W DOC AIRBUS | AMM A320F

Tightening Torques for Pipe Unions (not for OXYGEN Unions)

TASK 20-21-12-911-001-A
Tightening Torques for Pipe Unions (not for OXYGEN Unions)

1. Reason for the Job
This procedure gives the data related to the tightening torques for the unions of these systems:
  • FUEL
  • HYDRAULIC
  • AIR DATA
  • DE-ICING
  • RAIN PROTECTION
  • EXTINGUISHING
  • PRESSURIZATION
  • WATER
  • WASTE WATER
  • AIR CONDITIONING
  • INERT GAS GENERATION SYSTEM (IGGS)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TASK 20-23-11-917-001-A
Tightening Practices for Hydraulic Connections
F Rigid Pipe - Typical Connection
F Flexible Hose - Typical Connection
F Identification of Materials in Hydraulic Line End-Fittings or Unions
F Tightening Torques for AN Unions
F HARRISON and PERMASWAGE Connection
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Caps/Plugs, the Two Parts Made of CRES or Titanium
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
F Flexible Hose Connection
F In-line Check Valve Connection
F Plug-in Union Connection
F Tightening Torques for Plug-in Unions, MS Unions, Plug-in Check Valves (the Two Parts Made of Steel)
F Tightening Torques for Plug-in Unions, MS Unions, Plug-in Check Valves (One of the Parts Made of Aluminum Alloy)
F 90° Angle Bulkhead Connection
F Straight Bulkhead Connection
F Tightening Torque Values for Bulkhead Locknuts on all CRES Components
F Tightening Torque Values for Bulkhead Locknuts, One of the Parts Made of Aluminum Alloy
F Tightening Torques for Nuts Installed on Pins
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Flexible Hoses, the Two Parts Made of CRES or Titanium
F Tightening Torques for Clamps
F Tightening Torques for Clamps on Brackets of Laminate and Metal Pipes/Ducts
F Tightening Torques for JANITROL and SDM 250-Type Clamps (V-band clamps)
3. Job Set-up
Subtask 20-21-12-941-050-A
A. Diameter Size Code and Connection Size Code (for flareless tubes)
   (1) General rigid pipe connection
F Rigid Pipe - Typical Connection
     (a) Find the connection size code to get the applicable torque value specified in the paragraph 4.Procedure.
     (b) Relation between the pipe outer diameter (OD) and the connection size code
The pipe outer diameter (OD) is related to the diameter size code of the pipe, which is usually the same as the connection size code.
NOTE: The size code gives the number of sixteenths of an inch of the pipe outer diameter (OD).
For example, if the size code is 08 then the pipe outer diameter (OD) is 8x1/16 inch.
NOTE: The pipe size code can be different to the connection size code, if there is a jump size between the pipe and the connection fitting.
     (c) Relation between the connection (T) thread and the connection size code
The male connection (T) thread gives the connection size code directly.
     (d) Relation between the groove dia (D) and the connection size code
The male groove dia (D) gives the connection size code directly.
   (2) General flexible hose connection
F Flexible Hose - Typical Connection
     (a) Find the connection size code to get the applicable torque value specified in the paragraph 4.Procedure.
     (b) Relation between the connection (T) thread and the connection size code
The male connection (T) thread gives the connection size code directly.
Do not use the hose outer diameter (OD) to find the connection size code.
NOTE: The flexible braid or the fire protection sleeve changes the hose outer diameter (OD).
     (c) Relation between the groove dia (D) and the connection size code
The male groove dia (D) gives the connection size code directly.
Subtask 20-21-12-941-051-A
B. Identification of Materials in Hydraulic Line End-Fittings or Unions
   (1) Hydraulic rigid-pipe end-fittings or unions
     (a) To find the material of the hydraulic rigid-pipe end-fittings or unions:
       1 Do a check of the identification tape applied on the hydraulic rigid pipe to find the hydraulic pressure indication:
  • The high pressure line or
  • The low pressure line (suction or return line).
