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MRO Delay Line ICD

Delay Line to Vacuum System ICD INT-406-VEN-0011

The Cambridge Delay Line Team

rev 0.2 18 Jan 2008

Cavendish Laboratory JJ Thomson Avenue Cambridge CB3 0HE UK


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ICD Description
Sub-systems Delay line Vacuum system Org MRAO Owner MF Brief description and preliminary contents Defines the mechanical interfaces on the delay line pipe required to connect to the vacuum system. Should also include electrical interfaces if any are identified. · Vacuum port connection

Specific entry from the ICD N2 Table contained in FDR document:

ICD Number INT-406VEN-0011

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Change Record

Revision Date Authors Changes 0.1 2007-08-10 MF First draft version 0.2 2008-01-18 MF Interface details and drawings added

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Notification List

The following people should be notified by email that a new version of this document has been issued: MROI: Fernando Santoro MRAO: Chris Haniff David Buscher Martin Fisher

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Table of Contents
1 2 3 4 5 6 7 8 9 ICD Description ........................................................................................................................... Change Record ............................................................................................................................. Notification List ........................................................................................................................... Scope ............................................................................................................................................ Acronyms and Abbreviations....................................................................................................... Applicable Documents ................................................................................................................. Introduction .................................................................................................................................. Requirements ............................................................................................................................... Design .......................................................................................................................................... 9.1 Interface description............................................................................................................. 9.2 Interface location.................................................................................................................. 10 Appendix .................................................................................................................................. 2 2 2 3 3 3 4 4 4 4 4 7

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Scope

This document defines the connection between the MROI supplied vacuum system and the port machined into the delay line pipe. Although the MROI vacuum system is described and depicted here it is only a representation and not in any way definitive.

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BCA BCF BRS DL DLA ICD ICS

Acronyms and Abbreviations
Beam Combining Area Beam Combining Facility Beam Relay System Delay Line Delay Line Area Interface Control Document Interferometer Control System (now SCS) Interferometer MRAO Mullard Radio Astronomy Observatory NMT New Mexico Tech OPD SCS TBC TBD Optical Path Delay Supervisory Control System To be confirmed To be determined

Acronyms and Abbreviations

MROI Magdelena Ridge Observatory

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Applicable Documents

DRAWINGS

AD01 MROI-084-03.pdf
REFERENCE DOCUMENTS RD1 Top-level requirements INT-406-TSP-0002 RD2 Delay line to BCF infrastructure (building) (INT-406-VEN-0009)

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Introduction

This ICD describes the connection interface between the MROI vacuum system and the delay line pipes. A vacuum pipe manifold is situated above the delay lines in the DLA area about 1.5m from the outer BCA wall, i.e. There will be a vacuum pipe brought down to each delay line from this manifold which will couple by a flexible connection to an assembly which mounts on the top surface of the delay line pipe. The assembly consists of a gate valve and pressure monitoring devices and is based on a two inch system.

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Requirements

The requirements of the vacuum system that are applicable to the delay line are defined in RD1 and reference to vacuum design features can be found in RD2. The requirements of the interface are for the pipe to accept a standard centring ring together with a means of clamping the ring to achieve an appropriate vacuum seal. The position of the port along the pipe is not critical because of the flexible connection from the vacuum manifold but it should be positioned so that it is reasonably close to the vertical drop from the overhead vacuum pipe.

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9.1

Design
Interface description

The vacuum port is based on a 2 inch feed and connects to a four way cross adaptor specified in the vacuum subsystem. The interface is defined at the pipe which is machined to receive a 2 inch centring O-ring seal, held in position by a specially designed sectional clamp. The arrangement is depicted in Figure 3. A flat surface is machined into the top of the pipe and a hole is bored to receive the centring seal. Blind holes are drilled into the pipe at places where the pipe thickness is preserved and are tapped to receive `heli-coil' inserts. The sectional clamp, which fits around the conical stub of the four-way cross is held in place by three M5 screws on each half and these are tightened so that the centring ring seal is seated and clamped to the pipe.

9.2

Interface location

A plan view of the area of the BCF in which the vacuum manifold is situated is shown in Figure 1. The service pipe from the vacuum system terminates just inside the DLA near the doors into the outer BCA. The vacuum manifold which spans the delay lines is mounted close to the outer wall of the BCA such that the individual drops will terminate at the pipes just clear of the last pipe support stand. The manifold provided by MROI is expected to be 4 inches in diameter and the drop pipes are to be 2 inches in diameter, terminating in the 4-way cross.

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Figure 1: Layout of the vacuum system within the BCF The provisional scheme depicting the arrangement of the vacuum port assembly for one delay line is shown in Figure 2 and a 3-D view of the actual pipe connection is shown in Figure 3.

Figure 2: An exploded view of the proposed assembly which connects to each delay line pipe.

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Figure 3: The interface of the 4-way cross to the pipe port. The location of the vacuum port connection within the DLA is depicted in Figure 4.

Figure 4: Location of the vacuum port with respect the DLA/BCA wall and the last support stand. 6


10 Appendix
The precise interface requirements are captured in the following two drawings extracted from the engineering drawing specified in AD01.

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11

10

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8

7

6

5

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1

H
70 3. 39 n on ep De 0 .0 fer ides 22 m ha w o s M T 00 t ,0 5~C N n 6 x4 s o n b y d 25 0. lace plie p P 5 su Jig

H Nom inal n1 6" O.D. Al pipe with 1/2" wall thickness

5024,0
. .D P.C 6.0 43 n

1572,0 24,00

330,0 152,4

C. P.

G

ON .S. 80 ES E 0, C n1 PLA 10

20,00 G 3.2
b

t 0,25 A
n460,00

2 2,3 n5
n40 6,40

n 41 4, 40

F

0.8

0.8 A SEE NOTE 3

F

t 0,25 A

K
4.40 DEEP FL AT RECESS 76,00

38 ,00 SEE NOTE 1 4 PLACES E

E M 5X0.8 HELICOIL 1D LENGTH 8.00 DRILL DEEP BOTTOMING TAPS 6 PLACES ON B.C. n84.0 0 8.5[1/3]

D

D

K (1:1)
9 .5(12.7) [3/8(1/2)] G C

CHAMFERS ON BOTH PIECES GMAW 60 DEGREE V GROOVE WELD CONTINUOUS WELDING IF POSSIBLE REMOVE OIL, DIRT AND OXIDE BEFORE WEL DING.

C

7,30 DEEP GROOVE

B

Notes: 1. See drawing No. MROI-086. 4 Places. Location of brackets is not critical, but shall be within `1mm in location (longitudinally and circumferencially) and `0.2~ in perpendicularity of the face of the bracket to the normal axis of the pipe (See note 3). M ounting jig will be supplied by NMT. 2. Ends to be machined or ground using some appro priate process for removing scratches and burrs with no longitudinal effects. The chamfers of the inner edges at both pipe ends should not be larger than 0.25x45~. 3. The nominal axis is defined by a line jo ining the centre of each end of pipe.

B

SI A

Materia l: BS1470 6061

Toleran ces :
Ang ula r `0.3 ~

.x `1. 0; .xx ` 0.12; .xxx `0. 05

Dr awn by: XS

Da te: 20/01/08

Quantity: 1 of f for each DL

Dr g. N o. MROI-084- 03

Title:

U niversity of Cambridge, Department of Physic s

Pipe Section 3 MROI
S cale:

A
1:4
S iz e: A1

CAVENDISH LABORATORY 12 11 10 9 8 7 6 5 4 3

Project:

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