ASSESSMENT: MMA, TAGS AND WELDING ASSESSMENT NO: 6088-06 I/C MMA1 TITLE: Installation of LCS LPHW Heating mains and header LINK: MMA Welding Industrial/commercial 6088 NVQ Level 3 MODULE ORGANISATION PEOPLE WELDING TESTING SAFETY SYSTEMS CODE LETTER (A) (B) (C) (E) (F) (H) BOX NUMBER 1,2,3,5,6,7,8 ,9,10, 11,12,13,14,1 5,16 1,2,4 1,2,3,4,5,6 1,2,3 1,2,3,5,6,7,8 ,9,10, 11,12,13 1 MODULE QUALITY ENVIRONMENT ELECTRICS RECORDS & INFORMATION SITES CODE LETTER (I) (J) (K) (L) (M) BOX NUMBER 1,2,3 1,2 1 1,2,3,4,5,6,7, 8,9,10 1,2,3,4,5 INTRODUCTION: This assessment covers the installation of LPHW heating, distribution header and branch connections. The main purpose of this assessment is to test the candidates competence in working without supervision in the areas of planning, preparation, installation and testing of LCS pipework with MMA welded joints. This assessment should be carried out in a realistic working environment with all the restraints that site work involves. SPECIFICATION: /home/website/convert/temp/convert_html/568bd6511a28ab20349ba28d/document.docLast printed 7/27/2009 09:51:00 AM 1
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ASSESSMENT: MMA, TAGS AND WELDING
ASSESSMENT NO: 6088-06 I/C MMA1
TITLE: Installation of LCS LPHW Heating mains and header
MODULE ORGANISATION PEOPLE WELDING TESTING SAFETY SYSTEMS
CODE LETTER
(A) (B) (C) (E) (F) (H)
BOXNUMBER
1,2,3,5,6,7,8,9,10,11,12,13,14,15,16
1,2,4 1,2,3,4,5,6 1,2,3 1,2,3,5,6,7,8,9,10,
11,12,13
1
MODULE QUALITY ENVIRONMENT ELECTRICS RECORDS & INFORMATION
SITES
CODE LETTER
(I) (J) (K) (L) (M)
BOXNUMBER
1,2,3 1,2 1 1,2,3,4,5,6,7,8,9,10 1,2,3,4,5
INTRODUCTION:
This assessment covers the installation of LPHW heating, distribution header and branch connections. The main purpose of this assessment is to test the candidates competence in working without supervision in the areas of planning, preparation, installation and testing of LCS pipework with MMA welded joints.
This assessment should be carried out in a realistic working environment with all the restraints that site work involves.
SPECIFICATION:
100 mm distribution header and 65 mm branch connections are to be installed in LCS BS 1387 heavy weight pipe. The system has a high level flow and return to a low level distribution header. Jointing of pipework will be:
Manual Metal Are (MMA) welding with general purpose fittings to BS 1965 and welding flanges to BS 459.
All welds to be in accordance with NJIC test specifications.The preparation and testing of MMA and TAGS welded joints should be in accordance with HVAC publication TR 5/6 Welding of carbon steel pipework.All work carried out should have due regard to the HSWA 1974.
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INSTRUCTION:
Candidates are advised to study all the assessment details and drawings for the specified task before starting. Reference sources will need to be consulted for certain aspects of the tasks, the references used should be noted next to your answers. The assessor will be your customer/client or main contractor for the purpose of this assessment.
SECTIONS:
1.1 The following hazards have been identified in the immediate working area:
a. Fire risk from welding processb. Ultra violet light from MMA/TAGS welding processc. Portable; electric hand tools (grinder)d. Personal protection of operatives (PPE)
Under current regulations you the employee have a responsibility to your employer and fellow operatives to state the safety requirements and equipment need to limit the risk level of the four hazards above.
1.3 The fumes from the MMA/GAGS welding process creates specialhazards to the welder if they rely on general ventilation systems. What advice and recommendations would you suggest to overcome this problem.
