Answer by  
                                                                                          ScooterMike (145)
                                                            
                          
                          
                                                          Start by using penetrating oil on all the threads. It's a good idea to have two pipe wrenches for unions. Sometimes the oil won't work, so  it's helpful to heat the fittings with a propane torch. Last, you can cut the pipes being sure to use a metal cutting blade.