TM 5-3895-374-24-2 INSTALLATION Roots   UNIVERSAL   RAI®   blowers   are   internally   and externally  treated  after  factory  assembly  to   protect   against normal  atmospheric  corrosion  before  installation.    Maximum period of internal protection is considered to be one year under average conditions, if closing plugs or seals are not removed. Protection  against  chemical  or  salt  water  atmosphere  is  not provided.      Avoid   opening   the   blower   until   ready   to   start installation.  as protection will be lost quickly by evaporation. NOTE-If  there  is  to  be  an  extended  period  between delivery   (and/or   installation)   and   startup,   the   following steps should be taken to insure corrosion protection: 1. Coat internals of cylinder and gearbox with Nox-Rust No. VCI10 or equivalent.  Repeat once a year or as conditions may require.  Motorstor is oil soluble and does not have to be removed before lubricating.  If desired, No.  VCI10 may be removed from within the cylinder shortly before startup by  spraying  a  fine  mist  of  petroleum  solvent  through  the blower while it is running at a slow speed with open inlet and  discharge,  or  it  can  remain  in  the  blower  if  it  is  not harmful to the operation of the connected system. 2. Fill drive end bearing cavities with grease as specified in Lubrication section. 3. Paint shaft extension, inlet and discharge flanges, and all other     exposed     surfaces     with     Nox-Rust     X-110     or equivalent. 4. Seal inlet, discharge, and all vent openings with tape.  It is not recommended that the unit be set in place.  piped to the   system,   and   allowed   to   remain   idle   for   extended periods.    If  any  part  is  left  open  to  the  atmosphere,  the Motorstor vapor will escape and lose its effectiveness. 5. Units are not to be subjected to excessive vibration during storage.  If stored outdoors, provide coverage such as  a tarpaulin or lean-to. 6. Rotate   drive   shaft   three   or   four   revolutions   every   two weeks. 7. Prior  to  startup,  remove  flange  covers  on  both  inlet  and discharge and inspect internals to insure absence of rust. Check all internal clearances.  Also.  at this time.  remove gearbox and inspect gear teeth for rust. Because   of   the   completely   enclosed   blower   design, location of the installation is generally not a critical matter.  A clean,  dry  and  protected  indoor  location  is  to  be  preferred. However.      an   outdoor   or   wet   location   will   normally   give satisfactory   service.      Important   requirements   are   that   the correct   grade   of   lubricating   oil   be   provided   for   expected temperatures,  and  that  the  blower  be  located  so  that  routine checking   and   servicing   can   be   handled   conveniently   after installation.    Effect  of  the  location  on  driver  and  accessory equipment must also be considered. Supervision   of   the   installation   by   a   Factory   Service Engineer is not usually required for these blowers.  Workmen with  experience  in  installing  light-medium  weight  machinery should be able to produce satisfactory results.  Handling of the equipment   needs   to   be   accomplished   with   care,   and   in compliance  with  safe  practices.    Blower  mounting  must  be solid,  without  strain  or  twist,  and  air  piping  must  be  clean. accurately aligned and properly connected. A  bare  blower  without  base  should  be  lifted  by  a  rope sling,  with  one  loop  passing  under  the  gearhouse  and  the other loop under the cylinder. When a blower is furnished mounted on a baseplate.  with or without a driver, use of lifting slings passing under the base flanges is required.  Arrange these slings so that no strains are placed   on   the   blower   casing   or   mounting   feet,   or   on   any mounted accessory equipment. Before starting the installation, remove plugs, covers or seals from  blower  inlet  and  discharge  connections  and  inspect  the interior  completely  for  dirt  or  foreign  material.    If  cleaning  is required,   finish   by   washing   the   cylinder,   headplates   and impeller thoroughly with a petroleum solvent such  as  DuPont Triclene  D.    After  this,  turn  the  drive  shaft  by  hand  to  make sure   that   the   impellers   turn   freely   at   all   points.      Anti-rust compound on the drive shaft extension may also be removed at  this  time  with  the  same  solvent.    Then  plug  the  inlet  and discharge connections to keep  out  dirt  until  ready  to  connect the  air  piping.    Washing  out  is  not  required  if  the  interior  is found to be clean.  The  corrosion  inhibitor  used  will  vaporize and disappear during operation. Care, plus consideration of all possible problems, will pay dividends   when   arranging   the   blower   mounting.      This   is especially  true  when  the  blower  is  a  "bare"   unit   furnished without  a  baseplate.    The  convenient  procedure  may  be  to mount  such  a  unit  directly  on  a  floor  or  small  concrete  pad. but   this   generally   produces   least   satisfactory   results.      It definitely causes the most problems in leveling and alignment. Direct  use  of  structural  framing  members  is  also  not  a recommended  mounting.    If  unavoidable,  the  members  must be  rigidly  reinforced  when  part  of  a  building,  and  spring  type mountings   should   not   be   used.      Noise   transmission   can usually  be  reduced  by  use  of  a  cork  insulating  pad  1  to  2 inches (25 to 50 mm) thickness.  The pad should be supported by  a  full  steel  plate  attached  to  the  structure,  with  a  rigid concrete slab  laid  on  top  of  the  cork  to  carry  the  blower  and driver. For a blower without base, it is recommended that a well anchored  and  carefully  leveled  steel  or  cast  iron  mounting plate be provided at the installation point.  The plate should be 3,  4  to  1¼,  inches  119  to  32  mm)  thick,  with  its  top  surface machined   flat,   and   needs   to   be   large   enough   to   provide leveling  areas  at  one  side  and  one  end  after  the  blower  is mounted.  It should have properly sized studs or tapped holes located  to  match  the  blower  foot  drilling.    As  an  alternative, smaller plates at each end of the blower may be used.  This is more complicated.  usually makes leveling more difficult, and can  produce  twist  or  strains  in  the  blower.    Use  of  a  high quality machinist's level is important.  With the mounting plate in place and leveled,  set  the  blower  on  it  without  bolting  and check   for   rocking.      If   it   is   not   solid,   determine   the   total thickness of shims required under one foot to stop the rocking. Place half of this under each of the two short feet, and tighten the mounting studs or screws.  Rotate the drive shaft to make sure the impellers still turn freely.  If the blower is to page 3-804