setelah pipa utama sudah muncul di

setelah pipa utama sudah muncul di seberang jalur, maka permukaan pipa yang kotor dibersihkan terlebih dahulu.

Hasil (Inggris) 1:

After the main pipeline has emerged across the line, then a dirty pipe surface cleaned first.

Hasil (Inggris) 2:

after the main pipe has appeared across the stripe, the surface of the pipe is dirty cleaned first.