity at set pressure:
Change: 24,419 lb/hr
To: 38,283 lb/hr
Orifice Size:
Change: 6.692 in^2
To: 11.50 in^2
Body Material:
Change: Cast Iron
To: Carbon Steel
Option to be included:
Change: External Lift Leaver
To: Field Test Connections
Change: Exposed Spring
To: Modulating
Add: Teflon Seat, Factory Mounted Pilot
Page 1 of 3
Standard of Acceptance:
Change: APOLLO, SERIES 119, - ASME SECTIONS VIII
To: Farris, Series 3800 (Model: 384T10)
Add Note: Selection of SRV is based on a total Cv of 4.37 per PRV. Changes to SRV size and
related piping as required to suit alternate PRV selection shall be at contractor’s
cost. Provide drain pad to suit SRV.
NRC
Addendum/Addenda No.: 3
Project No.
M50-5046
Page 2 of 3
Schedule: Steam Pressure Reducing Control Valve
Main Body
Add:
Rangeability: 50:1
Sound Output: Maximum sound rating: 91 dB(A) at 7,500 lb/hr and 100 psig inlet and
50 psig outlet.
Air Regulator/Filter
Add:
To be complete with inlet and outlet factory mounted pressure gauge.
Notes:
Add:
Gauge transmitter: Accuracy +/- 0.075%, Stability: +/- 0.1% of URL for 3 years, Process
connection: ½” NPT, Output: 4 to 20mA dc with HART Protocol, C/W
Calibration certificate (5 points), Adjustable range : -14.7 to 800 psi
Schedule: Pressure Gauges (PG-#):
PG-1 to 3
Case Material:
Change: T.P
To: S.T
Dial Size:
Change: 115mm
To: 100mm
Maximum System Pressure (oC)
Change: 150
To: 93
Delete: Maximum Short Term Temp. (oC)
Change: Connection (F-NPT)
To: Connection (NPT)
PG-1
Gauge Dual Scales: PSIG (kPa)
Change: 0-125
To: 0-160
PG-1 and 3
Gauge Dual Scales: PSIG (kPa)
Change: 0-125
To: 0-160
PG-2
Gauge Dual Scales: PSIG (kPa)
Change: 0-100
To: 0-60
NRC
Project No.
M50-5046
Addendum/Addenda No.: 3
Page 3 of 3
Specifications:
Section 21 07 19: Thermal Insulation For Piping
Article 3.5.3
Change: Thickness of insulation as listed in following table.
To: Thickness of insulation listed below.
Article 3.5.3.2.1
Change: Inside Building: 75mm
To: Inside Building: 75mm (Two 37.5mm thick layers)
General:
Acceptable Alternates:
Steam Control Valve: Spirax Sarco
Steam Traps: Armstrong
Steam Pressure Relief Valve (SRV): Spirax Sarco, Apollo and Consolidated
Strainers: Armstrong
Note: It is the contractor’s responsibility to ensure that all material and equipment meets
and/or exceeds the requirements of the specifications. Final acceptance or rejection of
all equipment and material will occur during shop drawing review.