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1. PLANNING Organising, Records
2.1 Slip on bossed flanges are to be welded to the 100 mm diameter LCS distribution header having a wall thickness of 6 mm. to enable other welder to complete the headers the following information is required by your employer:
a. Sketch the joint setup, showing all dimensions and detail prior to welding.
Answer
b. List a selection of electrode diameters used for this weld and their approximate current values.
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2. PREPARATION: Sites, Records
2.1 Clarification of manual metal arc electrodes BS 639 is important especially on sites were different types of electrodes are used. The client requires a brief explanation of the following:
Reference: Welding Schedule 5.3 may be used as the answers for the above questions, so long as the standards of competency have been reached in the schedule.
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2. PREPARATION: Sites, Records
3.1 This assessment must be installed in position from the fixed heights shown in the working drawing.
b. The installation of MMA welded 100 mm header with slip on bossed flange, fixed butt, horizontal vertical on 65 mm branch with welding elbow, terminating on the flow with a screwed flange. A horizontal vertical on the branch pipe must be welded in position using the MMA welding process. Please note the 100 mm slip-on boss flange may be welded off-site.
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3. DOING: Installation, Records
4.1 On completion of the installation all mechanical and welded joints must be tested in accordance with HVCA publications TR 5/6 , Welding of Carbon
Steel and Site Pressure Testing of Pipework.
This to include hydraulic pressure test, bend tests, macro etching and visual examination
For future reference you are required to record the results of your testing on the form provided drawing.
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4. FINISHING: Testing, Commissioning
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16 2
3
4
5
1195
1040
450
Weld No
1
2
3,4
5
6
Description
100mm fixed but
65 mm ONTO 100mmm vertical branch
65mm Horizontal Vertical
65mm Fixed Butt
Slip on boss flange onto 100mm pipe
Detail drawing of pipework Pipe installation all measurements are approximate.
Drawing not to scale
TEST CERTIFICATE
OPERATIVE’S NAME:
CLIENT’S NAME:
DATE OF 1ST TEST: DATE OF 2nd TEST
SYSTEM WORKING PRESSURE: Bar TEST PRESSURE: Bar1½ times maximum working pressure
TEST DURATION: Minutes
WELD NUMBER COMPETENT
ACTIONS/OBSERVATIONS
1. Fixed ButtBend Tests
a) Top b) Side c) BottomVisual
a) Penetration b) Appearance2. Branch
Macro Etcha) Crotch
b) FlankVisual
a) Penetration b) Appearance3. Horizontal/Vertical Bend Test
a) Stop & Start b) Directly OppositeVisual
a) Penetration b) Appearance4. & 5. Weld-on Elbow Subject to visual Examination6. Slip-on Boss FlangeSubject to visual Examination
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KNOWLEDGE ASSESSMENT
Answer all the questions in the assessment. Please circle the appropriate answer after carefully reading each question.
1. Which ONE of the listed articles of legislation applies to all places of work?
a) Electricity at Work Regulations 1988b) Gas safety (Installation & Use) Regulations 1998 c) Part P of the Building Regulations 2000d) Electricity Supply Regulations 1988
PC: 9.1 (All)
2. What MINIMUM period of time must elapse after an acetylene cylinder has been up righted from the horizontal position before being used?
a) 120 minutesb) 90 minutesc) 60 minutesd) 30 minutes
PC: 9.2.1; 9.2.2; 9.2.3; 9.2.6
3. What Grade of BS 1387 LCS tube is best suited to jointing by the welding process?
a) Heavy – red bandb) Medium – blue bandc) Heavy – blue bandd) Medium – red band
PC: 9.1.5
4. What preparation technique is necessary after flame cutting LCS tube before carrying out welding?
a) Painting with oxide paintb) Application of a fluxc) Removal of oxide coatingd) None required
PC: 9.1.1 to 9.1.6
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