**Responses to technical questions on RFQ 554-74233-912**

After receiving questions, the technical representative is clarifying
the output connection specification. It should read:

INPUT CONNECTION= 1.5" Conflat Stainless Steel with adapter from 1.5"
conflat to KF25 Stainless Steel.

1\) Is the LN trap to be automatic fill? NO

2\) If not automatic fill what is hold time desired. 6-8 HOURS.

3\. Is the pumping station to be attached directly to and be supported
totally or in part by other equipment? NO

 

4\. What is the desired configuration of the inlet termination? e.g.
base plate, ISO flange or con flat flange. 1.5" CONFLAT

 

5\. The pump flow rate of 350L/S pumping speed is for what gas?
Nitrogen, Helium, or Hydrogen? NITROGEN

 

6. Because an output connection (I assume this is the outlet of the
turbo pump.) size of KF25 has been specified, is a mechanical pump to be
included in the offer and if so, is it to be a dry type pump?

INLET TO PUMP IS 1.5" CONFLAT AND A DRY ROUGHING PUMP IS TO BE INCLUDED

 

7\. Is an isolation valve required for the inlet of the high vacuum
pumping train? YES

 

8\. Has the presence of an optically dense liquid Nitrogen cold trap
been taken into consideration in determining the pumping speed
specification of 350L/S.

THE PUMPING SYSTEM SHOULD REACH 10^--9^ WITH A COLD TRAP IN OPERATION.
IT IS NOT NECESSARY FOR THE PUMP SYSTEM TO REACH 10^--9^ IF THE COLD
TRAP IS NOT FILLED.

 

9\. Has the inlet flange of the TMP pump been determined or should we
offer a standard configuration? 1.5" CONFLAT

10\. Is there a preference to the backing pump capacity? NO

11\. It there a preference to the type of gauging?  Is it necessary for
a localized readout?

GAUGES SHOULD BE ON PUMP PANEL.

12\. Is the main power voltage defined?  110/1/60? or something else.

MAIN POWER SHOULD BE 110/1/60

13\. Can you define \"Fully automatic from atmosphere to high vacuum
with interlock protection\".  Should there be any provision for a
automatic restart upon power loss or should there be a manual restart
after resuming power?

MANUAL RESTART AFTER POWER LOSS

14\. What type of cold trap are you considering; an open cycle or closed
cycle?

EITHER ONE IS ACCEPTABLE

 

15\. Do we need to provide a backing pump as well? If so, oil free or a
mechanical type pump?

BACKING PUMP IS REQUIRED, OIL FREE.

16\. What type of inlet flange does the turbopump need to have? 1.5"
CONFLAT

 

17\. Will the turbopump be exposed to corrosive or reactive gases? NO

 

18\. Will the turbopump be mounted in any orientation other than
vertical, under the vacuum chamber? NO

 

19\. What type of mechanical pump would you like: Oil flooded or Dry?
DRY

20\. You asked for a cold trap. Will this be placed above the turbo to
reduce base pressure, or will it be placed between the mechanical pump
and the turbo? BETWEEN

21\. Chilled water or LN2? LN2

22\. No mention of gauging was referenced too. Shall we include a
thermocouple gauge for rough vacuum and a ion gauge for high vacuum? YES

23\. If the base pressure of the pump is 1x10-9 torr reducing the inlet
to NW25 will reduce the inlet pressure and pumping speed .. Has this
been taken into consideration?

INLET TO THE TMP IS TO BE 1.5" CONFLAT. IGNORE REFERENCE TO KF-25.

24\. What is the high vacuum flange requirement for the turbomolecular
pump

1.5" CONFLAT

 

25\. Where is the cold trap to be placed.  Above the turbopump or
between the turbopump and the roughing pump?

BETWEEN THE TURBOPUMP AND ROUGHING PUMP

26\. What size roughing pump is requested to go with this turbopump.  If
no specific size is required, then I am assuming that the minimum size
required for the turbopump to operate to meet the other specifications
is adequate. YES, MINIMUM SIZE.

27\. What kind of a cold trap our you looking for - LN2 or water?

LN2 6-8 HOURS.

28\. Where do you want the cold trap - between the roughing pump and the
turbo

pump, or at the outlet of the turbo pump?

Normally if it is between the roughing pump and the turbo pump the trap

would be a molecular sieve trap.

BETWEEN TURBO PUMP AND ROUGHING PUMP, NO SIEVE TRAP

29\. I just wanted to confirm that that the output of your system would
be an

NW25 connection.  This is very small for a 350 l/s pump and would reduce
the

pumping speed significantly.

REQUIRE INPUT TO PUMP TO BE 1.5" CONFLAT FLANGE

30\. Can the user specify what type and size of inlet flange, and if any
location\
other than the top of the system is required?

1.5" CONFLAT, LOCATED IN TOP OF SYSTEM

31\. We assume that \"outlet, KF-25\" is, indeed, the exhaust connection
from the forepump, not the inlet.

IGNORE REFERENCE TO KF-25

32\. The cold trap, unless otherwise specified, will be a manual-fill,
6-8 hour trap, and that there will be HV valve between the trap and the
to-be-specified inlet flange.

YES

33\. Is the unit to be installed in a clean room with construction
material restrictions?

NO

34. Since the system is meant to be portable, does the user want 120Vac
    operation, or is 220 ok? 120 VAC IS REQUIRED

35. The specified base pressure is fairly low, so the practical base
    will depend very much on what is connected to the system and where
    the pressure is measured. Without other direction, we assume that
    the pressure is measured in the throat of the system below a
    blanking plate. The user may want the gauge to measure the chamber
    instead,\
    and if so, may specify a mounting flange.

PRESSURE IS MEASURED IN THROAT OF SYSTEM