       2 After you find the type of hydraulic pressure indication, refer to the table to find the material of the hydraulic rigid-pipe end-fittings or unions (refer to the color of the material).
F Identification of Materials in Hydraulic Line End-Fittings or Unions
4. Procedure
Subtask 20-21-12-911-050-A
A. Tightening Torques for Hydraulic Systems
NOTE: Before you torque a component, it is necessary to obey the precautions and procedures given in the Tightening Practices for Hydraulic Connections procedure (Ref. AMM TASK 20-23-11-917-001).
   (1) Tightening torques for AN unions (Flared tube).
F Tightening Torques for AN Unions
   (2) Tightening torques for HARRISON and PERMASWAGE unions
F HARRISON and PERMASWAGE Connection
     (a) Removable steel swaged unions of the HARRISON and PERMASWAGE type and removable MS-type unions (CRES and titanium tubes).
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Caps/Plugs, the Two Parts Made of CRES or Titanium
     (b) Removable aluminum-alloy swaged unions of the HARRISON and PERMASWAGE type and removable MS-type unions (aluminum-alloy tubes).
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
     (c) HARRISON and PERMASWAGE type removable unions with one of the parts (union or tube) made of aluminum alloy.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
   (3) Tightening torques for flexible hoses
F Flexible Hose Connection
     (a) Steel union installed on steel equipment or tube.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Caps/Plugs, the Two Parts Made of CRES or Titanium
     (b) Aluminum-alloy union installed on aluminum-alloy equipment or tube.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
     (c) Union with one of the parts (union or equipment or tube) made of aluminum alloy.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
   (4) Tightening torques for in-line check valves
F In-line Check Valve Connection
     (a) Steel check valves installed on steel or titanium pipes.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Caps/Plugs, the Two Parts Made of CRES or Titanium
     (b) Check valve with one of the parts (union or pipe) made of aluminum alloy.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
   (5) Tightening torques for blanking caps/plugs
     (a) Steel cap/plug installed on a steel component.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Caps/Plugs, the Two Parts Made of CRES or Titanium
     (b) Aluminum-alloy cap/plug installed on an aluminum-alloy component.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
     (c) Cap/plug with one of the parts (cap/plug or component) made of aluminum alloy.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
   (6) Tightening torques for plug-in unions
     (a) For plug-in unions installed only on an equipment item, see "A" from
F Plug-in Union Connection
       1 Steel plug-in unions installed on steel equipment.
F Tightening Torques for Plug-in Unions, MS Unions, Plug-in Check Valves (the Two Parts Made of Steel)
       2 Plug-in unions with one or more of the parts (plug-in union or equipment) made of aluminum alloy.
F Tightening Torques for Plug-in Unions, MS Unions, Plug-in Check Valves (One of the Parts Made of Aluminum Alloy)
     (b) For swivel sleeve nuts connected to the plug-in union, see "B" from
F Plug-in Union Connection
       1 If all parts at the interface with the swivel sleeve nut (nut included) are made of steel.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Caps/Plugs, the Two Parts Made of CRES or Titanium
       2 If one or more of the parts at the interface with the swivel sleeve nut (nut included) is made of aluminum alloy.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
   (7) Tightening torques for plug-in check valves
NOTE: The tightening torque values for plug-in check valves are the same as for plug-in unions. Refer to paragraph (6) from the same AMM sub-task.
   (8) Tightening torques for bulkhead connection locknuts
F 90° Angle Bulkhead Connection
F Straight Bulkhead Connection
     (a) On all components made of CRES.
F Tightening Torque Values for Bulkhead Locknuts on all CRES Components
     (b) On all components made of aluminum alloy.
F Tightening Torque Values for Bulkhead Locknuts, One of the Parts Made of Aluminum Alloy
     (c) If one component is made of aluminum alloy.
F Tightening Torque Values for Bulkhead Locknuts, One of the Parts Made of Aluminum Alloy
Subtask 20-21-12-911-052-A
B. Tightening Torques for Fuel Systems
   (1) Tightening torques for nuts used on component studs.
F Tightening Torques for Nuts Installed on Pins
   (2) Tightening torques for ABS 0106 and ABS 0107:
  • Tighten with your hand until the nut touches the pipe end.
   (3) Tightening torques for aluminum alloy unions used on aluminum alloy tubes.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
Subtask 20-21-12-911-053-A
C. Tightening Torques for De-icing Systems
   (1) Tightening torques for removable HARRISON and PERMASWAGE swaged unions and removable MS-type union used on CRES or titanium tubes.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Flexible Hoses, the Two Parts Made of CRES or Titanium
   (2) Hydraulic-type installation with HARRISON unions.
Aluminum-alloy tube and union.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
Subtask 20-21-12-911-054-A
D. Tightening Torques for Rain Protection Systems
   (1) Hydraulic-type installation with HARRISON unions.
Aluminum-alloy tube and union.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
   (2) Hydraulic-type installation with HARRISON unions.
Titanium tube and union.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Flexible Hoses, the Two Parts Made of CRES or Titanium
Subtask 20-21-12-911-055-A
E. Tightening Torques for Fire Extinguishing Systems
   (1) Tightening torques for the hydraulic-type aluminum-alloy unions used on the aluminum-alloy tubes.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
   (2) Tightening torques for the hydraulic-type CRES unions used on the CRES tubes.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Flexible Hoses, the Two Parts Made of CRES or Titanium
Subtask 20-21-12-911-056-A
F. Tightening Torques for Pressurization Systems
   (1) Tightening torques for hydraulic-type aluminum-alloy unions used on aluminum-alloy tubes.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
   (2) Tightening torques for hydraulic-type CRES unions used on CRES tubes.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Flexible Hoses, the Two Parts Made of CRES or Titanium
Subtask 20-21-12-911-057-A
G. Tightening Torques for Air Conditioning Systems
   (1) Tightening torques for clamps used on flexible sleeves between composite or metal pipes/ducts.
F Tightening Torques for Clamps
   (2) Tightening torques for clamps that attach composite or metal pipes/ducts to their supports.
F Tightening Torques for Clamps on Brackets of Laminate and Metal Pipes/Ducts
   (3) Tightening torques for clamps of collars, JANITROL and SDM250-type clamps (V-band clamp).
F Tightening Torques for JANITROL and SDM 250-Type Clamps (V-band clamps)
Subtask 20-21-12-911-058-A
H. Tightening Torques for Water Systems
   (1) Tightening torques for hydraulic-type CRES unions used on CRES tubes.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Flexible Hoses, the Two Parts Made of CRES or Titanium
Subtask 20-21-12-911-059-A
I. Tightening Torques for Waste Water Systems
   (1) Tightening torques for clamps installed on CRES tubes.
F Tightening Torques for Clamps
Subtask 20-21-12-911-060-A
J. Tightening Torques for Air Data Systems
   (1) Hydraulic-type installation with HARRISON unions.
Aluminum-alloy tube and union.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
   (2) Hydraulic-type installation with HARRISON unions.
Titanium tube and union.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Flexible Hoses, the Two Parts Made of CRES or Titanium
Subtask 20-21-12-911-061-A
K. Tightening Torques for IGGS
   (1) Nitrogen Enriched Air (NEA) aluminum-alloy tube and union downstream of the IGGS pallet.
F Tightening Torques for HARRISON and PERMASWAGE In-line Couplings, Check Valves, Flexible Hoses, Fuel Unions, Cap/Plugs, One Part Made of Aluminum Alloy
   (2) Tightening torques for nuts used on component studs.
F Tightening Torques for Nuts Installed on Pins
[Rev.10 from 2021] 2026.04.01 04:47:25 UTC
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